SEC Info - Core-Mark Holding Company, Inc. - ‘10-K’ for 12/31/19

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Core-Mark Holding Company, Inc. – ‘10-K’ for 12/31/19 – ‘EX-101.LAB’

On: Monday, 3/2/20, at 6:13am ET · For: 12/31/19 · Accession #: 1318084-20-16 · File #: 0-51515

  As Of               Filer                 Filing    For·On·As Docs:Size

 3/02/20  Core-Mark Holding Company, Inc.   10-K       12/31/19  109:14M

Annual Report — Form 10-K — Sect. 13 / 15(d) – SEA’34
Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 10-K        Annual Report                                       HTML   1.94M 
 2: EX-21.1     Subsidiaries List                                   HTML     30K 
 3: EX-23.1     Consent of Experts or Counsel                       HTML     30K 
 4: EX-31.1     Certification -- §302 - SOA'02                      HTML     38K 
 5: EX-31.2     Certification -- §302 - SOA'02                      HTML     38K 
 6: EX-32.1     Certification -- §906 - SOA'02                      HTML     33K 
 7: EX-32.2     Certification -- §906 - SOA'02                      HTML     33K 
17: R1          Cover                                               HTML     93K 
78: R2          Consolidated Balance Sheets                         HTML    123K 
90: R3          Consolidated Balance Sheets (Parentheticals)        HTML     46K 
53: R4          Consolidated Statements of Operations               HTML    100K 
16: R5          Consolidated Statements of Comprehensive Income     HTML     51K 
77: R6          Consolidated Statements of Stockholders' Equity     HTML     82K 
89: R7          Consolidated Statements of Cash Flows               HTML    144K 
55: R8          Summary of Company Information and Basis of         HTML     36K 
                Presentation                                                     
14: R9          Summary of Significant Accounting Policies          HTML    104K 
35: R10         Acquisitions                                        HTML     63K 
47: R11         Other Consolidated Balance Sheet Accounts Detail    HTML     93K 
109: R12         Inventories, Net                                    HTML     42K  
75: R13         Property and Equipment, Net                         HTML     48K 
34: R14         Leases                                              HTML    199K 
46: R15         Goodwill and Other Intangible Assets, Net           HTML     75K 
108: R16         Long-term Debt                                      HTML     62K  
74: R17         Commitments and Contingencies                       HTML     38K 
33: R18         Income Taxes                                        HTML    164K 
48: R19         Employee Benefit Plans                              HTML     41K 
87: R20         Earnings Per Share                                  HTML     55K 
80: R21         Stock Incentive Plans                               HTML    171K 
15: R22         Stockholders' Equity                                HTML     63K 
56: R23         Other Comprehensive Income (Loss)                   HTML    114K 
86: R24         Segment and Geographic Information                  HTML    130K 
79: R25         Quarterly Financial Data (Unaudited)                HTML    194K 
13: R26         Schedule II - Valuation and Qualifying Accounts     HTML     91K 
54: R27         Summary of Significant Accounting Policies          HTML    163K 
                (Policies)                                                       
88: R28         Summary of Significant Accounting Policies          HTML     91K 
                (Tables)                                                         
76: R29         Acquisitions (Tables)                               HTML     62K 
71: R30         Other Consolidated Balance Sheet Accounts Detail    HTML     99K 
                (Tables)                                                         
106: R31         Inventories, Net (Tables)                           HTML     40K  
50: R32         Property and Equipment (Tables)                     HTML     50K 
36: R33         Leases (Tables)                                     HTML    144K 
72: R34         Goodwill and Other Intangible Assets, Net (Tables)  HTML     78K 
107: R35         Long-term Debt (Tables)                             HTML     64K  
51: R36         Income Taxes (Tables)                               HTML    167K 
37: R37         Earnings Per Share (Tables)                         HTML     56K 
73: R38         Stock Incentive Plans (Tables)                      HTML    170K 
105: R39         Stockholders' Equity (Tables)                       HTML     59K  
83: R40         Other Comprehensive Income (Loss) (Tables)          HTML    116K 
95: R41         Segment and Geographic Information (Tables)         HTML    133K 
57: R42         Quarterly Financial Data (Unaudited) (Tables)       HTML    194K 
18: R43         Summary of Company Information and Basis of         HTML     36K 
                Presentation (Details)                                           
84: R44         Summary of Significant Accounting Policies -        HTML     43K 
                Revenue Recognition, Vendor Rebates and                          
                Promotional Allowances, and Excise Taxes (Details)               
96: R45         Summary of Significant Accounting Policies -        HTML     31K 
                Share-based Compensation (Details)                               
58: R46         Summary of Significant Accounting Policies -        HTML     32K 
                Pension and Other Post-retirement Benefit Costs                  
                (Details)                                                        
19: R47         Summary of Significant Accounting Policies - Cash   HTML     32K 
                Cash Equivalents, Restricted Cash and Book                       
                Overdrafts (Details)                                             
85: R48         Summary of Significant Accounting Policies -        HTML     31K 
                Inventories (Details)                                            
94: R49         Summary of Significant Accounting Policies -        HTML     48K 
                Property and Equipment (Details)                                 
103: R50         Summary of Significant Accounting Policies - Other  HTML     61K  
                Long-lived Assets, Goodwill, and Computer Software               
                Developed or Obtained for Internal Use (Details)                 
70: R51         Summary of Significant Accounting Policies - Debt   HTML     65K 
                Issuance Costs, Claims Liabilities and Insurance                 
                Recoverables, and Risks and Concentrations                       
                (Details)                                                        
25: R52         Summary of Significant Accounting Policies -        HTML     39K 
                Recent Accounting Standards or Updates Not Yet                   
                Effective (Details)                                              
39: R53         Acquisitions - Narrative (Details)                  HTML     60K 
102: R54         Acquisitions - Assets Acquired and Liabilities      HTML     60K  
                Assumed (Details)                                                
69: R55         Acquisitions - Intangible Assets Acquired           HTML     56K 
                (Details)                                                        
24: R56         Acquisitions - Pro Forma Information (Details)      HTML     38K 
38: R57         Other Consolidated Balance Sheet Accounts Detail    HTML     96K 
                (Details)                                                        
104: R58         Inventories, Net (Details)                          HTML     50K  
68: R59         Property and Equipment, Net (Details)               HTML     67K 
22: R60         Leases - Narrative (Details)                        HTML     35K 
60: R61         Leases - Schedule of Assets and Liabilities         HTML     48K 
                (Details)                                                        
92: R62         Leases - Schedule of Lease Cost (Details)           HTML     76K 
82: R63         Leases - Schedule of Maturity of Lease Liabilities  HTML     85K 
                - After Adoption of 842 (Details)                                
21: R64         Leases - Schedule of Maturity of Lease Liabilities  HTML     80K 
                - Before Adoption of 842 (Details)                               
59: R65         Goodwill and Other Intangible Assets, Net -         HTML     48K 
                Narrative (Details)                                              
91: R66         Goodwill and Other Intangible Assets, Net -         HTML     65K 
                Intangible Assets (Details)                                      
81: R67         Long-term Debt - Schedule of Long-term Debt         HTML     68K 
                (Details)                                                        
20: R68         Long-term Debt - Narrative (Details)                HTML     34K 
62: R69         Commitments and Contingencies (Details)             HTML     34K 
43: R70         Income Taxes - Income Tax Provisions (Details)      HTML     65K 
27: R71         Income Taxes - Effective Income Tax Rate            HTML    120K 
                Reconciliation (Details)                                         
65: R72         Income Taxes - Narrative (Details)                  HTML     44K 
98: R73         Income Taxes - Deferred Tax Assets and Liabilities  HTML     83K 
                (Details)                                                        
44: R74         Income Taxes - Unrecognized Tax Benefits (Details)  HTML     35K 
28: R75         Employee Benefit Plans (Details)                    HTML     71K 
66: R76         Earnings Per Share (Details)                        HTML     69K 
99: R77         Stock Incentive Plans - Narrative (Details)         HTML     65K 
41: R78         Stock Incentive Plans - Securities To Be Issued     HTML     45K 
                and Remaining Available For Future Issuance                      
                (Details)                                                        
32: R79         Stock Incentive Plans - Share-Based Compensation    HTML    114K 
                Activity (Details)                                               
42: R80         Stock Incentive Plans - Securities Vested and       HTML     64K 
                Expected to Vest (Details)                                       
26: R81         Stock Incentive Plans - Aggregate Intrinsic Value   HTML     36K 
                of Awards Vested and Exercised (Details)                         
64: R82         Stock Incentive Plans - Fair Value Assumptions      HTML     46K 
                (Details)                                                        
97: R83         Stockholders' Equity - Additional Information       HTML     64K 
                (Details)                                                        
45: R84         Stockholders' Equity - Dividends (Details)          HTML     36K 
29: R85         Other Comprehensive Income (Loss) - Components of   HTML     72K 
                OCI (Details)                                                    
67: R86         Other Comprehensive Income (Loss) - Summary of      HTML     47K 
                Changes in AOCI (Details)                                        
100: R87         Segment and Geographic Information - Narrative      HTML     35K  
                (Details)                                                        
40: R88         Segment and Geographic Information - Geographic     HTML     69K 
                Reporting Segments (Details)                                     
30: R89         Segment and Geographic Information - Identifiable   HTML     37K 
                Assets (Details)                                                 
23: R90         Segment and Geographic Information - Net Sales By   HTML     62K 
                Product Categories (Details)                                     
61: R91         Quarterly Financial Data (Unaudited) (Details)      HTML    128K 
93: R92         Schedule II - Valuation and Qualifying Accounts     HTML     47K 
                (Details)                                                        
52: XML         IDEA XML File -- Filing Summary                      XML    200K 
101: XML         XBRL Instance -- a10-k2019document_htm               XML   3.84M  
49: EXCEL       IDEA Workbook of Financial Reports                  XLSX    125K 
 9: EX-101.CAL  XBRL Calculations -- core-20191231_cal               XML    404K 
10: EX-101.DEF  XBRL Definitions -- core-20191231_def                XML    811K 
11: EX-101.LAB  XBRL Labels -- core-20191231_lab                     XML   2.24M 
12: EX-101.PRE  XBRL Presentations -- core-20191231_pre              XML   1.36M 
 8: EX-101.SCH  XBRL Schema -- core-20191231                         XSD    236K 
63: JSON        XBRL Instance as JSON Data -- MetaLinks              479±   718K 
31: ZIP         XBRL Zipped Folder -- 0001318084-20-000016-xbrl      Zip    554K

‘EX-101.LAB’ — XBRL Labels — core-20191231_lab

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<link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_A09A36BB15D597F3F5FF75B59A5440F3_terseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_A09A36BB15D597F3F5FF75B59A5440F3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accumulated Other Comprehensive Income (Loss) [Line Items] </link:label>

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<link:label id="lab_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent_5545221680C11994982275B59A55C742_totalLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent_5545221680C11994982275B59A55C742" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Other comprehensive income (loss), before tax </link:label>

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<link:label id="lab_us-gaap_StatementOfFinancialPositionAbstract_D08E88456CD7EBEF982B75B59C207BD8_label_en-US" xlink:label="lab_us-gaap_StatementOfFinancialPositionAbstract_D08E88456CD7EBEF982B75B59C207BD8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Statement of Financial Position [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementOfFinancialPositionAbstract" xlink:label="loc_us-gaap_StatementOfFinancialPositionAbstract_D08E88456CD7EBEF982B75B59C207BD8" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementOfFinancialPositionAbstract_D08E88456CD7EBEF982B75B59C207BD8" xlink:to="lab_us-gaap_StatementOfFinancialPositionAbstract_D08E88456CD7EBEF982B75B59C207BD8" xlink:type="arc"/>

<link:label id="lab_us-gaap_AssetsCurrentAbstract_10337D3EE3DCA5A3164675B59C203C62_terseLabel_en-US" xlink:label="lab_us-gaap_AssetsCurrentAbstract_10337D3EE3DCA5A3164675B59C203C62" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Current assets: </link:label>

<link:label id="lab_us-gaap_AssetsCurrentAbstract_10337D3EE3DCA5A3164675B59C203C62_label_en-US" xlink:label="lab_us-gaap_AssetsCurrentAbstract_10337D3EE3DCA5A3164675B59C203C62" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Assets, Current [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="loc_us-gaap_AssetsCurrentAbstract_10337D3EE3DCA5A3164675B59C203C62" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetsCurrentAbstract_10337D3EE3DCA5A3164675B59C203C62" xlink:to="lab_us-gaap_AssetsCurrentAbstract_10337D3EE3DCA5A3164675B59C203C62" xlink:type="arc"/>

<link:label id="lab_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_CB1C563C38D95665839B75B59C20A679_terseLabel_en-US" xlink:label="lab_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_CB1C563C38D95665839B75B59C20A679" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Allowance for doubtful accounts </link:label>

<link:label id="lab_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_CB1C563C38D95665839B75B59C20A679_label_en-US" xlink:label="lab_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_CB1C563C38D95665839B75B59C20A679" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accounts Receivable, Allowance for Credit Loss, Current </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_CB1C563C38D95665839B75B59C20A679" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_CB1C563C38D95665839B75B59C20A679" xlink:to="lab_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_CB1C563C38D95665839B75B59C20A679" xlink:type="arc"/>

<link:label id="lab_us-gaap_StockholdersEquityAbstract_09E50B2588A5733E324775B59C2100EA_terseLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquityAbstract_09E50B2588A5733E324775B59C2100EA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Stockholders’ equity (Note 15): </link:label>

<link:label id="lab_us-gaap_StockholdersEquityAbstract_09E50B2588A5733E324775B59C2100EA_label_en-US" xlink:label="lab_us-gaap_StockholdersEquityAbstract_09E50B2588A5733E324775B59C2100EA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Stockholders' Equity Attributable to Parent [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquityAbstract" xlink:label="loc_us-gaap_StockholdersEquityAbstract_09E50B2588A5733E324775B59C2100EA" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockholdersEquityAbstract_09E50B2588A5733E324775B59C2100EA" xlink:to="lab_us-gaap_StockholdersEquityAbstract_09E50B2588A5733E324775B59C2100EA" xlink:type="arc"/>

<link:label id="lab_us-gaap_CommonStockParOrStatedValuePerShare_8B70943BBB674838031C75B59C21A5D9_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockParOrStatedValuePerShare_8B70943BBB674838031C75B59C21A5D9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Common stock, par value per share (in dollars per share) </link:label>

<link:label id="lab_us-gaap_CommonStockParOrStatedValuePerShare_8B70943BBB674838031C75B59C21A5D9_label_en-US" xlink:label="lab_us-gaap_CommonStockParOrStatedValuePerShare_8B70943BBB674838031C75B59C21A5D9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Common Stock, Par or Stated Value Per Share </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_8B70943BBB674838031C75B59C21A5D9" xlink:type="locator"/>

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<link:label id="lab_us-gaap_CommonStockSharesAuthorized_6F52D664E34BA54F733075B59C21DDDC_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockSharesAuthorized_6F52D664E34BA54F733075B59C21DDDC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Common stock, shares authorized (in shares) </link:label>

<link:label id="lab_us-gaap_CommonStockSharesAuthorized_6F52D664E34BA54F733075B59C21DDDC_label_en-US" xlink:label="lab_us-gaap_CommonStockSharesAuthorized_6F52D664E34BA54F733075B59C21DDDC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Common Stock, Shares Authorized </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockSharesAuthorized" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_6F52D664E34BA54F733075B59C21DDDC" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommonStockSharesAuthorized_6F52D664E34BA54F733075B59C21DDDC" xlink:to="lab_us-gaap_CommonStockSharesAuthorized_6F52D664E34BA54F733075B59C21DDDC" xlink:type="arc"/>

<link:label id="lab_us-gaap_CommonStockSharesIssued_B270F07320CBD35BCEF375B59C21977D_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockSharesIssued_B270F07320CBD35BCEF375B59C21977D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Common stock, shares issued (in shares) </link:label>

<link:label id="lab_us-gaap_CommonStockSharesIssued_B270F07320CBD35BCEF375B59C21977D_label_en-US" xlink:label="lab_us-gaap_CommonStockSharesIssued_B270F07320CBD35BCEF375B59C21977D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Common Stock, Shares, Issued </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockSharesIssued" xlink:label="loc_us-gaap_CommonStockSharesIssued_B270F07320CBD35BCEF375B59C21977D" xlink:type="locator"/>

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<link:label id="lab_us-gaap_CommonStockSharesOutstanding_5BFCCB81EFD1FC18C98175B59C21038D_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockSharesOutstanding_5BFCCB81EFD1FC18C98175B59C21038D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Common stock, shares outstanding (in shares) </link:label>

<link:label id="lab_us-gaap_CommonStockSharesOutstanding_5BFCCB81EFD1FC18C98175B59C21038D_label_en-US" xlink:label="lab_us-gaap_CommonStockSharesOutstanding_5BFCCB81EFD1FC18C98175B59C21038D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Common Stock, Shares, Outstanding </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_5BFCCB81EFD1FC18C98175B59C21038D" xlink:type="locator"/>

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<link:label id="lab_us-gaap_TreasuryStockShares_7BA3AFEA15F3C35355AB75B59C226849_terseLabel_en-US" xlink:label="lab_us-gaap_TreasuryStockShares_7BA3AFEA15F3C35355AB75B59C226849" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Treasury stock, shares (in shares) </link:label>

<link:label id="lab_us-gaap_TreasuryStockShares_7BA3AFEA15F3C35355AB75B59C226849_label_en-US" xlink:label="lab_us-gaap_TreasuryStockShares_7BA3AFEA15F3C35355AB75B59C226849" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Treasury Stock, Shares </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TreasuryStockShares" xlink:label="loc_us-gaap_TreasuryStockShares_7BA3AFEA15F3C35355AB75B59C226849" xlink:type="locator"/>

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<link:label id="lab_us-gaap_LeasesAbstract_8ADC19629FAA8AA71C2B75B59B41583C_label_en-US" xlink:label="lab_us-gaap_LeasesAbstract_8ADC19629FAA8AA71C2B75B59B41583C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Leases [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LeasesAbstract" xlink:label="loc_us-gaap_LeasesAbstract_8ADC19629FAA8AA71C2B75B59B41583C" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LeasesAbstract_8ADC19629FAA8AA71C2B75B59B41583C" xlink:to="lab_us-gaap_LeasesAbstract_8ADC19629FAA8AA71C2B75B59B41583C" xlink:type="arc"/>

<link:label id="lab_us-gaap_AssetsAbstract_469432E31C32FE91328D75B59B41C382_terseLabel_en-US" xlink:label="lab_us-gaap_AssetsAbstract_469432E31C32FE91328D75B59B41C382" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Assets </link:label>

<link:label id="lab_us-gaap_AssetsAbstract_469432E31C32FE91328D75B59B41C382_label_en-US" xlink:label="lab_us-gaap_AssetsAbstract_469432E31C32FE91328D75B59B41C382" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Assets [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="loc_us-gaap_AssetsAbstract_469432E31C32FE91328D75B59B41C382" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetsAbstract_469432E31C32FE91328D75B59B41C382" xlink:to="lab_us-gaap_AssetsAbstract_469432E31C32FE91328D75B59B41C382" xlink:type="arc"/>

<link:label id="lab_us-gaap_OperatingLeaseRightOfUseAsset_822CE65D8E3505800F6875B59B412F1E_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseRightOfUseAsset_822CE65D8E3505800F6875B59B412F1E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Operating lease right-of-use assets </link:label>

<link:label id="lab_us-gaap_OperatingLeaseRightOfUseAsset_822CE65D8E3505800F6875B59B412F1E_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseRightOfUseAsset_822CE65D8E3505800F6875B59B412F1E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Lease, Right-of-Use Asset </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_822CE65D8E3505800F6875B59B412F1E" xlink:type="locator"/>

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<link:label id="lab_us-gaap_FinanceLeaseRightOfUseAsset_78EDB63A33737EA0400C75B59B41DAFE_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseRightOfUseAsset_78EDB63A33737EA0400C75B59B41DAFE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Property and equipment, net </link:label>

<link:label id="lab_us-gaap_FinanceLeaseRightOfUseAsset_78EDB63A33737EA0400C75B59B41DAFE_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseRightOfUseAsset_78EDB63A33737EA0400C75B59B41DAFE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finance Lease, Right-of-Use Asset </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseRightOfUseAsset" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAsset_78EDB63A33737EA0400C75B59B41DAFE" xlink:type="locator"/>

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<link:label id="lab_core_LeaseRightOfUseAsset_C9C9D8ECEF988D3C063B75B59B42AFA1_totalLabel_en-US" xlink:label="lab_core_LeaseRightOfUseAsset_C9C9D8ECEF988D3C063B75B59B42AFA1" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total leases </link:label>

<link:label id="lab_core_LeaseRightOfUseAsset_C9C9D8ECEF988D3C063B75B59B42AFA1_label_en-US" xlink:label="lab_core_LeaseRightOfUseAsset_C9C9D8ECEF988D3C063B75B59B42AFA1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lease, Right-Of-Use Asset </link:label>

<link:label id="lab_core_LeaseRightOfUseAsset_C9C9D8ECEF988D3C063B75B59B42AFA1_documentation_en-US" xlink:label="lab_core_LeaseRightOfUseAsset_C9C9D8ECEF988D3C063B75B59B42AFA1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Lease, Right-Of-Use Asset </link:label>

<link:loc xlink:href="core-20191231.xsd#core_LeaseRightOfUseAsset" xlink:label="loc_core_LeaseRightOfUseAsset_C9C9D8ECEF988D3C063B75B59B42AFA1" xlink:type="locator"/>

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<link:label id="lab_us-gaap_LiabilitiesAbstract_C92C571E89532CF3A48475B59B42E047_terseLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesAbstract_C92C571E89532CF3A48475B59B42E047" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Liabilities </link:label>

<link:label id="lab_us-gaap_LiabilitiesAbstract_C92C571E89532CF3A48475B59B42E047_label_en-US" xlink:label="lab_us-gaap_LiabilitiesAbstract_C92C571E89532CF3A48475B59B42E047" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Liabilities [Abstract] </link:label>

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<link:label id="lab_us-gaap_LiabilitiesCurrentAbstract_DE9F1FAC42C39F28C57675B59B42E33A_label_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrentAbstract_DE9F1FAC42C39F28C57675B59B42E33A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Liabilities, Current [Abstract] </link:label>

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<link:label id="lab_us-gaap_OperatingLeaseLiabilityCurrent_5F4D19B6CA1EE91A653675B59B426B5B_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilityCurrent_5F4D19B6CA1EE91A653675B59B426B5B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Lease, Liability, Current </link:label>

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<link:label id="lab_us-gaap_FinanceLeaseLiabilityCurrent_2FAE95E64CEEE27B56AF75B59B43F6FD_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityCurrent_2FAE95E64CEEE27B56AF75B59B43F6FD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finance Lease, Liability, Current </link:label>

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<link:label id="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_FDF0EA7F7E99A360F91E75B59B437BE9_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_FDF0EA7F7E99A360F91E75B59B437BE9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Long-term operating lease liabilities </link:label>

<link:label id="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_FDF0EA7F7E99A360F91E75B59B437BE9_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_FDF0EA7F7E99A360F91E75B59B437BE9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Lease, Liability, Noncurrent </link:label>

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<link:label id="lab_us-gaap_FinanceLeaseLiabilityNoncurrent_87CC196C66F3DDECA59075B59B43444A_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityNoncurrent_87CC196C66F3DDECA59075B59B43444A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finance Lease, Liability, Noncurrent </link:label>

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<link:label id="lab_core_LeaseLiability_38883F2DD0F41000797275B59B4333B0_totalLabel_en-US" xlink:label="lab_core_LeaseLiability_38883F2DD0F41000797275B59B4333B0" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Present value of lease liabilities </link:label>

<link:label id="lab_core_LeaseLiability_38883F2DD0F41000797275B59B4333B0_label_en-US" xlink:label="lab_core_LeaseLiability_38883F2DD0F41000797275B59B4333B0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lease, Liability </link:label>

<link:label id="lab_core_LeaseLiability_38883F2DD0F41000797275B59B4333B0_documentation_en-US" xlink:label="lab_core_LeaseLiability_38883F2DD0F41000797275B59B4333B0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Lease, Liability </link:label>

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<link:label id="lab_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_D68C676BCD4A60AA984F75B59A6EE917_label_en-US" xlink:label="lab_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_D68C676BCD4A60AA984F75B59A6EE917" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Payment Arrangement [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_D68C676BCD4A60AA984F75B59A6EE917" xlink:type="locator"/>

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<link:label id="lab_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_34AE3B7A60BE163187B275B59A6E52C4_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_34AE3B7A60BE163187B275B59A6E52C4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] </link:label>

<link:label id="lab_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_34AE3B7A60BE163187B275B59A6E52C4_label_en-US" xlink:label="lab_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_34AE3B7A60BE163187B275B59A6E52C4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_34AE3B7A60BE163187B275B59A6E52C4" xlink:type="locator"/>

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<link:label id="lab_us-gaap_PlanNameAxis_076D38FC5845FAF5C6E375B59A6FFCD3_terseLabel_en-US" xlink:label="lab_us-gaap_PlanNameAxis_076D38FC5845FAF5C6E375B59A6FFCD3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Plan Name [Axis] </link:label>

<link:label id="lab_us-gaap_PlanNameAxis_076D38FC5845FAF5C6E375B59A6FFCD3_label_en-US" xlink:label="lab_us-gaap_PlanNameAxis_076D38FC5845FAF5C6E375B59A6FFCD3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Plan Name [Axis] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaap_PlanNameAxis_076D38FC5845FAF5C6E375B59A6FFCD3" xlink:type="locator"/>

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<link:label id="lab_us-gaap_PlanNameDomain_5C09D2AFB95E89A865A275B59A6F0E5D_terseLabel_en-US" xlink:label="lab_us-gaap_PlanNameDomain_5C09D2AFB95E89A865A275B59A6F0E5D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Plan Name [Domain] </link:label>

<link:label id="lab_us-gaap_PlanNameDomain_5C09D2AFB95E89A865A275B59A6F0E5D_label_en-US" xlink:label="lab_us-gaap_PlanNameDomain_5C09D2AFB95E89A865A275B59A6F0E5D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Plan Name [Domain] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_5C09D2AFB95E89A865A275B59A6F0E5D" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PlanNameDomain_5C09D2AFB95E89A865A275B59A6F0E5D" xlink:to="lab_us-gaap_PlanNameDomain_5C09D2AFB95E89A865A275B59A6F0E5D" xlink:type="arc"/>

<link:label id="lab_core_A2010LtipMember_8B7BC842E893CE29B97475B59A6FA1F8_terseLabel_en-US" xlink:label="lab_core_A2010LtipMember_8B7BC842E893CE29B97475B59A6FA1F8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2010 LTIP </link:label>

<link:label id="lab_core_A2010LtipMember_8B7BC842E893CE29B97475B59A6FA1F8_label_en-US" xlink:label="lab_core_A2010LtipMember_8B7BC842E893CE29B97475B59A6FA1F8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> 2010 LTIP [Member] </link:label>

<link:label id="lab_core_A2010LtipMember_8B7BC842E893CE29B97475B59A6FA1F8_documentation_en-US" xlink:label="lab_core_A2010LtipMember_8B7BC842E893CE29B97475B59A6FA1F8" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> 2010 LTIP [Member] </link:label>

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<link:label id="lab_us-gaap_AwardTypeAxis_68E7F257BBA4099EF31375B59A6FAD43_terseLabel_en-US" xlink:label="lab_us-gaap_AwardTypeAxis_68E7F257BBA4099EF31375B59A6FAD43" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Award Type [Axis] </link:label>

<link:label id="lab_us-gaap_AwardTypeAxis_68E7F257BBA4099EF31375B59A6FAD43_label_en-US" xlink:label="lab_us-gaap_AwardTypeAxis_68E7F257BBA4099EF31375B59A6FAD43" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Award Type [Axis] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_68E7F257BBA4099EF31375B59A6FAD43" xlink:type="locator"/>

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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_4501C95C139F4FA88BF375B59A702973_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_4501C95C139F4FA88BF375B59A702973" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Award Type [Domain] </link:label>

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<link:label id="lab_us-gaap_RestrictedStockUnitsRSUMember_A2CFC3E10DEF7A0FD2C775B59A70DB69_verboseLabel_en-US" xlink:label="lab_us-gaap_RestrictedStockUnitsRSUMember_A2CFC3E10DEF7A0FD2C775B59A70DB69" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> RSUs </link:label>

<link:label id="lab_us-gaap_RestrictedStockUnitsRSUMember_A2CFC3E10DEF7A0FD2C775B59A70DB69_label_en-US" xlink:label="lab_us-gaap_RestrictedStockUnitsRSUMember_A2CFC3E10DEF7A0FD2C775B59A70DB69" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Restricted Stock Units (RSUs) [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_A2CFC3E10DEF7A0FD2C775B59A70DB69" xlink:type="locator"/>

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<link:label id="lab_us-gaap_PerformanceSharesMember_51AE2CFC828FB90287EC75B59A70A5DC_terseLabel_en-US" xlink:label="lab_us-gaap_PerformanceSharesMember_51AE2CFC828FB90287EC75B59A70A5DC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Performance shares </link:label>

<link:label id="lab_us-gaap_PerformanceSharesMember_51AE2CFC828FB90287EC75B59A70A5DC_label_en-US" xlink:label="lab_us-gaap_PerformanceSharesMember_51AE2CFC828FB90287EC75B59A70A5DC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Performance Shares [Member] </link:label>

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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_352FFB3BC2FC2FF0B84E75B59A7019B1_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_352FFB3BC2FC2FF0B84E75B59A7019B1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award [Line Items] </link:label>

<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_352FFB3BC2FC2FF0B84E75B59A7019B1_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_352FFB3BC2FC2FF0B84E75B59A7019B1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award [Line Items] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_352FFB3BC2FC2FF0B84E75B59A7019B1" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_352FFB3BC2FC2FF0B84E75B59A7019B1" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_352FFB3BC2FC2FF0B84E75B59A7019B1" xlink:type="arc"/>

<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_597B8A1E71BE263276D475B59A70C073_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_597B8A1E71BE263276D475B59A70C073" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Weighted-average fair value per share of grants (in dollars per share) </link:label>

<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_597B8A1E71BE263276D475B59A70C073_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_597B8A1E71BE263276D475B59A70C073" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_597B8A1E71BE263276D475B59A70C073" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_597B8A1E71BE263276D475B59A70C073" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_597B8A1E71BE263276D475B59A70C073" xlink:type="arc"/>

<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted_69789B57EE69EF50617575B59A715592_verboseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted_69789B57EE69EF50617575B59A715592" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Number of shares awarded (in shares) </link:label>

<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted_69789B57EE69EF50617575B59A715592_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted_69789B57EE69EF50617575B59A715592" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted_69789B57EE69EF50617575B59A715592" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted_69789B57EE69EF50617575B59A715592" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted_69789B57EE69EF50617575B59A715592" xlink:type="arc"/>

<link:label id="lab_core_SharebasedCompensationArrangementbySharebasedPaymentAwardTotalOptionsandNonOptionEquityInstrumentsVestedandExercised_1217E85232654CE8A49675B59A710BC1_terseLabel_en-US" xlink:label="lab_core_SharebasedCompensationArrangementbySharebasedPaymentAwardTotalOptionsandNonOptionEquityInstrumentsVestedandExercised_1217E85232654CE8A49675B59A710BC1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Share-based awards earned </link:label>

<link:label id="lab_core_SharebasedCompensationArrangementbySharebasedPaymentAwardTotalOptionsandNonOptionEquityInstrumentsVestedandExercised_1217E85232654CE8A49675B59A710BC1_label_en-US" xlink:label="lab_core_SharebasedCompensationArrangementbySharebasedPaymentAwardTotalOptionsandNonOptionEquityInstrumentsVestedandExercised_1217E85232654CE8A49675B59A710BC1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Total Options and Non-Option Equity Instruments, Vested and Exercised </link:label>

<link:label id="lab_core_SharebasedCompensationArrangementbySharebasedPaymentAwardTotalOptionsandNonOptionEquityInstrumentsVestedandExercised_1217E85232654CE8A49675B59A710BC1_documentation_en-US" xlink:label="lab_core_SharebasedCompensationArrangementbySharebasedPaymentAwardTotalOptionsandNonOptionEquityInstrumentsVestedandExercised_1217E85232654CE8A49675B59A710BC1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Total Options and Non-Option Equity Instruments, Vested and Exercised </link:label>

<link:loc xlink:href="core-20191231.xsd#core_SharebasedCompensationArrangementbySharebasedPaymentAwardTotalOptionsandNonOptionEquityInstrumentsVestedandExercised" xlink:label="loc_core_SharebasedCompensationArrangementbySharebasedPaymentAwardTotalOptionsandNonOptionEquityInstrumentsVestedandExercised_1217E85232654CE8A49675B59A710BC1" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_SharebasedCompensationArrangementbySharebasedPaymentAwardTotalOptionsandNonOptionEquityInstrumentsVestedandExercised_1217E85232654CE8A49675B59A710BC1" xlink:to="lab_core_SharebasedCompensationArrangementbySharebasedPaymentAwardTotalOptionsandNonOptionEquityInstrumentsVestedandExercised_1217E85232654CE8A49675B59A710BC1" xlink:type="arc"/>

<link:label id="lab_us-gaap_IncomeStatementAbstract_2A55785E19A5E045480E8E6A5C52318C_label_en-US" xlink:label="lab_us-gaap_IncomeStatementAbstract_2A55785E19A5E045480E8E6A5C52318C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Income Statement [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementAbstract" xlink:label="loc_us-gaap_IncomeStatementAbstract_2A55785E19A5E045480E8E6A5C52318C" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeStatementAbstract_2A55785E19A5E045480E8E6A5C52318C" xlink:to="lab_us-gaap_IncomeStatementAbstract_2A55785E19A5E045480E8E6A5C52318C" xlink:type="arc"/>

<link:label id="lab_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_CB94D66D2C80B843ACA98E6A5C527297_terseLabel_en-US" xlink:label="lab_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_CB94D66D2C80B843ACA98E6A5C527297" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Net sales </link:label>

<link:label id="lab_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_CB94D66D2C80B843ACA98E6A5C527297_label_en-US" xlink:label="lab_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_CB94D66D2C80B843ACA98E6A5C527297" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Revenue from Contract with Customer, Including Assessed Tax </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_CB94D66D2C80B843ACA98E6A5C527297" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_CB94D66D2C80B843ACA98E6A5C527297" xlink:to="lab_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_CB94D66D2C80B843ACA98E6A5C527297" xlink:type="arc"/>

<link:label id="lab_us-gaap_CostOfGoodsAndServicesSold_379EB72E6680402364AE8E6A5C534A8B_terseLabel_en-US" xlink:label="lab_us-gaap_CostOfGoodsAndServicesSold_379EB72E6680402364AE8E6A5C534A8B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cost of goods sold </link:label>

<link:label id="lab_us-gaap_CostOfGoodsAndServicesSold_379EB72E6680402364AE8E6A5C534A8B_label_en-US" xlink:label="lab_us-gaap_CostOfGoodsAndServicesSold_379EB72E6680402364AE8E6A5C534A8B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cost of Goods and Services Sold </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CostOfGoodsAndServicesSold" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_379EB72E6680402364AE8E6A5C534A8B" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CostOfGoodsAndServicesSold_379EB72E6680402364AE8E6A5C534A8B" xlink:to="lab_us-gaap_CostOfGoodsAndServicesSold_379EB72E6680402364AE8E6A5C534A8B" xlink:type="arc"/>

<link:label id="lab_us-gaap_GrossProfit_2E0DB5A29EA7FF94B07C8E6A5C535AA7_totalLabel_en-US" xlink:label="lab_us-gaap_GrossProfit_2E0DB5A29EA7FF94B07C8E6A5C535AA7" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Gross profit </link:label>

<link:label id="lab_us-gaap_GrossProfit_2E0DB5A29EA7FF94B07C8E6A5C535AA7_label_en-US" xlink:label="lab_us-gaap_GrossProfit_2E0DB5A29EA7FF94B07C8E6A5C535AA7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Gross Profit </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GrossProfit" xlink:label="loc_us-gaap_GrossProfit_2E0DB5A29EA7FF94B07C8E6A5C535AA7" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GrossProfit_2E0DB5A29EA7FF94B07C8E6A5C535AA7" xlink:to="lab_us-gaap_GrossProfit_2E0DB5A29EA7FF94B07C8E6A5C535AA7" xlink:type="arc"/>

<link:label id="lab_core_WarehousingAndDistributionExpenses_49C416BD78BDFDE9A1518E6A5C53888A_terseLabel_en-US" xlink:label="lab_core_WarehousingAndDistributionExpenses_49C416BD78BDFDE9A1518E6A5C53888A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Warehousing and distribution expenses </link:label>

<link:label id="lab_core_WarehousingAndDistributionExpenses_49C416BD78BDFDE9A1518E6A5C53888A_label_en-US" xlink:label="lab_core_WarehousingAndDistributionExpenses_49C416BD78BDFDE9A1518E6A5C53888A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Warehousing and distribution expenses </link:label>

<link:label id="lab_core_WarehousingAndDistributionExpenses_49C416BD78BDFDE9A1518E6A5C53888A_documentation_en-US" xlink:label="lab_core_WarehousingAndDistributionExpenses_49C416BD78BDFDE9A1518E6A5C53888A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> The aggregate total costs related to operating our distribution and warehousing facilities. These costs include delivery and warehouse salaries, fuel, truck and trailer leases, insurance, vehicle repairs and maintenance, facility and storage rent, utilities, depreciation and other related expenses. </link:label>

<link:loc xlink:href="core-20191231.xsd#core_WarehousingAndDistributionExpenses" xlink:label="loc_core_WarehousingAndDistributionExpenses_49C416BD78BDFDE9A1518E6A5C53888A" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_WarehousingAndDistributionExpenses_49C416BD78BDFDE9A1518E6A5C53888A" xlink:to="lab_core_WarehousingAndDistributionExpenses_49C416BD78BDFDE9A1518E6A5C53888A" xlink:type="arc"/>

<link:label id="lab_us-gaap_SellingGeneralAndAdministrativeExpense_8AF64D060DA42E508CD88E6A5C535D68_terseLabel_en-US" xlink:label="lab_us-gaap_SellingGeneralAndAdministrativeExpense_8AF64D060DA42E508CD88E6A5C535D68" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Selling, general and administrative expenses </link:label>

<link:label id="lab_us-gaap_SellingGeneralAndAdministrativeExpense_8AF64D060DA42E508CD88E6A5C535D68_label_en-US" xlink:label="lab_us-gaap_SellingGeneralAndAdministrativeExpense_8AF64D060DA42E508CD88E6A5C535D68" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Selling, General and Administrative Expense </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_8AF64D060DA42E508CD88E6A5C535D68" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SellingGeneralAndAdministrativeExpense_8AF64D060DA42E508CD88E6A5C535D68" xlink:to="lab_us-gaap_SellingGeneralAndAdministrativeExpense_8AF64D060DA42E508CD88E6A5C535D68" xlink:type="arc"/>

<link:label id="lab_us-gaap_AmortizationOfIntangibleAssets_C397D983ECA74539745B8E6A5C53DFD9_terseLabel_en-US" xlink:label="lab_us-gaap_AmortizationOfIntangibleAssets_C397D983ECA74539745B8E6A5C53DFD9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Amortization of intangible assets </link:label>

<link:label id="lab_us-gaap_AmortizationOfIntangibleAssets_C397D983ECA74539745B8E6A5C53DFD9_label_en-US" xlink:label="lab_us-gaap_AmortizationOfIntangibleAssets_C397D983ECA74539745B8E6A5C53DFD9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Amortization of Intangible Assets </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_C397D983ECA74539745B8E6A5C53DFD9" xlink:type="locator"/>

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<link:label id="lab_us-gaap_OperatingExpenses_F9793100F873FB74C8938E6A5C53D8CF_totalLabel_en-US" xlink:label="lab_us-gaap_OperatingExpenses_F9793100F873FB74C8938E6A5C53D8CF" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total operating expenses </link:label>

<link:label id="lab_us-gaap_OperatingExpenses_F9793100F873FB74C8938E6A5C53D8CF_label_en-US" xlink:label="lab_us-gaap_OperatingExpenses_F9793100F873FB74C8938E6A5C53D8CF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Expenses </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingExpenses" xlink:label="loc_us-gaap_OperatingExpenses_F9793100F873FB74C8938E6A5C53D8CF" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingExpenses_F9793100F873FB74C8938E6A5C53D8CF" xlink:to="lab_us-gaap_OperatingExpenses_F9793100F873FB74C8938E6A5C53D8CF" xlink:type="arc"/>

<link:label id="lab_us-gaap_OperatingIncomeLoss_E63736D7FB9AB6C9AD4C8E6A5C5444F9_totalLabel_en-US" xlink:label="lab_us-gaap_OperatingIncomeLoss_E63736D7FB9AB6C9AD4C8E6A5C5444F9" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Income from operations </link:label>

<link:label id="lab_us-gaap_OperatingIncomeLoss_E63736D7FB9AB6C9AD4C8E6A5C5444F9_label_en-US" xlink:label="lab_us-gaap_OperatingIncomeLoss_E63736D7FB9AB6C9AD4C8E6A5C5444F9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Income (Loss) </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_E63736D7FB9AB6C9AD4C8E6A5C5444F9" xlink:type="locator"/>

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<link:label id="lab_us-gaap_InterestExpense_D1BA59EE7E45D05041678E6A5C548E11_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_InterestExpense_D1BA59EE7E45D05041678E6A5C548E11" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Interest expense, net </link:label>

<link:label id="lab_us-gaap_InterestExpense_D1BA59EE7E45D05041678E6A5C548E11_label_en-US" xlink:label="lab_us-gaap_InterestExpense_D1BA59EE7E45D05041678E6A5C548E11" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Interest Expense </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestExpense" xlink:label="loc_us-gaap_InterestExpense_D1BA59EE7E45D05041678E6A5C548E11" xlink:type="locator"/>

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<link:label id="lab_us-gaap_ForeignCurrencyTransactionGainLossRealized_C72B91CECDB995011A6A8E6A5C54B867_terseLabel_en-US" xlink:label="lab_us-gaap_ForeignCurrencyTransactionGainLossRealized_C72B91CECDB995011A6A8E6A5C54B867" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Foreign currency transaction (losses) gains, net </link:label>

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<link:label id="lab_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1_10C2DFAEB85B0506108C8E6A5C5467AC_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1_10C2DFAEB85B0506108C8E6A5C5467AC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Pension termination settlement (Note 12) </link:label>

<link:label id="lab_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1_10C2DFAEB85B0506108C8E6A5C5467AC_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1_10C2DFAEB85B0506108C8E6A5C5467AC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement </link:label>

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<link:label id="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_CB3D770F8E95A91B25B68E6A5C548FAC_totalLabel_en-US" xlink:label="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_CB3D770F8E95A91B25B68E6A5C548FAC" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Income before income taxes </link:label>

<link:label id="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_CB3D770F8E95A91B25B68E6A5C548FAC_label_en-US" xlink:label="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_CB3D770F8E95A91B25B68E6A5C548FAC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest </link:label>

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<link:label id="lab_us-gaap_NetIncomeLoss_A3485B9F931A34D8FC958E6A5C556D2C_label_en-US" xlink:label="lab_us-gaap_NetIncomeLoss_A3485B9F931A34D8FC958E6A5C556D2C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Income (Loss) Attributable to Parent </link:label>

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<link:label id="lab_us-gaap_EarningsPerShareAbstract_2A5089D13AB2C442654C8E6A5C552D8E_terseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareAbstract_2A5089D13AB2C442654C8E6A5C552D8E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Earnings per share (Note 13): </link:label>

<link:label id="lab_us-gaap_EarningsPerShareAbstract_2A5089D13AB2C442654C8E6A5C552D8E_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareAbstract_2A5089D13AB2C442654C8E6A5C552D8E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Earnings Per Share [Abstract] </link:label>

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<link:label id="lab_us-gaap_EarningsPerShareBasic_DF435A0A5D2E18794A208E6A5C55A96B_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareBasic_DF435A0A5D2E18794A208E6A5C55A96B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Earnings Per Share, Basic </link:label>

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<link:label id="lab_us-gaap_EarningsPerShareDiluted_54F6DC82B7278E175A0B8E6A5C555B29_terseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareDiluted_54F6DC82B7278E175A0B8E6A5C555B29" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Diluted (in dollars per share) </link:label>

<link:label id="lab_us-gaap_EarningsPerShareDiluted_54F6DC82B7278E175A0B8E6A5C555B29_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareDiluted_54F6DC82B7278E175A0B8E6A5C555B29" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Earnings Per Share, Diluted </link:label>

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<link:label id="lab_us-gaap_IncomeLossFromDiscontinuedOperationsAndDisposalOfDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShareAbstract_81C823FDDF8CF86149C48E6A5C55CF67_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeLossFromDiscontinuedOperationsAndDisposalOfDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShareAbstract_81C823FDDF8CF86149C48E6A5C55CF67" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Weighted-average shares outstanding (Note 13): </link:label>

<link:label id="lab_us-gaap_IncomeLossFromDiscontinuedOperationsAndDisposalOfDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShareAbstract_81C823FDDF8CF86149C48E6A5C55CF67_label_en-US" xlink:label="lab_us-gaap_IncomeLossFromDiscontinuedOperationsAndDisposalOfDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShareAbstract_81C823FDDF8CF86149C48E6A5C55CF67" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic and Diluted Share [Abstract] </link:label>

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<link:label id="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_56B38F15FDA0AABBC2338E6A5C551FF0_terseLabel_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_56B38F15FDA0AABBC2338E6A5C551FF0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Basic (in shares) </link:label>

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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_56B38F15FDA0AABBC2338E6A5C551FF0" xlink:type="locator"/>

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<link:label id="lab_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_2295A141A10C49FDC4BD8E6A5C5648E7_terseLabel_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_2295A141A10C49FDC4BD8E6A5C5648E7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Diluted (in shares) </link:label>

<link:label id="lab_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_2295A141A10C49FDC4BD8E6A5C5648E7_label_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_2295A141A10C49FDC4BD8E6A5C5648E7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Weighted Average Number of Shares Outstanding, Diluted </link:label>

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<link:label id="lab_us-gaap_AccountingPoliciesAbstract_48746881B6C15D21C2C975B59BBA9BFB_label_en-US" xlink:label="lab_us-gaap_AccountingPoliciesAbstract_48746881B6C15D21C2C975B59BBA9BFB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accounting Policies [Abstract] </link:label>

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<link:label id="lab_core_SummaryOfSignificantAccountingPoliciesTable_8800E1A01ED8ED21019475B59BBB2A25_terseLabel_en-US" xlink:label="lab_core_SummaryOfSignificantAccountingPoliciesTable_8800E1A01ED8ED21019475B59BBB2A25" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Summary of Significant Accounting Policies [Table] </link:label>

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<link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_B02BA8F2D74012071CE775B59BBBA1FE_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_B02BA8F2D74012071CE775B59BBBA1FE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Finite-Lived Intangible Assets by Major Class [Axis] </link:label>

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<link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_723811D1FDC789B46CF975B59BBBBC6C_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_723811D1FDC789B46CF975B59BBBBC6C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finite-Lived Intangible Assets, Major Class Name [Domain] </link:label>

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<link:label id="lab_us-gaap_CustomerRelationshipsMember_29973114765C2EE5DA1475B59BBC78B1_terseLabel_en-US" xlink:label="lab_us-gaap_CustomerRelationshipsMember_29973114765C2EE5DA1475B59BBC78B1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Customer relationships </link:label>

<link:label id="lab_us-gaap_CustomerRelationshipsMember_29973114765C2EE5DA1475B59BBC78B1_label_en-US" xlink:label="lab_us-gaap_CustomerRelationshipsMember_29973114765C2EE5DA1475B59BBC78B1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Customer Relationships [Member] </link:label>

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<link:label id="lab_us-gaap_NoncompeteAgreementsMember_BAC480D701A3260F4AB375B59BBC235F_terseLabel_en-US" xlink:label="lab_us-gaap_NoncompeteAgreementsMember_BAC480D701A3260F4AB375B59BBC235F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Non-competition agreements </link:label>

<link:label id="lab_us-gaap_NoncompeteAgreementsMember_BAC480D701A3260F4AB375B59BBC235F_label_en-US" xlink:label="lab_us-gaap_NoncompeteAgreementsMember_BAC480D701A3260F4AB375B59BBC235F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Noncompete Agreements [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NoncompeteAgreementsMember" xlink:label="loc_us-gaap_NoncompeteAgreementsMember_BAC480D701A3260F4AB375B59BBC235F" xlink:type="locator"/>

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<link:label id="lab_us-gaap_TradeNamesMember_B161935650500E4C4E9F75B59BBCAA1D_terseLabel_en-US" xlink:label="lab_us-gaap_TradeNamesMember_B161935650500E4C4E9F75B59BBCAA1D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Trade names </link:label>

<link:label id="lab_us-gaap_TradeNamesMember_B161935650500E4C4E9F75B59BBCAA1D_label_en-US" xlink:label="lab_us-gaap_TradeNamesMember_B161935650500E4C4E9F75B59BBCAA1D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Trade Names [Member] </link:label>

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<link:label id="lab_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_FBE1AD0761289AD9639D75B59BBC9ED9_verboseLabel_en-US" xlink:label="lab_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_FBE1AD0761289AD9639D75B59BBC9ED9" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Internally developed and other purchased software </link:label>

<link:label id="lab_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_FBE1AD0761289AD9639D75B59BBC9ED9_label_en-US" xlink:label="lab_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_FBE1AD0761289AD9639D75B59BBC9ED9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Software and Software Development Costs [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SoftwareAndSoftwareDevelopmentCostsMember" xlink:label="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_FBE1AD0761289AD9639D75B59BBC9ED9" xlink:type="locator"/>

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<link:label id="lab_srt_RangeAxis_896CBF52F7AFD9EEED4375B59BBC74E7_terseLabel_en-US" xlink:label="lab_srt_RangeAxis_896CBF52F7AFD9EEED4375B59BBC74E7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Statistical Measurement [Axis] </link:label>

<link:label id="lab_srt_RangeAxis_896CBF52F7AFD9EEED4375B59BBC74E7_label_en-US" xlink:label="lab_srt_RangeAxis_896CBF52F7AFD9EEED4375B59BBC74E7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Statistical Measurement [Axis] </link:label>

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<link:label id="lab_srt_RangeMember_4223662BB3724CFC39C475B59BBDABD7_label_en-US" xlink:label="lab_srt_RangeMember_4223662BB3724CFC39C475B59BBDABD7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Statistical Measurement [Domain] </link:label>

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<link:label id="lab_srt_MinimumMember_52D7E94885C3703D53F075B59BBD4507_label_en-US" xlink:label="lab_srt_MinimumMember_52D7E94885C3703D53F075B59BBD4507" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Minimum [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_52D7E94885C3703D53F075B59BBD4507" xlink:type="locator"/>

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<link:label id="lab_srt_MaximumMember_7B076AEF9AC42218313F75B59BBD2EC1_terseLabel_en-US" xlink:label="lab_srt_MaximumMember_7B076AEF9AC42218313F75B59BBD2EC1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Maximum </link:label>

<link:label id="lab_srt_MaximumMember_7B076AEF9AC42218313F75B59BBD2EC1_label_en-US" xlink:label="lab_srt_MaximumMember_7B076AEF9AC42218313F75B59BBD2EC1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Maximum [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_7B076AEF9AC42218313F75B59BBD2EC1" xlink:type="locator"/>

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<link:label id="lab_core_SummaryOfSignificantAccountingPoliciesLineItems_6E52EE893E10985D299C75B59BBD861D_terseLabel_en-US" xlink:label="lab_core_SummaryOfSignificantAccountingPoliciesLineItems_6E52EE893E10985D299C75B59BBD861D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Summary of Significant Accounting Policies [Line Items] </link:label>

<link:label id="lab_core_SummaryOfSignificantAccountingPoliciesLineItems_6E52EE893E10985D299C75B59BBD861D_label_en-US" xlink:label="lab_core_SummaryOfSignificantAccountingPoliciesLineItems_6E52EE893E10985D299C75B59BBD861D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Summary of Significant Accounting Policies [Line Items] </link:label>

<link:label id="lab_core_SummaryOfSignificantAccountingPoliciesLineItems_6E52EE893E10985D299C75B59BBD861D_documentation_en-US" xlink:label="lab_core_SummaryOfSignificantAccountingPoliciesLineItems_6E52EE893E10985D299C75B59BBD861D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> [Line Items] for Summary of Significant Accounting Policies [Table] </link:label>

<link:loc xlink:href="core-20191231.xsd#core_SummaryOfSignificantAccountingPoliciesLineItems" xlink:label="loc_core_SummaryOfSignificantAccountingPoliciesLineItems_6E52EE893E10985D299C75B59BBD861D" xlink:type="locator"/>

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<link:label id="lab_us-gaap_FiniteLivedIntangibleAssetUsefulLife_E59342B51BDF8AD2EB6775B59BBD0D2A_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetUsefulLife_E59342B51BDF8AD2EB6775B59BBD0D2A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Intangible assets, useful life </link:label>

<link:label id="lab_us-gaap_FiniteLivedIntangibleAssetUsefulLife_E59342B51BDF8AD2EB6775B59BBD0D2A_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetUsefulLife_E59342B51BDF8AD2EB6775B59BBD0D2A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finite-Lived Intangible Asset, Useful Life </link:label>

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<link:label id="lab_core_NumberOfAssetGroupings_D67A1651A4EFD7463EFD75B59BBEDA0A_terseLabel_en-US" xlink:label="lab_core_NumberOfAssetGroupings_D67A1651A4EFD7463EFD75B59BBEDA0A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Number of asset groupings </link:label>

<link:label id="lab_core_NumberOfAssetGroupings_D67A1651A4EFD7463EFD75B59BBEDA0A_label_en-US" xlink:label="lab_core_NumberOfAssetGroupings_D67A1651A4EFD7463EFD75B59BBEDA0A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Number Of Asset Groupings </link:label>

<link:label id="lab_core_NumberOfAssetGroupings_D67A1651A4EFD7463EFD75B59BBEDA0A_documentation_en-US" xlink:label="lab_core_NumberOfAssetGroupings_D67A1651A4EFD7463EFD75B59BBEDA0A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Number Of Asset Groupings </link:label>

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<link:label id="lab_us-gaap_ImpairmentOfIntangibleAssetsFinitelived_21EAC568DDD48B30F71275B59BBEBC72_terseLabel_en-US" xlink:label="lab_us-gaap_ImpairmentOfIntangibleAssetsFinitelived_21EAC568DDD48B30F71275B59BBEBC72" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Impairment of long-lived assets, definite-lived intangible assets </link:label>

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<link:label id="lab_us-gaap_CapitalizedComputerSoftwareAdditions_CE2CC6149A6E73E3439675B59BBEA617_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalizedComputerSoftwareAdditions_CE2CC6149A6E73E3439675B59BBEA617" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Capitalized costs related to software developed or obtained for internal use </link:label>

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<link:label id="lab_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_21C393444602B4488DAF75B59B9A5FD5_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_21C393444602B4488DAF75B59B9A5FD5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Business Acquisitions, by Acquisition [Table] </link:label>

<link:label id="lab_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_21C393444602B4488DAF75B59B9A5FD5_label_en-US" xlink:label="lab_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_21C393444602B4488DAF75B59B9A5FD5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Business Acquisitions, by Acquisition [Table] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_21C393444602B4488DAF75B59B9A5FD5" xlink:type="locator"/>

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<link:label id="lab_us-gaap_IncomeStatementLocationAxis_E6D85A50EA253CF4B31E75B59B9ACEEB_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeStatementLocationAxis_E6D85A50EA253CF4B31E75B59B9ACEEB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Income Statement Location [Axis] </link:label>

<link:label id="lab_us-gaap_IncomeStatementLocationAxis_E6D85A50EA253CF4B31E75B59B9ACEEB_label_en-US" xlink:label="lab_us-gaap_IncomeStatementLocationAxis_E6D85A50EA253CF4B31E75B59B9ACEEB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Income Statement Location [Axis] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_E6D85A50EA253CF4B31E75B59B9ACEEB" xlink:type="locator"/>

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<link:label id="lab_us-gaap_IncomeStatementLocationDomain_1D809AB6A201493CB9A575B59B9B01BC_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeStatementLocationDomain_1D809AB6A201493CB9A575B59B9B01BC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Income Statement Location [Domain] </link:label>

<link:label id="lab_us-gaap_IncomeStatementLocationDomain_1D809AB6A201493CB9A575B59B9B01BC_label_en-US" xlink:label="lab_us-gaap_IncomeStatementLocationDomain_1D809AB6A201493CB9A575B59B9B01BC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Income Statement Location [Domain] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_1D809AB6A201493CB9A575B59B9B01BC" xlink:type="locator"/>

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<link:label id="lab_us-gaap_SellingGeneralAndAdministrativeExpensesMember_0ACFD8CF8C91E1EDB06775B59B9B7AFC_terseLabel_en-US" xlink:label="lab_us-gaap_SellingGeneralAndAdministrativeExpensesMember_0ACFD8CF8C91E1EDB06775B59B9B7AFC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Selling, General and Administrative Expenses </link:label>

<link:label id="lab_us-gaap_SellingGeneralAndAdministrativeExpensesMember_0ACFD8CF8C91E1EDB06775B59B9B7AFC_label_en-US" xlink:label="lab_us-gaap_SellingGeneralAndAdministrativeExpensesMember_0ACFD8CF8C91E1EDB06775B59B9B7AFC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Selling, General and Administrative Expenses [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_0ACFD8CF8C91E1EDB06775B59B9B7AFC" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_0ACFD8CF8C91E1EDB06775B59B9B7AFC" xlink:to="lab_us-gaap_SellingGeneralAndAdministrativeExpensesMember_0ACFD8CF8C91E1EDB06775B59B9B7AFC" xlink:type="arc"/>

<link:label id="lab_us-gaap_BusinessAcquisitionAxis_32ACC4FE8E95E12AAD5F75B59B9B8B60_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionAxis_32ACC4FE8E95E12AAD5F75B59B9B8B60" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Business Acquisition [Axis] </link:label>

<link:label id="lab_us-gaap_BusinessAcquisitionAxis_32ACC4FE8E95E12AAD5F75B59B9B8B60_label_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionAxis_32ACC4FE8E95E12AAD5F75B59B9B8B60" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Business Acquisition [Axis] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_32ACC4FE8E95E12AAD5F75B59B9B8B60" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_32ACC4FE8E95E12AAD5F75B59B9B8B60" xlink:to="lab_us-gaap_BusinessAcquisitionAxis_32ACC4FE8E95E12AAD5F75B59B9B8B60" xlink:type="arc"/>

<link:label id="lab_us-gaap_BusinessAcquisitionAcquireeDomain_282C75DF13054C97C8C475B59B9B9622_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionAcquireeDomain_282C75DF13054C97C8C475B59B9B9622" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Business Acquisition, Acquiree [Domain] </link:label>

<link:label id="lab_us-gaap_BusinessAcquisitionAcquireeDomain_282C75DF13054C97C8C475B59B9B9622_label_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionAcquireeDomain_282C75DF13054C97C8C475B59B9B9622" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Business Acquisition, Acquiree [Domain] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_282C75DF13054C97C8C475B59B9B9622" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_282C75DF13054C97C8C475B59B9B9622" xlink:to="lab_us-gaap_BusinessAcquisitionAcquireeDomain_282C75DF13054C97C8C475B59B9B9622" xlink:type="arc"/>

<link:label id="lab_core_FarnerBockenCompanyMember_8A7077AB036C27387A5975B59B9CDE0F_terseLabel_en-US" xlink:label="lab_core_FarnerBockenCompanyMember_8A7077AB036C27387A5975B59B9CDE0F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Farner-Bocken Company </link:label>

<link:label id="lab_core_FarnerBockenCompanyMember_8A7077AB036C27387A5975B59B9CDE0F_label_en-US" xlink:label="lab_core_FarnerBockenCompanyMember_8A7077AB036C27387A5975B59B9CDE0F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Farner-Bocken Company [Member] </link:label>

<link:label id="lab_core_FarnerBockenCompanyMember_8A7077AB036C27387A5975B59B9CDE0F_documentation_en-US" xlink:label="lab_core_FarnerBockenCompanyMember_8A7077AB036C27387A5975B59B9CDE0F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Farner-Bocken Company [Member] </link:label>

<link:loc xlink:href="core-20191231.xsd#core_FarnerBockenCompanyMember" xlink:label="loc_core_FarnerBockenCompanyMember_8A7077AB036C27387A5975B59B9CDE0F" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_FarnerBockenCompanyMember_8A7077AB036C27387A5975B59B9CDE0F" xlink:to="lab_core_FarnerBockenCompanyMember_8A7077AB036C27387A5975B59B9CDE0F" xlink:type="arc"/>

<link:label id="lab_us-gaap_BusinessAcquisitionLineItems_D13E48157E1EB1DCC16C75B59B9CD06F_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionLineItems_D13E48157E1EB1DCC16C75B59B9CD06F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Business Acquisition [Line Items] </link:label>

<link:label id="lab_us-gaap_BusinessAcquisitionLineItems_D13E48157E1EB1DCC16C75B59B9CD06F_label_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionLineItems_D13E48157E1EB1DCC16C75B59B9CD06F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Business Acquisition [Line Items] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_D13E48157E1EB1DCC16C75B59B9CD06F" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_D13E48157E1EB1DCC16C75B59B9CD06F" xlink:to="lab_us-gaap_BusinessAcquisitionLineItems_D13E48157E1EB1DCC16C75B59B9CD06F" xlink:type="arc"/>

<link:label id="lab_us-gaap_BusinessCombinationConsiderationTransferred1_37B732647ADC3989198175B59B9C549A_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessCombinationConsiderationTransferred1_37B732647ADC3989198175B59B9C549A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Total purchase consideration </link:label>

<link:label id="lab_us-gaap_BusinessCombinationConsiderationTransferred1_37B732647ADC3989198175B59B9C549A_label_en-US" xlink:label="lab_us-gaap_BusinessCombinationConsiderationTransferred1_37B732647ADC3989198175B59B9C549A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Business Combination, Consideration Transferred </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferred1" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_37B732647ADC3989198175B59B9C549A" xlink:type="locator"/>

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<link:label id="lab_us-gaap_PaymentsToAcquireBusinessesGross_5EE2C75966F1BAB6027B75B59B9C636D_verboseLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireBusinessesGross_5EE2C75966F1BAB6027B75B59B9C636D" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Consideration paid </link:label>

<link:label id="lab_us-gaap_PaymentsToAcquireBusinessesGross_5EE2C75966F1BAB6027B75B59B9C636D_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireBusinessesGross_5EE2C75966F1BAB6027B75B59B9C636D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payments to Acquire Businesses, Gross </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesGross" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_5EE2C75966F1BAB6027B75B59B9C636D" xlink:type="locator"/>

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<link:label id="lab_us-gaap_BusinessCombinationIndemnificationAssetsAmountAsOfAcquisitionDate_8C42F2F88F28639D59D975B59B9CB6B6_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessCombinationIndemnificationAssetsAmountAsOfAcquisitionDate_8C42F2F88F28639D59D975B59B9CB6B6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Indemnity holdback </link:label>

<link:label id="lab_us-gaap_BusinessCombinationIndemnificationAssetsAmountAsOfAcquisitionDate_8C42F2F88F28639D59D975B59B9CB6B6_label_en-US" xlink:label="lab_us-gaap_BusinessCombinationIndemnificationAssetsAmountAsOfAcquisitionDate_8C42F2F88F28639D59D975B59B9CB6B6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Business Combination, Indemnification Assets, Amount as of Acquisition Date </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationIndemnificationAssetsAmountAsOfAcquisitionDate" xlink:label="loc_us-gaap_BusinessCombinationIndemnificationAssetsAmountAsOfAcquisitionDate_8C42F2F88F28639D59D975B59B9CB6B6" xlink:type="locator"/>

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<link:label id="lab_core_EscrowDepositDisbursementsRelatedToBusinessAcquisitionPeriod_5F527860A6CA3019EF6975B59B9D097C_terseLabel_en-US" xlink:label="lab_core_EscrowDepositDisbursementsRelatedToBusinessAcquisitionPeriod_5F527860A6CA3019EF6975B59B9D097C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Escrow Deposit Disbursements Related To Business Acquisition, Period </link:label>

<link:label id="lab_core_EscrowDepositDisbursementsRelatedToBusinessAcquisitionPeriod_5F527860A6CA3019EF6975B59B9D097C_label_en-US" xlink:label="lab_core_EscrowDepositDisbursementsRelatedToBusinessAcquisitionPeriod_5F527860A6CA3019EF6975B59B9D097C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Escrow Deposit Disbursements Related To Business Acquisition, Period </link:label>

<link:label id="lab_core_EscrowDepositDisbursementsRelatedToBusinessAcquisitionPeriod_5F527860A6CA3019EF6975B59B9D097C_documentation_en-US" xlink:label="lab_core_EscrowDepositDisbursementsRelatedToBusinessAcquisitionPeriod_5F527860A6CA3019EF6975B59B9D097C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Escrow Deposit Disbursements Related To Business Acquisition, Period </link:label>

<link:loc xlink:href="core-20191231.xsd#core_EscrowDepositDisbursementsRelatedToBusinessAcquisitionPeriod" xlink:label="loc_core_EscrowDepositDisbursementsRelatedToBusinessAcquisitionPeriod_5F527860A6CA3019EF6975B59B9D097C" xlink:type="locator"/>

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<link:label id="lab_us-gaap_BusinessCombinationAcquisitionRelatedCosts_581ABA2E8B604C93497C75B59B9DA699_verboseLabel_en-US" xlink:label="lab_us-gaap_BusinessCombinationAcquisitionRelatedCosts_581ABA2E8B604C93497C75B59B9DA699" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Acquisition related costs </link:label>

<link:label id="lab_us-gaap_BusinessCombinationAcquisitionRelatedCosts_581ABA2E8B604C93497C75B59B9DA699_label_en-US" xlink:label="lab_us-gaap_BusinessCombinationAcquisitionRelatedCosts_581ABA2E8B604C93497C75B59B9DA699" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Business Combination, Acquisition Related Costs </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_581ABA2E8B604C93497C75B59B9DA699" xlink:type="locator"/>

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<link:label id="lab_core_LesseeCapitalLeaseTermOfContract_FB3946EA61FFE7D5BA4A75B59B9DCCA8_terseLabel_en-US" xlink:label="lab_core_LesseeCapitalLeaseTermOfContract_FB3946EA61FFE7D5BA4A75B59B9DCCA8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Capital lease, term </link:label>

<link:label id="lab_core_LesseeCapitalLeaseTermOfContract_FB3946EA61FFE7D5BA4A75B59B9DCCA8_label_en-US" xlink:label="lab_core_LesseeCapitalLeaseTermOfContract_FB3946EA61FFE7D5BA4A75B59B9DCCA8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Capital Lease, Term Of Contract </link:label>

<link:label id="lab_core_LesseeCapitalLeaseTermOfContract_FB3946EA61FFE7D5BA4A75B59B9DCCA8_documentation_en-US" xlink:label="lab_core_LesseeCapitalLeaseTermOfContract_FB3946EA61FFE7D5BA4A75B59B9DCCA8" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Lessee, Capital Lease, Term Of Contract </link:label>

<link:loc xlink:href="core-20191231.xsd#core_LesseeCapitalLeaseTermOfContract" xlink:label="loc_core_LesseeCapitalLeaseTermOfContract_FB3946EA61FFE7D5BA4A75B59B9DCCA8" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_LesseeCapitalLeaseTermOfContract_FB3946EA61FFE7D5BA4A75B59B9DCCA8" xlink:to="lab_core_LesseeCapitalLeaseTermOfContract_FB3946EA61FFE7D5BA4A75B59B9DCCA8" xlink:type="arc"/>

<link:label id="lab_us-gaap_CapitalLeaseObligations_67C94C29F01EFB4D3BD875B59B9DBD43_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeaseObligations_67C94C29F01EFB4D3BD875B59B9DBD43" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Obligations under finance leases </link:label>

<link:label id="lab_us-gaap_CapitalLeaseObligations_67C94C29F01EFB4D3BD875B59B9DBD43_label_en-US" xlink:label="lab_us-gaap_CapitalLeaseObligations_67C94C29F01EFB4D3BD875B59B9DBD43" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Capital Lease Obligations </link:label>

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<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CapitalLeaseObligations_67C94C29F01EFB4D3BD875B59B9DBD43" xlink:to="lab_us-gaap_CapitalLeaseObligations_67C94C29F01EFB4D3BD875B59B9DBD43" xlink:type="arc"/>

<link:label id="lab_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_3F8CB73505A6A33D461075B59B9D8737_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_3F8CB73505A6A33D461075B59B9D8737" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Net sales </link:label>

<link:label id="lab_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_3F8CB73505A6A33D461075B59B9D8737_label_en-US" xlink:label="lab_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_3F8CB73505A6A33D461075B59B9D8737" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual" xlink:label="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_3F8CB73505A6A33D461075B59B9D8737" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_3F8CB73505A6A33D461075B59B9D8737" xlink:to="lab_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_3F8CB73505A6A33D461075B59B9D8737" xlink:type="arc"/>

<link:label id="lab_us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual_1B4F26A1ECEE62C6F0E475B59B9DDE77_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual_1B4F26A1ECEE62C6F0E475B59B9DDE77" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Operating income </link:label>

<link:label id="lab_us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual_1B4F26A1ECEE62C6F0E475B59B9DDE77_label_en-US" xlink:label="lab_us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual_1B4F26A1ECEE62C6F0E475B59B9DDE77" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual" xlink:label="loc_us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual_1B4F26A1ECEE62C6F0E475B59B9DDE77" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual_1B4F26A1ECEE62C6F0E475B59B9DDE77" xlink:to="lab_us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual_1B4F26A1ECEE62C6F0E475B59B9DDE77" xlink:type="arc"/>

<link:label id="lab_us-gaap_LesseeLeaseDescriptionTable_A6411FD6C613AFA174C475B59B47302E_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeLeaseDescriptionTable_A6411FD6C613AFA174C475B59B47302E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Lessee, Lease, Description [Table] </link:label>

<link:label id="lab_us-gaap_LesseeLeaseDescriptionTable_A6411FD6C613AFA174C475B59B47302E_label_en-US" xlink:label="lab_us-gaap_LesseeLeaseDescriptionTable_A6411FD6C613AFA174C475B59B47302E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Lease, Description [Table] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeLeaseDescriptionTable" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_A6411FD6C613AFA174C475B59B47302E" xlink:type="locator"/>

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<link:label id="lab_us-gaap_LesseeLeaseDescriptionLineItems_BDF5FF68E531BE9F935975B59B48C7C9_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeLeaseDescriptionLineItems_BDF5FF68E531BE9F935975B59B48C7C9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Lessee, Lease, Description [Line Items] </link:label>

<link:label id="lab_us-gaap_LesseeLeaseDescriptionLineItems_BDF5FF68E531BE9F935975B59B48C7C9_label_en-US" xlink:label="lab_us-gaap_LesseeLeaseDescriptionLineItems_BDF5FF68E531BE9F935975B59B48C7C9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Lease, Description [Line Items] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeLeaseDescriptionLineItems" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_BDF5FF68E531BE9F935975B59B48C7C9" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_BDF5FF68E531BE9F935975B59B48C7C9" xlink:to="lab_us-gaap_LesseeLeaseDescriptionLineItems_BDF5FF68E531BE9F935975B59B48C7C9" xlink:type="arc"/>

<link:label id="lab_core_LesseeNumberOfOptionsToExtendLease_77A7DCFCB9D7D81F957375B59B483094_terseLabel_en-US" xlink:label="lab_core_LesseeNumberOfOptionsToExtendLease_77A7DCFCB9D7D81F957375B59B483094" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Number of lease extension options </link:label>

<link:label id="lab_core_LesseeNumberOfOptionsToExtendLease_77A7DCFCB9D7D81F957375B59B483094_label_en-US" xlink:label="lab_core_LesseeNumberOfOptionsToExtendLease_77A7DCFCB9D7D81F957375B59B483094" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Number Of Options To Extend Lease </link:label>

<link:label id="lab_core_LesseeNumberOfOptionsToExtendLease_77A7DCFCB9D7D81F957375B59B483094_documentation_en-US" xlink:label="lab_core_LesseeNumberOfOptionsToExtendLease_77A7DCFCB9D7D81F957375B59B483094" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Lessee, Number Of Options To Extend Lease </link:label>

<link:loc xlink:href="core-20191231.xsd#core_LesseeNumberOfOptionsToExtendLease" xlink:label="loc_core_LesseeNumberOfOptionsToExtendLease_77A7DCFCB9D7D81F957375B59B483094" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_LesseeNumberOfOptionsToExtendLease_77A7DCFCB9D7D81F957375B59B483094" xlink:to="lab_core_LesseeNumberOfOptionsToExtendLease_77A7DCFCB9D7D81F957375B59B483094" xlink:type="arc"/>

<link:label id="lab_core_LesseeLeaseLeaseNotYetCommencedAssumptionAndJudgmentValueOfUnderlyingAssetAmount_44322C9094B236EC3F5075B59B48FAB3_terseLabel_en-US" xlink:label="lab_core_LesseeLeaseLeaseNotYetCommencedAssumptionAndJudgmentValueOfUnderlyingAssetAmount_44322C9094B236EC3F5075B59B48FAB3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Leases not yet commenced </link:label>

<link:label id="lab_core_LesseeLeaseLeaseNotYetCommencedAssumptionAndJudgmentValueOfUnderlyingAssetAmount_44322C9094B236EC3F5075B59B48FAB3_label_en-US" xlink:label="lab_core_LesseeLeaseLeaseNotYetCommencedAssumptionAndJudgmentValueOfUnderlyingAssetAmount_44322C9094B236EC3F5075B59B48FAB3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Lease, Lease Not Yet Commenced, Assumption And Judgment, Value Of Underlying Asset, Amount </link:label>

<link:label id="lab_core_LesseeLeaseLeaseNotYetCommencedAssumptionAndJudgmentValueOfUnderlyingAssetAmount_44322C9094B236EC3F5075B59B48FAB3_documentation_en-US" xlink:label="lab_core_LesseeLeaseLeaseNotYetCommencedAssumptionAndJudgmentValueOfUnderlyingAssetAmount_44322C9094B236EC3F5075B59B48FAB3" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Lessee, Lease, Lease Not Yet Commenced, Assumption And Judgment, Value Of Underlying Asset, Amount </link:label>

<link:loc xlink:href="core-20191231.xsd#core_LesseeLeaseLeaseNotYetCommencedAssumptionAndJudgmentValueOfUnderlyingAssetAmount" xlink:label="loc_core_LesseeLeaseLeaseNotYetCommencedAssumptionAndJudgmentValueOfUnderlyingAssetAmount_44322C9094B236EC3F5075B59B48FAB3" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_LesseeLeaseLeaseNotYetCommencedAssumptionAndJudgmentValueOfUnderlyingAssetAmount_44322C9094B236EC3F5075B59B48FAB3" xlink:to="lab_core_LesseeLeaseLeaseNotYetCommencedAssumptionAndJudgmentValueOfUnderlyingAssetAmount_44322C9094B236EC3F5075B59B48FAB3" xlink:type="arc"/>

<link:label id="lab_us-gaap_DebtDisclosureAbstract_288C1FAB6726F071B6627B2590666058_label_en-US" xlink:label="lab_us-gaap_DebtDisclosureAbstract_288C1FAB6726F071B6627B2590666058" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Disclosure [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtDisclosureAbstract" xlink:label="loc_us-gaap_DebtDisclosureAbstract_288C1FAB6726F071B6627B2590666058" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtDisclosureAbstract_288C1FAB6726F071B6627B2590666058" xlink:to="lab_us-gaap_DebtDisclosureAbstract_288C1FAB6726F071B6627B2590666058" xlink:type="arc"/>

<link:label id="lab_us-gaap_DebtInstrumentTable_1230BDD136E20A1939467B2590672951_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentTable_1230BDD136E20A1939467B2590672951" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Long-term Debt Instruments [Table] </link:label>

<link:label id="lab_us-gaap_DebtInstrumentTable_1230BDD136E20A1939467B2590672951_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentTable_1230BDD136E20A1939467B2590672951" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Long-term Debt Instruments [Table] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_1230BDD136E20A1939467B2590672951" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentTable_1230BDD136E20A1939467B2590672951" xlink:to="lab_us-gaap_DebtInstrumentTable_1230BDD136E20A1939467B2590672951" xlink:type="arc"/>

<link:label id="lab_us-gaap_CreditFacilityAxis_E62F31B328F437795C7D7B2590671D56_terseLabel_en-US" xlink:label="lab_us-gaap_CreditFacilityAxis_E62F31B328F437795C7D7B2590671D56" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Credit Facility [Axis] </link:label>

<link:label id="lab_us-gaap_CreditFacilityAxis_E62F31B328F437795C7D7B2590671D56_label_en-US" xlink:label="lab_us-gaap_CreditFacilityAxis_E62F31B328F437795C7D7B2590671D56" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Credit Facility [Axis] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CreditFacilityAxis" xlink:label="loc_us-gaap_CreditFacilityAxis_E62F31B328F437795C7D7B2590671D56" xlink:type="locator"/>

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<link:label id="lab_us-gaap_CreditFacilityDomain_D77FCF84B48ACBD797D77B2590673D01_terseLabel_en-US" xlink:label="lab_us-gaap_CreditFacilityDomain_D77FCF84B48ACBD797D77B2590673D01" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Credit Facility [Domain] </link:label>

<link:label id="lab_us-gaap_CreditFacilityDomain_D77FCF84B48ACBD797D77B2590673D01_label_en-US" xlink:label="lab_us-gaap_CreditFacilityDomain_D77FCF84B48ACBD797D77B2590673D01" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Credit Facility [Domain] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="loc_us-gaap_CreditFacilityDomain_D77FCF84B48ACBD797D77B2590673D01" xlink:type="locator"/>

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<link:label id="lab_us-gaap_RevolvingCreditFacilityMember_9AE8D65B54F5B8E0A80D7B25906712DE_terseLabel_en-US" xlink:label="lab_us-gaap_RevolvingCreditFacilityMember_9AE8D65B54F5B8E0A80D7B25906712DE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Revolving Credit Facility </link:label>

<link:label id="lab_us-gaap_RevolvingCreditFacilityMember_9AE8D65B54F5B8E0A80D7B25906712DE_label_en-US" xlink:label="lab_us-gaap_RevolvingCreditFacilityMember_9AE8D65B54F5B8E0A80D7B25906712DE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Revolving Credit Facility [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevolvingCreditFacilityMember" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_9AE8D65B54F5B8E0A80D7B25906712DE" xlink:type="locator"/>

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<link:label id="lab_us-gaap_LongtermDebtTypeAxis_BF6C9C098AD6B65116BA7B259068674A_terseLabel_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeAxis_BF6C9C098AD6B65116BA7B259068674A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Long-term Debt, Type [Axis] </link:label>

<link:label id="lab_us-gaap_LongtermDebtTypeAxis_BF6C9C098AD6B65116BA7B259068674A_label_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeAxis_BF6C9C098AD6B65116BA7B259068674A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Long-term Debt, Type [Axis] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_BF6C9C098AD6B65116BA7B259068674A" xlink:type="locator"/>

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<link:label id="lab_us-gaap_LongtermDebtTypeDomain_33375145BA0331DC71D57B2590689338_terseLabel_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeDomain_33375145BA0331DC71D57B2590689338" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Long-term Debt, Type [Domain] </link:label>

<link:label id="lab_us-gaap_LongtermDebtTypeDomain_33375145BA0331DC71D57B2590689338_label_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeDomain_33375145BA0331DC71D57B2590689338" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Long-term Debt, Type [Domain] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_33375145BA0331DC71D57B2590689338" xlink:type="locator"/>

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<link:label id="lab_us-gaap_DebtInstrumentLineItems_E3B4504A071907ED87717B2590692541_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentLineItems_E3B4504A071907ED87717B2590692541" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Debt Instrument [Line Items] </link:label>

<link:label id="lab_us-gaap_DebtInstrumentLineItems_E3B4504A071907ED87717B2590692541_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentLineItems_E3B4504A071907ED87717B2590692541" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument [Line Items] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_E3B4504A071907ED87717B2590692541" xlink:type="locator"/>

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<link:label id="lab_us-gaap_DebtInstrumentCarryingAmount_4B065FC2041D6216ACA97B2590695F8D_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentCarryingAmount_4B065FC2041D6216ACA97B2590695F8D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Amounts borrowed (Credit Facility) </link:label>

<link:label id="lab_us-gaap_DebtInstrumentCarryingAmount_4B065FC2041D6216ACA97B2590695F8D_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentCarryingAmount_4B065FC2041D6216ACA97B2590695F8D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Long-term Debt, Gross </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentCarryingAmount" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_4B065FC2041D6216ACA97B2590695F8D" xlink:type="locator"/>

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<link:label id="lab_us-gaap_FinanceLeaseLiabilityNoncurrent_BDEF93BC0A1DD4F579347B259323B802_verboseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityNoncurrent_BDEF93BC0A1DD4F579347B259323B802" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Obligations under finance leases </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityNoncurrent" xlink:label="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_BDEF93BC0A1DD4F579347B259323B802" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_BDEF93BC0A1DD4F579347B259323B802" xlink:to="lab_us-gaap_FinanceLeaseLiabilityNoncurrent_BDEF93BC0A1DD4F579347B259323B802" xlink:type="arc"/>

<link:label id="lab_us-gaap_LongTermDebtAndCapitalLeaseObligations_1AB56A5D85880220956D7B25906AF9B9_totalLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtAndCapitalLeaseObligations_1AB56A5D85880220956D7B25906AF9B9" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total long-term debt </link:label>

<link:label id="lab_us-gaap_LongTermDebtAndCapitalLeaseObligations_1AB56A5D85880220956D7B25906AF9B9_label_en-US" xlink:label="lab_us-gaap_LongTermDebtAndCapitalLeaseObligations_1AB56A5D85880220956D7B25906AF9B9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Long-term Debt and Lease Obligation </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_1AB56A5D85880220956D7B25906AF9B9" xlink:type="locator"/>

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<link:label id="lab_us-gaap_LettersOfCreditOutstandingAmount_3A86E480E4E79BC27A977B25906A43E4_terseLabel_en-US" xlink:label="lab_us-gaap_LettersOfCreditOutstandingAmount_3A86E480E4E79BC27A977B25906A43E4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Outstanding letters of credit </link:label>

<link:label id="lab_us-gaap_LettersOfCreditOutstandingAmount_3A86E480E4E79BC27A977B25906A43E4_label_en-US" xlink:label="lab_us-gaap_LettersOfCreditOutstandingAmount_3A86E480E4E79BC27A977B25906A43E4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Letters of Credit Outstanding, Amount </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LettersOfCreditOutstandingAmount" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_3A86E480E4E79BC27A977B25906A43E4" xlink:type="locator"/>

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<link:label id="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_5E90C63951D1A39EBB487B25906AE68E_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_5E90C63951D1A39EBB487B25906AE68E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Amounts available to borrow </link:label>

<link:label id="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_5E90C63951D1A39EBB487B25906AE68E_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_5E90C63951D1A39EBB487B25906AE68E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Remaining Borrowing Capacity </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_5E90C63951D1A39EBB487B25906AE68E" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_5E90C63951D1A39EBB487B25906AE68E" xlink:to="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_5E90C63951D1A39EBB487B25906AE68E" xlink:type="arc"/>

<link:label id="lab_us-gaap_LineOfCreditFacilityAverageOutstandingAmount_C41AE213DCDF3DDC3DEA7B25906B04E2_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityAverageOutstandingAmount_C41AE213DCDF3DDC3DEA7B25906B04E2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Average borrowings </link:label>

<link:label id="lab_us-gaap_LineOfCreditFacilityAverageOutstandingAmount_C41AE213DCDF3DDC3DEA7B25906B04E2_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityAverageOutstandingAmount_C41AE213DCDF3DDC3DEA7B25906B04E2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Average Outstanding Amount </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityAverageOutstandingAmount" xlink:label="loc_us-gaap_LineOfCreditFacilityAverageOutstandingAmount_C41AE213DCDF3DDC3DEA7B25906B04E2" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityAverageOutstandingAmount_C41AE213DCDF3DDC3DEA7B25906B04E2" xlink:to="lab_us-gaap_LineOfCreditFacilityAverageOutstandingAmount_C41AE213DCDF3DDC3DEA7B25906B04E2" xlink:type="arc"/>

<link:label id="lab_us-gaap_UnamortizedDebtIssuanceExpense_141E6DC83B8DD43DF1467B25906B549C_terseLabel_en-US" xlink:label="lab_us-gaap_UnamortizedDebtIssuanceExpense_141E6DC83B8DD43DF1467B25906B549C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Unamortized debt issuance costs </link:label>

<link:label id="lab_us-gaap_UnamortizedDebtIssuanceExpense_141E6DC83B8DD43DF1467B25906B549C_label_en-US" xlink:label="lab_us-gaap_UnamortizedDebtIssuanceExpense_141E6DC83B8DD43DF1467B25906B549C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Unamortized Debt Issuance Expense </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_UnamortizedDebtIssuanceExpense" xlink:label="loc_us-gaap_UnamortizedDebtIssuanceExpense_141E6DC83B8DD43DF1467B25906B549C" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_UnamortizedDebtIssuanceExpense_141E6DC83B8DD43DF1467B25906B549C" xlink:to="lab_us-gaap_UnamortizedDebtIssuanceExpense_141E6DC83B8DD43DF1467B25906B549C" xlink:type="arc"/>

<link:label id="lab_us-gaap_LineOfCreditFacilityInterestRateDuringPeriod_B5833B66EDE32FC75BFD7B25906BB580_verboseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityInterestRateDuringPeriod_B5833B66EDE32FC75BFD7B25906BB580" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Weighted-average interest rate (percent) </link:label>

<link:label id="lab_us-gaap_LineOfCreditFacilityInterestRateDuringPeriod_B5833B66EDE32FC75BFD7B25906BB580_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityInterestRateDuringPeriod_B5833B66EDE32FC75BFD7B25906BB580" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Interest Rate During Period </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityInterestRateDuringPeriod" xlink:label="loc_us-gaap_LineOfCreditFacilityInterestRateDuringPeriod_B5833B66EDE32FC75BFD7B25906BB580" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityInterestRateDuringPeriod_B5833B66EDE32FC75BFD7B25906BB580" xlink:to="lab_us-gaap_LineOfCreditFacilityInterestRateDuringPeriod_B5833B66EDE32FC75BFD7B25906BB580" xlink:type="arc"/>

<link:label id="lab_core_LineOfCreditFacilityPotentiallyAdditionalBorrowingCapacity_A0089D5532833A93110A7B25906B04B7_terseLabel_en-US" xlink:label="lab_core_LineOfCreditFacilityPotentiallyAdditionalBorrowingCapacity_A0089D5532833A93110A7B25906B04B7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Revolving credit facility, expansion feature </link:label>

<link:label id="lab_core_LineOfCreditFacilityPotentiallyAdditionalBorrowingCapacity_A0089D5532833A93110A7B25906B04B7_label_en-US" xlink:label="lab_core_LineOfCreditFacilityPotentiallyAdditionalBorrowingCapacity_A0089D5532833A93110A7B25906B04B7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Potentially Additional Borrowing Capacity </link:label>

<link:label id="lab_core_LineOfCreditFacilityPotentiallyAdditionalBorrowingCapacity_A0089D5532833A93110A7B25906B04B7_documentation_en-US" xlink:label="lab_core_LineOfCreditFacilityPotentiallyAdditionalBorrowingCapacity_A0089D5532833A93110A7B25906B04B7" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Potentially Additional Borrowing Capacity </link:label>

<link:loc xlink:href="core-20191231.xsd#core_LineOfCreditFacilityPotentiallyAdditionalBorrowingCapacity" xlink:label="loc_core_LineOfCreditFacilityPotentiallyAdditionalBorrowingCapacity_A0089D5532833A93110A7B25906B04B7" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_LineOfCreditFacilityPotentiallyAdditionalBorrowingCapacity_A0089D5532833A93110A7B25906B04B7" xlink:to="lab_core_LineOfCreditFacilityPotentiallyAdditionalBorrowingCapacity_A0089D5532833A93110A7B25906B04B7" xlink:type="arc"/>

<link:label id="lab_us-gaap_LineOfCreditFacilityCommitmentFeeAmount_905931EFFC288CB355E77B25906BD9A8_verboseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCommitmentFeeAmount_905931EFFC288CB355E77B25906BD9A8" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Unused credit facility and letter of credit participation </link:label>

<link:label id="lab_us-gaap_LineOfCreditFacilityCommitmentFeeAmount_905931EFFC288CB355E77B25906BD9A8_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCommitmentFeeAmount_905931EFFC288CB355E77B25906BD9A8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Commitment Fee Amount </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityCommitmentFeeAmount" xlink:label="loc_us-gaap_LineOfCreditFacilityCommitmentFeeAmount_905931EFFC288CB355E77B25906BD9A8" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityCommitmentFeeAmount_905931EFFC288CB355E77B25906BD9A8" xlink:to="lab_us-gaap_LineOfCreditFacilityCommitmentFeeAmount_905931EFFC288CB355E77B25906BD9A8" xlink:type="arc"/>

<link:label id="lab_us-gaap_AmortizationOfFinancingCosts_5189AD1846559E6516E77B25906BEBCA_verboseLabel_en-US" xlink:label="lab_us-gaap_AmortizationOfFinancingCosts_5189AD1846559E6516E77B25906BEBCA" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Charges related to amortization of debt issuance costs </link:label>

<link:label id="lab_us-gaap_AmortizationOfFinancingCosts_5189AD1846559E6516E77B25906BEBCA_label_en-US" xlink:label="lab_us-gaap_AmortizationOfFinancingCosts_5189AD1846559E6516E77B25906BEBCA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Amortization of Debt Issuance Costs </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AmortizationOfFinancingCosts" xlink:label="loc_us-gaap_AmortizationOfFinancingCosts_5189AD1846559E6516E77B25906BEBCA" xlink:type="locator"/>

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<link:label id="lab_us-gaap_IncomeTaxDisclosureAbstract_D890839E63AD2A45AA9B75B59AE9A3D3_label_en-US" xlink:label="lab_us-gaap_IncomeTaxDisclosureAbstract_D890839E63AD2A45AA9B75B59AE9A3D3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Income Tax Disclosure [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxDisclosureAbstract" xlink:label="loc_us-gaap_IncomeTaxDisclosureAbstract_D890839E63AD2A45AA9B75B59AE9A3D3" xlink:type="locator"/>

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<link:label id="lab_us-gaap_ComponentsOfIncomeTaxExpenseBenefitContinuingOperationsAbstract_8E94B0622B0D0B35B30175B59AE90923_terseLabel_en-US" xlink:label="lab_us-gaap_ComponentsOfIncomeTaxExpenseBenefitContinuingOperationsAbstract_8E94B0622B0D0B35B30175B59AE90923" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Components of Income Tax Expense (Benefit), Continuing Operations [Abstract] </link:label>

<link:label id="lab_us-gaap_ComponentsOfIncomeTaxExpenseBenefitContinuingOperationsAbstract_8E94B0622B0D0B35B30175B59AE90923_label_en-US" xlink:label="lab_us-gaap_ComponentsOfIncomeTaxExpenseBenefitContinuingOperationsAbstract_8E94B0622B0D0B35B30175B59AE90923" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Components of Income Tax Expense (Benefit), Continuing Operations [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ComponentsOfIncomeTaxExpenseBenefitContinuingOperationsAbstract" xlink:label="loc_us-gaap_ComponentsOfIncomeTaxExpenseBenefitContinuingOperationsAbstract_8E94B0622B0D0B35B30175B59AE90923" xlink:type="locator"/>

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<link:label id="lab_us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract_6DD6D80D269700784CDA75B59AE9BED2_terseLabel_en-US" xlink:label="lab_us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract_6DD6D80D269700784CDA75B59AE9BED2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Current: </link:label>

<link:label id="lab_us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract_6DD6D80D269700784CDA75B59AE9BED2_label_en-US" xlink:label="lab_us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract_6DD6D80D269700784CDA75B59AE9BED2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Current Income Tax Expense (Benefit), Continuing Operations [Abstract] </link:label>

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<link:label id="lab_us-gaap_CurrentFederalTaxExpenseBenefit_CE635B83B82A2B042B4775B59AE90346_terseLabel_en-US" xlink:label="lab_us-gaap_CurrentFederalTaxExpenseBenefit_CE635B83B82A2B042B4775B59AE90346" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Federal </link:label>

<link:label id="lab_us-gaap_CurrentFederalTaxExpenseBenefit_CE635B83B82A2B042B4775B59AE90346_label_en-US" xlink:label="lab_us-gaap_CurrentFederalTaxExpenseBenefit_CE635B83B82A2B042B4775B59AE90346" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Current Federal Tax Expense (Benefit) </link:label>

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<link:label id="lab_us-gaap_OtherReceivablesNetCurrentAbstract_FD37894DC30B49AC31F17B246C913186_label_en-US" xlink:label="lab_us-gaap_OtherReceivablesNetCurrentAbstract_FD37894DC30B49AC31F17B246C913186" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Receivables, Net, Current [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherReceivablesNetCurrentAbstract" xlink:label="loc_us-gaap_OtherReceivablesNetCurrentAbstract_FD37894DC30B49AC31F17B246C913186" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherReceivablesNetCurrentAbstract_FD37894DC30B49AC31F17B246C913186" xlink:to="lab_us-gaap_OtherReceivablesNetCurrentAbstract_FD37894DC30B49AC31F17B246C913186" xlink:type="arc"/>

<link:label id="lab_core_VendorReceivablesNetCurrent_C04573BA98AA900202DF7B246C92CACA_terseLabel_en-US" xlink:label="lab_core_VendorReceivablesNetCurrent_C04573BA98AA900202DF7B246C92CACA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Vendor receivables, net </link:label>

<link:label id="lab_core_VendorReceivablesNetCurrent_C04573BA98AA900202DF7B246C92CACA_label_en-US" xlink:label="lab_core_VendorReceivablesNetCurrent_C04573BA98AA900202DF7B246C92CACA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Vendor Receivables, Net, Current </link:label>

<link:label id="lab_core_VendorReceivablesNetCurrent_C04573BA98AA900202DF7B246C92CACA_documentation_en-US" xlink:label="lab_core_VendorReceivablesNetCurrent_C04573BA98AA900202DF7B246C92CACA" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Vendor Receivables, Net, Current </link:label>

<link:loc xlink:href="core-20191231.xsd#core_VendorReceivablesNetCurrent" xlink:label="loc_core_VendorReceivablesNetCurrent_C04573BA98AA900202DF7B246C92CACA" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_VendorReceivablesNetCurrent_C04573BA98AA900202DF7B246C92CACA" xlink:to="lab_core_VendorReceivablesNetCurrent_C04573BA98AA900202DF7B246C92CACA" xlink:type="arc"/>

<link:label id="lab_us-gaap_InsuranceSettlementsReceivableCurrent_6D5EB27CCF4ED6C61AA37B246C9282E4_terseLabel_en-US" xlink:label="lab_us-gaap_InsuranceSettlementsReceivableCurrent_6D5EB27CCF4ED6C61AA37B246C9282E4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Insurance recoverables, current </link:label>

<link:label id="lab_us-gaap_InsuranceSettlementsReceivableCurrent_6D5EB27CCF4ED6C61AA37B246C9282E4_label_en-US" xlink:label="lab_us-gaap_InsuranceSettlementsReceivableCurrent_6D5EB27CCF4ED6C61AA37B246C9282E4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Insurance Settlements Receivable, Current </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InsuranceSettlementsReceivableCurrent" xlink:label="loc_us-gaap_InsuranceSettlementsReceivableCurrent_6D5EB27CCF4ED6C61AA37B246C9282E4" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InsuranceSettlementsReceivableCurrent_6D5EB27CCF4ED6C61AA37B246C9282E4" xlink:to="lab_us-gaap_InsuranceSettlementsReceivableCurrent_6D5EB27CCF4ED6C61AA37B246C9282E4" xlink:type="arc"/>

<link:label id="lab_core_OtherNontradeReceivablesNetCurrent_72607CAB1A33A7CF3DAA7B246C92BEBA_terseLabel_en-US" xlink:label="lab_core_OtherNontradeReceivablesNetCurrent_72607CAB1A33A7CF3DAA7B246C92BEBA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other miscellaneous receivables </link:label>

<link:label id="lab_core_OtherNontradeReceivablesNetCurrent_72607CAB1A33A7CF3DAA7B246C92BEBA_label_en-US" xlink:label="lab_core_OtherNontradeReceivablesNetCurrent_72607CAB1A33A7CF3DAA7B246C92BEBA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Nontrade Receivables, Net, Current </link:label>

<link:label id="lab_core_OtherNontradeReceivablesNetCurrent_72607CAB1A33A7CF3DAA7B246C92BEBA_documentation_en-US" xlink:label="lab_core_OtherNontradeReceivablesNetCurrent_72607CAB1A33A7CF3DAA7B246C92BEBA" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Other Nontrade Receivables, Net, Current </link:label>

<link:loc xlink:href="core-20191231.xsd#core_OtherNontradeReceivablesNetCurrent" xlink:label="loc_core_OtherNontradeReceivablesNetCurrent_72607CAB1A33A7CF3DAA7B246C92BEBA" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_OtherNontradeReceivablesNetCurrent_72607CAB1A33A7CF3DAA7B246C92BEBA" xlink:to="lab_core_OtherNontradeReceivablesNetCurrent_72607CAB1A33A7CF3DAA7B246C92BEBA" xlink:type="arc"/>

<link:label id="lab_us-gaap_OtherReceivablesNetCurrent_2FA4E847F0743C64A0E87B246C92A8D4_totalLabel_en-US" xlink:label="lab_us-gaap_OtherReceivablesNetCurrent_2FA4E847F0743C64A0E87B246C92A8D4" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total other receivables, net </link:label>

<link:label id="lab_us-gaap_OtherReceivablesNetCurrent_2FA4E847F0743C64A0E87B246C92A8D4_label_en-US" xlink:label="lab_us-gaap_OtherReceivablesNetCurrent_2FA4E847F0743C64A0E87B246C92A8D4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Receivables, Net, Current </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherReceivablesNetCurrent" xlink:label="loc_us-gaap_OtherReceivablesNetCurrent_2FA4E847F0743C64A0E87B246C92A8D4" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherReceivablesNetCurrent_2FA4E847F0743C64A0E87B246C92A8D4" xlink:to="lab_us-gaap_OtherReceivablesNetCurrent_2FA4E847F0743C64A0E87B246C92A8D4" xlink:type="arc"/>

<link:label id="lab_core_DepositsAndPrepaymentsAbstract_CB0287381A96028FE90D7B246C92F9D7_terseLabel_en-US" xlink:label="lab_core_DepositsAndPrepaymentsAbstract_CB0287381A96028FE90D7B246C92F9D7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Deposits and Prepayments [Abstract] </link:label>

<link:label id="lab_core_DepositsAndPrepaymentsAbstract_CB0287381A96028FE90D7B246C92F9D7_label_en-US" xlink:label="lab_core_DepositsAndPrepaymentsAbstract_CB0287381A96028FE90D7B246C92F9D7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deposits and Prepayments [Abstract] </link:label>

<link:label id="lab_core_DepositsAndPrepaymentsAbstract_CB0287381A96028FE90D7B246C92F9D7_documentation_en-US" xlink:label="lab_core_DepositsAndPrepaymentsAbstract_CB0287381A96028FE90D7B246C92F9D7" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Deposits and Prepayments [Abstract] </link:label>

<link:loc xlink:href="core-20191231.xsd#core_DepositsAndPrepaymentsAbstract" xlink:label="loc_core_DepositsAndPrepaymentsAbstract_CB0287381A96028FE90D7B246C92F9D7" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_DepositsAndPrepaymentsAbstract_CB0287381A96028FE90D7B246C92F9D7" xlink:to="lab_core_DepositsAndPrepaymentsAbstract_CB0287381A96028FE90D7B246C92F9D7" xlink:type="arc"/>

<link:label id="lab_core_VendorPrepaidExpenseCurrent_B14B7034FB3E80379F2C7B246C92AB00_terseLabel_en-US" xlink:label="lab_core_VendorPrepaidExpenseCurrent_B14B7034FB3E80379F2C7B246C92AB00" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Vendor prepayments </link:label>

<link:label id="lab_core_VendorPrepaidExpenseCurrent_B14B7034FB3E80379F2C7B246C92AB00_label_en-US" xlink:label="lab_core_VendorPrepaidExpenseCurrent_B14B7034FB3E80379F2C7B246C92AB00" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Vendor Prepaid Expense, Current </link:label>

<link:label id="lab_core_VendorPrepaidExpenseCurrent_B14B7034FB3E80379F2C7B246C92AB00_documentation_en-US" xlink:label="lab_core_VendorPrepaidExpenseCurrent_B14B7034FB3E80379F2C7B246C92AB00" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Vendor Prepaid Expense, Current </link:label>

<link:loc xlink:href="core-20191231.xsd#core_VendorPrepaidExpenseCurrent" xlink:label="loc_core_VendorPrepaidExpenseCurrent_B14B7034FB3E80379F2C7B246C92AB00" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_VendorPrepaidExpenseCurrent_B14B7034FB3E80379F2C7B246C92AB00" xlink:to="lab_core_VendorPrepaidExpenseCurrent_B14B7034FB3E80379F2C7B246C92AB00" xlink:type="arc"/>

<link:label id="lab_us-gaap_PrepaidTaxes_8C8CF478DFF7F567E0B87B246C93DA87_terseLabel_en-US" xlink:label="lab_us-gaap_PrepaidTaxes_8C8CF478DFF7F567E0B87B246C93DA87" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Prepaid taxes </link:label>

<link:label id="lab_us-gaap_PrepaidTaxes_8C8CF478DFF7F567E0B87B246C93DA87_label_en-US" xlink:label="lab_us-gaap_PrepaidTaxes_8C8CF478DFF7F567E0B87B246C93DA87" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Prepaid Taxes </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PrepaidTaxes" xlink:label="loc_us-gaap_PrepaidTaxes_8C8CF478DFF7F567E0B87B246C93DA87" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PrepaidTaxes_8C8CF478DFF7F567E0B87B246C93DA87" xlink:to="lab_us-gaap_PrepaidTaxes_8C8CF478DFF7F567E0B87B246C93DA87" xlink:type="arc"/>

<link:label id="lab_us-gaap_DepositsAssetsCurrent_53AB7E466CDA3543E0A77B246C93F126_terseLabel_en-US" xlink:label="lab_us-gaap_DepositsAssetsCurrent_53AB7E466CDA3543E0A77B246C93F126" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Deposits </link:label>

<link:label id="lab_us-gaap_DepositsAssetsCurrent_53AB7E466CDA3543E0A77B246C93F126_label_en-US" xlink:label="lab_us-gaap_DepositsAssetsCurrent_53AB7E466CDA3543E0A77B246C93F126" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deposits Assets, Current </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DepositsAssetsCurrent" xlink:label="loc_us-gaap_DepositsAssetsCurrent_53AB7E466CDA3543E0A77B246C93F126" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DepositsAssetsCurrent_53AB7E466CDA3543E0A77B246C93F126" xlink:to="lab_us-gaap_DepositsAssetsCurrent_53AB7E466CDA3543E0A77B246C93F126" xlink:type="arc"/>

<link:label id="lab_core_RackingAllowancesCurrent_9BD8A7410BB989443AEF7B246C935E4A_terseLabel_en-US" xlink:label="lab_core_RackingAllowancesCurrent_9BD8A7410BB989443AEF7B246C935E4A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Racking allowances, current </link:label>

<link:label id="lab_core_RackingAllowancesCurrent_9BD8A7410BB989443AEF7B246C935E4A_label_en-US" xlink:label="lab_core_RackingAllowancesCurrent_9BD8A7410BB989443AEF7B246C935E4A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Racking Allowances, Current </link:label>

<link:label id="lab_core_RackingAllowancesCurrent_9BD8A7410BB989443AEF7B246C935E4A_documentation_en-US" xlink:label="lab_core_RackingAllowancesCurrent_9BD8A7410BB989443AEF7B246C935E4A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Racking Allowances, Current </link:label>

<link:loc xlink:href="core-20191231.xsd#core_RackingAllowancesCurrent" xlink:label="loc_core_RackingAllowancesCurrent_9BD8A7410BB989443AEF7B246C935E4A" xlink:type="locator"/>

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<link:label id="lab_us-gaap_OtherPrepaidExpenseCurrent_22B7AB44ED87DB3CCE507B246C9375C6_terseLabel_en-US" xlink:label="lab_us-gaap_OtherPrepaidExpenseCurrent_22B7AB44ED87DB3CCE507B246C9375C6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other prepayments </link:label>

<link:label id="lab_us-gaap_OtherPrepaidExpenseCurrent_22B7AB44ED87DB3CCE507B246C9375C6_label_en-US" xlink:label="lab_us-gaap_OtherPrepaidExpenseCurrent_22B7AB44ED87DB3CCE507B246C9375C6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Prepaid Expense, Current </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherPrepaidExpenseCurrent" xlink:label="loc_us-gaap_OtherPrepaidExpenseCurrent_22B7AB44ED87DB3CCE507B246C9375C6" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherPrepaidExpenseCurrent_22B7AB44ED87DB3CCE507B246C9375C6" xlink:to="lab_us-gaap_OtherPrepaidExpenseCurrent_22B7AB44ED87DB3CCE507B246C9375C6" xlink:type="arc"/>

<link:label id="lab_core_DepositsAndPrepaymentsCurrent_2AB874508E4F2BED5F757B246C933A91_totalLabel_en-US" xlink:label="lab_core_DepositsAndPrepaymentsCurrent_2AB874508E4F2BED5F757B246C933A91" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total deposits and prepayments </link:label>

<link:label id="lab_core_DepositsAndPrepaymentsCurrent_2AB874508E4F2BED5F757B246C933A91_label_en-US" xlink:label="lab_core_DepositsAndPrepaymentsCurrent_2AB874508E4F2BED5F757B246C933A91" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deposits and Prepayments, Current </link:label>

<link:label id="lab_core_DepositsAndPrepaymentsCurrent_2AB874508E4F2BED5F757B246C933A91_documentation_en-US" xlink:label="lab_core_DepositsAndPrepaymentsCurrent_2AB874508E4F2BED5F757B246C933A91" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Deposits and Prepayments, Current </link:label>

<link:loc xlink:href="core-20191231.xsd#core_DepositsAndPrepaymentsCurrent" xlink:label="loc_core_DepositsAndPrepaymentsCurrent_2AB874508E4F2BED5F757B246C933A91" xlink:type="locator"/>

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<link:label id="lab_us-gaap_OtherAssetsNoncurrentAbstract_2AAE43008F538BF79E6E7B246C94050B_terseLabel_en-US" xlink:label="lab_us-gaap_OtherAssetsNoncurrentAbstract_2AAE43008F538BF79E6E7B246C94050B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other Assets, Noncurrent [Abstract] </link:label>

<link:label id="lab_us-gaap_OtherAssetsNoncurrentAbstract_2AAE43008F538BF79E6E7B246C94050B_label_en-US" xlink:label="lab_us-gaap_OtherAssetsNoncurrentAbstract_2AAE43008F538BF79E6E7B246C94050B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Assets, Noncurrent [Abstract] </link:label>

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<link:label id="lab_us-gaap_InsuranceSettlementsReceivableNoncurrent_93AC762296CC174667197B246C943BD5_terseLabel_en-US" xlink:label="lab_us-gaap_InsuranceSettlementsReceivableNoncurrent_93AC762296CC174667197B246C943BD5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Insurance recoverables </link:label>

<link:label id="lab_us-gaap_InsuranceSettlementsReceivableNoncurrent_93AC762296CC174667197B246C943BD5_label_en-US" xlink:label="lab_us-gaap_InsuranceSettlementsReceivableNoncurrent_93AC762296CC174667197B246C943BD5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Insurance Settlements Receivable, Noncurrent </link:label>

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<link:label id="lab_core_RackingAllowancesNetNoncurrent_F1BB7DA2A38F8E3200E17B246C949563_terseLabel_en-US" xlink:label="lab_core_RackingAllowancesNetNoncurrent_F1BB7DA2A38F8E3200E17B246C949563" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Racking allowances, net </link:label>

<link:label id="lab_core_RackingAllowancesNetNoncurrent_F1BB7DA2A38F8E3200E17B246C949563_label_en-US" xlink:label="lab_core_RackingAllowancesNetNoncurrent_F1BB7DA2A38F8E3200E17B246C949563" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Racking Allowances, Net, Noncurrent </link:label>

<link:label id="lab_core_RackingAllowancesNetNoncurrent_F1BB7DA2A38F8E3200E17B246C949563_documentation_en-US" xlink:label="lab_core_RackingAllowancesNetNoncurrent_F1BB7DA2A38F8E3200E17B246C949563" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Racking Allowances, Net, Noncurrent </link:label>

<link:loc xlink:href="core-20191231.xsd#core_RackingAllowancesNetNoncurrent" xlink:label="loc_core_RackingAllowancesNetNoncurrent_F1BB7DA2A38F8E3200E17B246C949563" xlink:type="locator"/>

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<link:label id="lab_us-gaap_DepositsAssetsNoncurrent_773C013F674566CA16F67B246C94E00C_terseLabel_en-US" xlink:label="lab_us-gaap_DepositsAssetsNoncurrent_773C013F674566CA16F67B246C94E00C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Insurance deposits </link:label>

<link:label id="lab_us-gaap_DepositsAssetsNoncurrent_773C013F674566CA16F67B246C94E00C_label_en-US" xlink:label="lab_us-gaap_DepositsAssetsNoncurrent_773C013F674566CA16F67B246C94E00C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deposits Assets, Noncurrent </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DepositsAssetsNoncurrent" xlink:label="loc_us-gaap_DepositsAssetsNoncurrent_773C013F674566CA16F67B246C94E00C" xlink:type="locator"/>

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<link:label id="lab_core_UnamortizedDebtIssuanceExpenseNoncurrent_AE2250D06BD774A621417B246C940111_terseLabel_en-US" xlink:label="lab_core_UnamortizedDebtIssuanceExpenseNoncurrent_AE2250D06BD774A621417B246C940111" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Debt issuance costs </link:label>

<link:label id="lab_core_UnamortizedDebtIssuanceExpenseNoncurrent_AE2250D06BD774A621417B246C940111_label_en-US" xlink:label="lab_core_UnamortizedDebtIssuanceExpenseNoncurrent_AE2250D06BD774A621417B246C940111" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Unamortized Debt Issuance Expense, Noncurrent </link:label>

<link:label id="lab_core_UnamortizedDebtIssuanceExpenseNoncurrent_AE2250D06BD774A621417B246C940111_documentation_en-US" xlink:label="lab_core_UnamortizedDebtIssuanceExpenseNoncurrent_AE2250D06BD774A621417B246C940111" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Unamortized Debt Issuance Expense, Noncurrent </link:label>

<link:loc xlink:href="core-20191231.xsd#core_UnamortizedDebtIssuanceExpenseNoncurrent" xlink:label="loc_core_UnamortizedDebtIssuanceExpenseNoncurrent_AE2250D06BD774A621417B246C940111" xlink:type="locator"/>

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<link:label id="lab_us-gaap_OtherAssetsMiscellaneousNoncurrent_63573CFA41607E9C77FA7B246C95B3FA_terseLabel_en-US" xlink:label="lab_us-gaap_OtherAssetsMiscellaneousNoncurrent_63573CFA41607E9C77FA7B246C95B3FA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other assets </link:label>

<link:label id="lab_us-gaap_OtherAssetsMiscellaneousNoncurrent_63573CFA41607E9C77FA7B246C95B3FA_label_en-US" xlink:label="lab_us-gaap_OtherAssetsMiscellaneousNoncurrent_63573CFA41607E9C77FA7B246C95B3FA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Assets, Miscellaneous, Noncurrent </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherAssetsMiscellaneousNoncurrent" xlink:label="loc_us-gaap_OtherAssetsMiscellaneousNoncurrent_63573CFA41607E9C77FA7B246C95B3FA" xlink:type="locator"/>

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<link:label id="lab_us-gaap_OtherAssetsNoncurrent_8102649228E0FEF41E327B246C956427_totalLabel_en-US" xlink:label="lab_us-gaap_OtherAssetsNoncurrent_8102649228E0FEF41E327B246C956427" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total other non-current assets, net </link:label>

<link:label id="lab_us-gaap_OtherAssetsNoncurrent_8102649228E0FEF41E327B246C956427_label_en-US" xlink:label="lab_us-gaap_OtherAssetsNoncurrent_8102649228E0FEF41E327B246C956427" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Assets, Noncurrent </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_8102649228E0FEF41E327B246C956427" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherAssetsNoncurrent_8102649228E0FEF41E327B246C956427" xlink:to="lab_us-gaap_OtherAssetsNoncurrent_8102649228E0FEF41E327B246C956427" xlink:type="arc"/>

<link:label id="lab_us-gaap_AccruedLiabilitiesCurrentAbstract_E7103A4572104029A6DE7B246C9A7615_terseLabel_en-US" xlink:label="lab_us-gaap_AccruedLiabilitiesCurrentAbstract_E7103A4572104029A6DE7B246C9A7615" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accrued Liabilities, Current [Abstract] </link:label>

<link:label id="lab_us-gaap_AccruedLiabilitiesCurrentAbstract_E7103A4572104029A6DE7B246C9A7615_label_en-US" xlink:label="lab_us-gaap_AccruedLiabilitiesCurrentAbstract_E7103A4572104029A6DE7B246C9A7615" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accrued Liabilities, Current [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccruedLiabilitiesCurrentAbstract" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrentAbstract_E7103A4572104029A6DE7B246C9A7615" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrentAbstract_E7103A4572104029A6DE7B246C9A7615" xlink:to="lab_us-gaap_AccruedLiabilitiesCurrentAbstract_E7103A4572104029A6DE7B246C9A7615" xlink:type="arc"/>

<link:label id="lab_us-gaap_EmployeeRelatedLiabilitiesCurrent_7A1786C8179770A97E887B246C9AD25F_terseLabel_en-US" xlink:label="lab_us-gaap_EmployeeRelatedLiabilitiesCurrent_7A1786C8179770A97E887B246C9AD25F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accrued payroll and other benefits </link:label>

<link:label id="lab_us-gaap_EmployeeRelatedLiabilitiesCurrent_7A1786C8179770A97E887B246C9AD25F_label_en-US" xlink:label="lab_us-gaap_EmployeeRelatedLiabilitiesCurrent_7A1786C8179770A97E887B246C9AD25F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Employee-related Liabilities, Current </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_7A1786C8179770A97E887B246C9AD25F" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_7A1786C8179770A97E887B246C9AD25F" xlink:to="lab_us-gaap_EmployeeRelatedLiabilitiesCurrent_7A1786C8179770A97E887B246C9AD25F" xlink:type="arc"/>

<link:label id="lab_core_AccruedCustomerIncentivesPayableCurrent_87C1D5656EF803F1E0637B246C9A4500_terseLabel_en-US" xlink:label="lab_core_AccruedCustomerIncentivesPayableCurrent_87C1D5656EF803F1E0637B246C9A4500" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accrued customer incentives payable </link:label>

<link:label id="lab_core_AccruedCustomerIncentivesPayableCurrent_87C1D5656EF803F1E0637B246C9A4500_label_en-US" xlink:label="lab_core_AccruedCustomerIncentivesPayableCurrent_87C1D5656EF803F1E0637B246C9A4500" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accrued Customer Incentives Payable, Current </link:label>

<link:label id="lab_core_AccruedCustomerIncentivesPayableCurrent_87C1D5656EF803F1E0637B246C9A4500_documentation_en-US" xlink:label="lab_core_AccruedCustomerIncentivesPayableCurrent_87C1D5656EF803F1E0637B246C9A4500" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Accrued Customer Incentives Payable, Current </link:label>

<link:loc xlink:href="core-20191231.xsd#core_AccruedCustomerIncentivesPayableCurrent" xlink:label="loc_core_AccruedCustomerIncentivesPayableCurrent_87C1D5656EF803F1E0637B246C9A4500" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_AccruedCustomerIncentivesPayableCurrent_87C1D5656EF803F1E0637B246C9A4500" xlink:to="lab_core_AccruedCustomerIncentivesPayableCurrent_87C1D5656EF803F1E0637B246C9A4500" xlink:type="arc"/>

<link:label id="lab_core_LiabilityForClaimsAndClaimsAdjustmentExpenseShortTerm_436EA7E84D28F4B47DB47B246C9A506A_verboseLabel_en-US" xlink:label="lab_core_LiabilityForClaimsAndClaimsAdjustmentExpenseShortTerm_436EA7E84D28F4B47DB47B246C9A506A" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Claims liabilities, current </link:label>

<link:label id="lab_core_LiabilityForClaimsAndClaimsAdjustmentExpenseShortTerm_436EA7E84D28F4B47DB47B246C9A506A_label_en-US" xlink:label="lab_core_LiabilityForClaimsAndClaimsAdjustmentExpenseShortTerm_436EA7E84D28F4B47DB47B246C9A506A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Liability for Claims and Claims Adjustment Expense, Short-Term </link:label>

<link:label id="lab_core_LiabilityForClaimsAndClaimsAdjustmentExpenseShortTerm_436EA7E84D28F4B47DB47B246C9A506A_documentation_en-US" xlink:label="lab_core_LiabilityForClaimsAndClaimsAdjustmentExpenseShortTerm_436EA7E84D28F4B47DB47B246C9A506A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Liability for Claims and Claims Adjustment Expense, Short-Term </link:label>

<link:loc xlink:href="core-20191231.xsd#core_LiabilityForClaimsAndClaimsAdjustmentExpenseShortTerm" xlink:label="loc_core_LiabilityForClaimsAndClaimsAdjustmentExpenseShortTerm_436EA7E84D28F4B47DB47B246C9A506A" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_LiabilityForClaimsAndClaimsAdjustmentExpenseShortTerm_436EA7E84D28F4B47DB47B246C9A506A" xlink:to="lab_core_LiabilityForClaimsAndClaimsAdjustmentExpenseShortTerm_436EA7E84D28F4B47DB47B246C9A506A" xlink:type="arc"/>

<link:label id="lab_us-gaap_TaxesPayableCurrent_5F53BAFA379C150E387E7B246C9B6373_terseLabel_en-US" xlink:label="lab_us-gaap_TaxesPayableCurrent_5F53BAFA379C150E387E7B246C9B6373" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Indirect taxes </link:label>

<link:label id="lab_us-gaap_TaxesPayableCurrent_5F53BAFA379C150E387E7B246C9B6373_label_en-US" xlink:label="lab_us-gaap_TaxesPayableCurrent_5F53BAFA379C150E387E7B246C9B6373" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Taxes Payable, Current </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TaxesPayableCurrent" xlink:label="loc_us-gaap_TaxesPayableCurrent_5F53BAFA379C150E387E7B246C9B6373" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_TaxesPayableCurrent_5F53BAFA379C150E387E7B246C9B6373" xlink:to="lab_us-gaap_TaxesPayableCurrent_5F53BAFA379C150E387E7B246C9B6373" xlink:type="arc"/>

<link:label id="lab_core_VendorAdvancesCurrent_826C210DEE74E4D453DC7B246C9B2529_terseLabel_en-US" xlink:label="lab_core_VendorAdvancesCurrent_826C210DEE74E4D453DC7B246C9B2529" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Vendor advances </link:label>

<link:label id="lab_core_VendorAdvancesCurrent_826C210DEE74E4D453DC7B246C9B2529_label_en-US" xlink:label="lab_core_VendorAdvancesCurrent_826C210DEE74E4D453DC7B246C9B2529" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Vendor Advances, Current </link:label>

<link:label id="lab_core_VendorAdvancesCurrent_826C210DEE74E4D453DC7B246C9B2529_documentation_en-US" xlink:label="lab_core_VendorAdvancesCurrent_826C210DEE74E4D453DC7B246C9B2529" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Vendor Advances, Current </link:label>

<link:loc xlink:href="core-20191231.xsd#core_VendorAdvancesCurrent" xlink:label="loc_core_VendorAdvancesCurrent_826C210DEE74E4D453DC7B246C9B2529" xlink:type="locator"/>

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<link:label id="lab_us-gaap_OtherAccruedLiabilitiesCurrent_6DFFB992D85770A4E6117B246C9BDC5B_terseLabel_en-US" xlink:label="lab_us-gaap_OtherAccruedLiabilitiesCurrent_6DFFB992D85770A4E6117B246C9BDC5B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other accrued expenses </link:label>

<link:label id="lab_us-gaap_OtherAccruedLiabilitiesCurrent_6DFFB992D85770A4E6117B246C9BDC5B_label_en-US" xlink:label="lab_us-gaap_OtherAccruedLiabilitiesCurrent_6DFFB992D85770A4E6117B246C9BDC5B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Accrued Liabilities, Current </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherAccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_OtherAccruedLiabilitiesCurrent_6DFFB992D85770A4E6117B246C9BDC5B" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherAccruedLiabilitiesCurrent_6DFFB992D85770A4E6117B246C9BDC5B" xlink:to="lab_us-gaap_OtherAccruedLiabilitiesCurrent_6DFFB992D85770A4E6117B246C9BDC5B" xlink:type="arc"/>

<link:label id="lab_us-gaap_AccruedLiabilitiesCurrent_2AFC82EA38B75268560E7B246C9BC87A_totalLabel_en-US" xlink:label="lab_us-gaap_AccruedLiabilitiesCurrent_2AFC82EA38B75268560E7B246C9BC87A" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total accrued liabilities </link:label>

<link:label id="lab_us-gaap_AccruedLiabilitiesCurrent_2AFC82EA38B75268560E7B246C9BC87A_label_en-US" xlink:label="lab_us-gaap_AccruedLiabilitiesCurrent_2AFC82EA38B75268560E7B246C9BC87A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accrued Liabilities, Current </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_2AFC82EA38B75268560E7B246C9BC87A" xlink:type="locator"/>

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<link:label id="lab_us-gaap_StockholdersEquityNoteDisclosureTextBlock_967BACB1ABA4ED0EE2BA75B59A6BD861_terseLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquityNoteDisclosureTextBlock_967BACB1ABA4ED0EE2BA75B59A6BD861" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Stockholders' Equity </link:label>

<link:label id="lab_us-gaap_StockholdersEquityNoteDisclosureTextBlock_967BACB1ABA4ED0EE2BA75B59A6BD861_label_en-US" xlink:label="lab_us-gaap_StockholdersEquityNoteDisclosureTextBlock_967BACB1ABA4ED0EE2BA75B59A6BD861" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Stockholders' Equity Note Disclosure [Text Block] </link:label>

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<link:label id="lab_us-gaap_InventoryDisclosureAbstract_7CF5BF6349156EE7CA2175B59B6601EA_label_en-US" xlink:label="lab_us-gaap_InventoryDisclosureAbstract_7CF5BF6349156EE7CA2175B59B6601EA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Inventory Disclosure [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InventoryDisclosureAbstract" xlink:label="loc_us-gaap_InventoryDisclosureAbstract_7CF5BF6349156EE7CA2175B59B6601EA" xlink:type="locator"/>

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<link:label id="lab_us-gaap_ScheduleOfInventoryCurrentTableTextBlock_8B861ECEBA69AE241F3375B59B669CCA_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfInventoryCurrentTableTextBlock_8B861ECEBA69AE241F3375B59B669CCA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Inventories </link:label>

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<link:label id="lab_us-gaap_AllowanceForCreditLossMember_36FB922058F499F4BDFC8E6A591C0EE1_terseLabel_en-US" xlink:label="lab_us-gaap_AllowanceForCreditLossMember_36FB922058F499F4BDFC8E6A591C0EE1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Trade receivables </link:label>

<link:label id="lab_us-gaap_AllowanceForCreditLossMember_36FB922058F499F4BDFC8E6A591C0EE1_label_en-US" xlink:label="lab_us-gaap_AllowanceForCreditLossMember_36FB922058F499F4BDFC8E6A591C0EE1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> SEC Schedule, 12-09, Allowance, Credit Loss [Member] </link:label>

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<link:label id="lab_us-gaap_ComponentsOfDeferredTaxLiabilitiesAbstract_3DDCB3522DB266C98CC775B59ACD6B71_terseLabel_en-US" xlink:label="lab_us-gaap_ComponentsOfDeferredTaxLiabilitiesAbstract_3DDCB3522DB266C98CC775B59ACD6B71" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Deferred tax liabilities: </link:label>

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<link:label id="lab_dei_EntityAddressCityOrTown_80E770FC4010DDDD97EE8CCC80CF1E51_terseLabel_en-US" xlink:label="lab_dei_EntityAddressCityOrTown_80E770FC4010DDDD97EE8CCC80CF1E51" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Address, City or Town </link:label>

<link:label id="lab_dei_EntityAddressCityOrTown_80E770FC4010DDDD97EE8CCC80CF1E51_label_en-US" xlink:label="lab_dei_EntityAddressCityOrTown_80E770FC4010DDDD97EE8CCC80CF1E51" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Address, City or Town </link:label>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressCityOrTown" xlink:label="loc_dei_EntityAddressCityOrTown_80E770FC4010DDDD97EE8CCC80CF1E51" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressCityOrTown_80E770FC4010DDDD97EE8CCC80CF1E51" xlink:to="lab_dei_EntityAddressCityOrTown_80E770FC4010DDDD97EE8CCC80CF1E51" xlink:type="arc"/>

<link:label id="lab_dei_EntityAddressStateOrProvince_7967C16A9640AC4AE6FF8CCC80CF948B_terseLabel_en-US" xlink:label="lab_dei_EntityAddressStateOrProvince_7967C16A9640AC4AE6FF8CCC80CF948B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Address, State or Province </link:label>

<link:label id="lab_dei_EntityAddressStateOrProvince_7967C16A9640AC4AE6FF8CCC80CF948B_label_en-US" xlink:label="lab_dei_EntityAddressStateOrProvince_7967C16A9640AC4AE6FF8CCC80CF948B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Address, State or Province </link:label>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressStateOrProvince" xlink:label="loc_dei_EntityAddressStateOrProvince_7967C16A9640AC4AE6FF8CCC80CF948B" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityAddressStateOrProvince_7967C16A9640AC4AE6FF8CCC80CF948B" xlink:to="lab_dei_EntityAddressStateOrProvince_7967C16A9640AC4AE6FF8CCC80CF948B" xlink:type="arc"/>

<link:label id="lab_dei_CityAreaCode_8A864F6BBAAAFB7364AC8CCC80CF0D15_terseLabel_en-US" xlink:label="lab_dei_CityAreaCode_8A864F6BBAAAFB7364AC8CCC80CF0D15" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> City Area Code </link:label>

<link:label id="lab_dei_CityAreaCode_8A864F6BBAAAFB7364AC8CCC80CF0D15_label_en-US" xlink:label="lab_dei_CityAreaCode_8A864F6BBAAAFB7364AC8CCC80CF0D15" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> City Area Code </link:label>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_CityAreaCode" xlink:label="loc_dei_CityAreaCode_8A864F6BBAAAFB7364AC8CCC80CF0D15" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_CityAreaCode_8A864F6BBAAAFB7364AC8CCC80CF0D15" xlink:to="lab_dei_CityAreaCode_8A864F6BBAAAFB7364AC8CCC80CF0D15" xlink:type="arc"/>

<link:label id="lab_dei_LocalPhoneNumber_E78F0416DDBBF0ACCC688CCC80CFD1F6_terseLabel_en-US" xlink:label="lab_dei_LocalPhoneNumber_E78F0416DDBBF0ACCC688CCC80CFD1F6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Local Phone Number </link:label>

<link:label id="lab_dei_LocalPhoneNumber_E78F0416DDBBF0ACCC688CCC80CFD1F6_label_en-US" xlink:label="lab_dei_LocalPhoneNumber_E78F0416DDBBF0ACCC688CCC80CFD1F6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Local Phone Number </link:label>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_LocalPhoneNumber" xlink:label="loc_dei_LocalPhoneNumber_E78F0416DDBBF0ACCC688CCC80CFD1F6" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_LocalPhoneNumber_E78F0416DDBBF0ACCC688CCC80CFD1F6" xlink:to="lab_dei_LocalPhoneNumber_E78F0416DDBBF0ACCC688CCC80CFD1F6" xlink:type="arc"/>

<link:label id="lab_dei_Security12bTitle_07A84E488633C8CF0CC48CCC80CF0469_terseLabel_en-US" xlink:label="lab_dei_Security12bTitle_07A84E488633C8CF0CC48CCC80CF0469" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Title of 12(b) Security </link:label>

<link:label id="lab_dei_Security12bTitle_07A84E488633C8CF0CC48CCC80CF0469_label_en-US" xlink:label="lab_dei_Security12bTitle_07A84E488633C8CF0CC48CCC80CF0469" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Title of 12(b) Security </link:label>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_Security12bTitle" xlink:label="loc_dei_Security12bTitle_07A84E488633C8CF0CC48CCC80CF0469" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_Security12bTitle_07A84E488633C8CF0CC48CCC80CF0469" xlink:to="lab_dei_Security12bTitle_07A84E488633C8CF0CC48CCC80CF0469" xlink:type="arc"/>

<link:label id="lab_dei_TradingSymbol_15BC2A4870D34AC27EC48CCC80D1162B_terseLabel_en-US" xlink:label="lab_dei_TradingSymbol_15BC2A4870D34AC27EC48CCC80D1162B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Trading Symbol </link:label>

<link:label id="lab_dei_TradingSymbol_15BC2A4870D34AC27EC48CCC80D1162B_label_en-US" xlink:label="lab_dei_TradingSymbol_15BC2A4870D34AC27EC48CCC80D1162B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Trading Symbol </link:label>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_TradingSymbol" xlink:label="loc_dei_TradingSymbol_15BC2A4870D34AC27EC48CCC80D1162B" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_TradingSymbol_15BC2A4870D34AC27EC48CCC80D1162B" xlink:to="lab_dei_TradingSymbol_15BC2A4870D34AC27EC48CCC80D1162B" xlink:type="arc"/>

<link:label id="lab_dei_SecurityExchangeName_1EF3F41573FAE2182A6C8CCC80D1AF0C_terseLabel_en-US" xlink:label="lab_dei_SecurityExchangeName_1EF3F41573FAE2182A6C8CCC80D1AF0C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Security Exchange Name </link:label>

<link:label id="lab_dei_SecurityExchangeName_1EF3F41573FAE2182A6C8CCC80D1AF0C_label_en-US" xlink:label="lab_dei_SecurityExchangeName_1EF3F41573FAE2182A6C8CCC80D1AF0C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Security Exchange Name </link:label>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_SecurityExchangeName" xlink:label="loc_dei_SecurityExchangeName_1EF3F41573FAE2182A6C8CCC80D1AF0C" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_SecurityExchangeName_1EF3F41573FAE2182A6C8CCC80D1AF0C" xlink:to="lab_dei_SecurityExchangeName_1EF3F41573FAE2182A6C8CCC80D1AF0C" xlink:type="arc"/>

<link:label id="lab_dei_EntityWellKnownSeasonedIssuer_E8213B4350E31C91593B8CCC80D1A465_terseLabel_en-US" xlink:label="lab_dei_EntityWellKnownSeasonedIssuer_E8213B4350E31C91593B8CCC80D1A465" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Well-known Seasoned Issuer </link:label>

<link:label id="lab_dei_EntityWellKnownSeasonedIssuer_E8213B4350E31C91593B8CCC80D1A465_label_en-US" xlink:label="lab_dei_EntityWellKnownSeasonedIssuer_E8213B4350E31C91593B8CCC80D1A465" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Well-known Seasoned Issuer </link:label>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityWellKnownSeasonedIssuer" xlink:label="loc_dei_EntityWellKnownSeasonedIssuer_E8213B4350E31C91593B8CCC80D1A465" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityWellKnownSeasonedIssuer_E8213B4350E31C91593B8CCC80D1A465" xlink:to="lab_dei_EntityWellKnownSeasonedIssuer_E8213B4350E31C91593B8CCC80D1A465" xlink:type="arc"/>

<link:label id="lab_dei_EntityVoluntaryFilers_921FEE3F66162D350A318CCC80D18BE2_terseLabel_en-US" xlink:label="lab_dei_EntityVoluntaryFilers_921FEE3F66162D350A318CCC80D18BE2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Voluntary Filers </link:label>

<link:label id="lab_dei_EntityVoluntaryFilers_921FEE3F66162D350A318CCC80D18BE2_label_en-US" xlink:label="lab_dei_EntityVoluntaryFilers_921FEE3F66162D350A318CCC80D18BE2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Voluntary Filers </link:label>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityVoluntaryFilers" xlink:label="loc_dei_EntityVoluntaryFilers_921FEE3F66162D350A318CCC80D18BE2" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityVoluntaryFilers_921FEE3F66162D350A318CCC80D18BE2" xlink:to="lab_dei_EntityVoluntaryFilers_921FEE3F66162D350A318CCC80D18BE2" xlink:type="arc"/>

<link:label id="lab_dei_EntityCurrentReportingStatus_E6C8F72CED6D213115318CCC80D19524_terseLabel_en-US" xlink:label="lab_dei_EntityCurrentReportingStatus_E6C8F72CED6D213115318CCC80D19524" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Current Reporting Status </link:label>

<link:label id="lab_dei_EntityCurrentReportingStatus_E6C8F72CED6D213115318CCC80D19524_label_en-US" xlink:label="lab_dei_EntityCurrentReportingStatus_E6C8F72CED6D213115318CCC80D19524" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Current Reporting Status </link:label>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityCurrentReportingStatus" xlink:label="loc_dei_EntityCurrentReportingStatus_E6C8F72CED6D213115318CCC80D19524" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityCurrentReportingStatus_E6C8F72CED6D213115318CCC80D19524" xlink:to="lab_dei_EntityCurrentReportingStatus_E6C8F72CED6D213115318CCC80D19524" xlink:type="arc"/>

<link:label id="lab_dei_EntityInteractiveDataCurrent_A4A3BAB5D671A3E2B9038CCC80D14FC8_terseLabel_en-US" xlink:label="lab_dei_EntityInteractiveDataCurrent_A4A3BAB5D671A3E2B9038CCC80D14FC8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Interactive Data Current </link:label>

<link:label id="lab_dei_EntityInteractiveDataCurrent_A4A3BAB5D671A3E2B9038CCC80D14FC8_label_en-US" xlink:label="lab_dei_EntityInteractiveDataCurrent_A4A3BAB5D671A3E2B9038CCC80D14FC8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Interactive Data Current </link:label>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityInteractiveDataCurrent" xlink:label="loc_dei_EntityInteractiveDataCurrent_A4A3BAB5D671A3E2B9038CCC80D14FC8" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityInteractiveDataCurrent_A4A3BAB5D671A3E2B9038CCC80D14FC8" xlink:to="lab_dei_EntityInteractiveDataCurrent_A4A3BAB5D671A3E2B9038CCC80D14FC8" xlink:type="arc"/>

<link:label id="lab_dei_EntityFilerCategory_B7ECE01C4347C49F9DC98CCC80D1B774_terseLabel_en-US" xlink:label="lab_dei_EntityFilerCategory_B7ECE01C4347C49F9DC98CCC80D1B774" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Filer Category </link:label>

<link:label id="lab_dei_EntityFilerCategory_B7ECE01C4347C49F9DC98CCC80D1B774_label_en-US" xlink:label="lab_dei_EntityFilerCategory_B7ECE01C4347C49F9DC98CCC80D1B774" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Filer Category </link:label>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityFilerCategory" xlink:label="loc_dei_EntityFilerCategory_B7ECE01C4347C49F9DC98CCC80D1B774" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityFilerCategory_B7ECE01C4347C49F9DC98CCC80D1B774" xlink:to="lab_dei_EntityFilerCategory_B7ECE01C4347C49F9DC98CCC80D1B774" xlink:type="arc"/>

<link:label id="lab_dei_EntitySmallBusiness_46C9D53780C1A91FB09C8CCC80D2AEB6_terseLabel_en-US" xlink:label="lab_dei_EntitySmallBusiness_46C9D53780C1A91FB09C8CCC80D2AEB6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Small Business </link:label>

<link:label id="lab_dei_EntitySmallBusiness_46C9D53780C1A91FB09C8CCC80D2AEB6_label_en-US" xlink:label="lab_dei_EntitySmallBusiness_46C9D53780C1A91FB09C8CCC80D2AEB6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Small Business </link:label>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntitySmallBusiness" xlink:label="loc_dei_EntitySmallBusiness_46C9D53780C1A91FB09C8CCC80D2AEB6" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntitySmallBusiness_46C9D53780C1A91FB09C8CCC80D2AEB6" xlink:to="lab_dei_EntitySmallBusiness_46C9D53780C1A91FB09C8CCC80D2AEB6" xlink:type="arc"/>

<link:label id="lab_dei_EntityEmergingGrowthCompany_0AD863948576BEB66F878CCC80D2B238_terseLabel_en-US" xlink:label="lab_dei_EntityEmergingGrowthCompany_0AD863948576BEB66F878CCC80D2B238" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Emerging Growth Company </link:label>

<link:label id="lab_dei_EntityEmergingGrowthCompany_0AD863948576BEB66F878CCC80D2B238_label_en-US" xlink:label="lab_dei_EntityEmergingGrowthCompany_0AD863948576BEB66F878CCC80D2B238" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Emerging Growth Company </link:label>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityEmergingGrowthCompany" xlink:label="loc_dei_EntityEmergingGrowthCompany_0AD863948576BEB66F878CCC80D2B238" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityEmergingGrowthCompany_0AD863948576BEB66F878CCC80D2B238" xlink:to="lab_dei_EntityEmergingGrowthCompany_0AD863948576BEB66F878CCC80D2B238" xlink:type="arc"/>

<link:label id="lab_dei_EntityShellCompany_82A2F918E33E343E19EB8CCC80D27B2C_terseLabel_en-US" xlink:label="lab_dei_EntityShellCompany_82A2F918E33E343E19EB8CCC80D27B2C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Shell Company </link:label>

<link:label id="lab_dei_EntityShellCompany_82A2F918E33E343E19EB8CCC80D27B2C_label_en-US" xlink:label="lab_dei_EntityShellCompany_82A2F918E33E343E19EB8CCC80D27B2C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Shell Company </link:label>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityShellCompany" xlink:label="loc_dei_EntityShellCompany_82A2F918E33E343E19EB8CCC80D27B2C" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityShellCompany_82A2F918E33E343E19EB8CCC80D27B2C" xlink:to="lab_dei_EntityShellCompany_82A2F918E33E343E19EB8CCC80D27B2C" xlink:type="arc"/>

<link:label id="lab_dei_EntityPublicFloat_3DCA195BB160172402898CCC80D250ED_terseLabel_en-US" xlink:label="lab_dei_EntityPublicFloat_3DCA195BB160172402898CCC80D250ED" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Public Float </link:label>

<link:label id="lab_dei_EntityPublicFloat_3DCA195BB160172402898CCC80D250ED_label_en-US" xlink:label="lab_dei_EntityPublicFloat_3DCA195BB160172402898CCC80D250ED" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Public Float </link:label>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityPublicFloat" xlink:label="loc_dei_EntityPublicFloat_3DCA195BB160172402898CCC80D250ED" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityPublicFloat_3DCA195BB160172402898CCC80D250ED" xlink:to="lab_dei_EntityPublicFloat_3DCA195BB160172402898CCC80D250ED" xlink:type="arc"/>

<link:label id="lab_dei_EntityCommonStockSharesOutstanding_487D7BDB12847BF912F88CCC80D234AC_terseLabel_en-US" xlink:label="lab_dei_EntityCommonStockSharesOutstanding_487D7BDB12847BF912F88CCC80D234AC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Common Stock, Shares Outstanding </link:label>

<link:label id="lab_dei_EntityCommonStockSharesOutstanding_487D7BDB12847BF912F88CCC80D234AC_label_en-US" xlink:label="lab_dei_EntityCommonStockSharesOutstanding_487D7BDB12847BF912F88CCC80D234AC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Common Stock, Shares Outstanding </link:label>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityCommonStockSharesOutstanding" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_487D7BDB12847BF912F88CCC80D234AC" xlink:type="locator"/>

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<link:loc xlink:href="core-20191231.xsd#core_BeveragesMember" xlink:label="loc_core_BeveragesMember_3074F5C088082348C54975B59A316ADE" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_BeveragesMember_3074F5C088082348C54975B59A316ADE" xlink:to="lab_core_BeveragesMember_3074F5C088082348C54975B59A316ADE" xlink:type="arc"/>

<link:label id="lab_core_EquipmentOtherMember_7B3FD2AEC833FAD26ACC75B59A3180FC_terseLabel_en-US" xlink:label="lab_core_EquipmentOtherMember_7B3FD2AEC833FAD26ACC75B59A3180FC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Equipment/other </link:label>

<link:label id="lab_core_EquipmentOtherMember_7B3FD2AEC833FAD26ACC75B59A3180FC_label_en-US" xlink:label="lab_core_EquipmentOtherMember_7B3FD2AEC833FAD26ACC75B59A3180FC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Equipment Other [Member] </link:label>

<link:label id="lab_core_EquipmentOtherMember_7B3FD2AEC833FAD26ACC75B59A3180FC_documentation_en-US" xlink:label="lab_core_EquipmentOtherMember_7B3FD2AEC833FAD26ACC75B59A3180FC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Equipment/other product category [Member] </link:label>

<link:loc xlink:href="core-20191231.xsd#core_EquipmentOtherMember" xlink:label="loc_core_EquipmentOtherMember_7B3FD2AEC833FAD26ACC75B59A3180FC" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_EquipmentOtherMember_7B3FD2AEC833FAD26ACC75B59A3180FC" xlink:to="lab_core_EquipmentOtherMember_7B3FD2AEC833FAD26ACC75B59A3180FC" xlink:type="arc"/>

<link:label id="lab_us-gaap_BusinessAcquisitionsProFormaRevenue_3C2EBEDDA1290596BF4075B59B848939_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionsProFormaRevenue_3C2EBEDDA1290596BF4075B59B848939" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Net sales </link:label>

<link:label id="lab_us-gaap_BusinessAcquisitionsProFormaRevenue_3C2EBEDDA1290596BF4075B59B848939_label_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionsProFormaRevenue_3C2EBEDDA1290596BF4075B59B848939" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Business Acquisition, Pro Forma Revenue </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessAcquisitionsProFormaRevenue" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_3C2EBEDDA1290596BF4075B59B848939" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_3C2EBEDDA1290596BF4075B59B848939" xlink:to="lab_us-gaap_BusinessAcquisitionsProFormaRevenue_3C2EBEDDA1290596BF4075B59B848939" xlink:type="arc"/>

<link:label id="lab_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_494486F538E40C61341675B59B85FFC4_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_494486F538E40C61341675B59B85FFC4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Net income </link:label>

<link:label id="lab_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_494486F538E40C61341675B59B85FFC4_label_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_494486F538E40C61341675B59B85FFC4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Business Acquisition, Pro Forma Net Income (Loss) </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_494486F538E40C61341675B59B85FFC4" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_494486F538E40C61341675B59B85FFC4" xlink:to="lab_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_494486F538E40C61341675B59B85FFC4" xlink:type="arc"/>

<link:label id="lab_us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic_D798A5452E7095B5572175B59B8562CF_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic_D798A5452E7095B5572175B59B8562CF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Basic and diluted earnings per share (USD per share) </link:label>

<link:label id="lab_us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic_D798A5452E7095B5572175B59B8562CF_label_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic_D798A5452E7095B5572175B59B8562CF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Business Acquisition, Pro Forma Earnings Per Share, Basic </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic" xlink:label="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic_D798A5452E7095B5572175B59B8562CF" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic_D798A5452E7095B5572175B59B8562CF" xlink:to="lab_us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic_D798A5452E7095B5572175B59B8562CF" xlink:type="arc"/>

<link:label id="lab_us-gaap_ComprehensiveIncomeNoteTextBlock_DD59A4344DDB6DEF0EC275B59A5CBA0B_terseLabel_en-US" xlink:label="lab_us-gaap_ComprehensiveIncomeNoteTextBlock_DD59A4344DDB6DEF0EC275B59A5CBA0B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other Comprehensive Income (Loss) </link:label>

<link:label id="lab_us-gaap_ComprehensiveIncomeNoteTextBlock_DD59A4344DDB6DEF0EC275B59A5CBA0B_label_en-US" xlink:label="lab_us-gaap_ComprehensiveIncomeNoteTextBlock_DD59A4344DDB6DEF0EC275B59A5CBA0B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Comprehensive Income (Loss) Note [Text Block] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ComprehensiveIncomeNoteTextBlock" xlink:label="loc_us-gaap_ComprehensiveIncomeNoteTextBlock_DD59A4344DDB6DEF0EC275B59A5CBA0B" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ComprehensiveIncomeNoteTextBlock_DD59A4344DDB6DEF0EC275B59A5CBA0B" xlink:to="lab_us-gaap_ComprehensiveIncomeNoteTextBlock_DD59A4344DDB6DEF0EC275B59A5CBA0B" xlink:type="arc"/>

<link:label id="lab_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardForfeitureRateSinceInceptionOfPlans_8D74266D6DAA8D46776A75B59BCF0C45_terseLabel_en-US" xlink:label="lab_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardForfeitureRateSinceInceptionOfPlans_8D74266D6DAA8D46776A75B59BCF0C45" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Forfeiture rate since inception of plans </link:label>

<link:label id="lab_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardForfeitureRateSinceInceptionOfPlans_8D74266D6DAA8D46776A75B59BCF0C45_label_en-US" xlink:label="lab_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardForfeitureRateSinceInceptionOfPlans_8D74266D6DAA8D46776A75B59BCF0C45" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Forfeiture Rate Since Inception of Plans </link:label>

<link:label id="lab_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardForfeitureRateSinceInceptionOfPlans_8D74266D6DAA8D46776A75B59BCF0C45_documentation_en-US" xlink:label="lab_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardForfeitureRateSinceInceptionOfPlans_8D74266D6DAA8D46776A75B59BCF0C45" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Forfeiture Rate Since Inception of Plans </link:label>

<link:loc xlink:href="core-20191231.xsd#core_ShareBasedCompensationArrangementByShareBasedPaymentAwardForfeitureRateSinceInceptionOfPlans" xlink:label="loc_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardForfeitureRateSinceInceptionOfPlans_8D74266D6DAA8D46776A75B59BCF0C45" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardForfeitureRateSinceInceptionOfPlans_8D74266D6DAA8D46776A75B59BCF0C45" xlink:to="lab_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardForfeitureRateSinceInceptionOfPlans_8D74266D6DAA8D46776A75B59BCF0C45" xlink:type="arc"/>

<link:label id="lab_us-gaap_CompensationAndRetirementDisclosureAbstract_16DFE95A72BD4811B0ED75B59ABFCA91_label_en-US" xlink:label="lab_us-gaap_CompensationAndRetirementDisclosureAbstract_16DFE95A72BD4811B0ED75B59ABFCA91" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Retirement Benefits [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_16DFE95A72BD4811B0ED75B59ABFCA91" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_16DFE95A72BD4811B0ED75B59ABFCA91" xlink:to="lab_us-gaap_CompensationAndRetirementDisclosureAbstract_16DFE95A72BD4811B0ED75B59ABFCA91" xlink:type="arc"/>

<link:label id="lab_us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock_F72D43604F49D0D320BC75B59ABF5454_terseLabel_en-US" xlink:label="lab_us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock_F72D43604F49D0D320BC75B59ABF5454" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Employee Benefit Plans </link:label>

<link:label id="lab_us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock_F72D43604F49D0D320BC75B59ABF5454_label_en-US" xlink:label="lab_us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock_F72D43604F49D0D320BC75B59ABF5454" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Pension and Other Postretirement Benefits Disclosure [Text Block] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock" xlink:label="loc_us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock_F72D43604F49D0D320BC75B59ABF5454" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock_F72D43604F49D0D320BC75B59ABF5454" xlink:to="lab_us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock_F72D43604F49D0D320BC75B59ABF5454" xlink:type="arc"/>

<link:label id="lab_core_AssetsAndLiabilitiesLesseeTableTextBlock_1B3C6124FD9D75504AE875B59B4BECC2_terseLabel_en-US" xlink:label="lab_core_AssetsAndLiabilitiesLesseeTableTextBlock_1B3C6124FD9D75504AE875B59B4BECC2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Assets And Liabilities, Lessee </link:label>

<link:label id="lab_core_AssetsAndLiabilitiesLesseeTableTextBlock_1B3C6124FD9D75504AE875B59B4BECC2_label_en-US" xlink:label="lab_core_AssetsAndLiabilitiesLesseeTableTextBlock_1B3C6124FD9D75504AE875B59B4BECC2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Assets And Liabilities, Lessee [Table Text Block] </link:label>

<link:label id="lab_core_AssetsAndLiabilitiesLesseeTableTextBlock_1B3C6124FD9D75504AE875B59B4BECC2_documentation_en-US" xlink:label="lab_core_AssetsAndLiabilitiesLesseeTableTextBlock_1B3C6124FD9D75504AE875B59B4BECC2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> [Table Text Block] for Assets And Liabilities, Lessee [Table] </link:label>

<link:loc xlink:href="core-20191231.xsd#core_AssetsAndLiabilitiesLesseeTableTextBlock" xlink:label="loc_core_AssetsAndLiabilitiesLesseeTableTextBlock_1B3C6124FD9D75504AE875B59B4BECC2" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_AssetsAndLiabilitiesLesseeTableTextBlock_1B3C6124FD9D75504AE875B59B4BECC2" xlink:to="lab_core_AssetsAndLiabilitiesLesseeTableTextBlock_1B3C6124FD9D75504AE875B59B4BECC2" xlink:type="arc"/>

<link:label id="lab_us-gaap_LeaseCostTableTextBlock_E36701E0F610E45BF84B75B59B4B258E_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseCostTableTextBlock_E36701E0F610E45BF84B75B59B4B258E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Lease Cost </link:label>

<link:label id="lab_us-gaap_LeaseCostTableTextBlock_E36701E0F610E45BF84B75B59B4B258E_label_en-US" xlink:label="lab_us-gaap_LeaseCostTableTextBlock_E36701E0F610E45BF84B75B59B4B258E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lease, Cost [Table Text Block] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LeaseCostTableTextBlock" xlink:label="loc_us-gaap_LeaseCostTableTextBlock_E36701E0F610E45BF84B75B59B4B258E" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LeaseCostTableTextBlock_E36701E0F610E45BF84B75B59B4B258E" xlink:to="lab_us-gaap_LeaseCostTableTextBlock_E36701E0F610E45BF84B75B59B4B258E" xlink:type="arc"/>

<link:label id="lab_us-gaap_FinanceLeaseLiabilityMaturityTableTextBlock_C4D153D6DB69BD635FAC75B59B4C3048_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityMaturityTableTextBlock_C4D153D6DB69BD635FAC75B59B4C3048" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Maturity of Lease Liabilities </link:label>

<link:label id="lab_us-gaap_FinanceLeaseLiabilityMaturityTableTextBlock_C4D153D6DB69BD635FAC75B59B4C3048_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityMaturityTableTextBlock_C4D153D6DB69BD635FAC75B59B4C3048" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finance Lease, Liability, Maturity [Table Text Block] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityMaturityTableTextBlock" xlink:label="loc_us-gaap_FinanceLeaseLiabilityMaturityTableTextBlock_C4D153D6DB69BD635FAC75B59B4C3048" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityMaturityTableTextBlock_C4D153D6DB69BD635FAC75B59B4C3048" xlink:to="lab_us-gaap_FinanceLeaseLiabilityMaturityTableTextBlock_C4D153D6DB69BD635FAC75B59B4C3048" xlink:type="arc"/>

<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_8370DB5DA1DCCEEB838A75B59B4C37E0_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_8370DB5DA1DCCEEB838A75B59B4C37E0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Maturity of Lease Liabilities </link:label>

<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_8370DB5DA1DCCEEB838A75B59B4C37E0_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_8370DB5DA1DCCEEB838A75B59B4C37E0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Liability, Maturity [Table Text Block] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_8370DB5DA1DCCEEB838A75B59B4C37E0" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_8370DB5DA1DCCEEB838A75B59B4C37E0" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_8370DB5DA1DCCEEB838A75B59B4C37E0" xlink:type="arc"/>

<link:label id="lab_us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock_EA90D099366690FBF50675B59B4C40FA_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock_EA90D099366690FBF50675B59B4C40FA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Future Minimum Rental Payments for Operating Leases </link:label>

<link:label id="lab_us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock_EA90D099366690FBF50675B59B4C40FA_label_en-US" xlink:label="lab_us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock_EA90D099366690FBF50675B59B4C40FA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock_EA90D099366690FBF50675B59B4C40FA" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock_EA90D099366690FBF50675B59B4C40FA" xlink:to="lab_us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock_EA90D099366690FBF50675B59B4C40FA" xlink:type="arc"/>

<link:label id="lab_us-gaap_ScheduleOfFutureMinimumLeasePaymentsForCapitalLeasesTableTextBlock_4A04E19DB301D062066775B59B4C77C9_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfFutureMinimumLeasePaymentsForCapitalLeasesTableTextBlock_4A04E19DB301D062066775B59B4C77C9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Future Minimum Lease Payments for Capital Leases </link:label>

<link:label id="lab_us-gaap_ScheduleOfFutureMinimumLeasePaymentsForCapitalLeasesTableTextBlock_4A04E19DB301D062066775B59B4C77C9_label_en-US" xlink:label="lab_us-gaap_ScheduleOfFutureMinimumLeasePaymentsForCapitalLeasesTableTextBlock_4A04E19DB301D062066775B59B4C77C9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfFutureMinimumLeasePaymentsForCapitalLeasesTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfFutureMinimumLeasePaymentsForCapitalLeasesTableTextBlock_4A04E19DB301D062066775B59B4C77C9" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfFutureMinimumLeasePaymentsForCapitalLeasesTableTextBlock_4A04E19DB301D062066775B59B4C77C9" xlink:to="lab_us-gaap_ScheduleOfFutureMinimumLeasePaymentsForCapitalLeasesTableTextBlock_4A04E19DB301D062066775B59B4C77C9" xlink:type="arc"/>

<link:label id="lab_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_C4C84AB85B71A40BF62875B59AAF6E51_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_C4C84AB85B71A40BF62875B59AAF6E51" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Earnings Per Share, Basic and Diluted </link:label>

<link:label id="lab_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_C4C84AB85B71A40BF62875B59AAF6E51_label_en-US" xlink:label="lab_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_C4C84AB85B71A40BF62875B59AAF6E51" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_C4C84AB85B71A40BF62875B59AAF6E51" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_C4C84AB85B71A40BF62875B59AAF6E51" xlink:to="lab_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_C4C84AB85B71A40BF62875B59AAF6E51" xlink:type="arc"/>

<link:label id="lab_core_A2007LtipMember_85230AD6B3985714271099C2E766CB2A_terseLabel_en-US" xlink:label="lab_core_A2007LtipMember_85230AD6B3985714271099C2E766CB2A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2007 LTIP </link:label>

<link:label id="lab_core_A2007LtipMember_85230AD6B3985714271099C2E766CB2A_label_en-US" xlink:label="lab_core_A2007LtipMember_85230AD6B3985714271099C2E766CB2A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> 2007 LTIP [Member] </link:label>

<link:label id="lab_core_A2007LtipMember_85230AD6B3985714271099C2E766CB2A_documentation_en-US" xlink:label="lab_core_A2007LtipMember_85230AD6B3985714271099C2E766CB2A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> 2007 LTIP [Member] </link:label>

<link:loc xlink:href="core-20191231.xsd#core_A2007LtipMember" xlink:label="loc_core_A2007LtipMember_85230AD6B3985714271099C2E766CB2A" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_A2007LtipMember_85230AD6B3985714271099C2E766CB2A" xlink:to="lab_core_A2007LtipMember_85230AD6B3985714271099C2E766CB2A" xlink:type="arc"/>

<link:label id="lab_core_A2019LTIPMember_24BB515710788B9BC29999C2E766A62B_terseLabel_en-US" xlink:label="lab_core_A2019LTIPMember_24BB515710788B9BC29999C2E766A62B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2019 LTIP </link:label>

<link:label id="lab_core_A2019LTIPMember_24BB515710788B9BC29999C2E766A62B_label_en-US" xlink:label="lab_core_A2019LTIPMember_24BB515710788B9BC29999C2E766A62B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> 2019 LTIP [Member] </link:label>

<link:label id="lab_core_A2019LTIPMember_24BB515710788B9BC29999C2E766A62B_documentation_en-US" xlink:label="lab_core_A2019LTIPMember_24BB515710788B9BC29999C2E766A62B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> 2019 LTIP </link:label>

<link:loc xlink:href="core-20191231.xsd#core_A2019LTIPMember" xlink:label="loc_core_A2019LTIPMember_24BB515710788B9BC29999C2E766A62B" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_A2019LTIPMember_24BB515710788B9BC29999C2E766A62B" xlink:to="lab_core_A2019LTIPMember_24BB515710788B9BC29999C2E766A62B" xlink:type="arc"/>

<link:label id="lab_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSecuritiesToBeIssuedUponExerciseOfOutstandingOptionsWarrantsAndRights_414872DEAC897C6C22F499C2E76631A6_terseLabel_en-US" xlink:label="lab_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSecuritiesToBeIssuedUponExerciseOfOutstandingOptionsWarrantsAndRights_414872DEAC897C6C22F499C2E76631A6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Number of securities to be issued upon vesting of RSUs and performance share awards (in shares) </link:label>

<link:label id="lab_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSecuritiesToBeIssuedUponExerciseOfOutstandingOptionsWarrantsAndRights_414872DEAC897C6C22F499C2E76631A6_label_en-US" xlink:label="lab_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSecuritiesToBeIssuedUponExerciseOfOutstandingOptionsWarrantsAndRights_414872DEAC897C6C22F499C2E76631A6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Number of Securities To Be Issued Upon Exercise of Outstanding Options, Warrants and Rights </link:label>

<link:label id="lab_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSecuritiesToBeIssuedUponExerciseOfOutstandingOptionsWarrantsAndRights_414872DEAC897C6C22F499C2E76631A6_documentation_en-US" xlink:label="lab_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSecuritiesToBeIssuedUponExerciseOfOutstandingOptionsWarrantsAndRights_414872DEAC897C6C22F499C2E76631A6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Number of Securities To Be Issued Upon Exercise of Outstanding Options, Warrants and Rights </link:label>

<link:loc xlink:href="core-20191231.xsd#core_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSecuritiesToBeIssuedUponExerciseOfOutstandingOptionsWarrantsAndRights" xlink:label="loc_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSecuritiesToBeIssuedUponExerciseOfOutstandingOptionsWarrantsAndRights_414872DEAC897C6C22F499C2E76631A6" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSecuritiesToBeIssuedUponExerciseOfOutstandingOptionsWarrantsAndRights_414872DEAC897C6C22F499C2E76631A6" xlink:to="lab_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSecuritiesToBeIssuedUponExerciseOfOutstandingOptionsWarrantsAndRights_414872DEAC897C6C22F499C2E76631A6" xlink:type="arc"/>

<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_3B2F61466C68C066D61499C2E76788DE_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_3B2F61466C68C066D61499C2E76788DE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Weighted-average exercise price of vesting of RSUs and performance share awards (in dollars per share) </link:label>

<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_3B2F61466C68C066D61499C2E76788DE_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_3B2F61466C68C066D61499C2E76788DE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_3B2F61466C68C066D61499C2E76788DE" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_3B2F61466C68C066D61499C2E76788DE" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_3B2F61466C68C066D61499C2E76788DE" xlink:type="arc"/>

<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_646177717A749D72CEC899C2E7671AE7_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_646177717A749D72CEC899C2E7671AE7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Number of securities remaining available for future issuance under equity compensation plans (excluding securities reflected in column 1) (in shares) </link:label>

<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_646177717A749D72CEC899C2E7671AE7_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_646177717A749D72CEC899C2E7671AE7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_646177717A749D72CEC899C2E7671AE7" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_646177717A749D72CEC899C2E7671AE7" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_646177717A749D72CEC899C2E7671AE7" xlink:type="arc"/>

<link:label id="lab_us-gaap_OperatingLeaseCost_779EA650567FFF9A250575B59B38750B_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseCost_779EA650567FFF9A250575B59B38750B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Operating lease cost </link:label>

<link:label id="lab_us-gaap_OperatingLeaseCost_779EA650567FFF9A250575B59B38750B_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseCost_779EA650567FFF9A250575B59B38750B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Lease, Cost </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseCost" xlink:label="loc_us-gaap_OperatingLeaseCost_779EA650567FFF9A250575B59B38750B" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseCost_779EA650567FFF9A250575B59B38750B" xlink:to="lab_us-gaap_OperatingLeaseCost_779EA650567FFF9A250575B59B38750B" xlink:type="arc"/>

<link:label id="lab_core_FinanceLeaseCostsAbstract_317F1ACE97C2AF03799E75B59B394E04_terseLabel_en-US" xlink:label="lab_core_FinanceLeaseCostsAbstract_317F1ACE97C2AF03799E75B59B394E04" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Finance lease cost: </link:label>

<link:label id="lab_core_FinanceLeaseCostsAbstract_317F1ACE97C2AF03799E75B59B394E04_label_en-US" xlink:label="lab_core_FinanceLeaseCostsAbstract_317F1ACE97C2AF03799E75B59B394E04" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finance Lease Costs [Abstract] </link:label>

<link:label id="lab_core_FinanceLeaseCostsAbstract_317F1ACE97C2AF03799E75B59B394E04_documentation_en-US" xlink:label="lab_core_FinanceLeaseCostsAbstract_317F1ACE97C2AF03799E75B59B394E04" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Finance Lease Costs [Abstract] </link:label>

<link:loc xlink:href="core-20191231.xsd#core_FinanceLeaseCostsAbstract" xlink:label="loc_core_FinanceLeaseCostsAbstract_317F1ACE97C2AF03799E75B59B394E04" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_FinanceLeaseCostsAbstract_317F1ACE97C2AF03799E75B59B394E04" xlink:to="lab_core_FinanceLeaseCostsAbstract_317F1ACE97C2AF03799E75B59B394E04" xlink:type="arc"/>

<link:label id="lab_us-gaap_FinanceLeaseRightOfUseAssetAmortization_EC760AB89DB470599D6775B59B391B12_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseRightOfUseAssetAmortization_EC760AB89DB470599D6775B59B391B12" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Amortization of leased assets </link:label>

<link:label id="lab_us-gaap_FinanceLeaseRightOfUseAssetAmortization_EC760AB89DB470599D6775B59B391B12_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseRightOfUseAssetAmortization_EC760AB89DB470599D6775B59B391B12" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finance Lease, Right-of-Use Asset, Amortization </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseRightOfUseAssetAmortization" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAssetAmortization_EC760AB89DB470599D6775B59B391B12" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseRightOfUseAssetAmortization_EC760AB89DB470599D6775B59B391B12" xlink:to="lab_us-gaap_FinanceLeaseRightOfUseAssetAmortization_EC760AB89DB470599D6775B59B391B12" xlink:type="arc"/>

<link:label id="lab_us-gaap_FinanceLeaseInterestExpense_F3A2CDBA7691A6A9694F75B59B395EB4_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseInterestExpense_F3A2CDBA7691A6A9694F75B59B395EB4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Interest on lease liabilities </link:label>

<link:label id="lab_us-gaap_FinanceLeaseInterestExpense_F3A2CDBA7691A6A9694F75B59B395EB4_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseInterestExpense_F3A2CDBA7691A6A9694F75B59B395EB4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finance Lease, Interest Expense </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseInterestExpense" xlink:label="loc_us-gaap_FinanceLeaseInterestExpense_F3A2CDBA7691A6A9694F75B59B395EB4" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseInterestExpense_F3A2CDBA7691A6A9694F75B59B395EB4" xlink:to="lab_us-gaap_FinanceLeaseInterestExpense_F3A2CDBA7691A6A9694F75B59B395EB4" xlink:type="arc"/>

<link:label id="lab_us-gaap_ShortTermLeaseCost_341237A6B15F11CDED8875B59B39D9D6_terseLabel_en-US" xlink:label="lab_us-gaap_ShortTermLeaseCost_341237A6B15F11CDED8875B59B39D9D6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Short-term lease cost </link:label>

<link:label id="lab_us-gaap_ShortTermLeaseCost_341237A6B15F11CDED8875B59B39D9D6_label_en-US" xlink:label="lab_us-gaap_ShortTermLeaseCost_341237A6B15F11CDED8875B59B39D9D6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Short-term Lease, Cost </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShortTermLeaseCost" xlink:label="loc_us-gaap_ShortTermLeaseCost_341237A6B15F11CDED8875B59B39D9D6" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShortTermLeaseCost_341237A6B15F11CDED8875B59B39D9D6" xlink:to="lab_us-gaap_ShortTermLeaseCost_341237A6B15F11CDED8875B59B39D9D6" xlink:type="arc"/>

<link:label id="lab_us-gaap_VariableLeaseCost_B1C77C27B2FE3958725475B59B39B506_terseLabel_en-US" xlink:label="lab_us-gaap_VariableLeaseCost_B1C77C27B2FE3958725475B59B39B506" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Variable lease cost </link:label>

<link:label id="lab_us-gaap_VariableLeaseCost_B1C77C27B2FE3958725475B59B39B506_label_en-US" xlink:label="lab_us-gaap_VariableLeaseCost_B1C77C27B2FE3958725475B59B39B506" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Variable Lease, Cost </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_VariableLeaseCost" xlink:label="loc_us-gaap_VariableLeaseCost_B1C77C27B2FE3958725475B59B39B506" xlink:type="locator"/>

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<link:label id="lab_us-gaap_LeaseCost_C906F82E8793FBD29B2975B59B3908D7_totalLabel_en-US" xlink:label="lab_us-gaap_LeaseCost_C906F82E8793FBD29B2975B59B3908D7" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Net lease cost </link:label>

<link:label id="lab_us-gaap_LeaseCost_C906F82E8793FBD29B2975B59B3908D7_label_en-US" xlink:label="lab_us-gaap_LeaseCost_C906F82E8793FBD29B2975B59B3908D7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lease, Cost </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LeaseCost" xlink:label="loc_us-gaap_LeaseCost_C906F82E8793FBD29B2975B59B3908D7" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LeaseCost_C906F82E8793FBD29B2975B59B3908D7" xlink:to="lab_us-gaap_LeaseCost_C906F82E8793FBD29B2975B59B3908D7" xlink:type="arc"/>

<link:label id="lab_core_LeaseTermAbstract_D15ABFA5C35BFB5EDAC075B59B3AABD4_terseLabel_en-US" xlink:label="lab_core_LeaseTermAbstract_D15ABFA5C35BFB5EDAC075B59B3AABD4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Lease Term [Abstract] </link:label>

<link:label id="lab_core_LeaseTermAbstract_D15ABFA5C35BFB5EDAC075B59B3AABD4_label_en-US" xlink:label="lab_core_LeaseTermAbstract_D15ABFA5C35BFB5EDAC075B59B3AABD4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lease Term [Abstract] </link:label>

<link:label id="lab_core_LeaseTermAbstract_D15ABFA5C35BFB5EDAC075B59B3AABD4_documentation_en-US" xlink:label="lab_core_LeaseTermAbstract_D15ABFA5C35BFB5EDAC075B59B3AABD4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Lease Term [Abstract] </link:label>

<link:loc xlink:href="core-20191231.xsd#core_LeaseTermAbstract" xlink:label="loc_core_LeaseTermAbstract_D15ABFA5C35BFB5EDAC075B59B3AABD4" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_LeaseTermAbstract_D15ABFA5C35BFB5EDAC075B59B3AABD4" xlink:to="lab_core_LeaseTermAbstract_D15ABFA5C35BFB5EDAC075B59B3AABD4" xlink:type="arc"/>

<link:label id="lab_core_WeightedaverageRemainingLeaseTermAbstract_6372931258B9993321B775B59B3AABE0_terseLabel_en-US" xlink:label="lab_core_WeightedaverageRemainingLeaseTermAbstract_6372931258B9993321B775B59B3AABE0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Weighted-average Remaining Lease Term [Abstract] </link:label>

<link:label id="lab_core_WeightedaverageRemainingLeaseTermAbstract_6372931258B9993321B775B59B3AABE0_label_en-US" xlink:label="lab_core_WeightedaverageRemainingLeaseTermAbstract_6372931258B9993321B775B59B3AABE0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Weighted-average Remaining Lease Term [Abstract] </link:label>

<link:label id="lab_core_WeightedaverageRemainingLeaseTermAbstract_6372931258B9993321B775B59B3AABE0_documentation_en-US" xlink:label="lab_core_WeightedaverageRemainingLeaseTermAbstract_6372931258B9993321B775B59B3AABE0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Weighted-average Remaining Lease Term [Abstract] </link:label>

<link:loc xlink:href="core-20191231.xsd#core_WeightedaverageRemainingLeaseTermAbstract" xlink:label="loc_core_WeightedaverageRemainingLeaseTermAbstract_6372931258B9993321B775B59B3AABE0" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_WeightedaverageRemainingLeaseTermAbstract_6372931258B9993321B775B59B3AABE0" xlink:to="lab_core_WeightedaverageRemainingLeaseTermAbstract_6372931258B9993321B775B59B3AABE0" xlink:type="arc"/>

<link:label id="lab_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_47C3AD783A3312FB6F9075B59B3AB490_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_47C3AD783A3312FB6F9075B59B3AB490" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Weighted-average remaining lease term (years), operating </link:label>

<link:label id="lab_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_47C3AD783A3312FB6F9075B59B3AB490_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_47C3AD783A3312FB6F9075B59B3AB490" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Lease, Weighted Average Remaining Lease Term </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_47C3AD783A3312FB6F9075B59B3AB490" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_47C3AD783A3312FB6F9075B59B3AB490" xlink:to="lab_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_47C3AD783A3312FB6F9075B59B3AB490" xlink:type="arc"/>

<link:label id="lab_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_30412D6E3449DC38644A75B59B3AA592_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_30412D6E3449DC38644A75B59B3AA592" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Weighted-average remaining lease term (years), finance </link:label>

<link:label id="lab_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_30412D6E3449DC38644A75B59B3AA592_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_30412D6E3449DC38644A75B59B3AA592" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finance Lease, Weighted Average Remaining Lease Term </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1" xlink:label="loc_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_30412D6E3449DC38644A75B59B3AA592" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_30412D6E3449DC38644A75B59B3AA592" xlink:to="lab_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_30412D6E3449DC38644A75B59B3AA592" xlink:type="arc"/>

<link:label id="lab_core_DiscountRateAbstract_30C88EEB185B53AA487B75B59B3BA525_terseLabel_en-US" xlink:label="lab_core_DiscountRateAbstract_30C88EEB185B53AA487B75B59B3BA525" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Discount Rate [Abstract] </link:label>

<link:label id="lab_core_DiscountRateAbstract_30C88EEB185B53AA487B75B59B3BA525_label_en-US" xlink:label="lab_core_DiscountRateAbstract_30C88EEB185B53AA487B75B59B3BA525" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Discount Rate [Abstract] </link:label>

<link:label id="lab_core_DiscountRateAbstract_30C88EEB185B53AA487B75B59B3BA525_documentation_en-US" xlink:label="lab_core_DiscountRateAbstract_30C88EEB185B53AA487B75B59B3BA525" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Discount Rate [Abstract] </link:label>

<link:loc xlink:href="core-20191231.xsd#core_DiscountRateAbstract" xlink:label="loc_core_DiscountRateAbstract_30C88EEB185B53AA487B75B59B3BA525" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_DiscountRateAbstract_30C88EEB185B53AA487B75B59B3BA525" xlink:to="lab_core_DiscountRateAbstract_30C88EEB185B53AA487B75B59B3BA525" xlink:type="arc"/>

<link:label id="lab_core_WeightedaverageDiscountRateAbstract_59665E7445AB3F47C46775B59B3B5DC8_terseLabel_en-US" xlink:label="lab_core_WeightedaverageDiscountRateAbstract_59665E7445AB3F47C46775B59B3B5DC8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Weighted-average Discount Rate [Abstract] </link:label>

<link:label id="lab_core_WeightedaverageDiscountRateAbstract_59665E7445AB3F47C46775B59B3B5DC8_label_en-US" xlink:label="lab_core_WeightedaverageDiscountRateAbstract_59665E7445AB3F47C46775B59B3B5DC8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Weighted-average Discount Rate [Abstract] </link:label>

<link:label id="lab_core_WeightedaverageDiscountRateAbstract_59665E7445AB3F47C46775B59B3B5DC8_documentation_en-US" xlink:label="lab_core_WeightedaverageDiscountRateAbstract_59665E7445AB3F47C46775B59B3B5DC8" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Weighted-average Discount Rate [Abstract] </link:label>

<link:loc xlink:href="core-20191231.xsd#core_WeightedaverageDiscountRateAbstract" xlink:label="loc_core_WeightedaverageDiscountRateAbstract_59665E7445AB3F47C46775B59B3B5DC8" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_WeightedaverageDiscountRateAbstract_59665E7445AB3F47C46775B59B3B5DC8" xlink:to="lab_core_WeightedaverageDiscountRateAbstract_59665E7445AB3F47C46775B59B3B5DC8" xlink:type="arc"/>

<link:label id="lab_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_5E1A10D3853AF398C89E75B59B3B684C_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_5E1A10D3853AF398C89E75B59B3B684C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Weighted-average discount rate, opeating </link:label>

<link:label id="lab_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_5E1A10D3853AF398C89E75B59B3B684C_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_5E1A10D3853AF398C89E75B59B3B684C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Lease, Weighted Average Discount Rate, Percent </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_5E1A10D3853AF398C89E75B59B3B684C" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_5E1A10D3853AF398C89E75B59B3B684C" xlink:to="lab_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_5E1A10D3853AF398C89E75B59B3B684C" xlink:type="arc"/>

<link:label id="lab_us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent_4EBEE14B07C7BBD87F9C75B59B3BB108_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent_4EBEE14B07C7BBD87F9C75B59B3BB108" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Weighted-average discount rate, finance </link:label>

<link:label id="lab_us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent_4EBEE14B07C7BBD87F9C75B59B3BB108_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent_4EBEE14B07C7BBD87F9C75B59B3BB108" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finance Lease, Weighted Average Discount Rate, Percent </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent" xlink:label="loc_us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent_4EBEE14B07C7BBD87F9C75B59B3BB108" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent_4EBEE14B07C7BBD87F9C75B59B3BB108" xlink:to="lab_us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent_4EBEE14B07C7BBD87F9C75B59B3BB108" xlink:type="arc"/>

<link:label id="lab_core_CashAmountsPaidintheMeasurementofLeaseLiabilitiesAbstract_FB459D8CD4BC4DDE4A6B75B59B3B2C81_terseLabel_en-US" xlink:label="lab_core_CashAmountsPaidintheMeasurementofLeaseLiabilitiesAbstract_FB459D8CD4BC4DDE4A6B75B59B3B2C81" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cash paid for amounts included in the measurement of lease liabilities: </link:label>

<link:label id="lab_core_CashAmountsPaidintheMeasurementofLeaseLiabilitiesAbstract_FB459D8CD4BC4DDE4A6B75B59B3B2C81_label_en-US" xlink:label="lab_core_CashAmountsPaidintheMeasurementofLeaseLiabilitiesAbstract_FB459D8CD4BC4DDE4A6B75B59B3B2C81" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cash Amounts Paid in the Measurement of Lease Liabilities [Abstract] </link:label>

<link:label id="lab_core_CashAmountsPaidintheMeasurementofLeaseLiabilitiesAbstract_FB459D8CD4BC4DDE4A6B75B59B3B2C81_documentation_en-US" xlink:label="lab_core_CashAmountsPaidintheMeasurementofLeaseLiabilitiesAbstract_FB459D8CD4BC4DDE4A6B75B59B3B2C81" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Cash Amounts Paid in the Measurement of Lease Liabilities [Abstract] </link:label>

<link:loc xlink:href="core-20191231.xsd#core_CashAmountsPaidintheMeasurementofLeaseLiabilitiesAbstract" xlink:label="loc_core_CashAmountsPaidintheMeasurementofLeaseLiabilitiesAbstract_FB459D8CD4BC4DDE4A6B75B59B3B2C81" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_CashAmountsPaidintheMeasurementofLeaseLiabilitiesAbstract_FB459D8CD4BC4DDE4A6B75B59B3B2C81" xlink:to="lab_core_CashAmountsPaidintheMeasurementofLeaseLiabilitiesAbstract_FB459D8CD4BC4DDE4A6B75B59B3B2C81" xlink:type="arc"/>

<link:label id="lab_us-gaap_OperatingLeasePayments_3ECD02A1C40736A2FD2E75B59B3C1E93_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasePayments_3ECD02A1C40736A2FD2E75B59B3C1E93" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Operating cash flows used by operating leases </link:label>

<link:label id="lab_us-gaap_OperatingLeasePayments_3ECD02A1C40736A2FD2E75B59B3C1E93_label_en-US" xlink:label="lab_us-gaap_OperatingLeasePayments_3ECD02A1C40736A2FD2E75B59B3C1E93" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Lease, Payments </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasePayments" xlink:label="loc_us-gaap_OperatingLeasePayments_3ECD02A1C40736A2FD2E75B59B3C1E93" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasePayments_3ECD02A1C40736A2FD2E75B59B3C1E93" xlink:to="lab_us-gaap_OperatingLeasePayments_3ECD02A1C40736A2FD2E75B59B3C1E93" xlink:type="arc"/>

<link:label id="lab_us-gaap_FinanceLeaseInterestPaymentOnLiability_450380F14A5576482BBD75B59B3C852D_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseInterestPaymentOnLiability_450380F14A5576482BBD75B59B3C852D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Operating cash flows used by finance leases </link:label>

<link:label id="lab_us-gaap_FinanceLeaseInterestPaymentOnLiability_450380F14A5576482BBD75B59B3C852D_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseInterestPaymentOnLiability_450380F14A5576482BBD75B59B3C852D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finance Lease, Interest Payment on Liability </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseInterestPaymentOnLiability" xlink:label="loc_us-gaap_FinanceLeaseInterestPaymentOnLiability_450380F14A5576482BBD75B59B3C852D" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseInterestPaymentOnLiability_450380F14A5576482BBD75B59B3C852D" xlink:to="lab_us-gaap_FinanceLeaseInterestPaymentOnLiability_450380F14A5576482BBD75B59B3C852D" xlink:type="arc"/>

<link:label id="lab_us-gaap_FinanceLeasePrincipalPayments_AFEDF536A9CFDE83CE3575B59B3C0122_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeasePrincipalPayments_AFEDF536A9CFDE83CE3575B59B3C0122" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Financing cash flows used by finance leases </link:label>

<link:label id="lab_us-gaap_FinanceLeasePrincipalPayments_AFEDF536A9CFDE83CE3575B59B3C0122_label_en-US" xlink:label="lab_us-gaap_FinanceLeasePrincipalPayments_AFEDF536A9CFDE83CE3575B59B3C0122" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finance Lease, Principal Payments </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeasePrincipalPayments" xlink:label="loc_us-gaap_FinanceLeasePrincipalPayments_AFEDF536A9CFDE83CE3575B59B3C0122" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeasePrincipalPayments_AFEDF536A9CFDE83CE3575B59B3C0122" xlink:to="lab_us-gaap_FinanceLeasePrincipalPayments_AFEDF536A9CFDE83CE3575B59B3C0122" xlink:type="arc"/>

<link:label id="lab_core_LeaseLiabilitiesArisingfromObtainingNewROUAssetAbstract_B7398417776C6A3218EA75B59B3CDE16_terseLabel_en-US" xlink:label="lab_core_LeaseLiabilitiesArisingfromObtainingNewROUAssetAbstract_B7398417776C6A3218EA75B59B3CDE16" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Lease liabilities arising from obtaining new ROU assets: </link:label>

<link:label id="lab_core_LeaseLiabilitiesArisingfromObtainingNewROUAssetAbstract_B7398417776C6A3218EA75B59B3CDE16_label_en-US" xlink:label="lab_core_LeaseLiabilitiesArisingfromObtainingNewROUAssetAbstract_B7398417776C6A3218EA75B59B3CDE16" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lease Liabilities Arising from Obtaining New ROU Asset [Abstract] </link:label>

<link:label id="lab_core_LeaseLiabilitiesArisingfromObtainingNewROUAssetAbstract_B7398417776C6A3218EA75B59B3CDE16_documentation_en-US" xlink:label="lab_core_LeaseLiabilitiesArisingfromObtainingNewROUAssetAbstract_B7398417776C6A3218EA75B59B3CDE16" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Lease Liabilities Arising from Obtaining New ROU Asset [Abstract] </link:label>

<link:loc xlink:href="core-20191231.xsd#core_LeaseLiabilitiesArisingfromObtainingNewROUAssetAbstract" xlink:label="loc_core_LeaseLiabilitiesArisingfromObtainingNewROUAssetAbstract_B7398417776C6A3218EA75B59B3CDE16" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_LeaseLiabilitiesArisingfromObtainingNewROUAssetAbstract_B7398417776C6A3218EA75B59B3CDE16" xlink:to="lab_core_LeaseLiabilitiesArisingfromObtainingNewROUAssetAbstract_B7398417776C6A3218EA75B59B3CDE16" xlink:type="arc"/>

<link:label id="lab_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_14B6CA68F37F60C1066075B59B3C4611_terseLabel_en-US" xlink:label="lab_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_14B6CA68F37F60C1066075B59B3C4611" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Lease liabilities arising from obtaining new ROU assets, operating leases </link:label>

<link:label id="lab_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_14B6CA68F37F60C1066075B59B3C4611_label_en-US" xlink:label="lab_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_14B6CA68F37F60C1066075B59B3C4611" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Right-of-Use Asset Obtained in Exchange for Operating Lease Liability </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability" xlink:label="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_14B6CA68F37F60C1066075B59B3C4611" xlink:type="locator"/>

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<link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_CB5E1B380630E87B3B7675B59B14F698_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_CB5E1B380630E87B3B7675B59B14F698" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finite-Lived Intangible Assets, Accumulated Amortization </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_CB5E1B380630E87B3B7675B59B14F698" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_CB5E1B380630E87B3B7675B59B14F698" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_CB5E1B380630E87B3B7675B59B14F698" xlink:type="arc"/>

<link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsNet_CCA9091F8860EB03740175B59B14DA04_totalLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsNet_CCA9091F8860EB03740175B59B14DA04" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Net Carrying Amount </link:label>

<link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsNet_CCA9091F8860EB03740175B59B14DA04_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsNet_CCA9091F8860EB03740175B59B14DA04" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finite-Lived Intangible Assets, Net </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_CCA9091F8860EB03740175B59B14DA04" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_CCA9091F8860EB03740175B59B14DA04" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsNet_CCA9091F8860EB03740175B59B14DA04" xlink:type="arc"/>

<link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_3D704A2BC689C580910475B59B144105_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_3D704A2BC689C580910475B59B144105" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] </link:label>

<link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_3D704A2BC689C580910475B59B144105_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_3D704A2BC689C580910475B59B144105" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_3D704A2BC689C580910475B59B144105" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_3D704A2BC689C580910475B59B144105" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_3D704A2BC689C580910475B59B144105" xlink:type="arc"/>

<link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_C63F7C90C7C4454F4CC875B59B140F38_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_C63F7C90C7C4454F4CC875B59B140F38" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2020 </link:label>

<link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_C63F7C90C7C4454F4CC875B59B140F38_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_C63F7C90C7C4454F4CC875B59B140F38" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_C63F7C90C7C4454F4CC875B59B140F38" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_C63F7C90C7C4454F4CC875B59B140F38" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_C63F7C90C7C4454F4CC875B59B140F38" xlink:type="arc"/>

<link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_83155BD2F1B1E52D259F75B59B153E56_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_83155BD2F1B1E52D259F75B59B153E56" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2021 </link:label>

<link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_83155BD2F1B1E52D259F75B59B153E56_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_83155BD2F1B1E52D259F75B59B153E56" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finite-Lived Intangible Assets, Amortization Expense, Year Two </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_83155BD2F1B1E52D259F75B59B153E56" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_83155BD2F1B1E52D259F75B59B153E56" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_83155BD2F1B1E52D259F75B59B153E56" xlink:type="arc"/>

<link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_51D55F92837118EA655B75B59B151923_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_51D55F92837118EA655B75B59B151923" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2022 </link:label>

<link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_51D55F92837118EA655B75B59B151923_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_51D55F92837118EA655B75B59B151923" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finite-Lived Intangible Assets, Amortization Expense, Year Three </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_51D55F92837118EA655B75B59B151923" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_51D55F92837118EA655B75B59B151923" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_51D55F92837118EA655B75B59B151923" xlink:type="arc"/>

<link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_EBB419524FB89A35238475B59B154401_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_EBB419524FB89A35238475B59B154401" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2023 </link:label>

<link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_EBB419524FB89A35238475B59B154401_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_EBB419524FB89A35238475B59B154401" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finite-Lived Intangible Assets, Amortization Expense, Year Four </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_EBB419524FB89A35238475B59B154401" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_EBB419524FB89A35238475B59B154401" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_EBB419524FB89A35238475B59B154401" xlink:type="arc"/>

<link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_A5E7BCAC0696E5FE6A2D75B59B158E53_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_A5E7BCAC0696E5FE6A2D75B59B158E53" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2024 </link:label>

<link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_A5E7BCAC0696E5FE6A2D75B59B158E53_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_A5E7BCAC0696E5FE6A2D75B59B158E53" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finite-Lived Intangible Assets, Amortization Expense, Year Five </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_A5E7BCAC0696E5FE6A2D75B59B158E53" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_A5E7BCAC0696E5FE6A2D75B59B158E53" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_A5E7BCAC0696E5FE6A2D75B59B158E53" xlink:type="arc"/>

<link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_2F2685F05D9EF225B71875B59B15DC0B_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_2F2685F05D9EF225B71875B59B15DC0B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2025 and thereafter </link:label>

<link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_2F2685F05D9EF225B71875B59B15DC0B_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_2F2685F05D9EF225B71875B59B15DC0B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finite-Lived Intangible Assets, Amortization Expense, after Year Five </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_2F2685F05D9EF225B71875B59B15DC0B" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_2F2685F05D9EF225B71875B59B15DC0B" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_2F2685F05D9EF225B71875B59B15DC0B" xlink:type="arc"/>

<link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_DC71715EFD927BA7C49275B59C2E3BDF_terseLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_DC71715EFD927BA7C49275B59C2E3BDF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cash and cash equivalents </link:label>

<link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_DC71715EFD927BA7C49275B59C2E3BDF_label_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_DC71715EFD927BA7C49275B59C2E3BDF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cash and Cash Equivalents, at Carrying Value </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_DC71715EFD927BA7C49275B59C2E3BDF" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_DC71715EFD927BA7C49275B59C2E3BDF" xlink:to="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_DC71715EFD927BA7C49275B59C2E3BDF" xlink:type="arc"/>

<link:label id="lab_us-gaap_AccountsReceivableNetCurrent_6801CC3B095942BDEE5A75B59C2EDCFF_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsReceivableNetCurrent_6801CC3B095942BDEE5A75B59C2EDCFF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accounts receivable, net of allowance for doubtful accounts of $14.5 and $8.3 at December 31, 2019 and 2018, respectively (Note 4) </link:label>

<link:label id="lab_us-gaap_AccountsReceivableNetCurrent_6801CC3B095942BDEE5A75B59C2EDCFF_label_en-US" xlink:label="lab_us-gaap_AccountsReceivableNetCurrent_6801CC3B095942BDEE5A75B59C2EDCFF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accounts Receivable, after Allowance for Credit Loss, Current </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_6801CC3B095942BDEE5A75B59C2EDCFF" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccountsReceivableNetCurrent_6801CC3B095942BDEE5A75B59C2EDCFF" xlink:to="lab_us-gaap_AccountsReceivableNetCurrent_6801CC3B095942BDEE5A75B59C2EDCFF" xlink:type="arc"/>

<link:label id="lab_us-gaap_OtherReceivablesNetCurrent_C2809FCA1CB2589D207775B59C2EA601_terseLabel_en-US" xlink:label="lab_us-gaap_OtherReceivablesNetCurrent_C2809FCA1CB2589D207775B59C2EA601" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other receivables, net (Note 4) </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherReceivablesNetCurrent" xlink:label="loc_us-gaap_OtherReceivablesNetCurrent_C2809FCA1CB2589D207775B59C2EA601" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherReceivablesNetCurrent_C2809FCA1CB2589D207775B59C2EA601" xlink:to="lab_us-gaap_OtherReceivablesNetCurrent_C2809FCA1CB2589D207775B59C2EA601" xlink:type="arc"/>

<link:label id="lab_us-gaap_InventoryNet_B9F3D45408254F1B0FAD75B59C2E68BC_terseLabel_en-US" xlink:label="lab_us-gaap_InventoryNet_B9F3D45408254F1B0FAD75B59C2E68BC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Inventories, net (Note 5) </link:label>

<link:label id="lab_us-gaap_InventoryNet_B9F3D45408254F1B0FAD75B59C2E68BC_label_en-US" xlink:label="lab_us-gaap_InventoryNet_B9F3D45408254F1B0FAD75B59C2E68BC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Inventory, Net </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InventoryNet" xlink:label="loc_us-gaap_InventoryNet_B9F3D45408254F1B0FAD75B59C2E68BC" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InventoryNet_B9F3D45408254F1B0FAD75B59C2E68BC" xlink:to="lab_us-gaap_InventoryNet_B9F3D45408254F1B0FAD75B59C2E68BC" xlink:type="arc"/>

<link:label id="lab_core_DepositsAndPrepaymentsCurrent_30990C8ECADB7CCEFCD775B59C2E084D_terseLabel_en-US" xlink:label="lab_core_DepositsAndPrepaymentsCurrent_30990C8ECADB7CCEFCD775B59C2E084D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Deposits and prepayments (Note 4) </link:label>

<link:loc xlink:href="core-20191231.xsd#core_DepositsAndPrepaymentsCurrent" xlink:label="loc_core_DepositsAndPrepaymentsCurrent_30990C8ECADB7CCEFCD775B59C2E084D" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_DepositsAndPrepaymentsCurrent_30990C8ECADB7CCEFCD775B59C2E084D" xlink:to="lab_core_DepositsAndPrepaymentsCurrent_30990C8ECADB7CCEFCD775B59C2E084D" xlink:type="arc"/>

<link:label id="lab_us-gaap_AssetsCurrent_295E9F5F0AA0B6151EAB75B59C2FE1E8_totalLabel_en-US" xlink:label="lab_us-gaap_AssetsCurrent_295E9F5F0AA0B6151EAB75B59C2FE1E8" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total current assets </link:label>

<link:label id="lab_us-gaap_AssetsCurrent_295E9F5F0AA0B6151EAB75B59C2FE1E8_label_en-US" xlink:label="lab_us-gaap_AssetsCurrent_295E9F5F0AA0B6151EAB75B59C2FE1E8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Assets, Current </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaap_AssetsCurrent_295E9F5F0AA0B6151EAB75B59C2FE1E8" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetsCurrent_295E9F5F0AA0B6151EAB75B59C2FE1E8" xlink:to="lab_us-gaap_AssetsCurrent_295E9F5F0AA0B6151EAB75B59C2FE1E8" xlink:type="arc"/>

<link:label id="lab_us-gaap_PropertyPlantAndEquipmentNet_937F7E984D6DF719719D75B59C2FBCB3_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_937F7E984D6DF719719D75B59C2FBCB3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Property and equipment, net (Note 6) </link:label>

<link:label id="lab_us-gaap_PropertyPlantAndEquipmentNet_937F7E984D6DF719719D75B59C2FBCB3_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_937F7E984D6DF719719D75B59C2FBCB3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment, Net </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_937F7E984D6DF719719D75B59C2FBCB3" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_937F7E984D6DF719719D75B59C2FBCB3" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentNet_937F7E984D6DF719719D75B59C2FBCB3" xlink:type="arc"/>

<link:label id="lab_us-gaap_Goodwill_C088CB28B7A4DF9B946D75B59C2F953D_terseLabel_en-US" xlink:label="lab_us-gaap_Goodwill_C088CB28B7A4DF9B946D75B59C2F953D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Goodwill (Note 8) </link:label>

<link:label id="lab_us-gaap_Goodwill_C088CB28B7A4DF9B946D75B59C2F953D_label_en-US" xlink:label="lab_us-gaap_Goodwill_C088CB28B7A4DF9B946D75B59C2F953D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Goodwill </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_C088CB28B7A4DF9B946D75B59C2F953D" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Goodwill_C088CB28B7A4DF9B946D75B59C2F953D" xlink:to="lab_us-gaap_Goodwill_C088CB28B7A4DF9B946D75B59C2F953D" xlink:type="arc"/>

<link:label id="lab_us-gaap_IntangibleAssetsNetExcludingGoodwill_C159CA9BED879C90854E75B59C2F681A_terseLabel_en-US" xlink:label="lab_us-gaap_IntangibleAssetsNetExcludingGoodwill_C159CA9BED879C90854E75B59C2F681A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other intangible assets, net (Note 8) </link:label>

<link:label id="lab_us-gaap_IntangibleAssetsNetExcludingGoodwill_C159CA9BED879C90854E75B59C2F681A_label_en-US" xlink:label="lab_us-gaap_IntangibleAssetsNetExcludingGoodwill_C159CA9BED879C90854E75B59C2F681A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Intangible Assets, Net (Excluding Goodwill) </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_C159CA9BED879C90854E75B59C2F681A" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_C159CA9BED879C90854E75B59C2F681A" xlink:to="lab_us-gaap_IntangibleAssetsNetExcludingGoodwill_C159CA9BED879C90854E75B59C2F681A" xlink:type="arc"/>

<link:label id="lab_us-gaap_OtherAssetsNoncurrent_ABA5AD8ACFA44B70E76D75B59C2F2F51_terseLabel_en-US" xlink:label="lab_us-gaap_OtherAssetsNoncurrent_ABA5AD8ACFA44B70E76D75B59C2F2F51" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other non-current assets, net (Note 4) </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_ABA5AD8ACFA44B70E76D75B59C2F2F51" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherAssetsNoncurrent_ABA5AD8ACFA44B70E76D75B59C2F2F51" xlink:to="lab_us-gaap_OtherAssetsNoncurrent_ABA5AD8ACFA44B70E76D75B59C2F2F51" xlink:type="arc"/>

<link:label id="lab_us-gaap_Assets_BFAC58FF1DD0DA1832DB75B59C2F80B8_totalLabel_en-US" xlink:label="lab_us-gaap_Assets_BFAC58FF1DD0DA1832DB75B59C2F80B8" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total assets </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_BFAC58FF1DD0DA1832DB75B59C2F80B8" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Assets_BFAC58FF1DD0DA1832DB75B59C2F80B8" xlink:to="lab_us-gaap_Assets_BFAC58FF1DD0DA1832DB75B59C2F80B8" xlink:type="arc"/>

<link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_DF45EC763ED5051CA2D975B59C304CC5_terseLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_DF45EC763ED5051CA2D975B59C304CC5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Liabilities and Stockholders’ Equity </link:label>

<link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_DF45EC763ED5051CA2D975B59C304CC5_label_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_DF45EC763ED5051CA2D975B59C304CC5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Liabilities and Equity [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_DF45EC763ED5051CA2D975B59C304CC5" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_DF45EC763ED5051CA2D975B59C304CC5" xlink:to="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_DF45EC763ED5051CA2D975B59C304CC5" xlink:type="arc"/>

<link:label id="lab_us-gaap_AccountsPayableCurrent_2CB6E42A0A5F6DEF349075B59C3097CB_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsPayableCurrent_2CB6E42A0A5F6DEF349075B59C3097CB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accounts payable </link:label>

<link:label id="lab_us-gaap_AccountsPayableCurrent_2CB6E42A0A5F6DEF349075B59C3097CB_label_en-US" xlink:label="lab_us-gaap_AccountsPayableCurrent_2CB6E42A0A5F6DEF349075B59C3097CB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accounts Payable, Current </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountsPayableCurrent" xlink:label="loc_us-gaap_AccountsPayableCurrent_2CB6E42A0A5F6DEF349075B59C3097CB" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccountsPayableCurrent_2CB6E42A0A5F6DEF349075B59C3097CB" xlink:to="lab_us-gaap_AccountsPayableCurrent_2CB6E42A0A5F6DEF349075B59C3097CB" xlink:type="arc"/>

<link:label id="lab_us-gaap_BankOverdrafts_C71FE1BA06CBBEA1448475B59C305F48_terseLabel_en-US" xlink:label="lab_us-gaap_BankOverdrafts_C71FE1BA06CBBEA1448475B59C305F48" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Book overdrafts (Note 2) </link:label>

<link:label id="lab_us-gaap_BankOverdrafts_C71FE1BA06CBBEA1448475B59C305F48_label_en-US" xlink:label="lab_us-gaap_BankOverdrafts_C71FE1BA06CBBEA1448475B59C305F48" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Bank Overdrafts </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BankOverdrafts" xlink:label="loc_us-gaap_BankOverdrafts_C71FE1BA06CBBEA1448475B59C305F48" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BankOverdrafts_C71FE1BA06CBBEA1448475B59C305F48" xlink:to="lab_us-gaap_BankOverdrafts_C71FE1BA06CBBEA1448475B59C305F48" xlink:type="arc"/>

<link:label id="lab_core_CigaretteAndTobaccoTaxesPayable_1472599F6DAFAADDCB5375B59C31647A_terseLabel_en-US" xlink:label="lab_core_CigaretteAndTobaccoTaxesPayable_1472599F6DAFAADDCB5375B59C31647A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cigarette and tobacco taxes payable </link:label>

<link:label id="lab_core_CigaretteAndTobaccoTaxesPayable_1472599F6DAFAADDCB5375B59C31647A_label_en-US" xlink:label="lab_core_CigaretteAndTobaccoTaxesPayable_1472599F6DAFAADDCB5375B59C31647A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cigarette and Tobacco Taxes Payable </link:label>

<link:label id="lab_core_CigaretteAndTobaccoTaxesPayable_1472599F6DAFAADDCB5375B59C31647A_documentation_en-US" xlink:label="lab_core_CigaretteAndTobaccoTaxesPayable_1472599F6DAFAADDCB5375B59C31647A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Carrying value as of the balance sheet date of obligations incurred and payable for statutory cigarette and tobacco taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). </link:label>

<link:loc xlink:href="core-20191231.xsd#core_CigaretteAndTobaccoTaxesPayable" xlink:label="loc_core_CigaretteAndTobaccoTaxesPayable_1472599F6DAFAADDCB5375B59C31647A" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_CigaretteAndTobaccoTaxesPayable_1472599F6DAFAADDCB5375B59C31647A" xlink:to="lab_core_CigaretteAndTobaccoTaxesPayable_1472599F6DAFAADDCB5375B59C31647A" xlink:type="arc"/>

<link:label id="lab_us-gaap_AccruedLiabilitiesCurrent_4F2801523EA88E7DB07E75B59C311C1F_terseLabel_en-US" xlink:label="lab_us-gaap_AccruedLiabilitiesCurrent_4F2801523EA88E7DB07E75B59C311C1F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accrued liabilities (Note 4) </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_4F2801523EA88E7DB07E75B59C311C1F" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_4F2801523EA88E7DB07E75B59C311C1F" xlink:to="lab_us-gaap_AccruedLiabilitiesCurrent_4F2801523EA88E7DB07E75B59C311C1F" xlink:type="arc"/>

<link:label id="lab_us-gaap_LiabilitiesCurrent_546C748D43205447725F75B59C3118B2_totalLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrent_546C748D43205447725F75B59C3118B2" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total current liabilities </link:label>

<link:label id="lab_us-gaap_LiabilitiesCurrent_546C748D43205447725F75B59C3118B2_label_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrent_546C748D43205447725F75B59C3118B2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Liabilities, Current </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaap_LiabilitiesCurrent_546C748D43205447725F75B59C3118B2" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LiabilitiesCurrent_546C748D43205447725F75B59C3118B2" xlink:to="lab_us-gaap_LiabilitiesCurrent_546C748D43205447725F75B59C3118B2" xlink:type="arc"/>

<link:label id="lab_us-gaap_LongTermDebtAndCapitalLeaseObligations_526781F2FC36595E39E275B59C31D7FC_verboseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtAndCapitalLeaseObligations_526781F2FC36595E39E275B59C31D7FC" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Long-term debt (Note 9) </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_526781F2FC36595E39E275B59C31D7FC" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_526781F2FC36595E39E275B59C31D7FC" xlink:to="lab_us-gaap_LongTermDebtAndCapitalLeaseObligations_526781F2FC36595E39E275B59C31D7FC" xlink:type="arc"/>

<link:label id="lab_us-gaap_DeferredIncomeTaxLiabilitiesNet_18A810C8277F2F32FD6575B59C31012F_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxLiabilitiesNet_18A810C8277F2F32FD6575B59C31012F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Deferred income taxes (Note 11) </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_18A810C8277F2F32FD6575B59C31012F" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_18A810C8277F2F32FD6575B59C31012F" xlink:to="lab_us-gaap_DeferredIncomeTaxLiabilitiesNet_18A810C8277F2F32FD6575B59C31012F" xlink:type="arc"/>

<link:label id="lab_us-gaap_OtherLiabilitiesNoncurrent_95107E80CF14DE3CB5B375B59C323F03_terseLabel_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesNoncurrent_95107E80CF14DE3CB5B375B59C323F03" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other long-term liabilities </link:label>

<link:label id="lab_us-gaap_OtherLiabilitiesNoncurrent_95107E80CF14DE3CB5B375B59C323F03_label_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesNoncurrent_95107E80CF14DE3CB5B375B59C323F03" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Liabilities, Noncurrent </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_95107E80CF14DE3CB5B375B59C323F03" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrent_95107E80CF14DE3CB5B375B59C323F03" xlink:to="lab_us-gaap_OtherLiabilitiesNoncurrent_95107E80CF14DE3CB5B375B59C323F03" xlink:type="arc"/>

<link:label id="lab_core_LiabilityForClaimsAndClaimsAdjustmentExpenseLongTerm_2E552A343D8D23933E9675B59C329F08_terseLabel_en-US" xlink:label="lab_core_LiabilityForClaimsAndClaimsAdjustmentExpenseLongTerm_2E552A343D8D23933E9675B59C329F08" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Claims liabilities (Note 2) </link:label>

<link:label id="lab_core_LiabilityForClaimsAndClaimsAdjustmentExpenseLongTerm_2E552A343D8D23933E9675B59C329F08_label_en-US" xlink:label="lab_core_LiabilityForClaimsAndClaimsAdjustmentExpenseLongTerm_2E552A343D8D23933E9675B59C329F08" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Liability for Claims and Claims Adjustment Expense, Long-Term </link:label>

<link:label id="lab_core_LiabilityForClaimsAndClaimsAdjustmentExpenseLongTerm_2E552A343D8D23933E9675B59C329F08_documentation_en-US" xlink:label="lab_core_LiabilityForClaimsAndClaimsAdjustmentExpenseLongTerm_2E552A343D8D23933E9675B59C329F08" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Liability for Claims and Claims Adjustment Expense, Long-Term </link:label>

<link:loc xlink:href="core-20191231.xsd#core_LiabilityForClaimsAndClaimsAdjustmentExpenseLongTerm" xlink:label="loc_core_LiabilityForClaimsAndClaimsAdjustmentExpenseLongTerm_2E552A343D8D23933E9675B59C329F08" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_LiabilityForClaimsAndClaimsAdjustmentExpenseLongTerm_2E552A343D8D23933E9675B59C329F08" xlink:to="lab_core_LiabilityForClaimsAndClaimsAdjustmentExpenseLongTerm_2E552A343D8D23933E9675B59C329F08" xlink:type="arc"/>

<link:label id="lab_us-gaap_Liabilities_5000A8BA78E9CD58C6A575B59C321220_totalLabel_en-US" xlink:label="lab_us-gaap_Liabilities_5000A8BA78E9CD58C6A575B59C321220" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total liabilities </link:label>

<link:label id="lab_us-gaap_Liabilities_5000A8BA78E9CD58C6A575B59C321220_label_en-US" xlink:label="lab_us-gaap_Liabilities_5000A8BA78E9CD58C6A575B59C321220" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Liabilities </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_5000A8BA78E9CD58C6A575B59C321220" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Liabilities_5000A8BA78E9CD58C6A575B59C321220" xlink:to="lab_us-gaap_Liabilities_5000A8BA78E9CD58C6A575B59C321220" xlink:type="arc"/>

<link:label id="lab_us-gaap_CommitmentsAndContingencies_D3A223567CDE5AF203D475B59C320E16_terseLabel_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingencies_D3A223567CDE5AF203D475B59C320E16" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Commitments and contingencies (Note 10) </link:label>

<link:label id="lab_us-gaap_CommitmentsAndContingencies_D3A223567CDE5AF203D475B59C320E16_label_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingencies_D3A223567CDE5AF203D475B59C320E16" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Commitments and Contingencies </link:label>

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<link:label id="lab_us-gaap_CommonStockValue_740082B1FE28DF38F34075B59C335E8C_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockValue_740082B1FE28DF38F34075B59C335E8C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Common stock, $0.01 par value (150,000,000 shares authorized; 52,702,551 and 52,524,853 shares issued; 45,113,722 and 45,703,705 shares outstanding at December 31, 2019 and 2018, respectively) </link:label>

<link:label id="lab_us-gaap_CommonStockValue_740082B1FE28DF38F34075B59C335E8C_label_en-US" xlink:label="lab_us-gaap_CommonStockValue_740082B1FE28DF38F34075B59C335E8C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Common Stock, Value, Issued </link:label>

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<link:label id="lab_us-gaap_AdditionalPaidInCapital_67858777828DF5129D9875B59C3334C7_terseLabel_en-US" xlink:label="lab_us-gaap_AdditionalPaidInCapital_67858777828DF5129D9875B59C3334C7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Additional paid-in capital </link:label>

<link:label id="lab_us-gaap_AdditionalPaidInCapital_67858777828DF5129D9875B59C3334C7_label_en-US" xlink:label="lab_us-gaap_AdditionalPaidInCapital_67858777828DF5129D9875B59C3334C7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Additional Paid in Capital </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdditionalPaidInCapital" xlink:label="loc_us-gaap_AdditionalPaidInCapital_67858777828DF5129D9875B59C3334C7" xlink:type="locator"/>

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<link:label id="lab_us-gaap_TreasuryStockValue_252C9DF841E87E892B0275B59C335CC3_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_TreasuryStockValue_252C9DF841E87E892B0275B59C335CC3" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Treasury stock at cost (7,588,829 and 6,821,148 shares of common stock at December 31, 2019 and 2018, respectively) </link:label>

<link:label id="lab_us-gaap_TreasuryStockValue_252C9DF841E87E892B0275B59C335CC3_label_en-US" xlink:label="lab_us-gaap_TreasuryStockValue_252C9DF841E87E892B0275B59C335CC3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Treasury Stock, Value </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TreasuryStockValue" xlink:label="loc_us-gaap_TreasuryStockValue_252C9DF841E87E892B0275B59C335CC3" xlink:type="locator"/>

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<link:label id="lab_us-gaap_RetainedEarningsAccumulatedDeficit_5343331ECE26BF3E4BB675B59C331575_terseLabel_en-US" xlink:label="lab_us-gaap_RetainedEarningsAccumulatedDeficit_5343331ECE26BF3E4BB675B59C331575" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Retained earnings </link:label>

<link:label id="lab_us-gaap_RetainedEarningsAccumulatedDeficit_5343331ECE26BF3E4BB675B59C331575_label_en-US" xlink:label="lab_us-gaap_RetainedEarningsAccumulatedDeficit_5343331ECE26BF3E4BB675B59C331575" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Retained Earnings (Accumulated Deficit) </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_5343331ECE26BF3E4BB675B59C331575" xlink:type="locator"/>

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<link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_3991F59ED0BA43F2096775B59C339610_terseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_3991F59ED0BA43F2096775B59C339610" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accumulated other comprehensive loss (Note 16) </link:label>

<link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_3991F59ED0BA43F2096775B59C339610_label_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_3991F59ED0BA43F2096775B59C339610" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accumulated Other Comprehensive Income (Loss), Net of Tax </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_3991F59ED0BA43F2096775B59C339610" xlink:type="locator"/>

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<link:label id="lab_us-gaap_StockholdersEquity_E6EE7591DF4A6A544A8575B59C33BE99_totalLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquity_E6EE7591DF4A6A544A8575B59C33BE99" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total stockholders’ equity </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_E6EE7591DF4A6A544A8575B59C33BE99" xlink:type="locator"/>

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<link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquity_1DD078679D6859A5FC7875B59C341581_totalLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquity_1DD078679D6859A5FC7875B59C341581" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total liabilities and stockholders’ equity </link:label>

<link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquity_1DD078679D6859A5FC7875B59C341581_label_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquity_1DD078679D6859A5FC7875B59C341581" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Liabilities and Equity </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_1DD078679D6859A5FC7875B59C341581" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_1DD078679D6859A5FC7875B59C341581" xlink:to="lab_us-gaap_LiabilitiesAndStockholdersEquity_1DD078679D6859A5FC7875B59C341581" xlink:type="arc"/>

<link:label id="lab_srt_ConsolidationItemsAxis_C09913C17FD9C039A9BA75B59A3C7A5E_terseLabel_en-US" xlink:label="lab_srt_ConsolidationItemsAxis_C09913C17FD9C039A9BA75B59A3C7A5E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Consolidation Items [Axis] </link:label>

<link:label id="lab_srt_ConsolidationItemsAxis_C09913C17FD9C039A9BA75B59A3C7A5E_label_en-US" xlink:label="lab_srt_ConsolidationItemsAxis_C09913C17FD9C039A9BA75B59A3C7A5E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Consolidation Items [Axis] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidationItemsAxis" xlink:label="loc_srt_ConsolidationItemsAxis_C09913C17FD9C039A9BA75B59A3C7A5E" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_ConsolidationItemsAxis_C09913C17FD9C039A9BA75B59A3C7A5E" xlink:to="lab_srt_ConsolidationItemsAxis_C09913C17FD9C039A9BA75B59A3C7A5E" xlink:type="arc"/>

<link:label id="lab_srt_ConsolidationItemsDomain_6168E3C5BF1470E9A03775B59A3C8AC1_terseLabel_en-US" xlink:label="lab_srt_ConsolidationItemsDomain_6168E3C5BF1470E9A03775B59A3C8AC1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Consolidation Items [Domain] </link:label>

<link:label id="lab_srt_ConsolidationItemsDomain_6168E3C5BF1470E9A03775B59A3C8AC1_label_en-US" xlink:label="lab_srt_ConsolidationItemsDomain_6168E3C5BF1470E9A03775B59A3C8AC1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Consolidation Items [Domain] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidationItemsDomain" xlink:label="loc_srt_ConsolidationItemsDomain_6168E3C5BF1470E9A03775B59A3C8AC1" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_ConsolidationItemsDomain_6168E3C5BF1470E9A03775B59A3C8AC1" xlink:to="lab_srt_ConsolidationItemsDomain_6168E3C5BF1470E9A03775B59A3C8AC1" xlink:type="arc"/>

<link:label id="lab_srt_ReportableGeographicalComponentsMember_17AE821506AA333B5FC875B59A3CF490_terseLabel_en-US" xlink:label="lab_srt_ReportableGeographicalComponentsMember_17AE821506AA333B5FC875B59A3CF490" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Reportable Geographical Components </link:label>

<link:label id="lab_srt_ReportableGeographicalComponentsMember_17AE821506AA333B5FC875B59A3CF490_label_en-US" xlink:label="lab_srt_ReportableGeographicalComponentsMember_17AE821506AA333B5FC875B59A3CF490" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Reportable Geographical Components [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ReportableGeographicalComponentsMember" xlink:label="loc_srt_ReportableGeographicalComponentsMember_17AE821506AA333B5FC875B59A3CF490" xlink:type="locator"/>

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<link:label id="lab_us-gaap_CorporateNonSegmentMember_106B8F423EDDB038624675B59A3C9660_terseLabel_en-US" xlink:label="lab_us-gaap_CorporateNonSegmentMember_106B8F423EDDB038624675B59A3C9660" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Corporate, Non-Segment </link:label>

<link:label id="lab_us-gaap_CorporateNonSegmentMember_106B8F423EDDB038624675B59A3C9660_label_en-US" xlink:label="lab_us-gaap_CorporateNonSegmentMember_106B8F423EDDB038624675B59A3C9660" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Corporate, Non-Segment [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CorporateNonSegmentMember" xlink:label="loc_us-gaap_CorporateNonSegmentMember_106B8F423EDDB038624675B59A3C9660" xlink:type="locator"/>

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<link:label id="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_770105AD1AC61034334375B59A3D39D2_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_770105AD1AC61034334375B59A3D39D2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Income (loss) before income taxes </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_770105AD1AC61034334375B59A3D39D2" xlink:type="locator"/>

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<link:label id="lab_us-gaap_InterestExpense_59A5A265B3121405F18975B59A3D1D7F_terseLabel_en-US" xlink:label="lab_us-gaap_InterestExpense_59A5A265B3121405F18975B59A3D1D7F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Interest expense, net </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestExpense" xlink:label="loc_us-gaap_InterestExpense_59A5A265B3121405F18975B59A3D1D7F" xlink:type="locator"/>

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<link:label id="lab_us-gaap_DepreciationDepletionAndAmortization_9D21189067D96FC52B4B75B59A3D3802_terseLabel_en-US" xlink:label="lab_us-gaap_DepreciationDepletionAndAmortization_9D21189067D96FC52B4B75B59A3D3802" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Depreciation and amortization </link:label>

<link:label id="lab_us-gaap_DepreciationDepletionAndAmortization_9D21189067D96FC52B4B75B59A3D3802_label_en-US" xlink:label="lab_us-gaap_DepreciationDepletionAndAmortization_9D21189067D96FC52B4B75B59A3D3802" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Depreciation, Depletion and Amortization </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DepreciationDepletionAndAmortization" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_9D21189067D96FC52B4B75B59A3D3802" xlink:type="locator"/>

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<link:label id="lab_core_CapitalExpenditures_B4BD422BDBD74A119DE475B59A3E626D_terseLabel_en-US" xlink:label="lab_core_CapitalExpenditures_B4BD422BDBD74A119DE475B59A3E626D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Capital expenditures </link:label>

<link:label id="lab_core_CapitalExpenditures_B4BD422BDBD74A119DE475B59A3E626D_label_en-US" xlink:label="lab_core_CapitalExpenditures_B4BD422BDBD74A119DE475B59A3E626D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Capital Expenditures </link:label>

<link:label id="lab_core_CapitalExpenditures_B4BD422BDBD74A119DE475B59A3E626D_documentation_en-US" xlink:label="lab_core_CapitalExpenditures_B4BD422BDBD74A119DE475B59A3E626D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Capital Expenditures </link:label>

<link:loc xlink:href="core-20191231.xsd#core_CapitalExpenditures" xlink:label="loc_core_CapitalExpenditures_B4BD422BDBD74A119DE475B59A3E626D" xlink:type="locator"/>

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<link:label id="lab_us-gaap_PensionExpense_32B54BF058342E64B51975B59A3E4F7B_terseLabel_en-US" xlink:label="lab_us-gaap_PensionExpense_32B54BF058342E64B51975B59A3E4F7B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Pension cost </link:label>

<link:label id="lab_us-gaap_PensionExpense_32B54BF058342E64B51975B59A3E4F7B_label_en-US" xlink:label="lab_us-gaap_PensionExpense_32B54BF058342E64B51975B59A3E4F7B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Pension Cost (Reversal of Cost) </link:label>

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<link:label id="lab_us-gaap_SubsequentEventTypeDomain_4DB8D4FD81CBBE7BDE0399C2E6BEF15F_label_en-US" xlink:label="lab_us-gaap_SubsequentEventTypeDomain_4DB8D4FD81CBBE7BDE0399C2E6BEF15F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Subsequent Event Type [Domain] </link:label>

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<link:label id="lab_us-gaap_PropertyPlantAndEquipmentAbstract_7EED11F038CFC8DE7F458E6A5B9168C1_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentAbstract_7EED11F038CFC8DE7F458E6A5B9168C1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentAbstract" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAbstract_7EED11F038CFC8DE7F458E6A5B9168C1" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentAbstract_7EED11F038CFC8DE7F458E6A5B9168C1" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentAbstract_7EED11F038CFC8DE7F458E6A5B9168C1" xlink:type="arc"/>

<link:label id="lab_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_A7EFDC1389894FC0F2808E6A5B91FF92_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_A7EFDC1389894FC0F2808E6A5B91FF92" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Property, Plant and Equipment [Table] </link:label>

<link:label id="lab_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_A7EFDC1389894FC0F2808E6A5B91FF92_label_en-US" xlink:label="lab_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_A7EFDC1389894FC0F2808E6A5B91FF92" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment [Table] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_A7EFDC1389894FC0F2808E6A5B91FF92" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_A7EFDC1389894FC0F2808E6A5B91FF92" xlink:to="lab_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_A7EFDC1389894FC0F2808E6A5B91FF92" xlink:type="arc"/>

<link:label id="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis_E94DC05D4D68C62F9AA08E6A5B92E595_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis_E94DC05D4D68C62F9AA08E6A5B92E595" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment, Type [Axis] </link:label>

<link:label id="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis_E94DC05D4D68C62F9AA08E6A5B92E595_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis_E94DC05D4D68C62F9AA08E6A5B92E595" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment, Type [Axis] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_E94DC05D4D68C62F9AA08E6A5B92E595" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_E94DC05D4D68C62F9AA08E6A5B92E595" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis_E94DC05D4D68C62F9AA08E6A5B92E595" xlink:type="arc"/>

<link:label id="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain_51451528571C2707EFD38E6A5B9202CC_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain_51451528571C2707EFD38E6A5B9202CC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment, Type [Domain] </link:label>

<link:label id="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain_51451528571C2707EFD38E6A5B9202CC_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain_51451528571C2707EFD38E6A5B9202CC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment, Type [Domain] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_51451528571C2707EFD38E6A5B9202CC" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_51451528571C2707EFD38E6A5B9202CC" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain_51451528571C2707EFD38E6A5B9202CC" xlink:type="arc"/>

<link:label id="lab_us-gaap_EquipmentMember_9D566841750B3AE4F41B8E6A5B92F41E_terseLabel_en-US" xlink:label="lab_us-gaap_EquipmentMember_9D566841750B3AE4F41B8E6A5B92F41E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Delivery, warehouse and office equipment </link:label>

<link:label id="lab_us-gaap_EquipmentMember_9D566841750B3AE4F41B8E6A5B92F41E_label_en-US" xlink:label="lab_us-gaap_EquipmentMember_9D566841750B3AE4F41B8E6A5B92F41E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Equipment [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquipmentMember" xlink:label="loc_us-gaap_EquipmentMember_9D566841750B3AE4F41B8E6A5B92F41E" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EquipmentMember_9D566841750B3AE4F41B8E6A5B92F41E" xlink:to="lab_us-gaap_EquipmentMember_9D566841750B3AE4F41B8E6A5B92F41E" xlink:type="arc"/>

<link:label id="lab_us-gaap_LeaseholdImprovementsMember_FBE5505829239F91969C8E6A5B92A264_verboseLabel_en-US" xlink:label="lab_us-gaap_LeaseholdImprovementsMember_FBE5505829239F91969C8E6A5B92A264" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Leasehold improvements </link:label>

<link:label id="lab_us-gaap_LeaseholdImprovementsMember_FBE5505829239F91969C8E6A5B92A264_label_en-US" xlink:label="lab_us-gaap_LeaseholdImprovementsMember_FBE5505829239F91969C8E6A5B92A264" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Leasehold Improvements [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LeaseholdImprovementsMember" xlink:label="loc_us-gaap_LeaseholdImprovementsMember_FBE5505829239F91969C8E6A5B92A264" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LeaseholdImprovementsMember_FBE5505829239F91969C8E6A5B92A264" xlink:to="lab_us-gaap_LeaseholdImprovementsMember_FBE5505829239F91969C8E6A5B92A264" xlink:type="arc"/>

<link:label id="lab_us-gaap_LandAndBuildingMember_A18BD9F7733CD186AF898E6A5B930DF1_terseLabel_en-US" xlink:label="lab_us-gaap_LandAndBuildingMember_A18BD9F7733CD186AF898E6A5B930DF1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Land and buildings </link:label>

<link:label id="lab_us-gaap_LandAndBuildingMember_A18BD9F7733CD186AF898E6A5B930DF1_label_en-US" xlink:label="lab_us-gaap_LandAndBuildingMember_A18BD9F7733CD186AF898E6A5B930DF1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Land and Building [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LandAndBuildingMember" xlink:label="loc_us-gaap_LandAndBuildingMember_A18BD9F7733CD186AF898E6A5B930DF1" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LandAndBuildingMember_A18BD9F7733CD186AF898E6A5B930DF1" xlink:to="lab_us-gaap_LandAndBuildingMember_A18BD9F7733CD186AF898E6A5B930DF1" xlink:type="arc"/>

<link:label id="lab_us-gaap_ConstructionInProgressMember_C9FA7E708980308F1B4E8E6A5B93641A_terseLabel_en-US" xlink:label="lab_us-gaap_ConstructionInProgressMember_C9FA7E708980308F1B4E8E6A5B93641A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Construction in progress </link:label>

<link:label id="lab_us-gaap_ConstructionInProgressMember_C9FA7E708980308F1B4E8E6A5B93641A_label_en-US" xlink:label="lab_us-gaap_ConstructionInProgressMember_C9FA7E708980308F1B4E8E6A5B93641A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Construction in Progress [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConstructionInProgressMember" xlink:label="loc_us-gaap_ConstructionInProgressMember_C9FA7E708980308F1B4E8E6A5B93641A" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ConstructionInProgressMember_C9FA7E708980308F1B4E8E6A5B93641A" xlink:to="lab_us-gaap_ConstructionInProgressMember_C9FA7E708980308F1B4E8E6A5B93641A" xlink:type="arc"/>

<link:label id="lab_core_EquipmentUnderFinanceLeaseMember_448BDE93E35522B493718E8E66127127_terseLabel_en-US" xlink:label="lab_core_EquipmentUnderFinanceLeaseMember_448BDE93E35522B493718E8E66127127" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Equipment Under Finance Lease </link:label>

<link:label id="lab_core_EquipmentUnderFinanceLeaseMember_448BDE93E35522B493718E8E66127127_label_en-US" xlink:label="lab_core_EquipmentUnderFinanceLeaseMember_448BDE93E35522B493718E8E66127127" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Equipment Under Finance Lease [Member] </link:label>

<link:label id="lab_core_EquipmentUnderFinanceLeaseMember_448BDE93E35522B493718E8E66127127_documentation_en-US" xlink:label="lab_core_EquipmentUnderFinanceLeaseMember_448BDE93E35522B493718E8E66127127" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Equipment Under Finance Lease [Member] </link:label>

<link:loc xlink:href="core-20191231.xsd#core_EquipmentUnderFinanceLeaseMember" xlink:label="loc_core_EquipmentUnderFinanceLeaseMember_448BDE93E35522B493718E8E66127127" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_EquipmentUnderFinanceLeaseMember_448BDE93E35522B493718E8E66127127" xlink:to="lab_core_EquipmentUnderFinanceLeaseMember_448BDE93E35522B493718E8E66127127" xlink:type="arc"/>

<link:label id="lab_core_EquipmentHeldUnderCapitalLeasesMember_E2012793EBAB241804108E6A5B93953C_terseLabel_en-US" xlink:label="lab_core_EquipmentHeldUnderCapitalLeasesMember_E2012793EBAB241804108E6A5B93953C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Equipment capital leases </link:label>

<link:label id="lab_core_EquipmentHeldUnderCapitalLeasesMember_E2012793EBAB241804108E6A5B93953C_label_en-US" xlink:label="lab_core_EquipmentHeldUnderCapitalLeasesMember_E2012793EBAB241804108E6A5B93953C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Equipment Held under Capital Leases [Member] </link:label>

<link:label id="lab_core_EquipmentHeldUnderCapitalLeasesMember_E2012793EBAB241804108E6A5B93953C_documentation_en-US" xlink:label="lab_core_EquipmentHeldUnderCapitalLeasesMember_E2012793EBAB241804108E6A5B93953C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Equipment Held under Capital Leases [Member] </link:label>

<link:loc xlink:href="core-20191231.xsd#core_EquipmentHeldUnderCapitalLeasesMember" xlink:label="loc_core_EquipmentHeldUnderCapitalLeasesMember_E2012793EBAB241804108E6A5B93953C" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_EquipmentHeldUnderCapitalLeasesMember_E2012793EBAB241804108E6A5B93953C" xlink:to="lab_core_EquipmentHeldUnderCapitalLeasesMember_E2012793EBAB241804108E6A5B93953C" xlink:type="arc"/>

<link:label id="lab_us-gaap_BuildingMember_4CE85CED5EADA1F89D278E7E853AA2F8_terseLabel_en-US" xlink:label="lab_us-gaap_BuildingMember_4CE85CED5EADA1F89D278E7E853AA2F8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Buildings </link:label>

<link:label id="lab_us-gaap_BuildingMember_4CE85CED5EADA1F89D278E7E853AA2F8_label_en-US" xlink:label="lab_us-gaap_BuildingMember_4CE85CED5EADA1F89D278E7E853AA2F8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Building [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BuildingMember" xlink:label="loc_us-gaap_BuildingMember_4CE85CED5EADA1F89D278E7E853AA2F8" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BuildingMember_4CE85CED5EADA1F89D278E7E853AA2F8" xlink:to="lab_us-gaap_BuildingMember_4CE85CED5EADA1F89D278E7E853AA2F8" xlink:type="arc"/>

<link:label id="lab_core_WarehouseEquipmentMember_8F538ACA996A29DA11788E6A5B93F982_terseLabel_en-US" xlink:label="lab_core_WarehouseEquipmentMember_8F538ACA996A29DA11788E6A5B93F982" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Warehouse equipment </link:label>

<link:label id="lab_core_WarehouseEquipmentMember_8F538ACA996A29DA11788E6A5B93F982_label_en-US" xlink:label="lab_core_WarehouseEquipmentMember_8F538ACA996A29DA11788E6A5B93F982" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Warehouse Equipment [Member] </link:label>

<link:label id="lab_core_WarehouseEquipmentMember_8F538ACA996A29DA11788E6A5B93F982_documentation_en-US" xlink:label="lab_core_WarehouseEquipmentMember_8F538ACA996A29DA11788E6A5B93F982" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Warehouse Equipment [Member] </link:label>

<link:loc xlink:href="core-20191231.xsd#core_WarehouseEquipmentMember" xlink:label="loc_core_WarehouseEquipmentMember_8F538ACA996A29DA11788E6A5B93F982" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_WarehouseEquipmentMember_8F538ACA996A29DA11788E6A5B93F982" xlink:to="lab_core_WarehouseEquipmentMember_8F538ACA996A29DA11788E6A5B93F982" xlink:type="arc"/>

<link:label id="lab_us-gaap_PropertyPlantAndEquipmentLineItems_4C5E06976F47B3BC3A328E6A5B9369DA_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentLineItems_4C5E06976F47B3BC3A328E6A5B9369DA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment [Line Items] </link:label>

<link:label id="lab_us-gaap_PropertyPlantAndEquipmentLineItems_4C5E06976F47B3BC3A328E6A5B9369DA_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentLineItems_4C5E06976F47B3BC3A328E6A5B9369DA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment [Line Items] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_4C5E06976F47B3BC3A328E6A5B9369DA" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_4C5E06976F47B3BC3A328E6A5B9369DA" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentLineItems_4C5E06976F47B3BC3A328E6A5B9369DA" xlink:type="arc"/>

<link:label id="lab_us-gaap_PropertyPlantAndEquipmentGross_2C7D67B51025099AAE108E6A5B93D345_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentGross_2C7D67B51025099AAE108E6A5B93D345" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Property and equipment, gross </link:label>

<link:label id="lab_us-gaap_PropertyPlantAndEquipmentGross_2C7D67B51025099AAE108E6A5B93D345_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentGross_2C7D67B51025099AAE108E6A5B93D345" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment, Gross </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_2C7D67B51025099AAE108E6A5B93D345" xlink:type="locator"/>

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<link:label id="lab_core_PropertyPlantAndEquipmentAndFinanceLeaseRightofUseAssetBeforeAccumulatedDepreciationAndAmortization_201256D1B1AD2CA3FE498E6A5B94BD94_totalLabel_en-US" xlink:label="lab_core_PropertyPlantAndEquipmentAndFinanceLeaseRightofUseAssetBeforeAccumulatedDepreciationAndAmortization_201256D1B1AD2CA3FE498E6A5B94BD94" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Property and equipment, gross </link:label>

<link:label id="lab_core_PropertyPlantAndEquipmentAndFinanceLeaseRightofUseAssetBeforeAccumulatedDepreciationAndAmortization_201256D1B1AD2CA3FE498E6A5B94BD94_label_en-US" xlink:label="lab_core_PropertyPlantAndEquipmentAndFinanceLeaseRightofUseAssetBeforeAccumulatedDepreciationAndAmortization_201256D1B1AD2CA3FE498E6A5B94BD94" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant, And Equipment And Finance Lease Right-of-Use Asset, Before Accumulated Depreciation And Amortization </link:label>

<link:label id="lab_core_PropertyPlantAndEquipmentAndFinanceLeaseRightofUseAssetBeforeAccumulatedDepreciationAndAmortization_201256D1B1AD2CA3FE498E6A5B94BD94_documentation_en-US" xlink:label="lab_core_PropertyPlantAndEquipmentAndFinanceLeaseRightofUseAssetBeforeAccumulatedDepreciationAndAmortization_201256D1B1AD2CA3FE498E6A5B94BD94" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Property, Plant, And Equipment And Finance Lease Right-of-Use Asset, Before Accumulated Depreciation And Amortization </link:label>

<link:loc xlink:href="core-20191231.xsd#core_PropertyPlantAndEquipmentAndFinanceLeaseRightofUseAssetBeforeAccumulatedDepreciationAndAmortization" xlink:label="loc_core_PropertyPlantAndEquipmentAndFinanceLeaseRightofUseAssetBeforeAccumulatedDepreciationAndAmortization_201256D1B1AD2CA3FE498E6A5B94BD94" xlink:type="locator"/>

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<link:label id="lab_core_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_626FE8A94AD3E7E4D76E8E6A5B949442_negatedLabel_en-US" xlink:label="lab_core_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_626FE8A94AD3E7E4D76E8E6A5B949442" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Less: Accumulated depreciation and amortization </link:label>

<link:label id="lab_core_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_626FE8A94AD3E7E4D76E8E6A5B949442_label_en-US" xlink:label="lab_core_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_626FE8A94AD3E7E4D76E8E6A5B949442" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant, And Equipment And Finance Lease Right-Of-Use Asset, Accumulated Depreciation And Amortization </link:label>

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<link:label id="lab_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_854FD108E2F23226FCF28E6A5B9440C7_label_en-US" xlink:label="lab_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_854FD108E2F23226FCF28E6A5B9440C7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment </link:label>

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<link:label id="lab_core_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_DBBE50116D8B0EC4AFFA8E6A5B94E1D8_totalLabel_en-US" xlink:label="lab_core_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_DBBE50116D8B0EC4AFFA8E6A5B94E1D8" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total property and equipment, net </link:label>

<link:label id="lab_core_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_DBBE50116D8B0EC4AFFA8E6A5B94E1D8_label_en-US" xlink:label="lab_core_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_DBBE50116D8B0EC4AFFA8E6A5B94E1D8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant, And Equipment And Finance Lease Right-Of-Use Asset, After Accumulated Depreciation And Amortization </link:label>

<link:label id="lab_core_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_DBBE50116D8B0EC4AFFA8E6A5B94E1D8_documentation_en-US" xlink:label="lab_core_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_DBBE50116D8B0EC4AFFA8E6A5B94E1D8" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Property, Plant, And Equipment And Finance Lease Right-Of-Use Asset, After Accumulated Depreciation And Amortization </link:label>

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<link:label id="lab_us-gaap_PropertyPlantAndEquipmentNet_A8AF00EB5841E3BA66508E6A5B9491E7_totalLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_A8AF00EB5841E3BA66508E6A5B9491E7" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total property and equipment, net </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_A8AF00EB5841E3BA66508E6A5B9491E7" xlink:type="locator"/>

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<link:label id="lab_core_DepreciationAndAmortizationExpenses_3A2B8D8F6FFD543A47BE8E6A5B942D0F_terseLabel_en-US" xlink:label="lab_core_DepreciationAndAmortizationExpenses_3A2B8D8F6FFD543A47BE8E6A5B942D0F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Depreciation and amortization expenses </link:label>

<link:label id="lab_core_DepreciationAndAmortizationExpenses_3A2B8D8F6FFD543A47BE8E6A5B942D0F_label_en-US" xlink:label="lab_core_DepreciationAndAmortizationExpenses_3A2B8D8F6FFD543A47BE8E6A5B942D0F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Depreciation and Amortization Expenses </link:label>

<link:label id="lab_core_DepreciationAndAmortizationExpenses_3A2B8D8F6FFD543A47BE8E6A5B942D0F_documentation_en-US" xlink:label="lab_core_DepreciationAndAmortizationExpenses_3A2B8D8F6FFD543A47BE8E6A5B942D0F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Depreciation and Amortization Expenses </link:label>

<link:loc xlink:href="core-20191231.xsd#core_DepreciationAndAmortizationExpenses" xlink:label="loc_core_DepreciationAndAmortizationExpenses_3A2B8D8F6FFD543A47BE8E6A5B942D0F" xlink:type="locator"/>

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<link:label id="lab_us-gaap_QuarterlyFinancialDataAbstract_D1D6D37DE8B1CA07917999C2E5CAAC6E_label_en-US" xlink:label="lab_us-gaap_QuarterlyFinancialDataAbstract_D1D6D37DE8B1CA07917999C2E5CAAC6E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Quarterly Financial Data [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_QuarterlyFinancialDataAbstract" xlink:label="loc_us-gaap_QuarterlyFinancialDataAbstract_D1D6D37DE8B1CA07917999C2E5CAAC6E" xlink:type="locator"/>

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<link:label id="lab_core_QuarterlyFinancialInformationTable_6EB2B1818C7AC19E6C2699C2E5CAC712_terseLabel_en-US" xlink:label="lab_core_QuarterlyFinancialInformationTable_6EB2B1818C7AC19E6C2699C2E5CAC712" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Quarterly Financial Information [Table] </link:label>

<link:label id="lab_core_QuarterlyFinancialInformationTable_6EB2B1818C7AC19E6C2699C2E5CAC712_label_en-US" xlink:label="lab_core_QuarterlyFinancialInformationTable_6EB2B1818C7AC19E6C2699C2E5CAC712" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Quarterly Financial Information [Table] </link:label>

<link:label id="lab_core_QuarterlyFinancialInformationTable_6EB2B1818C7AC19E6C2699C2E5CAC712_documentation_en-US" xlink:label="lab_core_QuarterlyFinancialInformationTable_6EB2B1818C7AC19E6C2699C2E5CAC712" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Quarterly Financial Information [Table] </link:label>

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<link:label id="lab_core_TotalFoodNonFoodProductsMember_1D4AE775C76A6512D37599C2E5CD5227_verboseLabel_en-US" xlink:label="lab_core_TotalFoodNonFoodProductsMember_1D4AE775C76A6512D37599C2E5CD5227" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Food/non-food </link:label>

<link:loc xlink:href="core-20191231.xsd#core_TotalFoodNonFoodProductsMember" xlink:label="loc_core_TotalFoodNonFoodProductsMember_1D4AE775C76A6512D37599C2E5CD5227" xlink:type="locator"/>

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<link:label id="lab_core_QuarterlyFinancialInformationLineItems_0129CDD419BA767B311599C2E5CD8E12_terseLabel_en-US" xlink:label="lab_core_QuarterlyFinancialInformationLineItems_0129CDD419BA767B311599C2E5CD8E12" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Quarterly Financial Information [Line Items] </link:label>

<link:label id="lab_core_QuarterlyFinancialInformationLineItems_0129CDD419BA767B311599C2E5CD8E12_label_en-US" xlink:label="lab_core_QuarterlyFinancialInformationLineItems_0129CDD419BA767B311599C2E5CD8E12" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Quarterly Financial Information [Line Items] </link:label>

<link:label id="lab_core_QuarterlyFinancialInformationLineItems_0129CDD419BA767B311599C2E5CD8E12_documentation_en-US" xlink:label="lab_core_QuarterlyFinancialInformationLineItems_0129CDD419BA767B311599C2E5CD8E12" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> [Line Items] for Quarterly Financial Information [Table] </link:label>

<link:loc xlink:href="core-20191231.xsd#core_QuarterlyFinancialInformationLineItems" xlink:label="loc_core_QuarterlyFinancialInformationLineItems_0129CDD419BA767B311599C2E5CD8E12" xlink:type="locator"/>

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<link:label id="lab_us-gaap_IncomeTaxExpenseBenefit_AAB14B686A9DE37F953599C2E5D071FE_negatedLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxExpenseBenefit_AAB14B686A9DE37F953599C2E5D071FE" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Income tax provision </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_AAB14B686A9DE37F953599C2E5D071FE" xlink:type="locator"/>

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<link:label id="lab_us-gaap_EarningsPerShareBasic_C2F4B60CF381AE6FCB4499C2E5D003CA_verboseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareBasic_C2F4B60CF381AE6FCB4499C2E5D003CA" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Basic net income per common share (in dollars per share) </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareBasic" xlink:label="loc_us-gaap_EarningsPerShareBasic_C2F4B60CF381AE6FCB4499C2E5D003CA" xlink:type="locator"/>

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<link:label id="lab_us-gaap_EarningsPerShareDiluted_F72E649B53B9A730076D99C2E5D1D752_verboseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareDiluted_F72E649B53B9A730076D99C2E5D1D752" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Diluted net income per common share (in dollars per share) </link:label>

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<link:label id="lab_us-gaap_ExciseAndSalesTaxes_EFED47B2743975921E9099C2E5D1075D_terseLabel_en-US" xlink:label="lab_us-gaap_ExciseAndSalesTaxes_EFED47B2743975921E9099C2E5D1075D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Excise taxes </link:label>

<link:label id="lab_us-gaap_ExciseAndSalesTaxes_EFED47B2743975921E9099C2E5D1075D_label_en-US" xlink:label="lab_us-gaap_ExciseAndSalesTaxes_EFED47B2743975921E9099C2E5D1075D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Excise and Sales Taxes </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ExciseAndSalesTaxes" xlink:label="loc_us-gaap_ExciseAndSalesTaxes_EFED47B2743975921E9099C2E5D1075D" xlink:type="locator"/>

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<link:label id="lab_core_InventoryHoldingGains_EE51D877B45AA70019CC99C2E5D12199_terseLabel_en-US" xlink:label="lab_core_InventoryHoldingGains_EE51D877B45AA70019CC99C2E5D12199" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cigarette inventory holding gains </link:label>

<link:label id="lab_core_InventoryHoldingGains_EE51D877B45AA70019CC99C2E5D12199_label_en-US" xlink:label="lab_core_InventoryHoldingGains_EE51D877B45AA70019CC99C2E5D12199" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Inventory Holding Gains </link:label>

<link:label id="lab_core_InventoryHoldingGains_EE51D877B45AA70019CC99C2E5D12199_documentation_en-US" xlink:label="lab_core_InventoryHoldingGains_EE51D877B45AA70019CC99C2E5D12199" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Inventory Holding Gains </link:label>

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<link:label id="lab_core_InventoryTaxStampHoldingGain_D750E1D17973ADEED9D899C2E5D15A12_terseLabel_en-US" xlink:label="lab_core_InventoryTaxStampHoldingGain_D750E1D17973ADEED9D899C2E5D15A12" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cigarette tax stamp inventory holding gains </link:label>

<link:label id="lab_core_InventoryTaxStampHoldingGain_D750E1D17973ADEED9D899C2E5D15A12_label_en-US" xlink:label="lab_core_InventoryTaxStampHoldingGain_D750E1D17973ADEED9D899C2E5D15A12" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Inventory Tax Stamp Holding Gain </link:label>

<link:label id="lab_core_InventoryTaxStampHoldingGain_D750E1D17973ADEED9D899C2E5D15A12_documentation_en-US" xlink:label="lab_core_InventoryTaxStampHoldingGain_D750E1D17973ADEED9D899C2E5D15A12" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Inventory Tax Stamp Holding Gains </link:label>

<link:loc xlink:href="core-20191231.xsd#core_InventoryTaxStampHoldingGain" xlink:label="loc_core_InventoryTaxStampHoldingGain_D750E1D17973ADEED9D899C2E5D15A12" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_InventoryTaxStampHoldingGain_D750E1D17973ADEED9D899C2E5D15A12" xlink:to="lab_core_InventoryTaxStampHoldingGain_D750E1D17973ADEED9D899C2E5D15A12" xlink:type="arc"/>

<link:label id="lab_us-gaap_InventoryLIFOReserveEffectOnIncomeNet_76F43D01D488E2A8426099C2E5D7C087_terseLabel_en-US" xlink:label="lab_us-gaap_InventoryLIFOReserveEffectOnIncomeNet_76F43D01D488E2A8426099C2E5D7C087" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> LIFO expense </link:label>

<link:label id="lab_us-gaap_InventoryLIFOReserveEffectOnIncomeNet_76F43D01D488E2A8426099C2E5D7C087_label_en-US" xlink:label="lab_us-gaap_InventoryLIFOReserveEffectOnIncomeNet_76F43D01D488E2A8426099C2E5D7C087" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Inventory, LIFO Reserve, Effect on Income, Net </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InventoryLIFOReserveEffectOnIncomeNet" xlink:label="loc_us-gaap_InventoryLIFOReserveEffectOnIncomeNet_76F43D01D488E2A8426099C2E5D7C087" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InventoryLIFOReserveEffectOnIncomeNet_76F43D01D488E2A8426099C2E5D7C087" xlink:to="lab_us-gaap_InventoryLIFOReserveEffectOnIncomeNet_76F43D01D488E2A8426099C2E5D7C087" xlink:type="arc"/>

<link:label id="lab_us-gaap_AllocatedShareBasedCompensationExpense_C72918855FA89D88FCDF99C2E5D7A75E_terseLabel_en-US" xlink:label="lab_us-gaap_AllocatedShareBasedCompensationExpense_C72918855FA89D88FCDF99C2E5D7A75E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Stock-based compensation </link:label>

<link:label id="lab_us-gaap_AllocatedShareBasedCompensationExpense_C72918855FA89D88FCDF99C2E5D7A75E_label_en-US" xlink:label="lab_us-gaap_AllocatedShareBasedCompensationExpense_C72918855FA89D88FCDF99C2E5D7A75E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Payment Arrangement, Expense </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_C72918855FA89D88FCDF99C2E5D7A75E" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AllocatedShareBasedCompensationExpense_C72918855FA89D88FCDF99C2E5D7A75E" xlink:to="lab_us-gaap_AllocatedShareBasedCompensationExpense_C72918855FA89D88FCDF99C2E5D7A75E" xlink:type="arc"/>

<link:label id="lab_us-gaap_BusinessCombinationAcquisitionRelatedCosts_F6C00C156E8723E5E77699C2E5D841E9_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessCombinationAcquisitionRelatedCosts_F6C00C156E8723E5E77699C2E5D841E9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Business integration costs </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_F6C00C156E8723E5E77699C2E5D841E9" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_F6C00C156E8723E5E77699C2E5D841E9" xlink:to="lab_us-gaap_BusinessCombinationAcquisitionRelatedCosts_F6C00C156E8723E5E77699C2E5D841E9" xlink:type="arc"/>

<link:label id="lab_core_SellingGeneralandAdministrativeExpensesAcquisitionandIntegrationExpenses_C1CCD8AD80E637A2E07F99C2E5D8D23E_terseLabel_en-US" xlink:label="lab_core_SellingGeneralandAdministrativeExpensesAcquisitionandIntegrationExpenses_C1CCD8AD80E637A2E07F99C2E5D8D23E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Selling, general & administrative expenses </link:label>

<link:label id="lab_core_SellingGeneralandAdministrativeExpensesAcquisitionandIntegrationExpenses_C1CCD8AD80E637A2E07F99C2E5D8D23E_label_en-US" xlink:label="lab_core_SellingGeneralandAdministrativeExpensesAcquisitionandIntegrationExpenses_C1CCD8AD80E637A2E07F99C2E5D8D23E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Selling, General and Administrative Expenses, Acquisition and Integration Expenses </link:label>

<link:label id="lab_core_SellingGeneralandAdministrativeExpensesAcquisitionandIntegrationExpenses_C1CCD8AD80E637A2E07F99C2E5D8D23E_documentation_en-US" xlink:label="lab_core_SellingGeneralandAdministrativeExpensesAcquisitionandIntegrationExpenses_C1CCD8AD80E637A2E07F99C2E5D8D23E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Selling, General and Administrative Expenses, Acquisition and Integration Expenses </link:label>

<link:loc xlink:href="core-20191231.xsd#core_SellingGeneralandAdministrativeExpensesAcquisitionandIntegrationExpenses" xlink:label="loc_core_SellingGeneralandAdministrativeExpensesAcquisitionandIntegrationExpenses_C1CCD8AD80E637A2E07F99C2E5D8D23E" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_SellingGeneralandAdministrativeExpensesAcquisitionandIntegrationExpenses_C1CCD8AD80E637A2E07F99C2E5D8D23E" xlink:to="lab_core_SellingGeneralandAdministrativeExpensesAcquisitionandIntegrationExpenses_C1CCD8AD80E637A2E07F99C2E5D8D23E" xlink:type="arc"/>

<link:label id="lab_us-gaap_ScheduleOfDebtInstrumentsTextBlock_E5CFACB141DD090150CC75B59B09AEE9_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfDebtInstrumentsTextBlock_E5CFACB141DD090150CC75B59B09AEE9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Long-term Debt Instruments </link:label>

<link:label id="lab_us-gaap_ScheduleOfDebtInstrumentsTextBlock_E5CFACB141DD090150CC75B59B09AEE9_label_en-US" xlink:label="lab_us-gaap_ScheduleOfDebtInstrumentsTextBlock_E5CFACB141DD090150CC75B59B09AEE9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Long-term Debt Instruments [Table Text Block] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfDebtInstrumentsTextBlock" xlink:label="loc_us-gaap_ScheduleOfDebtInstrumentsTextBlock_E5CFACB141DD090150CC75B59B09AEE9" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfDebtInstrumentsTextBlock_E5CFACB141DD090150CC75B59B09AEE9" xlink:to="lab_us-gaap_ScheduleOfDebtInstrumentsTextBlock_E5CFACB141DD090150CC75B59B09AEE9" xlink:type="arc"/>

<link:label id="lab_us-gaap_InventoryDisclosureTextBlock_5DCCB78693BA3EEC5A6075B59B689575_terseLabel_en-US" xlink:label="lab_us-gaap_InventoryDisclosureTextBlock_5DCCB78693BA3EEC5A6075B59B689575" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Inventories, Net </link:label>

<link:label id="lab_us-gaap_InventoryDisclosureTextBlock_5DCCB78693BA3EEC5A6075B59B689575_label_en-US" xlink:label="lab_us-gaap_InventoryDisclosureTextBlock_5DCCB78693BA3EEC5A6075B59B689575" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Inventory Disclosure [Text Block] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InventoryDisclosureTextBlock" xlink:label="loc_us-gaap_InventoryDisclosureTextBlock_5DCCB78693BA3EEC5A6075B59B689575" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InventoryDisclosureTextBlock_5DCCB78693BA3EEC5A6075B59B689575" xlink:to="lab_us-gaap_InventoryDisclosureTextBlock_5DCCB78693BA3EEC5A6075B59B689575" xlink:type="arc"/>

<link:label id="lab_core_SelfInsuranceProgramsAxis_58FDC1D253D83ED92C6F75B59BAFD7F3_terseLabel_en-US" xlink:label="lab_core_SelfInsuranceProgramsAxis_58FDC1D253D83ED92C6F75B59BAFD7F3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Self-insurance Programs [Axis] </link:label>

<link:label id="lab_core_SelfInsuranceProgramsAxis_58FDC1D253D83ED92C6F75B59BAFD7F3_label_en-US" xlink:label="lab_core_SelfInsuranceProgramsAxis_58FDC1D253D83ED92C6F75B59BAFD7F3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Self-insurance Programs [Axis] </link:label>

<link:label id="lab_core_SelfInsuranceProgramsAxis_58FDC1D253D83ED92C6F75B59BAFD7F3_documentation_en-US" xlink:label="lab_core_SelfInsuranceProgramsAxis_58FDC1D253D83ED92C6F75B59BAFD7F3" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Self-insurance Programs [Axis] </link:label>

<link:loc xlink:href="core-20191231.xsd#core_SelfInsuranceProgramsAxis" xlink:label="loc_core_SelfInsuranceProgramsAxis_58FDC1D253D83ED92C6F75B59BAFD7F3" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_SelfInsuranceProgramsAxis_58FDC1D253D83ED92C6F75B59BAFD7F3" xlink:to="lab_core_SelfInsuranceProgramsAxis_58FDC1D253D83ED92C6F75B59BAFD7F3" xlink:type="arc"/>

<link:label id="lab_core_SelfInsuranceProgramsDomain_C9E9590F1A72CA68361775B59BAF5CA1_terseLabel_en-US" xlink:label="lab_core_SelfInsuranceProgramsDomain_C9E9590F1A72CA68361775B59BAF5CA1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Self-insurance Programs [Domain] </link:label>

<link:label id="lab_core_SelfInsuranceProgramsDomain_C9E9590F1A72CA68361775B59BAF5CA1_label_en-US" xlink:label="lab_core_SelfInsuranceProgramsDomain_C9E9590F1A72CA68361775B59BAF5CA1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Self-insurance Programs [Domain] </link:label>

<link:label id="lab_core_SelfInsuranceProgramsDomain_C9E9590F1A72CA68361775B59BAF5CA1_documentation_en-US" xlink:label="lab_core_SelfInsuranceProgramsDomain_C9E9590F1A72CA68361775B59BAF5CA1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> [Domain] for Self-insurance Programs [Axis] </link:label>

<link:loc xlink:href="core-20191231.xsd#core_SelfInsuranceProgramsDomain" xlink:label="loc_core_SelfInsuranceProgramsDomain_C9E9590F1A72CA68361775B59BAF5CA1" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_SelfInsuranceProgramsDomain_C9E9590F1A72CA68361775B59BAF5CA1" xlink:to="lab_core_SelfInsuranceProgramsDomain_C9E9590F1A72CA68361775B59BAF5CA1" xlink:type="arc"/>

<link:label id="lab_core_WorkersCompensationGeneralAndAutoLiabilitiesProgramMember_4A655E7FB85304CCE6AE75B59BAF6941_terseLabel_en-US" xlink:label="lab_core_WorkersCompensationGeneralAndAutoLiabilitiesProgramMember_4A655E7FB85304CCE6AE75B59BAF6941" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Workers' Compensation, General and Auto Liabilities Program </link:label>

<link:label id="lab_core_WorkersCompensationGeneralAndAutoLiabilitiesProgramMember_4A655E7FB85304CCE6AE75B59BAF6941_label_en-US" xlink:label="lab_core_WorkersCompensationGeneralAndAutoLiabilitiesProgramMember_4A655E7FB85304CCE6AE75B59BAF6941" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Workers' Compensation, General and Auto Liabilities Program [Member] </link:label>

<link:label id="lab_core_WorkersCompensationGeneralAndAutoLiabilitiesProgramMember_4A655E7FB85304CCE6AE75B59BAF6941_documentation_en-US" xlink:label="lab_core_WorkersCompensationGeneralAndAutoLiabilitiesProgramMember_4A655E7FB85304CCE6AE75B59BAF6941" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Workers' Compensation, General and Auto Liabilities Program [Member] </link:label>

<link:loc xlink:href="core-20191231.xsd#core_WorkersCompensationGeneralAndAutoLiabilitiesProgramMember" xlink:label="loc_core_WorkersCompensationGeneralAndAutoLiabilitiesProgramMember_4A655E7FB85304CCE6AE75B59BAF6941" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_WorkersCompensationGeneralAndAutoLiabilitiesProgramMember_4A655E7FB85304CCE6AE75B59BAF6941" xlink:to="lab_core_WorkersCompensationGeneralAndAutoLiabilitiesProgramMember_4A655E7FB85304CCE6AE75B59BAF6941" xlink:type="arc"/>

<link:label id="lab_core_HealthAndWelfareProgramMember_16381A5DA7123D3AE52275B59BAF6BDA_terseLabel_en-US" xlink:label="lab_core_HealthAndWelfareProgramMember_16381A5DA7123D3AE52275B59BAF6BDA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Health and Welfare Program </link:label>

<link:label id="lab_core_HealthAndWelfareProgramMember_16381A5DA7123D3AE52275B59BAF6BDA_label_en-US" xlink:label="lab_core_HealthAndWelfareProgramMember_16381A5DA7123D3AE52275B59BAF6BDA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Health and Welfare Program [Member] </link:label>

<link:label id="lab_core_HealthAndWelfareProgramMember_16381A5DA7123D3AE52275B59BAF6BDA_documentation_en-US" xlink:label="lab_core_HealthAndWelfareProgramMember_16381A5DA7123D3AE52275B59BAF6BDA" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Health and Welfare Program [Member] </link:label>

<link:loc xlink:href="core-20191231.xsd#core_HealthAndWelfareProgramMember" xlink:label="loc_core_HealthAndWelfareProgramMember_16381A5DA7123D3AE52275B59BAF6BDA" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_HealthAndWelfareProgramMember_16381A5DA7123D3AE52275B59BAF6BDA" xlink:to="lab_core_HealthAndWelfareProgramMember_16381A5DA7123D3AE52275B59BAF6BDA" xlink:type="arc"/>

<link:label id="lab_srt_MajorCustomersAxis_9C1D542BFA4CCD72495B75B59BB0BD15_terseLabel_en-US" xlink:label="lab_srt_MajorCustomersAxis_9C1D542BFA4CCD72495B75B59BB0BD15" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Major Customers [Axis] </link:label>

<link:label id="lab_srt_MajorCustomersAxis_9C1D542BFA4CCD72495B75B59BB0BD15_label_en-US" xlink:label="lab_srt_MajorCustomersAxis_9C1D542BFA4CCD72495B75B59BB0BD15" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Customer [Axis] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MajorCustomersAxis" xlink:label="loc_srt_MajorCustomersAxis_9C1D542BFA4CCD72495B75B59BB0BD15" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_MajorCustomersAxis_9C1D542BFA4CCD72495B75B59BB0BD15" xlink:to="lab_srt_MajorCustomersAxis_9C1D542BFA4CCD72495B75B59BB0BD15" xlink:type="arc"/>

<link:label id="lab_srt_NameOfMajorCustomerDomain_0D54835403757054C53C75B59BB06E28_terseLabel_en-US" xlink:label="lab_srt_NameOfMajorCustomerDomain_0D54835403757054C53C75B59BB06E28" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Name of Major Customer [Domain] </link:label>

<link:label id="lab_srt_NameOfMajorCustomerDomain_0D54835403757054C53C75B59BB06E28_label_en-US" xlink:label="lab_srt_NameOfMajorCustomerDomain_0D54835403757054C53C75B59BB06E28" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Customer [Domain] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_NameOfMajorCustomerDomain" xlink:label="loc_srt_NameOfMajorCustomerDomain_0D54835403757054C53C75B59BB06E28" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_NameOfMajorCustomerDomain_0D54835403757054C53C75B59BB06E28" xlink:to="lab_srt_NameOfMajorCustomerDomain_0D54835403757054C53C75B59BB06E28" xlink:type="arc"/>

<link:label id="lab_core_MurphyUSAMember_1BA57D6C3397D0AE651175B59BB038AD_terseLabel_en-US" xlink:label="lab_core_MurphyUSAMember_1BA57D6C3397D0AE651175B59BB038AD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Murphy USA </link:label>

<link:label id="lab_core_MurphyUSAMember_1BA57D6C3397D0AE651175B59BB038AD_label_en-US" xlink:label="lab_core_MurphyUSAMember_1BA57D6C3397D0AE651175B59BB038AD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Murphy USA [Member] </link:label>

<link:label id="lab_core_MurphyUSAMember_1BA57D6C3397D0AE651175B59BB038AD_documentation_en-US" xlink:label="lab_core_MurphyUSAMember_1BA57D6C3397D0AE651175B59BB038AD" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Murphy USA [Member] </link:label>

<link:loc xlink:href="core-20191231.xsd#core_MurphyUSAMember" xlink:label="loc_core_MurphyUSAMember_1BA57D6C3397D0AE651175B59BB038AD" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_MurphyUSAMember_1BA57D6C3397D0AE651175B59BB038AD" xlink:to="lab_core_MurphyUSAMember_1BA57D6C3397D0AE651175B59BB038AD" xlink:type="arc"/>

<link:label id="lab_us-gaap_ConcentrationRiskByBenchmarkAxis_8F27A2D00EE6A5E4B49775B59BB0D083_terseLabel_en-US" xlink:label="lab_us-gaap_ConcentrationRiskByBenchmarkAxis_8F27A2D00EE6A5E4B49775B59BB0D083" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Concentration Risk Benchmark [Axis] </link:label>

<link:label id="lab_us-gaap_ConcentrationRiskByBenchmarkAxis_8F27A2D00EE6A5E4B49775B59BB0D083_label_en-US" xlink:label="lab_us-gaap_ConcentrationRiskByBenchmarkAxis_8F27A2D00EE6A5E4B49775B59BB0D083" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Concentration Risk Benchmark [Axis] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_8F27A2D00EE6A5E4B49775B59BB0D083" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_8F27A2D00EE6A5E4B49775B59BB0D083" xlink:to="lab_us-gaap_ConcentrationRiskByBenchmarkAxis_8F27A2D00EE6A5E4B49775B59BB0D083" xlink:type="arc"/>

<link:label id="lab_us-gaap_ConcentrationRiskBenchmarkDomain_64A12CFC46CD4317187C75B59BB19E5D_terseLabel_en-US" xlink:label="lab_us-gaap_ConcentrationRiskBenchmarkDomain_64A12CFC46CD4317187C75B59BB19E5D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Concentration Risk Benchmark [Domain] </link:label>

<link:label id="lab_us-gaap_ConcentrationRiskBenchmarkDomain_64A12CFC46CD4317187C75B59BB19E5D_label_en-US" xlink:label="lab_us-gaap_ConcentrationRiskBenchmarkDomain_64A12CFC46CD4317187C75B59BB19E5D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Concentration Risk Benchmark [Domain] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_64A12CFC46CD4317187C75B59BB19E5D" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_64A12CFC46CD4317187C75B59BB19E5D" xlink:to="lab_us-gaap_ConcentrationRiskBenchmarkDomain_64A12CFC46CD4317187C75B59BB19E5D" xlink:type="arc"/>

<link:label id="lab_us-gaap_RevenueFromContractWithCustomerMember_E6DB6128A005ECCC636C75B59BB19E2E_terseLabel_en-US" xlink:label="lab_us-gaap_RevenueFromContractWithCustomerMember_E6DB6128A005ECCC636C75B59BB19E2E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Net, sales </link:label>

<link:label id="lab_us-gaap_RevenueFromContractWithCustomerMember_E6DB6128A005ECCC636C75B59BB19E2E_label_en-US" xlink:label="lab_us-gaap_RevenueFromContractWithCustomerMember_E6DB6128A005ECCC636C75B59BB19E2E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Revenue from Contract with Customer Benchmark [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueFromContractWithCustomerMember" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerMember_E6DB6128A005ECCC636C75B59BB19E2E" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevenueFromContractWithCustomerMember_E6DB6128A005ECCC636C75B59BB19E2E" xlink:to="lab_us-gaap_RevenueFromContractWithCustomerMember_E6DB6128A005ECCC636C75B59BB19E2E" xlink:type="arc"/>

<link:label id="lab_core_ProductPurchasesMember_6D850DBCBAB870FA1F3F75B59BB12C43_terseLabel_en-US" xlink:label="lab_core_ProductPurchasesMember_6D850DBCBAB870FA1F3F75B59BB12C43" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Product purchase </link:label>

<link:label id="lab_core_ProductPurchasesMember_6D850DBCBAB870FA1F3F75B59BB12C43_label_en-US" xlink:label="lab_core_ProductPurchasesMember_6D850DBCBAB870FA1F3F75B59BB12C43" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Product Purchases [Member] </link:label>

<link:label id="lab_core_ProductPurchasesMember_6D850DBCBAB870FA1F3F75B59BB12C43_documentation_en-US" xlink:label="lab_core_ProductPurchasesMember_6D850DBCBAB870FA1F3F75B59BB12C43" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Product Purchases [Member] </link:label>

<link:loc xlink:href="core-20191231.xsd#core_ProductPurchasesMember" xlink:label="loc_core_ProductPurchasesMember_6D850DBCBAB870FA1F3F75B59BB12C43" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_ProductPurchasesMember_6D850DBCBAB870FA1F3F75B59BB12C43" xlink:to="lab_core_ProductPurchasesMember_6D850DBCBAB870FA1F3F75B59BB12C43" xlink:type="arc"/>

<link:label id="lab_core_GrossProfitMember_2A9576D09203C2A049A875B59BB1C421_terseLabel_en-US" xlink:label="lab_core_GrossProfitMember_2A9576D09203C2A049A875B59BB1C421" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Gross profit </link:label>

<link:label id="lab_core_GrossProfitMember_2A9576D09203C2A049A875B59BB1C421_label_en-US" xlink:label="lab_core_GrossProfitMember_2A9576D09203C2A049A875B59BB1C421" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Gross Profit [Member] </link:label>

<link:label id="lab_core_GrossProfitMember_2A9576D09203C2A049A875B59BB1C421_documentation_en-US" xlink:label="lab_core_GrossProfitMember_2A9576D09203C2A049A875B59BB1C421" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Gross Profit [Member] </link:label>

<link:loc xlink:href="core-20191231.xsd#core_GrossProfitMember" xlink:label="loc_core_GrossProfitMember_2A9576D09203C2A049A875B59BB1C421" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_GrossProfitMember_2A9576D09203C2A049A875B59BB1C421" xlink:to="lab_core_GrossProfitMember_2A9576D09203C2A049A875B59BB1C421" xlink:type="arc"/>

<link:label id="lab_core_MajorSuppliersAxis_28A4726CA6BBB6A90DD275B59BB150C2_terseLabel_en-US" xlink:label="lab_core_MajorSuppliersAxis_28A4726CA6BBB6A90DD275B59BB150C2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Major Suppliers [Axis] </link:label>

<link:label id="lab_core_MajorSuppliersAxis_28A4726CA6BBB6A90DD275B59BB150C2_label_en-US" xlink:label="lab_core_MajorSuppliersAxis_28A4726CA6BBB6A90DD275B59BB150C2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Major Suppliers [Axis] </link:label>

<link:label id="lab_core_MajorSuppliersAxis_28A4726CA6BBB6A90DD275B59BB150C2_documentation_en-US" xlink:label="lab_core_MajorSuppliersAxis_28A4726CA6BBB6A90DD275B59BB150C2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Major Suppliers [Axis] </link:label>

<link:loc xlink:href="core-20191231.xsd#core_MajorSuppliersAxis" xlink:label="loc_core_MajorSuppliersAxis_28A4726CA6BBB6A90DD275B59BB150C2" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_MajorSuppliersAxis_28A4726CA6BBB6A90DD275B59BB150C2" xlink:to="lab_core_MajorSuppliersAxis_28A4726CA6BBB6A90DD275B59BB150C2" xlink:type="arc"/>

<link:label id="lab_core_MajorSuppliersDomain_99E9F3BEA8EDEF4C0C8475B59BB2003C_terseLabel_en-US" xlink:label="lab_core_MajorSuppliersDomain_99E9F3BEA8EDEF4C0C8475B59BB2003C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Major Suppliers [Domain] </link:label>

<link:label id="lab_core_MajorSuppliersDomain_99E9F3BEA8EDEF4C0C8475B59BB2003C_label_en-US" xlink:label="lab_core_MajorSuppliersDomain_99E9F3BEA8EDEF4C0C8475B59BB2003C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Major Suppliers [Domain] </link:label>

<link:label id="lab_core_MajorSuppliersDomain_99E9F3BEA8EDEF4C0C8475B59BB2003C_documentation_en-US" xlink:label="lab_core_MajorSuppliersDomain_99E9F3BEA8EDEF4C0C8475B59BB2003C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> [Domain] for Major Suppliers [Axis] </link:label>

<link:loc xlink:href="core-20191231.xsd#core_MajorSuppliersDomain" xlink:label="loc_core_MajorSuppliersDomain_99E9F3BEA8EDEF4C0C8475B59BB2003C" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_MajorSuppliersDomain_99E9F3BEA8EDEF4C0C8475B59BB2003C" xlink:to="lab_core_MajorSuppliersDomain_99E9F3BEA8EDEF4C0C8475B59BB2003C" xlink:type="arc"/>

<link:label id="lab_core_AltriaGroupInc.Member_97B4F931DBB200F4048B75B59BB235E4_terseLabel_en-US" xlink:label="lab_core_AltriaGroupInc.Member_97B4F931DBB200F4048B75B59BB235E4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Altria Group, Inc. </link:label>

<link:label id="lab_core_AltriaGroupInc.Member_97B4F931DBB200F4048B75B59BB235E4_label_en-US" xlink:label="lab_core_AltriaGroupInc.Member_97B4F931DBB200F4048B75B59BB235E4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Altria Group, Inc. [Member] </link:label>

<link:label id="lab_core_AltriaGroupInc.Member_97B4F931DBB200F4048B75B59BB235E4_documentation_en-US" xlink:label="lab_core_AltriaGroupInc.Member_97B4F931DBB200F4048B75B59BB235E4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Altria Group, Inc. [Member] </link:label>

<link:loc xlink:href="core-20191231.xsd#core_AltriaGroupInc.Member" xlink:label="loc_core_AltriaGroupInc.Member_97B4F931DBB200F4048B75B59BB235E4" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_AltriaGroupInc.Member_97B4F931DBB200F4048B75B59BB235E4" xlink:to="lab_core_AltriaGroupInc.Member_97B4F931DBB200F4048B75B59BB235E4" xlink:type="arc"/>

<link:label id="lab_core_RJReynoldsTobaccoCompanyMember_B96D3AB23A298176B8E675B59BB2E019_terseLabel_en-US" xlink:label="lab_core_RJReynoldsTobaccoCompanyMember_B96D3AB23A298176B8E675B59BB2E019" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> R.J. Reynolds Tobacco Company </link:label>

<link:label id="lab_core_RJReynoldsTobaccoCompanyMember_B96D3AB23A298176B8E675B59BB2E019_label_en-US" xlink:label="lab_core_RJReynoldsTobaccoCompanyMember_B96D3AB23A298176B8E675B59BB2E019" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> R.J. Reynolds Tobacco Company [Member] </link:label>

<link:label id="lab_core_RJReynoldsTobaccoCompanyMember_B96D3AB23A298176B8E675B59BB2E019_documentation_en-US" xlink:label="lab_core_RJReynoldsTobaccoCompanyMember_B96D3AB23A298176B8E675B59BB2E019" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> R.J. Reynolds Tobacco Company [Member] </link:label>

<link:loc xlink:href="core-20191231.xsd#core_RJReynoldsTobaccoCompanyMember" xlink:label="loc_core_RJReynoldsTobaccoCompanyMember_B96D3AB23A298176B8E675B59BB2E019" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_RJReynoldsTobaccoCompanyMember_B96D3AB23A298176B8E675B59BB2E019" xlink:to="lab_core_RJReynoldsTobaccoCompanyMember_B96D3AB23A298176B8E675B59BB2E019" xlink:type="arc"/>

<link:label id="lab_us-gaap_ConcentrationRiskByTypeAxis_05204F35CB36863E081F75B59BB33542_terseLabel_en-US" xlink:label="lab_us-gaap_ConcentrationRiskByTypeAxis_05204F35CB36863E081F75B59BB33542" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Concentration Risk Type [Axis] </link:label>

<link:label id="lab_us-gaap_ConcentrationRiskByTypeAxis_05204F35CB36863E081F75B59BB33542_label_en-US" xlink:label="lab_us-gaap_ConcentrationRiskByTypeAxis_05204F35CB36863E081F75B59BB33542" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Concentration Risk Type [Axis] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskByTypeAxis" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_05204F35CB36863E081F75B59BB33542" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_05204F35CB36863E081F75B59BB33542" xlink:to="lab_us-gaap_ConcentrationRiskByTypeAxis_05204F35CB36863E081F75B59BB33542" xlink:type="arc"/>

<link:label id="lab_us-gaap_ConcentrationRiskTypeDomain_82AEB993B29C17C003E375B59BB3E12A_terseLabel_en-US" xlink:label="lab_us-gaap_ConcentrationRiskTypeDomain_82AEB993B29C17C003E375B59BB3E12A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Concentration Risk Type [Domain] </link:label>

<link:label id="lab_us-gaap_ConcentrationRiskTypeDomain_82AEB993B29C17C003E375B59BB3E12A_label_en-US" xlink:label="lab_us-gaap_ConcentrationRiskTypeDomain_82AEB993B29C17C003E375B59BB3E12A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Concentration Risk Type [Domain] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskTypeDomain" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_82AEB993B29C17C003E375B59BB3E12A" xlink:type="locator"/>

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<link:label id="lab_us-gaap_CustomerConcentrationRiskMember_D2DA22C629B7167286B675B59BB363BF_terseLabel_en-US" xlink:label="lab_us-gaap_CustomerConcentrationRiskMember_D2DA22C629B7167286B675B59BB363BF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Customer Concentration Risk </link:label>

<link:label id="lab_us-gaap_CustomerConcentrationRiskMember_D2DA22C629B7167286B675B59BB363BF_label_en-US" xlink:label="lab_us-gaap_CustomerConcentrationRiskMember_D2DA22C629B7167286B675B59BB363BF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Customer Concentration Risk [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CustomerConcentrationRiskMember" xlink:label="loc_us-gaap_CustomerConcentrationRiskMember_D2DA22C629B7167286B675B59BB363BF" xlink:type="locator"/>

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<link:label id="lab_us-gaap_SupplierConcentrationRiskMember_84838583FE2F044C6C8C75B59BB405F2_terseLabel_en-US" xlink:label="lab_us-gaap_SupplierConcentrationRiskMember_84838583FE2F044C6C8C75B59BB405F2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Supplier Concentration Risk </link:label>

<link:label id="lab_us-gaap_SupplierConcentrationRiskMember_84838583FE2F044C6C8C75B59BB405F2_label_en-US" xlink:label="lab_us-gaap_SupplierConcentrationRiskMember_84838583FE2F044C6C8C75B59BB405F2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Supplier Concentration Risk [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SupplierConcentrationRiskMember" xlink:label="loc_us-gaap_SupplierConcentrationRiskMember_84838583FE2F044C6C8C75B59BB405F2" xlink:type="locator"/>

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<link:label id="lab_us-gaap_ProductConcentrationRiskMember_810DB1B319702DEE6CAB75B59BB4D8A7_terseLabel_en-US" xlink:label="lab_us-gaap_ProductConcentrationRiskMember_810DB1B319702DEE6CAB75B59BB4D8A7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Product Concentration Risk </link:label>

<link:label id="lab_us-gaap_ProductConcentrationRiskMember_810DB1B319702DEE6CAB75B59BB4D8A7_label_en-US" xlink:label="lab_us-gaap_ProductConcentrationRiskMember_810DB1B319702DEE6CAB75B59BB4D8A7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Product Concentration Risk [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProductConcentrationRiskMember" xlink:label="loc_us-gaap_ProductConcentrationRiskMember_810DB1B319702DEE6CAB75B59BB4D8A7" xlink:type="locator"/>

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<link:label id="lab_core_SelfInsurancePreClaimLimitAmount_81CDA8FFA4ADC51B2B7E75B59BB4E55C_terseLabel_en-US" xlink:label="lab_core_SelfInsurancePreClaimLimitAmount_81CDA8FFA4ADC51B2B7E75B59BB4E55C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Self-insurance pre-claim limit, amount </link:label>

<link:label id="lab_core_SelfInsurancePreClaimLimitAmount_81CDA8FFA4ADC51B2B7E75B59BB4E55C_label_en-US" xlink:label="lab_core_SelfInsurancePreClaimLimitAmount_81CDA8FFA4ADC51B2B7E75B59BB4E55C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Self-insurance Pre-claim Limit, Amount </link:label>

<link:label id="lab_core_SelfInsurancePreClaimLimitAmount_81CDA8FFA4ADC51B2B7E75B59BB4E55C_documentation_en-US" xlink:label="lab_core_SelfInsurancePreClaimLimitAmount_81CDA8FFA4ADC51B2B7E75B59BB4E55C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Self-insurance Pre-claim Limit, Amount </link:label>

<link:loc xlink:href="core-20191231.xsd#core_SelfInsurancePreClaimLimitAmount" xlink:label="loc_core_SelfInsurancePreClaimLimitAmount_81CDA8FFA4ADC51B2B7E75B59BB4E55C" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_SelfInsurancePreClaimLimitAmount_81CDA8FFA4ADC51B2B7E75B59BB4E55C" xlink:to="lab_core_SelfInsurancePreClaimLimitAmount_81CDA8FFA4ADC51B2B7E75B59BB4E55C" xlink:type="arc"/>

<link:label id="lab_core_LiabilityForClaimsAndClaimsAdjustmentExpenseLongTerm_98A3AB68EFC7B01BD68F75B59BB49257_verboseLabel_en-US" xlink:label="lab_core_LiabilityForClaimsAndClaimsAdjustmentExpenseLongTerm_98A3AB68EFC7B01BD68F75B59BB49257" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Self insurance gross obligation, long-term </link:label>

<link:loc xlink:href="core-20191231.xsd#core_LiabilityForClaimsAndClaimsAdjustmentExpenseLongTerm" xlink:label="loc_core_LiabilityForClaimsAndClaimsAdjustmentExpenseLongTerm_98A3AB68EFC7B01BD68F75B59BB49257" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_LiabilityForClaimsAndClaimsAdjustmentExpenseLongTerm_98A3AB68EFC7B01BD68F75B59BB49257" xlink:to="lab_core_LiabilityForClaimsAndClaimsAdjustmentExpenseLongTerm_98A3AB68EFC7B01BD68F75B59BB49257" xlink:type="arc"/>

<link:label id="lab_core_LiabilityForClaimsAndClaimsAdjustmentExpenseShortTerm_BA43406C4578738CDEA475B59BB55D68_terseLabel_en-US" xlink:label="lab_core_LiabilityForClaimsAndClaimsAdjustmentExpenseShortTerm_BA43406C4578738CDEA475B59BB55D68" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Self insurance gross obligation, short-term </link:label>

<link:loc xlink:href="core-20191231.xsd#core_LiabilityForClaimsAndClaimsAdjustmentExpenseShortTerm" xlink:label="loc_core_LiabilityForClaimsAndClaimsAdjustmentExpenseShortTerm_BA43406C4578738CDEA475B59BB55D68" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_LiabilityForClaimsAndClaimsAdjustmentExpenseShortTerm_BA43406C4578738CDEA475B59BB55D68" xlink:to="lab_core_LiabilityForClaimsAndClaimsAdjustmentExpenseShortTerm_BA43406C4578738CDEA475B59BB55D68" xlink:type="arc"/>

<link:label id="lab_us-gaap_SelfInsuranceReserveNoncurrent_AC3E3082DCEB8C4A59E275B59BB5A4F1_terseLabel_en-US" xlink:label="lab_us-gaap_SelfInsuranceReserveNoncurrent_AC3E3082DCEB8C4A59E275B59BB5A4F1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Self insurance liabilities net of insurance recoverables, long-term </link:label>

<link:label id="lab_us-gaap_SelfInsuranceReserveNoncurrent_AC3E3082DCEB8C4A59E275B59BB5A4F1_label_en-US" xlink:label="lab_us-gaap_SelfInsuranceReserveNoncurrent_AC3E3082DCEB8C4A59E275B59BB5A4F1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Self Insurance Reserve, Noncurrent </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SelfInsuranceReserveNoncurrent" xlink:label="loc_us-gaap_SelfInsuranceReserveNoncurrent_AC3E3082DCEB8C4A59E275B59BB5A4F1" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SelfInsuranceReserveNoncurrent_AC3E3082DCEB8C4A59E275B59BB5A4F1" xlink:to="lab_us-gaap_SelfInsuranceReserveNoncurrent_AC3E3082DCEB8C4A59E275B59BB5A4F1" xlink:type="arc"/>

<link:label id="lab_us-gaap_SelfInsuranceReserveCurrent_AB1A0352E5B3E28DBC3775B59BB5F7B7_terseLabel_en-US" xlink:label="lab_us-gaap_SelfInsuranceReserveCurrent_AB1A0352E5B3E28DBC3775B59BB5F7B7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Self insurance liabilities net of insurance recoverables, short-term </link:label>

<link:label id="lab_us-gaap_SelfInsuranceReserveCurrent_AB1A0352E5B3E28DBC3775B59BB5F7B7_label_en-US" xlink:label="lab_us-gaap_SelfInsuranceReserveCurrent_AB1A0352E5B3E28DBC3775B59BB5F7B7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Self Insurance Reserve, Current </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SelfInsuranceReserveCurrent" xlink:label="loc_us-gaap_SelfInsuranceReserveCurrent_AB1A0352E5B3E28DBC3775B59BB5F7B7" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SelfInsuranceReserveCurrent_AB1A0352E5B3E28DBC3775B59BB5F7B7" xlink:to="lab_us-gaap_SelfInsuranceReserveCurrent_AB1A0352E5B3E28DBC3775B59BB5F7B7" xlink:type="arc"/>

<link:label id="lab_us-gaap_ConcentrationRiskPercentage1_0EF02551E4FB1EC4E87275B59BB5DBEB_terseLabel_en-US" xlink:label="lab_us-gaap_ConcentrationRiskPercentage1_0EF02551E4FB1EC4E87275B59BB5DBEB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Concentration risk, percentage </link:label>

<link:label id="lab_us-gaap_ConcentrationRiskPercentage1_0EF02551E4FB1EC4E87275B59BB5DBEB_label_en-US" xlink:label="lab_us-gaap_ConcentrationRiskPercentage1_0EF02551E4FB1EC4E87275B59BB5DBEB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Concentration Risk, Percentage </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskPercentage1" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_0EF02551E4FB1EC4E87275B59BB5DBEB" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ConcentrationRiskPercentage1_0EF02551E4FB1EC4E87275B59BB5DBEB" xlink:to="lab_us-gaap_ConcentrationRiskPercentage1_0EF02551E4FB1EC4E87275B59BB5DBEB" xlink:type="arc"/>

<link:label id="lab_us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_0BF53841D9397A71BBF675B59B1FCD69_terseLabel_en-US" xlink:label="lab_us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_0BF53841D9397A71BBF675B59B1FCD69" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Goodwill and Other Intangible Assets, Net </link:label>

<link:label id="lab_us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_0BF53841D9397A71BBF675B59B1FCD69_label_en-US" xlink:label="lab_us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_0BF53841D9397A71BBF675B59B1FCD69" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Goodwill and Intangible Assets Disclosure [Text Block] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_0BF53841D9397A71BBF675B59B1FCD69" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_0BF53841D9397A71BBF675B59B1FCD69" xlink:to="lab_us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_0BF53841D9397A71BBF675B59B1FCD69" xlink:type="arc"/>

<link:label id="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_A8D51A32FFA210B1E37875B59B934584_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_A8D51A32FFA210B1E37875B59B934584" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accounts receivable </link:label>

<link:label id="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_A8D51A32FFA210B1E37875B59B934584_label_en-US" xlink:label="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_A8D51A32FFA210B1E37875B59B934584" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_A8D51A32FFA210B1E37875B59B934584" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_A8D51A32FFA210B1E37875B59B934584" xlink:to="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_A8D51A32FFA210B1E37875B59B934584" xlink:type="arc"/>

<link:label id="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_6ABFDCD64FBB89B8BDD075B59B943EBE_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_6ABFDCD64FBB89B8BDD075B59B943EBE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Inventories </link:label>

<link:label id="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_6ABFDCD64FBB89B8BDD075B59B943EBE_label_en-US" xlink:label="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_6ABFDCD64FBB89B8BDD075B59B943EBE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_6ABFDCD64FBB89B8BDD075B59B943EBE" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_6ABFDCD64FBB89B8BDD075B59B943EBE" xlink:to="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_6ABFDCD64FBB89B8BDD075B59B943EBE" xlink:type="arc"/>

<link:label id="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets_88D566FBB52863AA592B75B59B946F94_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets_88D566FBB52863AA592B75B59B946F94" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Deposits and prepayments </link:label>

<link:label id="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets_88D566FBB52863AA592B75B59B946F94_label_en-US" xlink:label="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets_88D566FBB52863AA592B75B59B946F94" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets_88D566FBB52863AA592B75B59B946F94" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets_88D566FBB52863AA592B75B59B946F94" xlink:to="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets_88D566FBB52863AA592B75B59B946F94" xlink:type="arc"/>

<link:label id="lab_core_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentAssetsReceivablesOther_BBE968789808E36C4AB975B59B946F4F_terseLabel_en-US" xlink:label="lab_core_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentAssetsReceivablesOther_BBE968789808E36C4AB975B59B946F4F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other receivables </link:label>

<link:label id="lab_core_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentAssetsReceivablesOther_BBE968789808E36C4AB975B59B946F4F_label_en-US" xlink:label="lab_core_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentAssetsReceivablesOther_BBE968789808E36C4AB975B59B946F4F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables, Other </link:label>

<link:label id="lab_core_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentAssetsReceivablesOther_BBE968789808E36C4AB975B59B946F4F_documentation_en-US" xlink:label="lab_core_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentAssetsReceivablesOther_BBE968789808E36C4AB975B59B946F4F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables, Other </link:label>

<link:loc xlink:href="core-20191231.xsd#core_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentAssetsReceivablesOther" xlink:label="loc_core_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentAssetsReceivablesOther_BBE968789808E36C4AB975B59B946F4F" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentAssetsReceivablesOther_BBE968789808E36C4AB975B59B946F4F" xlink:to="lab_core_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentAssetsReceivablesOther_BBE968789808E36C4AB975B59B946F4F" xlink:type="arc"/>

<link:label id="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_1B0DDA4AB3B79E32739F75B59B94557D_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_1B0DDA4AB3B79E32739F75B59B94557D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Property and equipment </link:label>

<link:label id="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_1B0DDA4AB3B79E32739F75B59B94557D_label_en-US" xlink:label="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_1B0DDA4AB3B79E32739F75B59B94557D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_1B0DDA4AB3B79E32739F75B59B94557D" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_1B0DDA4AB3B79E32739F75B59B94557D" xlink:to="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_1B0DDA4AB3B79E32739F75B59B94557D" xlink:type="arc"/>

<link:label id="lab_us-gaap_Goodwill_F6F8401F8F8E8794C3AF75B59B94FDA5_verboseLabel_en-US" xlink:label="lab_us-gaap_Goodwill_F6F8401F8F8E8794C3AF75B59B94FDA5" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Goodwill (tax deductible) </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_F6F8401F8F8E8794C3AF75B59B94FDA5" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Goodwill_F6F8401F8F8E8794C3AF75B59B94FDA5" xlink:to="lab_us-gaap_Goodwill_F6F8401F8F8E8794C3AF75B59B94FDA5" xlink:type="arc"/>

<link:label id="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCapitalLeaseObligation_CDB9D0FCAC90E2B59E3575B59B959180_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCapitalLeaseObligation_CDB9D0FCAC90E2B59E3575B59B959180" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Less: Capital lease liability </link:label>

<link:label id="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCapitalLeaseObligation_CDB9D0FCAC90E2B59E3575B59B959180_label_en-US" xlink:label="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCapitalLeaseObligation_CDB9D0FCAC90E2B59E3575B59B959180" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Business Combination, Recognized Identifiable Asset Acquired and Liability Assumed, Lease Obligation </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCapitalLeaseObligation" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCapitalLeaseObligation_CDB9D0FCAC90E2B59E3575B59B959180" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCapitalLeaseObligation_CDB9D0FCAC90E2B59E3575B59B959180" xlink:to="lab_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCapitalLeaseObligation_CDB9D0FCAC90E2B59E3575B59B959180" xlink:type="arc"/>

<link:label id="lab_core_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedLiabilities_E75F49F5E54E95D7AFDF75B59B95B9F4_negatedTerseLabel_en-US" xlink:label="lab_core_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedLiabilities_E75F49F5E54E95D7AFDF75B59B95B9F4" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Less: Accrued liabilities </link:label>

<link:label id="lab_core_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedLiabilities_E75F49F5E54E95D7AFDF75B59B95B9F4_label_en-US" xlink:label="lab_core_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedLiabilities_E75F49F5E54E95D7AFDF75B59B95B9F4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Accrued Liabilities </link:label>

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<link:label id="lab_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardTotalOptionsAndNonOptionsEquityInstrumentsExpectedToVestOutstandingAggregateIntrinsicValue_C0F4041E591DB142BA597B27080E6D95_label_en-US" xlink:label="lab_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardTotalOptionsAndNonOptionsEquityInstrumentsExpectedToVestOutstandingAggregateIntrinsicValue_C0F4041E591DB142BA597B27080E6D95" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Total Options and Non-Options Equity Instruments, Expected to Vest, Outstanding, Aggregate Intrinsic Value </link:label>

<link:label id="lab_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardTotalOptionsAndNonOptionsEquityInstrumentsExpectedToVestOutstandingAggregateIntrinsicValue_C0F4041E591DB142BA597B27080E6D95_documentation_en-US" xlink:label="lab_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardTotalOptionsAndNonOptionsEquityInstrumentsExpectedToVestOutstandingAggregateIntrinsicValue_C0F4041E591DB142BA597B27080E6D95" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Total Options and Non-Options Equity Instruments, Expected to Vest, Outstanding, Aggregate Intrinsic Value </link:label>

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<link:label id="lab_us-gaap_SaleOfStockPricePerShare_F1B1D1791AC6AC99A7567B27080E0C50_terseLabel_en-US" xlink:label="lab_us-gaap_SaleOfStockPricePerShare_F1B1D1791AC6AC99A7567B27080E0C50" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Common stock, price per share (in dollars per share) </link:label>

<link:label id="lab_us-gaap_SaleOfStockPricePerShare_F1B1D1791AC6AC99A7567B27080E0C50_label_en-US" xlink:label="lab_us-gaap_SaleOfStockPricePerShare_F1B1D1791AC6AC99A7567B27080E0C50" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Sale of Stock, Price Per Share </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SaleOfStockPricePerShare" xlink:label="loc_us-gaap_SaleOfStockPricePerShare_F1B1D1791AC6AC99A7567B27080E0C50" xlink:type="locator"/>

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<link:label id="lab_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_AF2D1451C9896F801A0975B59AA5A0CF_terseLabel_en-US" xlink:label="lab_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_AF2D1451C9896F801A0975B59AA5A0CF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Stock Incentive Plans </link:label>

<link:label id="lab_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_AF2D1451C9896F801A0975B59AA5A0CF_label_en-US" xlink:label="lab_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_AF2D1451C9896F801A0975B59AA5A0CF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Payment Arrangement [Text Block] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_AF2D1451C9896F801A0975B59AA5A0CF" xlink:type="locator"/>

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<link:label id="lab_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_F997B10FFDAD0567290875B59C100FFE_label_en-US" xlink:label="lab_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_F997B10FFDAD0567290875B59C100FFE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Statement of Comprehensive Income [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract" xlink:label="loc_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_F997B10FFDAD0567290875B59C100FFE" xlink:type="locator"/>

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<link:label id="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_C9A3462EBD2F1C06C85A75B59C11C9EA_terseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_C9A3462EBD2F1C06C85A75B59C11C9EA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other comprehensive (loss) income, net of tax: </link:label>

<link:label id="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_C9A3462EBD2F1C06C85A75B59C11C9EA_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_C9A3462EBD2F1C06C85A75B59C11C9EA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Comprehensive Income (Loss), Net of Tax [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_C9A3462EBD2F1C06C85A75B59C11C9EA" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_C9A3462EBD2F1C06C85A75B59C11C9EA" xlink:to="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_C9A3462EBD2F1C06C85A75B59C11C9EA" xlink:type="arc"/>

<link:label id="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent_DF72401FB6733B5EE17D75B59C11EE89_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent_DF72401FB6733B5EE17D75B59C11EE89" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Defined benefit plan adjustments (Note 16) </link:label>

<link:label id="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent_DF72401FB6733B5EE17D75B59C11EE89_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent_DF72401FB6733B5EE17D75B59C11EE89" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent" xlink:label="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent_DF72401FB6733B5EE17D75B59C11EE89" xlink:type="locator"/>

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<link:label id="lab_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_679454BEBC4468C7891475B59C1179C3_terseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_679454BEBC4468C7891475B59C1179C3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Foreign currency translation gain (loss), net (Note 16) </link:label>

<link:label id="lab_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_679454BEBC4468C7891475B59C1179C3_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_679454BEBC4468C7891475B59C1179C3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_679454BEBC4468C7891475B59C1179C3" xlink:type="locator"/>

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<link:label id="lab_us-gaap_ComprehensiveIncomeNetOfTax_48203A5BA603EAA37A2175B59C11F56E_totalLabel_en-US" xlink:label="lab_us-gaap_ComprehensiveIncomeNetOfTax_48203A5BA603EAA37A2175B59C11F56E" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Comprehensive income </link:label>

<link:label id="lab_us-gaap_ComprehensiveIncomeNetOfTax_48203A5BA603EAA37A2175B59C11F56E_label_en-US" xlink:label="lab_us-gaap_ComprehensiveIncomeNetOfTax_48203A5BA603EAA37A2175B59C11F56E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Comprehensive Income (Loss), Net of Tax, Attributable to Parent </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_48203A5BA603EAA37A2175B59C11F56E" xlink:type="locator"/>

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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_D072A82D41E9E78A0DA57B2AE0A16D5B_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_D072A82D41E9E78A0DA57B2AE0A16D5B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Number of shares authorized (in shares) </link:label>

<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_D072A82D41E9E78A0DA57B2AE0A16D5B_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_D072A82D41E9E78A0DA57B2AE0A16D5B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_D072A82D41E9E78A0DA57B2AE0A16D5B" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_D072A82D41E9E78A0DA57B2AE0A16D5B" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_D072A82D41E9E78A0DA57B2AE0A16D5B" xlink:type="arc"/>

<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_5B41FF5F0C9DA12037B67B2AE0A2BFB9_verboseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_5B41FF5F0C9DA12037B67B2AE0A2BFB9" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Shares available for issuance (in shares) </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_5B41FF5F0C9DA12037B67B2AE0A2BFB9" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_5B41FF5F0C9DA12037B67B2AE0A2BFB9" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_5B41FF5F0C9DA12037B67B2AE0A2BFB9" xlink:type="arc"/>

<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_A7129CD7424FA7F9ADFD7B2AE0A2600E_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_A7129CD7424FA7F9ADFD7B2AE0A2600E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Award vesting period </link:label>

<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_A7129CD7424FA7F9ADFD7B2AE0A2600E_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_A7129CD7424FA7F9ADFD7B2AE0A2600E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_A7129CD7424FA7F9ADFD7B2AE0A2600E" xlink:type="locator"/>

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<link:label id="lab_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardCliffVestPercentage_98A6145973AF874FE9687B2AE0A24ABC_terseLabel_en-US" xlink:label="lab_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardCliffVestPercentage_98A6145973AF874FE9687B2AE0A24ABC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Shares cliff vest percentage </link:label>

<link:label id="lab_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardCliffVestPercentage_98A6145973AF874FE9687B2AE0A24ABC_label_en-US" xlink:label="lab_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardCliffVestPercentage_98A6145973AF874FE9687B2AE0A24ABC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Cliff Vest Percentage </link:label>

<link:label id="lab_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardCliffVestPercentage_98A6145973AF874FE9687B2AE0A24ABC_documentation_en-US" xlink:label="lab_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardCliffVestPercentage_98A6145973AF874FE9687B2AE0A24ABC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Cliff Vest Percentage </link:label>

<link:loc xlink:href="core-20191231.xsd#core_ShareBasedCompensationArrangementByShareBasedPaymentAwardCliffVestPercentage" xlink:label="loc_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardCliffVestPercentage_98A6145973AF874FE9687B2AE0A24ABC" xlink:type="locator"/>

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<link:label id="lab_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardRemainingPeriodFollowingFirstVestingCommencementDate_173BFDE0AE32495DA4297B2AE0A2AE5A_terseLabel_en-US" xlink:label="lab_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardRemainingPeriodFollowingFirstVestingCommencementDate_173BFDE0AE32495DA4297B2AE0A2AE5A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Remaining period following first vesting commencement date </link:label>

<link:label id="lab_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardRemainingPeriodFollowingFirstVestingCommencementDate_173BFDE0AE32495DA4297B2AE0A2AE5A_label_en-US" xlink:label="lab_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardRemainingPeriodFollowingFirstVestingCommencementDate_173BFDE0AE32495DA4297B2AE0A2AE5A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Remaining Period Following First Vesting Commencement Date </link:label>

<link:label id="lab_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardRemainingPeriodFollowingFirstVestingCommencementDate_173BFDE0AE32495DA4297B2AE0A2AE5A_documentation_en-US" xlink:label="lab_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardRemainingPeriodFollowingFirstVestingCommencementDate_173BFDE0AE32495DA4297B2AE0A2AE5A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Remaining Period Following First Vesting Commencement Date </link:label>

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<link:label id="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_DB562A7CC3551641381B7B2AE0A25773_label_en-US" xlink:label="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_DB562A7CC3551641381B7B2AE0A25773" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount </link:label>

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<link:label id="lab_srt_ScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock_A3E8112DE4105087E08D75B59A1779EC_terseLabel_en-US" xlink:label="lab_srt_ScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock_A3E8112DE4105087E08D75B59A1779EC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule II - Valuation and Qualifying Accounts </link:label>

<link:label id="lab_srt_ScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock_A3E8112DE4105087E08D75B59A1779EC_label_en-US" xlink:label="lab_srt_ScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock_A3E8112DE4105087E08D75B59A1779EC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock" xlink:label="loc_srt_ScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock_A3E8112DE4105087E08D75B59A1779EC" xlink:type="locator"/>

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<link:label id="lab_us-gaap_ScheduleOfQuarterlyFinancialInformationTableTextBlock_09BCC73F7E5050C31F6875B59A291046_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfQuarterlyFinancialInformationTableTextBlock_09BCC73F7E5050C31F6875B59A291046" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Quarterly Financial Information </link:label>

<link:label id="lab_us-gaap_ScheduleOfQuarterlyFinancialInformationTableTextBlock_09BCC73F7E5050C31F6875B59A291046_label_en-US" xlink:label="lab_us-gaap_ScheduleOfQuarterlyFinancialInformationTableTextBlock_09BCC73F7E5050C31F6875B59A291046" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Quarterly Financial Information [Table Text Block] </link:label>

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<link:label id="lab_us-gaap_Goodwill_DB6FA6C1FE33E443428675B59B19A298_netLabel_en-US" xlink:label="lab_us-gaap_Goodwill_DB6FA6C1FE33E443428675B59B19A298" xlink:role="http://www.xbrl.org/2009/role/netLabel" xlink:type="resource" xml:lang="en-US"> Goodwill </link:label>

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<link:label id="lab_us-gaap_GoodwillImpairmentLoss_B105EB27A7775307CE8275B59B1AB9BC_terseLabel_en-US" xlink:label="lab_us-gaap_GoodwillImpairmentLoss_B105EB27A7775307CE8275B59B1AB9BC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Goodwill impairment </link:label>

<link:label id="lab_us-gaap_GoodwillImpairmentLoss_B105EB27A7775307CE8275B59B1AB9BC_label_en-US" xlink:label="lab_us-gaap_GoodwillImpairmentLoss_B105EB27A7775307CE8275B59B1AB9BC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Goodwill, Impairment Loss </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillImpairmentLoss" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_B105EB27A7775307CE8275B59B1AB9BC" xlink:type="locator"/>

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<link:label id="lab_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_B8F41E55241D024BF06275B59B1A1D5C_terseLabel_en-US" xlink:label="lab_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_B8F41E55241D024BF06275B59B1A1D5C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accumulated impairment loss </link:label>

<link:label id="lab_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_B8F41E55241D024BF06275B59B1A1D5C_label_en-US" xlink:label="lab_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_B8F41E55241D024BF06275B59B1A1D5C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Goodwill, Impaired, Accumulated Impairment Loss </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillImpairedAccumulatedImpairmentLoss" xlink:label="loc_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_B8F41E55241D024BF06275B59B1A1D5C" xlink:type="locator"/>

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<link:label id="lab_core_FiniteLivedIntangibleAssetsAssetBookValueAndAccumulatedAmortizationAdjustments_1F3069A7052AFC158B4D75B59B1A45B9_terseLabel_en-US" xlink:label="lab_core_FiniteLivedIntangibleAssetsAssetBookValueAndAccumulatedAmortizationAdjustments_1F3069A7052AFC158B4D75B59B1A45B9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Reduction of the cost and associated accumulated amortization for fully amortized software </link:label>

<link:label id="lab_core_FiniteLivedIntangibleAssetsAssetBookValueAndAccumulatedAmortizationAdjustments_1F3069A7052AFC158B4D75B59B1A45B9_label_en-US" xlink:label="lab_core_FiniteLivedIntangibleAssetsAssetBookValueAndAccumulatedAmortizationAdjustments_1F3069A7052AFC158B4D75B59B1A45B9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finite-Lived Intangible Assets, Asset Book Value And Accumulated Amortization Adjustments </link:label>

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<link:label id="lab_us-gaap_BankOverdrafts_35EAAB4F7464FED15D3A75B59BCB6B99_verboseLabel_en-US" xlink:label="lab_us-gaap_BankOverdrafts_35EAAB4F7464FED15D3A75B59BCB6B99" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Bank overdrafts </link:label>

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<link:label id="lab_us-gaap_StatementOfStockholdersEquityAbstract_A51AED28D1C2A5B65B9A99C2EA12BBFE_label_en-US" xlink:label="lab_us-gaap_StatementOfStockholdersEquityAbstract_A51AED28D1C2A5B65B9A99C2EA12BBFE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Statement of Stockholders' Equity [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementOfStockholdersEquityAbstract" xlink:label="loc_us-gaap_StatementOfStockholdersEquityAbstract_A51AED28D1C2A5B65B9A99C2EA12BBFE" xlink:type="locator"/>

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<link:label id="lab_us-gaap_StatementTable_1CDA860C7E8BA82846CB99C2EA12D4E9_terseLabel_en-US" xlink:label="lab_us-gaap_StatementTable_1CDA860C7E8BA82846CB99C2EA12D4E9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Statement [Table] </link:label>

<link:label id="lab_us-gaap_StatementTable_1CDA860C7E8BA82846CB99C2EA12D4E9_label_en-US" xlink:label="lab_us-gaap_StatementTable_1CDA860C7E8BA82846CB99C2EA12D4E9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Statement [Table] </link:label>

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<link:label id="lab_us-gaap_CommonStockMember_4B42238A90971D07222A99C2EA14B790_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockMember_4B42238A90971D07222A99C2EA14B790" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Common stock </link:label>

<link:label id="lab_us-gaap_CommonStockMember_4B42238A90971D07222A99C2EA14B790_label_en-US" xlink:label="lab_us-gaap_CommonStockMember_4B42238A90971D07222A99C2EA14B790" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Common Stock [Member] </link:label>

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<link:label id="lab_us-gaap_AdditionalPaidInCapitalMember_111B78B9258ABE015F9F99C2EA1423FF_terseLabel_en-US" xlink:label="lab_us-gaap_AdditionalPaidInCapitalMember_111B78B9258ABE015F9F99C2EA1423FF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Additional paid-in capital </link:label>

<link:label id="lab_us-gaap_AdditionalPaidInCapitalMember_111B78B9258ABE015F9F99C2EA1423FF_label_en-US" xlink:label="lab_us-gaap_AdditionalPaidInCapitalMember_111B78B9258ABE015F9F99C2EA1423FF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Additional Paid-in Capital [Member] </link:label>

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<link:label id="lab_us-gaap_TreasuryStockMember_E29FA65BAB16E240F47B99C2EA14C576_terseLabel_en-US" xlink:label="lab_us-gaap_TreasuryStockMember_E29FA65BAB16E240F47B99C2EA14C576" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Treasury stock </link:label>

<link:label id="lab_us-gaap_TreasuryStockMember_E29FA65BAB16E240F47B99C2EA14C576_label_en-US" xlink:label="lab_us-gaap_TreasuryStockMember_E29FA65BAB16E240F47B99C2EA14C576" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Treasury Stock [Member] </link:label>

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<link:label id="lab_us-gaap_RetainedEarningsMember_363BEBCBA6E34116946C99C2EA140F01_terseLabel_en-US" xlink:label="lab_us-gaap_RetainedEarningsMember_363BEBCBA6E34116946C99C2EA140F01" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Retained earnings </link:label>

<link:label id="lab_us-gaap_RetainedEarningsMember_363BEBCBA6E34116946C99C2EA140F01_label_en-US" xlink:label="lab_us-gaap_RetainedEarningsMember_363BEBCBA6E34116946C99C2EA140F01" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Retained Earnings [Member] </link:label>

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<link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_5B6181CD7722F87BCF8A99C2EA15171A_verboseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_5B6181CD7722F87BCF8A99C2EA15171A" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Accumulated other comprehensive loss </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_5B6181CD7722F87BCF8A99C2EA15171A" xlink:type="locator"/>

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<link:label id="lab_us-gaap_StatementLineItems_40D4A6DDED9612DA6F1D99C2EA15840E_terseLabel_en-US" xlink:label="lab_us-gaap_StatementLineItems_40D4A6DDED9612DA6F1D99C2EA15840E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Statement [Line Items] </link:label>

<link:label id="lab_us-gaap_StatementLineItems_40D4A6DDED9612DA6F1D99C2EA15840E_label_en-US" xlink:label="lab_us-gaap_StatementLineItems_40D4A6DDED9612DA6F1D99C2EA15840E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Statement [Line Items] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_40D4A6DDED9612DA6F1D99C2EA15840E" xlink:type="locator"/>

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<link:label id="lab_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1A4EE9C8732ACDA5E45099C2EA15CA05_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1A4EE9C8732ACDA5E45099C2EA15CA05" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Stockholders' Equity [Roll Forward] </link:label>

<link:label id="lab_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1A4EE9C8732ACDA5E45099C2EA15CA05_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1A4EE9C8732ACDA5E45099C2EA15CA05" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Stockholders' Equity [Roll Forward] </link:label>

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<link:label id="lab_core_StockIssuedDuringPeriodValueStockBasedInstrumentsNetOfSharesWithheldForEmployeeTaxes_433D190E98AC2F0FDDED99C2EA16F005_negatedTerseLabel_en-US" xlink:label="lab_core_StockIssuedDuringPeriodValueStockBasedInstrumentsNetOfSharesWithheldForEmployeeTaxes_433D190E98AC2F0FDDED99C2EA16F005" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Common stock issued, net of shares withheld for employee taxes </link:label>

<link:label id="lab_core_StockIssuedDuringPeriodValueStockBasedInstrumentsNetOfSharesWithheldForEmployeeTaxes_433D190E98AC2F0FDDED99C2EA16F005_label_en-US" xlink:label="lab_core_StockIssuedDuringPeriodValueStockBasedInstrumentsNetOfSharesWithheldForEmployeeTaxes_433D190E98AC2F0FDDED99C2EA16F005" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Stock Issued During Period, Value, Stock-based Instruments, Net of Shares Withheld for Employee Taxes </link:label>

<link:label id="lab_core_StockIssuedDuringPeriodValueStockBasedInstrumentsNetOfSharesWithheldForEmployeeTaxes_433D190E98AC2F0FDDED99C2EA16F005_documentation_en-US" xlink:label="lab_core_StockIssuedDuringPeriodValueStockBasedInstrumentsNetOfSharesWithheldForEmployeeTaxes_433D190E98AC2F0FDDED99C2EA16F005" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Stock Issued During Period, Value, Stock-based Instruments, Net of Shares Withheld for Employee Taxes </link:label>

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<link:label id="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_78D6A05958591A995F9D99C2EA16295C_terseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_78D6A05958591A995F9D99C2EA16295C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Stock-based compensation expense </link:label>

<link:label id="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_78D6A05958591A995F9D99C2EA16295C_label_en-US" xlink:label="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_78D6A05958591A995F9D99C2EA16295C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> APIC, Share-based Payment Arrangement, Increase for Cost Recognition </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_78D6A05958591A995F9D99C2EA16295C" xlink:type="locator"/>

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<link:label id="lab_us-gaap_StockRepurchasedDuringPeriodValue_72583D8CE9F4B6F34BE499C2EA1668B9_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_StockRepurchasedDuringPeriodValue_72583D8CE9F4B6F34BE499C2EA1668B9" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Repurchase of common stock </link:label>

<link:label id="lab_us-gaap_StockRepurchasedDuringPeriodValue_72583D8CE9F4B6F34BE499C2EA1668B9_label_en-US" xlink:label="lab_us-gaap_StockRepurchasedDuringPeriodValue_72583D8CE9F4B6F34BE499C2EA1668B9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Stock Repurchased During Period, Value </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockRepurchasedDuringPeriodValue" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodValue_72583D8CE9F4B6F34BE499C2EA1668B9" xlink:type="locator"/>

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<link:label id="lab_us-gaap_DividendsCommonStockCash_54273E382E5163440F0E99C2EA179A86_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_DividendsCommonStockCash_54273E382E5163440F0E99C2EA179A86" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Dividends declared </link:label>

<link:label id="lab_us-gaap_DividendsCommonStockCash_54273E382E5163440F0E99C2EA179A86_label_en-US" xlink:label="lab_us-gaap_DividendsCommonStockCash_54273E382E5163440F0E99C2EA179A86" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Dividends, Common Stock, Cash </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DividendsCommonStockCash" xlink:label="loc_us-gaap_DividendsCommonStockCash_54273E382E5163440F0E99C2EA179A86" xlink:type="locator"/>

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<link:label id="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_7BD91592EC5937FF2F1799C2EA17692D_terseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_7BD91592EC5937FF2F1799C2EA17692D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other comprehensive gain (loss) </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_7BD91592EC5937FF2F1799C2EA17692D" xlink:type="locator"/>

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<link:label id="lab_us-gaap_SharesIssued_40D83ECF4C4B870E618899C2EA172CA4_periodStartLabel_en-US" xlink:label="lab_us-gaap_SharesIssued_40D83ECF4C4B870E618899C2EA172CA4" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US"> Beginning balance (in shares) </link:label>

<link:label id="lab_us-gaap_SharesIssued_40D83ECF4C4B870E618899C2EA172CA4_label_en-US" xlink:label="lab_us-gaap_SharesIssued_40D83ECF4C4B870E618899C2EA172CA4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Shares, Issued </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SharesIssued" xlink:label="loc_us-gaap_SharesIssued_40D83ECF4C4B870E618899C2EA172CA4" xlink:type="locator"/>

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<link:label id="lab_core_StockIssuedDuringPeriodSharesStockBasedInstrumentsNetOfSharesWithheldForEmployeeTaxes_E5F7426456C8000FE89499C2EA185F97_terseLabel_en-US" xlink:label="lab_core_StockIssuedDuringPeriodSharesStockBasedInstrumentsNetOfSharesWithheldForEmployeeTaxes_E5F7426456C8000FE89499C2EA185F97" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Common stock issued, net of shares withheld for employee taxes (in shares) </link:label>

<link:label id="lab_core_StockIssuedDuringPeriodSharesStockBasedInstrumentsNetOfSharesWithheldForEmployeeTaxes_E5F7426456C8000FE89499C2EA185F97_label_en-US" xlink:label="lab_core_StockIssuedDuringPeriodSharesStockBasedInstrumentsNetOfSharesWithheldForEmployeeTaxes_E5F7426456C8000FE89499C2EA185F97" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Stock Issued During Period, Shares, Stock-based Instruments, Net of Shares Withheld for Employee Taxes </link:label>

<link:label id="lab_core_StockIssuedDuringPeriodSharesStockBasedInstrumentsNetOfSharesWithheldForEmployeeTaxes_E5F7426456C8000FE89499C2EA185F97_documentation_en-US" xlink:label="lab_core_StockIssuedDuringPeriodSharesStockBasedInstrumentsNetOfSharesWithheldForEmployeeTaxes_E5F7426456C8000FE89499C2EA185F97" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Stock Issued During Period, Shares, Stock-based Instruments, Net of Shares Withheld for Employee Taxes </link:label>

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<link:label id="lab_us-gaap_StockRepurchasedDuringPeriodShares_30422D8937B02373F12199C2EA183CAB_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_StockRepurchasedDuringPeriodShares_30422D8937B02373F12199C2EA183CAB" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Repurchase of common stock (in shares) </link:label>

<link:label id="lab_us-gaap_StockRepurchasedDuringPeriodShares_30422D8937B02373F12199C2EA183CAB_label_en-US" xlink:label="lab_us-gaap_StockRepurchasedDuringPeriodShares_30422D8937B02373F12199C2EA183CAB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Stock Repurchased During Period, Shares </link:label>

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<link:label id="lab_us-gaap_SharesIssued_21DA61D1B565BD9675BE99C2EA180087_periodEndLabel_en-US" xlink:label="lab_us-gaap_SharesIssued_21DA61D1B565BD9675BE99C2EA180087" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US"> Ending balance (in shares) </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SharesIssued" xlink:label="loc_us-gaap_SharesIssued_21DA61D1B565BD9675BE99C2EA180087" xlink:type="locator"/>

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<link:label id="lab_core_SummaryofCompanyInformationTable_6BFF2DA612084080A91575B59BE41C8B_terseLabel_en-US" xlink:label="lab_core_SummaryofCompanyInformationTable_6BFF2DA612084080A91575B59BE41C8B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Summary of Company Information [Table] </link:label>

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<link:label id="lab_core_SummaryofCompanyInformationLineItems_695B05F2B7908A28117175B59BE606F6_terseLabel_en-US" xlink:label="lab_core_SummaryofCompanyInformationLineItems_695B05F2B7908A28117175B59BE606F6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Summary of Company Information [Line Items] </link:label>

<link:label id="lab_core_SummaryofCompanyInformationLineItems_695B05F2B7908A28117175B59BE606F6_label_en-US" xlink:label="lab_core_SummaryofCompanyInformationLineItems_695B05F2B7908A28117175B59BE606F6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Summary of Company Information [Line Items] </link:label>

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<link:label id="lab_core_NumberOfDistributionCenters_A5BDB6F1190099ACB9BC75B59BE6EC72_terseLabel_en-US" xlink:label="lab_core_NumberOfDistributionCenters_A5BDB6F1190099ACB9BC75B59BE6EC72" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Number of distribution centers </link:label>

<link:label id="lab_core_NumberOfDistributionCenters_A5BDB6F1190099ACB9BC75B59BE6EC72_label_en-US" xlink:label="lab_core_NumberOfDistributionCenters_A5BDB6F1190099ACB9BC75B59BE6EC72" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Number of Distribution Centers </link:label>

<link:label id="lab_core_NumberOfDistributionCenters_A5BDB6F1190099ACB9BC75B59BE6EC72_documentation_en-US" xlink:label="lab_core_NumberOfDistributionCenters_A5BDB6F1190099ACB9BC75B59BE6EC72" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Number of Distribution Centers </link:label>

<link:loc xlink:href="core-20191231.xsd#core_NumberOfDistributionCenters" xlink:label="loc_core_NumberOfDistributionCenters_A5BDB6F1190099ACB9BC75B59BE6EC72" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_NumberOfDistributionCenters_A5BDB6F1190099ACB9BC75B59BE6EC72" xlink:to="lab_core_NumberOfDistributionCenters_A5BDB6F1190099ACB9BC75B59BE6EC72" xlink:type="arc"/>

<link:label id="lab_core_NumberOfDistributionFacilitiesOperatedAsThirdPartyLogisticsProvider_4421DFC5999DEDCCE6B875B59BE69EB1_terseLabel_en-US" xlink:label="lab_core_NumberOfDistributionFacilitiesOperatedAsThirdPartyLogisticsProvider_4421DFC5999DEDCCE6B875B59BE69EB1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Number of distribution facilities operated as a third party logistics provider </link:label>

<link:label id="lab_core_NumberOfDistributionFacilitiesOperatedAsThirdPartyLogisticsProvider_4421DFC5999DEDCCE6B875B59BE69EB1_label_en-US" xlink:label="lab_core_NumberOfDistributionFacilitiesOperatedAsThirdPartyLogisticsProvider_4421DFC5999DEDCCE6B875B59BE69EB1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Number of Distribution Facilities Operated as a Third Party Logistics Provider </link:label>

<link:label id="lab_core_NumberOfDistributionFacilitiesOperatedAsThirdPartyLogisticsProvider_4421DFC5999DEDCCE6B875B59BE69EB1_documentation_en-US" xlink:label="lab_core_NumberOfDistributionFacilitiesOperatedAsThirdPartyLogisticsProvider_4421DFC5999DEDCCE6B875B59BE69EB1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Number of Distribution Facilities Operated as a Third Party Logistics Provider </link:label>

<link:loc xlink:href="core-20191231.xsd#core_NumberOfDistributionFacilitiesOperatedAsThirdPartyLogisticsProvider" xlink:label="loc_core_NumberOfDistributionFacilitiesOperatedAsThirdPartyLogisticsProvider_4421DFC5999DEDCCE6B875B59BE69EB1" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_NumberOfDistributionFacilitiesOperatedAsThirdPartyLogisticsProvider_4421DFC5999DEDCCE6B875B59BE69EB1" xlink:to="lab_core_NumberOfDistributionFacilitiesOperatedAsThirdPartyLogisticsProvider_4421DFC5999DEDCCE6B875B59BE69EB1" xlink:type="arc"/>

<link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_EFDDA852AC20D93EB4A375B59AFA9CAC_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_EFDDA852AC20D93EB4A375B59AFA9CAC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Revolving credit facility maximum borrowing capacity </link:label>

<link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_EFDDA852AC20D93EB4A375B59AFA9CAC_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_EFDDA852AC20D93EB4A375B59AFA9CAC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Maximum Borrowing Capacity </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_EFDDA852AC20D93EB4A375B59AFA9CAC" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_EFDDA852AC20D93EB4A375B59AFA9CAC" xlink:to="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_EFDDA852AC20D93EB4A375B59AFA9CAC" xlink:type="arc"/>

<link:label id="lab_us-gaap_PercentageOfLIFOInventory_AE4CAC99E380A911F81875B59BC92BAA_terseLabel_en-US" xlink:label="lab_us-gaap_PercentageOfLIFOInventory_AE4CAC99E380A911F81875B59BC92BAA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Percentage of LIFO inventory </link:label>

<link:label id="lab_us-gaap_PercentageOfLIFOInventory_AE4CAC99E380A911F81875B59BC92BAA_label_en-US" xlink:label="lab_us-gaap_PercentageOfLIFOInventory_AE4CAC99E380A911F81875B59BC92BAA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Percentage of LIFO Inventory </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PercentageOfLIFOInventory" xlink:label="loc_us-gaap_PercentageOfLIFOInventory_AE4CAC99E380A911F81875B59BC92BAA" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PercentageOfLIFOInventory_AE4CAC99E380A911F81875B59BC92BAA" xlink:to="lab_us-gaap_PercentageOfLIFOInventory_AE4CAC99E380A911F81875B59BC92BAA" xlink:type="arc"/>

<link:label id="lab_us-gaap_InventoryCurrentTable_049946F79F8D7B2245BF75B59B618432_terseLabel_en-US" xlink:label="lab_us-gaap_InventoryCurrentTable_049946F79F8D7B2245BF75B59B618432" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Inventory, Current [Table] </link:label>

<link:label id="lab_us-gaap_InventoryCurrentTable_049946F79F8D7B2245BF75B59B618432_label_en-US" xlink:label="lab_us-gaap_InventoryCurrentTable_049946F79F8D7B2245BF75B59B618432" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Inventory, Current [Table] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InventoryCurrentTable" xlink:label="loc_us-gaap_InventoryCurrentTable_049946F79F8D7B2245BF75B59B618432" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InventoryCurrentTable_049946F79F8D7B2245BF75B59B618432" xlink:to="lab_us-gaap_InventoryCurrentTable_049946F79F8D7B2245BF75B59B618432" xlink:type="arc"/>

<link:label id="lab_us-gaap_InventoryLineItems_01FF01217D13FCA237F675B59B62D5E7_terseLabel_en-US" xlink:label="lab_us-gaap_InventoryLineItems_01FF01217D13FCA237F675B59B62D5E7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Inventory [Line Items] </link:label>

<link:label id="lab_us-gaap_InventoryLineItems_01FF01217D13FCA237F675B59B62D5E7_label_en-US" xlink:label="lab_us-gaap_InventoryLineItems_01FF01217D13FCA237F675B59B62D5E7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Inventory [Line Items] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InventoryLineItems" xlink:label="loc_us-gaap_InventoryLineItems_01FF01217D13FCA237F675B59B62D5E7" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InventoryLineItems_01FF01217D13FCA237F675B59B62D5E7" xlink:to="lab_us-gaap_InventoryLineItems_01FF01217D13FCA237F675B59B62D5E7" xlink:type="arc"/>

<link:label id="lab_us-gaap_FIFOInventoryAmount_6EA5AA88222444515C3A75B59B62565E_terseLabel_en-US" xlink:label="lab_us-gaap_FIFOInventoryAmount_6EA5AA88222444515C3A75B59B62565E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Inventories at FIFO, net of reserves </link:label>

<link:label id="lab_us-gaap_FIFOInventoryAmount_6EA5AA88222444515C3A75B59B62565E_label_en-US" xlink:label="lab_us-gaap_FIFOInventoryAmount_6EA5AA88222444515C3A75B59B62565E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> FIFO Inventory Amount </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FIFOInventoryAmount" xlink:label="loc_us-gaap_FIFOInventoryAmount_6EA5AA88222444515C3A75B59B62565E" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FIFOInventoryAmount_6EA5AA88222444515C3A75B59B62565E" xlink:to="lab_us-gaap_FIFOInventoryAmount_6EA5AA88222444515C3A75B59B62565E" xlink:type="arc"/>

<link:label id="lab_us-gaap_InventoryLIFOReserve_4EA4752301787D30789A75B59B628484_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_InventoryLIFOReserve_4EA4752301787D30789A75B59B628484" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Less: LIFO reserve </link:label>

<link:label id="lab_us-gaap_InventoryLIFOReserve_4EA4752301787D30789A75B59B628484_label_en-US" xlink:label="lab_us-gaap_InventoryLIFOReserve_4EA4752301787D30789A75B59B628484" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Inventory, LIFO Reserve </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InventoryLIFOReserve" xlink:label="loc_us-gaap_InventoryLIFOReserve_4EA4752301787D30789A75B59B628484" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InventoryLIFOReserve_4EA4752301787D30789A75B59B628484" xlink:to="lab_us-gaap_InventoryLIFOReserve_4EA4752301787D30789A75B59B628484" xlink:type="arc"/>

<link:label id="lab_us-gaap_InventoryNet_EA2577DA495617719B7275B59B637CB2_totalLabel_en-US" xlink:label="lab_us-gaap_InventoryNet_EA2577DA495617719B7275B59B637CB2" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total inventories, net of reserves </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InventoryNet" xlink:label="loc_us-gaap_InventoryNet_EA2577DA495617719B7275B59B637CB2" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InventoryNet_EA2577DA495617719B7275B59B637CB2" xlink:to="lab_us-gaap_InventoryNet_EA2577DA495617719B7275B59B637CB2" xlink:type="arc"/>

<link:label id="lab_us-gaap_InventoryLIFOReserveEffectOnIncomeNet_5E72DFBB4368EB187A8175B59B633DC3_verboseLabel_en-US" xlink:label="lab_us-gaap_InventoryLIFOReserveEffectOnIncomeNet_5E72DFBB4368EB187A8175B59B633DC3" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> LIFO expense </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InventoryLIFOReserveEffectOnIncomeNet" xlink:label="loc_us-gaap_InventoryLIFOReserveEffectOnIncomeNet_5E72DFBB4368EB187A8175B59B633DC3" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InventoryLIFOReserveEffectOnIncomeNet_5E72DFBB4368EB187A8175B59B633DC3" xlink:to="lab_us-gaap_InventoryLIFOReserveEffectOnIncomeNet_5E72DFBB4368EB187A8175B59B633DC3" xlink:type="arc"/>

<link:label id="lab_core_LIFOInventoryDecrement_DB6F18981B5E05F252F175B59B636BA9_terseLabel_en-US" xlink:label="lab_core_LIFOInventoryDecrement_DB6F18981B5E05F252F175B59B636BA9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> LIFO decrement </link:label>

<link:label id="lab_core_LIFOInventoryDecrement_DB6F18981B5E05F252F175B59B636BA9_label_en-US" xlink:label="lab_core_LIFOInventoryDecrement_DB6F18981B5E05F252F175B59B636BA9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> LIFO Inventory Decrement </link:label>

<link:label id="lab_core_LIFOInventoryDecrement_DB6F18981B5E05F252F175B59B636BA9_documentation_en-US" xlink:label="lab_core_LIFOInventoryDecrement_DB6F18981B5E05F252F175B59B636BA9" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> LIFO Inventory Decrement </link:label>

<link:loc xlink:href="core-20191231.xsd#core_LIFOInventoryDecrement" xlink:label="loc_core_LIFOInventoryDecrement_DB6F18981B5E05F252F175B59B636BA9" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_LIFOInventoryDecrement_DB6F18981B5E05F252F175B59B636BA9" xlink:to="lab_core_LIFOInventoryDecrement_DB6F18981B5E05F252F175B59B636BA9" xlink:type="arc"/>

<link:label id="lab_core_InventoryLIFOReserveReduction_5B02C78BE38A64C00D6175B59B633A13_terseLabel_en-US" xlink:label="lab_core_InventoryLIFOReserveReduction_5B02C78BE38A64C00D6175B59B633A13" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Reduction in LIFO expense </link:label>

<link:label id="lab_core_InventoryLIFOReserveReduction_5B02C78BE38A64C00D6175B59B633A13_label_en-US" xlink:label="lab_core_InventoryLIFOReserveReduction_5B02C78BE38A64C00D6175B59B633A13" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Inventory, LIFO Reserve, Reduction </link:label>

<link:label id="lab_core_InventoryLIFOReserveReduction_5B02C78BE38A64C00D6175B59B633A13_documentation_en-US" xlink:label="lab_core_InventoryLIFOReserveReduction_5B02C78BE38A64C00D6175B59B633A13" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Inventory, LIFO Reserve, Reduction </link:label>

<link:loc xlink:href="core-20191231.xsd#core_InventoryLIFOReserveReduction" xlink:label="loc_core_InventoryLIFOReserveReduction_5B02C78BE38A64C00D6175B59B633A13" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_InventoryLIFOReserveReduction_5B02C78BE38A64C00D6175B59B633A13" xlink:to="lab_core_InventoryLIFOReserveReduction_5B02C78BE38A64C00D6175B59B633A13" xlink:type="arc"/>

<link:label id="lab_us-gaap_AccountingStandardsUpdate201609Member_0E730875CC69DA2EAFF875B59ADC41D6_terseLabel_en-US" xlink:label="lab_us-gaap_AccountingStandardsUpdate201609Member_0E730875CC69DA2EAFF875B59ADC41D6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accounting Standards Update 2016-09 </link:label>

<link:label id="lab_us-gaap_AccountingStandardsUpdate201609Member_0E730875CC69DA2EAFF875B59ADC41D6_label_en-US" xlink:label="lab_us-gaap_AccountingStandardsUpdate201609Member_0E730875CC69DA2EAFF875B59ADC41D6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accounting Standards Update 2016-09 [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountingStandardsUpdate201609Member" xlink:label="loc_us-gaap_AccountingStandardsUpdate201609Member_0E730875CC69DA2EAFF875B59ADC41D6" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccountingStandardsUpdate201609Member_0E730875CC69DA2EAFF875B59ADC41D6" xlink:to="lab_us-gaap_AccountingStandardsUpdate201609Member_0E730875CC69DA2EAFF875B59ADC41D6" xlink:type="arc"/>

<link:label id="lab_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_44252D26E70F808C015775B59ADE47CB_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_44252D26E70F808C015775B59ADE47CB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Federal income tax provision at the statutory rate </link:label>

<link:label id="lab_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_44252D26E70F808C015775B59ADE47CB_label_en-US" xlink:label="lab_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_44252D26E70F808C015775B59ADE47CB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate" xlink:label="loc_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_44252D26E70F808C015775B59ADE47CB" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_44252D26E70F808C015775B59ADE47CB" xlink:to="lab_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_44252D26E70F808C015775B59ADE47CB" xlink:type="arc"/>

<link:label id="lab_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_6D2DC82CE84EA754ED0075B59ADE3D9C_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_6D2DC82CE84EA754ED0075B59ADE3D9C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Increase (decrease) resulting from: </link:label>

<link:label id="lab_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_6D2DC82CE84EA754ED0075B59ADE3D9C_label_en-US" xlink:label="lab_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_6D2DC82CE84EA754ED0075B59ADE3D9C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Effective Income Tax Rate Reconciliation, Amount [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_6D2DC82CE84EA754ED0075B59ADE3D9C" xlink:type="locator"/>

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<link:label id="lab_us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes_EF637211CD44158B0F5575B59ADE40D0_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes_EF637211CD44158B0F5575B59ADE40D0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> State income taxes, net of federal benefit </link:label>

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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxReconciliationTaxCredits" xlink:label="loc_us-gaap_IncomeTaxReconciliationTaxCredits_AD4FC334E47B4226AA1675B59ADFD921" xlink:type="locator"/>

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<link:label id="lab_us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes_B3FB9F728D91FC79D58375B59AE07ECF_label_en-US" xlink:label="lab_us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes_B3FB9F728D91FC79D58375B59AE07ECF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount </link:label>

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<link:label id="lab_us-gaap_IncomeTaxReconciliationOtherAdjustments_BDC687EE0BF0DF3EEE8675B59AE01AAF_label_en-US" xlink:label="lab_us-gaap_IncomeTaxReconciliationOtherAdjustments_BDC687EE0BF0DF3EEE8675B59AE01AAF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Effective Income Tax Rate Reconciliation, Other Adjustments, Amount </link:label>

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<link:label id="lab_core_SharebasedCompensationArrangementbySharebasedPaymentAwardTotalOptionsandNonOptionEquityInstrumentsVestedandExercised_EA7644F80863A1F2B1C475B59A8C73E2_negatedLabel_en-US" xlink:label="lab_core_SharebasedCompensationArrangementbySharebasedPaymentAwardTotalOptionsandNonOptionEquityInstrumentsVestedandExercised_EA7644F80863A1F2B1C475B59A8C73E2" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Total vested/exercised, number (in shares) </link:label>

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<link:label id="lab_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardTotalOptionsAndNonOptionEquityInstrumentsForfeitures_814C470575FDA955C2DF75B59A8C2248_label_en-US" xlink:label="lab_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardTotalOptionsAndNonOptionEquityInstrumentsForfeitures_814C470575FDA955C2DF75B59A8C2248" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Total Options and Non-Option Equity Instruments, Forfeitures </link:label>

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<link:label id="lab_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardTotalOptionsAndNonOptionEquityInstrumentsExercisableNumber_642221246A324CF81E7B75B59A8DB7F8_terseLabel_en-US" xlink:label="lab_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardTotalOptionsAndNonOptionEquityInstrumentsExercisableNumber_642221246A324CF81E7B75B59A8DB7F8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Total exercisable, number (in shares) </link:label>

<link:label id="lab_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardTotalOptionsAndNonOptionEquityInstrumentsExercisableNumber_642221246A324CF81E7B75B59A8DB7F8_label_en-US" xlink:label="lab_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardTotalOptionsAndNonOptionEquityInstrumentsExercisableNumber_642221246A324CF81E7B75B59A8DB7F8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Total Options and Non-Option Equity Instruments, Exercisable, Number </link:label>

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<link:loc xlink:href="core-20191231.xsd#core_ShareBasedCompensationArrangementByShareBasedPaymentAwardTotalOptionsAndNonOptionEquityInstrumentsExercisableNumber" xlink:label="loc_core_ShareBasedCompensationArrangementByShareBasedPaymentAwardTotalOptionsAndNonOptionEquityInstrumentsExercisableNumber_642221246A324CF81E7B75B59A8DB7F8" xlink:type="locator"/>

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<link:label id="lab_us-gaap_NumberOfOperatingSegments_342702FA9597C225AFAB75B59A41421C_terseLabel_en-US" xlink:label="lab_us-gaap_NumberOfOperatingSegments_342702FA9597C225AFAB75B59A41421C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Number of operating segments </link:label>

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<link:label id="lab_us-gaap_NumberOfReportableSegments_D418DB61E0DC7BC8F5FD75B59A41DAFD_terseLabel_en-US" xlink:label="lab_us-gaap_NumberOfReportableSegments_D418DB61E0DC7BC8F5FD75B59A41DAFD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Number of reportable segments </link:label>

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<link:label id="lab_core_NumberOfGeographicalAreas_F49E404AAC762A15DCF475B59A423CB6_terseLabel_en-US" xlink:label="lab_core_NumberOfGeographicalAreas_F49E404AAC762A15DCF475B59A423CB6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Number of geographic areas </link:label>

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<link:label id="lab_us-gaap_LongTermDebtTextBlock_6FF88BC9141CD716BAAF75B59B0CD8D6_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtTextBlock_6FF88BC9141CD716BAAF75B59B0CD8D6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Long-term Debt </link:label>

<link:label id="lab_us-gaap_LongTermDebtTextBlock_6FF88BC9141CD716BAAF75B59B0CD8D6_label_en-US" xlink:label="lab_us-gaap_LongTermDebtTextBlock_6FF88BC9141CD716BAAF75B59B0CD8D6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Long-term Debt [Text Block] </link:label>

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<link:label id="lab_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1_406232ACA55D652E0F6B75B59BCDD027_negatedLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1_406232ACA55D652E0F6B75B59BCDD027" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Unrecognized actuarial losses in AOCI </link:label>

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<link:label id="lab_us-gaap_StatementOfCashFlowsAbstract_D11A87290BC1CE942F6775B59BF4C0B1_label_en-US" xlink:label="lab_us-gaap_StatementOfCashFlowsAbstract_D11A87290BC1CE942F6775B59BF4C0B1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Statement of Cash Flows [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementOfCashFlowsAbstract" xlink:label="loc_us-gaap_StatementOfCashFlowsAbstract_D11A87290BC1CE942F6775B59BF4C0B1" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_D11A87290BC1CE942F6775B59BF4C0B1" xlink:to="lab_us-gaap_StatementOfCashFlowsAbstract_D11A87290BC1CE942F6775B59BF4C0B1" xlink:type="arc"/>

<link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_14C002BA7493CD16612F75B59BF41306_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_14C002BA7493CD16612F75B59BF41306" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cash flows from operating activities: </link:label>

<link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_14C002BA7493CD16612F75B59BF41306_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_14C002BA7493CD16612F75B59BF41306" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Cash Provided by (Used in) Operating Activities [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_14C002BA7493CD16612F75B59BF41306" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_14C002BA7493CD16612F75B59BF41306" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_14C002BA7493CD16612F75B59BF41306" xlink:type="arc"/>

<link:label id="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_E1AC5407883FC4F7DC1475B59BF52205_terseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_E1AC5407883FC4F7DC1475B59BF52205" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Adjustments to reconcile net income to net cash provided by operating activities: </link:label>

<link:label id="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_E1AC5407883FC4F7DC1475B59BF52205_label_en-US" xlink:label="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_E1AC5407883FC4F7DC1475B59BF52205" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_E1AC5407883FC4F7DC1475B59BF52205" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_E1AC5407883FC4F7DC1475B59BF52205" xlink:to="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_E1AC5407883FC4F7DC1475B59BF52205" xlink:type="arc"/>

<link:label id="lab_core_LifoAndInventoryProvisions_D660CECFCDC08F99788375B59BF5387A_terseLabel_en-US" xlink:label="lab_core_LifoAndInventoryProvisions_D660CECFCDC08F99788375B59BF5387A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> LIFO and inventory provisions </link:label>

<link:label id="lab_core_LifoAndInventoryProvisions_D660CECFCDC08F99788375B59BF5387A_label_en-US" xlink:label="lab_core_LifoAndInventoryProvisions_D660CECFCDC08F99788375B59BF5387A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> LIFO and inventory provisions </link:label>

<link:label id="lab_core_LifoAndInventoryProvisions_D660CECFCDC08F99788375B59BF5387A_documentation_en-US" xlink:label="lab_core_LifoAndInventoryProvisions_D660CECFCDC08F99788375B59BF5387A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> The net change in inventory reserves for the period attributable to LIFO expense (benefit) and inventory write-offs. </link:label>

<link:loc xlink:href="core-20191231.xsd#core_LifoAndInventoryProvisions" xlink:label="loc_core_LifoAndInventoryProvisions_D660CECFCDC08F99788375B59BF5387A" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_LifoAndInventoryProvisions_D660CECFCDC08F99788375B59BF5387A" xlink:to="lab_core_LifoAndInventoryProvisions_D660CECFCDC08F99788375B59BF5387A" xlink:type="arc"/>

<link:label id="lab_us-gaap_AmortizationOfFinancingCosts_A2F01B83EB0E4A3A117F75B59BF528A1_terseLabel_en-US" xlink:label="lab_us-gaap_AmortizationOfFinancingCosts_A2F01B83EB0E4A3A117F75B59BF528A1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Amortization of debt issuance costs </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AmortizationOfFinancingCosts" xlink:label="loc_us-gaap_AmortizationOfFinancingCosts_A2F01B83EB0E4A3A117F75B59BF528A1" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AmortizationOfFinancingCosts_A2F01B83EB0E4A3A117F75B59BF528A1" xlink:to="lab_us-gaap_AmortizationOfFinancingCosts_A2F01B83EB0E4A3A117F75B59BF528A1" xlink:type="arc"/>

<link:label id="lab_us-gaap_ShareBasedCompensation_B851DF69375827588F4875B59BF59118_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensation_B851DF69375827588F4875B59BF59118" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Stock-based compensation expense </link:label>

<link:label id="lab_us-gaap_ShareBasedCompensation_B851DF69375827588F4875B59BF59118_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensation_B851DF69375827588F4875B59BF59118" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Payment Arrangement, Noncash Expense </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaap_ShareBasedCompensation_B851DF69375827588F4875B59BF59118" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensation_B851DF69375827588F4875B59BF59118" xlink:to="lab_us-gaap_ShareBasedCompensation_B851DF69375827588F4875B59BF59118" xlink:type="arc"/>

<link:label id="lab_us-gaap_ProvisionForDoubtfulAccounts_74A60ACA2A81ABB293D075B59BF6FCDD_terseLabel_en-US" xlink:label="lab_us-gaap_ProvisionForDoubtfulAccounts_74A60ACA2A81ABB293D075B59BF6FCDD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Bad debt expense, net </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProvisionForDoubtfulAccounts" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_74A60ACA2A81ABB293D075B59BF6FCDD" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProvisionForDoubtfulAccounts_74A60ACA2A81ABB293D075B59BF6FCDD" xlink:to="lab_us-gaap_ProvisionForDoubtfulAccounts_74A60ACA2A81ABB293D075B59BF6FCDD" xlink:type="arc"/>

<link:label id="lab_us-gaap_GainLossOnDispositionOfAssets1_9B6658D3BEA8D5CC3BB475B59BF62D49_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_GainLossOnDispositionOfAssets1_9B6658D3BEA8D5CC3BB475B59BF62D49" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Loss (gain) on disposals </link:label>

<link:label id="lab_us-gaap_GainLossOnDispositionOfAssets1_9B6658D3BEA8D5CC3BB475B59BF62D49_label_en-US" xlink:label="lab_us-gaap_GainLossOnDispositionOfAssets1_9B6658D3BEA8D5CC3BB475B59BF62D49" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Gain (Loss) on Disposition of Assets </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GainLossOnDispositionOfAssets1" xlink:label="loc_us-gaap_GainLossOnDispositionOfAssets1_9B6658D3BEA8D5CC3BB475B59BF62D49" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GainLossOnDispositionOfAssets1_9B6658D3BEA8D5CC3BB475B59BF62D49" xlink:to="lab_us-gaap_GainLossOnDispositionOfAssets1_9B6658D3BEA8D5CC3BB475B59BF62D49" xlink:type="arc"/>

<link:label id="lab_us-gaap_ForeignCurrencyTransactionGainLossRealized_42A8F91B04B3C8C9F09975B59BF6CAC0_negatedLabel_en-US" xlink:label="lab_us-gaap_ForeignCurrencyTransactionGainLossRealized_42A8F91B04B3C8C9F09975B59BF6CAC0" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Foreign currency transaction losses (gains) </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ForeignCurrencyTransactionGainLossRealized" xlink:label="loc_us-gaap_ForeignCurrencyTransactionGainLossRealized_42A8F91B04B3C8C9F09975B59BF6CAC0" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ForeignCurrencyTransactionGainLossRealized_42A8F91B04B3C8C9F09975B59BF6CAC0" xlink:to="lab_us-gaap_ForeignCurrencyTransactionGainLossRealized_42A8F91B04B3C8C9F09975B59BF6CAC0" xlink:type="arc"/>

<link:label id="lab_us-gaap_DeferredIncomeTaxesAndTaxCredits_CAA1F443E9F381C691DD75B59BF66FDF_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxesAndTaxCredits_CAA1F443E9F381C691DD75B59BF66FDF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Deferred income taxes </link:label>

<link:label id="lab_us-gaap_DeferredIncomeTaxesAndTaxCredits_CAA1F443E9F381C691DD75B59BF66FDF_label_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxesAndTaxCredits_CAA1F443E9F381C691DD75B59BF66FDF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deferred Income Taxes and Tax Credits </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredIncomeTaxesAndTaxCredits" xlink:label="loc_us-gaap_DeferredIncomeTaxesAndTaxCredits_CAA1F443E9F381C691DD75B59BF66FDF" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredIncomeTaxesAndTaxCredits_CAA1F443E9F381C691DD75B59BF66FDF" xlink:to="lab_us-gaap_DeferredIncomeTaxesAndTaxCredits_CAA1F443E9F381C691DD75B59BF66FDF" xlink:type="arc"/>

<link:label id="lab_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1_BB08394F5F904DA4200975B59BF773C3_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1_BB08394F5F904DA4200975B59BF773C3" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Pension termination settlement </link:label>

<link:label id="lab_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1_BB08394F5F904DA4200975B59BF773C3_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1_BB08394F5F904DA4200975B59BF773C3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1" xlink:label="loc_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1_BB08394F5F904DA4200975B59BF773C3" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1_BB08394F5F904DA4200975B59BF773C3" xlink:to="lab_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1_BB08394F5F904DA4200975B59BF773C3" xlink:type="arc"/>

<link:label id="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_EADA92146C5A87767B0F75B59BF72958_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_EADA92146C5A87767B0F75B59BF72958" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Changes in operating assets and liabilities: </link:label>

<link:label id="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_EADA92146C5A87767B0F75B59BF72958_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_EADA92146C5A87767B0F75B59BF72958" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Operating Capital [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_EADA92146C5A87767B0F75B59BF72958" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_EADA92146C5A87767B0F75B59BF72958" xlink:to="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_EADA92146C5A87767B0F75B59BF72958" xlink:type="arc"/>

<link:label id="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_6AB1064AA5CA59C2FFE775B59BF78CF5_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_6AB1064AA5CA59C2FFE775B59BF78CF5" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Accounts receivable, net </link:label>

<link:label id="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_6AB1064AA5CA59C2FFE775B59BF78CF5_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_6AB1064AA5CA59C2FFE775B59BF78CF5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Accounts Receivable </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_6AB1064AA5CA59C2FFE775B59BF78CF5" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_6AB1064AA5CA59C2FFE775B59BF78CF5" xlink:to="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_6AB1064AA5CA59C2FFE775B59BF78CF5" xlink:type="arc"/>

<link:label id="lab_us-gaap_IncreaseDecreaseInOtherReceivables_84E47A672C4BE2DFA57075B59BF7E6AE_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOtherReceivables_84E47A672C4BE2DFA57075B59BF7E6AE" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Other receivables, net </link:label>

<link:label id="lab_us-gaap_IncreaseDecreaseInOtherReceivables_84E47A672C4BE2DFA57075B59BF7E6AE_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOtherReceivables_84E47A672C4BE2DFA57075B59BF7E6AE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Other Receivables </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInOtherReceivables" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherReceivables_84E47A672C4BE2DFA57075B59BF7E6AE" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInOtherReceivables_84E47A672C4BE2DFA57075B59BF7E6AE" xlink:to="lab_us-gaap_IncreaseDecreaseInOtherReceivables_84E47A672C4BE2DFA57075B59BF7E6AE" xlink:type="arc"/>

<link:label id="lab_us-gaap_IncreaseDecreaseInInventories_069F19E5455F4229052675B59BF7E445_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInInventories_069F19E5455F4229052675B59BF7E445" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Inventories, net </link:label>

<link:label id="lab_us-gaap_IncreaseDecreaseInInventories_069F19E5455F4229052675B59BF7E445_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInInventories_069F19E5455F4229052675B59BF7E445" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Inventories </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInInventories" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_069F19E5455F4229052675B59BF7E445" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInInventories_069F19E5455F4229052675B59BF7E445" xlink:to="lab_us-gaap_IncreaseDecreaseInInventories_069F19E5455F4229052675B59BF7E445" xlink:type="arc"/>

<link:label id="lab_us-gaap_IncreaseDecreaseInOtherOperatingAssets_1C13BDE1878AAE7FA13C75B59BF77FC2_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOtherOperatingAssets_1C13BDE1878AAE7FA13C75B59BF77FC2" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Deposits, prepayments and other non-current assets </link:label>

<link:label id="lab_us-gaap_IncreaseDecreaseInOtherOperatingAssets_1C13BDE1878AAE7FA13C75B59BF77FC2_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOtherOperatingAssets_1C13BDE1878AAE7FA13C75B59BF77FC2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Other Operating Assets </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_1C13BDE1878AAE7FA13C75B59BF77FC2" xlink:type="locator"/>

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<link:label id="lab_us-gaap_IncreaseDecreaseInAccountsPayable_1B7C2FDE7B6634600DCE75B59BF80A66_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsPayable_1B7C2FDE7B6634600DCE75B59BF80A66" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accounts payable </link:label>

<link:label id="lab_us-gaap_IncreaseDecreaseInAccountsPayable_1B7C2FDE7B6634600DCE75B59BF80A66_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsPayable_1B7C2FDE7B6634600DCE75B59BF80A66" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Accounts Payable </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_1B7C2FDE7B6634600DCE75B59BF80A66" xlink:type="locator"/>

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<link:label id="lab_core_IncreaseDecreaseInCigaretteAndTobaccoTaxesPayable_2FE9D7E0F6A8D621EA9E75B59BF81CAD_terseLabel_en-US" xlink:label="lab_core_IncreaseDecreaseInCigaretteAndTobaccoTaxesPayable_2FE9D7E0F6A8D621EA9E75B59BF81CAD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cigarette and tobacco taxes payable </link:label>

<link:label id="lab_core_IncreaseDecreaseInCigaretteAndTobaccoTaxesPayable_2FE9D7E0F6A8D621EA9E75B59BF81CAD_label_en-US" xlink:label="lab_core_IncreaseDecreaseInCigaretteAndTobaccoTaxesPayable_2FE9D7E0F6A8D621EA9E75B59BF81CAD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Cigarette and Tobacco Taxes Payable </link:label>

<link:label id="lab_core_IncreaseDecreaseInCigaretteAndTobaccoTaxesPayable_2FE9D7E0F6A8D621EA9E75B59BF81CAD_documentation_en-US" xlink:label="lab_core_IncreaseDecreaseInCigaretteAndTobaccoTaxesPayable_2FE9D7E0F6A8D621EA9E75B59BF81CAD" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> The increase (decrease) during the reporting period in amount of obligations incurred and payable for statutory cigarette and tobacco taxes due within one year. </link:label>

<link:loc xlink:href="core-20191231.xsd#core_IncreaseDecreaseInCigaretteAndTobaccoTaxesPayable" xlink:label="loc_core_IncreaseDecreaseInCigaretteAndTobaccoTaxesPayable_2FE9D7E0F6A8D621EA9E75B59BF81CAD" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_IncreaseDecreaseInCigaretteAndTobaccoTaxesPayable_2FE9D7E0F6A8D621EA9E75B59BF81CAD" xlink:to="lab_core_IncreaseDecreaseInCigaretteAndTobaccoTaxesPayable_2FE9D7E0F6A8D621EA9E75B59BF81CAD" xlink:type="arc"/>

<link:label id="lab_us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities_A363F993E7EAD179D9BB75B59BF8C09C_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities_A363F993E7EAD179D9BB75B59BF8C09C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Claims, accrued and other long-term liabilities </link:label>

<link:label id="lab_us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities_A363F993E7EAD179D9BB75B59BF8C09C_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities_A363F993E7EAD179D9BB75B59BF8C09C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities_A363F993E7EAD179D9BB75B59BF8C09C" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities_A363F993E7EAD179D9BB75B59BF8C09C" xlink:to="lab_us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities_A363F993E7EAD179D9BB75B59BF8C09C" xlink:type="arc"/>

<link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_DC7B1F5E861EA897EAED75B59BF875CE_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_DC7B1F5E861EA897EAED75B59BF875CE" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Net cash provided by operating activities </link:label>

<link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_DC7B1F5E861EA897EAED75B59BF875CE_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_DC7B1F5E861EA897EAED75B59BF875CE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Cash Provided by (Used in) Operating Activities </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_DC7B1F5E861EA897EAED75B59BF875CE" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_DC7B1F5E861EA897EAED75B59BF875CE" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_DC7B1F5E861EA897EAED75B59BF875CE" xlink:type="arc"/>

<link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_410D61CAB7127D16CA1D75B59BF8AE80_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_410D61CAB7127D16CA1D75B59BF8AE80" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cash flows from investing activities: </link:label>

<link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_410D61CAB7127D16CA1D75B59BF8AE80_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_410D61CAB7127D16CA1D75B59BF8AE80" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Cash Provided by (Used in) Investing Activities [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_410D61CAB7127D16CA1D75B59BF8AE80" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_410D61CAB7127D16CA1D75B59BF8AE80" xlink:to="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_410D61CAB7127D16CA1D75B59BF8AE80" xlink:type="arc"/>

<link:label id="lab_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_1779FE27EABCA472457775B59BF8B188_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_1779FE27EABCA472457775B59BF8B188" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Acquisition of business, net of cash acquired </link:label>

<link:label id="lab_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_1779FE27EABCA472457775B59BF8B188_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_1779FE27EABCA472457775B59BF8B188" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payments to Acquire Businesses, Net of Cash Acquired </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_1779FE27EABCA472457775B59BF8B188" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_1779FE27EABCA472457775B59BF8B188" xlink:to="lab_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_1779FE27EABCA472457775B59BF8B188" xlink:type="arc"/>

<link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_800D379E23658E3870DD75B59BF91F72_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_800D379E23658E3870DD75B59BF91F72" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Additions to property and equipment, net </link:label>

<link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_800D379E23658E3870DD75B59BF91F72_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_800D379E23658E3870DD75B59BF91F72" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payments to Acquire Property, Plant, and Equipment </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_800D379E23658E3870DD75B59BF91F72" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_800D379E23658E3870DD75B59BF91F72" xlink:to="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_800D379E23658E3870DD75B59BF91F72" xlink:type="arc"/>

<link:label id="lab_us-gaap_PaymentsToDevelopSoftware_CE813B698D75FCAFA9D875B59BF9D39C_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsToDevelopSoftware_CE813B698D75FCAFA9D875B59BF9D39C" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Capitalization of software and related development costs </link:label>

<link:label id="lab_us-gaap_PaymentsToDevelopSoftware_CE813B698D75FCAFA9D875B59BF9D39C_label_en-US" xlink:label="lab_us-gaap_PaymentsToDevelopSoftware_CE813B698D75FCAFA9D875B59BF9D39C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payments to Develop Software </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsToDevelopSoftware" xlink:label="loc_us-gaap_PaymentsToDevelopSoftware_CE813B698D75FCAFA9D875B59BF9D39C" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsToDevelopSoftware_CE813B698D75FCAFA9D875B59BF9D39C" xlink:to="lab_us-gaap_PaymentsToDevelopSoftware_CE813B698D75FCAFA9D875B59BF9D39C" xlink:type="arc"/>

<link:label id="lab_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_D88406AC87B71915B64075B59BF999AE_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_D88406AC87B71915B64075B59BF999AE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Proceeds from sale of property and equipment </link:label>

<link:label id="lab_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_D88406AC87B71915B64075B59BF999AE_label_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_D88406AC87B71915B64075B59BF999AE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Proceeds from Sale of Property, Plant, and Equipment </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment" xlink:label="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_D88406AC87B71915B64075B59BF999AE" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_D88406AC87B71915B64075B59BF999AE" xlink:to="lab_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_D88406AC87B71915B64075B59BF999AE" xlink:type="arc"/>

<link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_19C07A808EBE67ED074275B59BF904B0_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_19C07A808EBE67ED074275B59BF904B0" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Net cash used in investing activities </link:label>

<link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_19C07A808EBE67ED074275B59BF904B0_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_19C07A808EBE67ED074275B59BF904B0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Cash Provided by (Used in) Investing Activities </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_19C07A808EBE67ED074275B59BF904B0" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_19C07A808EBE67ED074275B59BF904B0" xlink:to="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_19C07A808EBE67ED074275B59BF904B0" xlink:type="arc"/>

<link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_3B10562396B0E3FA011B75B59BF9468D_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_3B10562396B0E3FA011B75B59BF9468D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cash flows from financing activities: </link:label>

<link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_3B10562396B0E3FA011B75B59BF9468D_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_3B10562396B0E3FA011B75B59BF9468D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Cash Provided by (Used in) Financing Activities [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_3B10562396B0E3FA011B75B59BF9468D" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_3B10562396B0E3FA011B75B59BF9468D" xlink:to="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_3B10562396B0E3FA011B75B59BF9468D" xlink:type="arc"/>

<link:label id="lab_us-gaap_ProceedsFromLinesOfCredit_A477E756ACC0B1E1B8AE75B59BF9D603_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromLinesOfCredit_A477E756ACC0B1E1B8AE75B59BF9D603" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Borrowings under revolving credit facility </link:label>

<link:label id="lab_us-gaap_ProceedsFromLinesOfCredit_A477E756ACC0B1E1B8AE75B59BF9D603_label_en-US" xlink:label="lab_us-gaap_ProceedsFromLinesOfCredit_A477E756ACC0B1E1B8AE75B59BF9D603" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Proceeds from Lines of Credit </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromLinesOfCredit" xlink:label="loc_us-gaap_ProceedsFromLinesOfCredit_A477E756ACC0B1E1B8AE75B59BF9D603" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromLinesOfCredit_A477E756ACC0B1E1B8AE75B59BF9D603" xlink:to="lab_us-gaap_ProceedsFromLinesOfCredit_A477E756ACC0B1E1B8AE75B59BF9D603" xlink:type="arc"/>

<link:label id="lab_us-gaap_RepaymentsOfLinesOfCredit_B2A69D7DB04D119114D275B59BFA7600_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_RepaymentsOfLinesOfCredit_B2A69D7DB04D119114D275B59BFA7600" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Repayments under revolving credit facility </link:label>

<link:label id="lab_us-gaap_RepaymentsOfLinesOfCredit_B2A69D7DB04D119114D275B59BFA7600_label_en-US" xlink:label="lab_us-gaap_RepaymentsOfLinesOfCredit_B2A69D7DB04D119114D275B59BFA7600" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Repayments of Lines of Credit </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RepaymentsOfLinesOfCredit" xlink:label="loc_us-gaap_RepaymentsOfLinesOfCredit_B2A69D7DB04D119114D275B59BFA7600" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RepaymentsOfLinesOfCredit_B2A69D7DB04D119114D275B59BFA7600" xlink:to="lab_us-gaap_RepaymentsOfLinesOfCredit_B2A69D7DB04D119114D275B59BFA7600" xlink:type="arc"/>

<link:label id="lab_us-gaap_PaymentsOfFinancingCosts_1CC7F08DA47FEB3E8E7A75B59BFAA060_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsOfFinancingCosts_1CC7F08DA47FEB3E8E7A75B59BFAA060" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Payments of financing costs </link:label>

<link:label id="lab_us-gaap_PaymentsOfFinancingCosts_1CC7F08DA47FEB3E8E7A75B59BFAA060_label_en-US" xlink:label="lab_us-gaap_PaymentsOfFinancingCosts_1CC7F08DA47FEB3E8E7A75B59BFAA060" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payments of Financing Costs </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsOfFinancingCosts" xlink:label="loc_us-gaap_PaymentsOfFinancingCosts_1CC7F08DA47FEB3E8E7A75B59BFAA060" xlink:type="locator"/>

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<link:label id="lab_us-gaap_RepaymentsOfLongTermCapitalLeaseObligations_4C2758503FE7A19136CA75B59BFAC035_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_RepaymentsOfLongTermCapitalLeaseObligations_4C2758503FE7A19136CA75B59BFAC035" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Payments of finance leases </link:label>

<link:label id="lab_us-gaap_RepaymentsOfLongTermCapitalLeaseObligations_4C2758503FE7A19136CA75B59BFAC035_label_en-US" xlink:label="lab_us-gaap_RepaymentsOfLongTermCapitalLeaseObligations_4C2758503FE7A19136CA75B59BFAC035" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Repayments of Long-term Capital Lease Obligations </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RepaymentsOfLongTermCapitalLeaseObligations" xlink:label="loc_us-gaap_RepaymentsOfLongTermCapitalLeaseObligations_4C2758503FE7A19136CA75B59BFAC035" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RepaymentsOfLongTermCapitalLeaseObligations_4C2758503FE7A19136CA75B59BFAC035" xlink:to="lab_us-gaap_RepaymentsOfLongTermCapitalLeaseObligations_4C2758503FE7A19136CA75B59BFAC035" xlink:type="arc"/>

<link:label id="lab_us-gaap_PaymentsOfDividendsCommonStock_2183B25543AE42F26FE675B59BFA7529_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsOfDividendsCommonStock_2183B25543AE42F26FE675B59BFA7529" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Dividends paid </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsOfDividendsCommonStock" xlink:label="loc_us-gaap_PaymentsOfDividendsCommonStock_2183B25543AE42F26FE675B59BFA7529" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsOfDividendsCommonStock_2183B25543AE42F26FE675B59BFA7529" xlink:to="lab_us-gaap_PaymentsOfDividendsCommonStock_2183B25543AE42F26FE675B59BFA7529" xlink:type="arc"/>

<link:label id="lab_us-gaap_PaymentsForRepurchaseOfCommonStock_C30880547A6787C1B38B75B59BFAB384_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsForRepurchaseOfCommonStock_C30880547A6787C1B38B75B59BFAB384" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Repurchases of common stock </link:label>

<link:label id="lab_us-gaap_PaymentsForRepurchaseOfCommonStock_C30880547A6787C1B38B75B59BFAB384_label_en-US" xlink:label="lab_us-gaap_PaymentsForRepurchaseOfCommonStock_C30880547A6787C1B38B75B59BFAB384" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payments for Repurchase of Common Stock </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_C30880547A6787C1B38B75B59BFAB384" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_C30880547A6787C1B38B75B59BFAB384" xlink:to="lab_us-gaap_PaymentsForRepurchaseOfCommonStock_C30880547A6787C1B38B75B59BFAB384" xlink:type="arc"/>

<link:label id="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_EA0F3B52A3E08DD2B04175B59BFBAEEF_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_EA0F3B52A3E08DD2B04175B59BFBAEEF" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Tax withholdings related to net share settlements of restricted stock units </link:label>

<link:label id="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_EA0F3B52A3E08DD2B04175B59BFBAEEF_label_en-US" xlink:label="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_EA0F3B52A3E08DD2B04175B59BFBAEEF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payment, Tax Withholding, Share-based Payment Arrangement </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_EA0F3B52A3E08DD2B04175B59BFBAEEF" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_EA0F3B52A3E08DD2B04175B59BFBAEEF" xlink:to="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_EA0F3B52A3E08DD2B04175B59BFBAEEF" xlink:type="arc"/>

<link:label id="lab_us-gaap_IncreaseDecreaseInOutstandingChecksFinancingActivities_7D5E1A2215D64490406C75B59BFBE52A_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOutstandingChecksFinancingActivities_7D5E1A2215D64490406C75B59BFBE52A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> (Decrease) Increase in book overdrafts, net </link:label>

<link:label id="lab_us-gaap_IncreaseDecreaseInOutstandingChecksFinancingActivities_7D5E1A2215D64490406C75B59BFBE52A_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOutstandingChecksFinancingActivities_7D5E1A2215D64490406C75B59BFBE52A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Outstanding Checks, Financing Activities </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInOutstandingChecksFinancingActivities" xlink:label="loc_us-gaap_IncreaseDecreaseInOutstandingChecksFinancingActivities_7D5E1A2215D64490406C75B59BFBE52A" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInOutstandingChecksFinancingActivities_7D5E1A2215D64490406C75B59BFBE52A" xlink:to="lab_us-gaap_IncreaseDecreaseInOutstandingChecksFinancingActivities_7D5E1A2215D64490406C75B59BFBE52A" xlink:type="arc"/>

<link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_42F56DF1F998DA48C0CE75B59BFBBCB5_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_42F56DF1F998DA48C0CE75B59BFBBCB5" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Net cash (used in) provided by financing activities </link:label>

<link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_42F56DF1F998DA48C0CE75B59BFBBCB5_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_42F56DF1F998DA48C0CE75B59BFBBCB5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Cash Provided by (Used in) Financing Activities </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_42F56DF1F998DA48C0CE75B59BFBBCB5" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_42F56DF1F998DA48C0CE75B59BFBBCB5" xlink:to="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_42F56DF1F998DA48C0CE75B59BFBBCB5" xlink:type="arc"/>

<link:label id="lab_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_9BDC2C5C550EA20503C575B59BFB4E89_terseLabel_en-US" xlink:label="lab_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_9BDC2C5C550EA20503C575B59BFB4E89" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Effects of changes in foreign exchange rates </link:label>

<link:label id="lab_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_9BDC2C5C550EA20503C575B59BFB4E89_label_en-US" xlink:label="lab_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_9BDC2C5C550EA20503C575B59BFB4E89" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_9BDC2C5C550EA20503C575B59BFB4E89" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_9BDC2C5C550EA20503C575B59BFB4E89" xlink:to="lab_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_9BDC2C5C550EA20503C575B59BFB4E89" xlink:type="arc"/>

<link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_E8565EA4168BF4614F7375B59BFB2094_totalLabel_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_E8565EA4168BF4614F7375B59BFB2094" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Change in cash, cash equivalents and restricted cash </link:label>

<link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_E8565EA4168BF4614F7375B59BFB2094_label_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_E8565EA4168BF4614F7375B59BFB2094" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_E8565EA4168BF4614F7375B59BFB2094" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_E8565EA4168BF4614F7375B59BFB2094" xlink:to="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_E8565EA4168BF4614F7375B59BFB2094" xlink:type="arc"/>

<link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_D0AB784E1A74A9E5E89875B59BFB909F_periodStartLabel_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_D0AB784E1A74A9E5E89875B59BFB909F" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US"> Cash, cash equivalents and restricted cash at beginning of period </link:label>

<link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_D0AB784E1A74A9E5E89875B59BFB909F_label_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_D0AB784E1A74A9E5E89875B59BFB909F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_D0AB784E1A74A9E5E89875B59BFB909F" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_D0AB784E1A74A9E5E89875B59BFB909F" xlink:to="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_D0AB784E1A74A9E5E89875B59BFB909F" xlink:type="arc"/>

<link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_09DECB085419605A914B75B59BFC0116_periodEndLabel_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_09DECB085419605A914B75B59BFC0116" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US"> Cash, cash equivalents and restricted cash at end of period </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_09DECB085419605A914B75B59BFC0116" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_09DECB085419605A914B75B59BFC0116" xlink:to="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_09DECB085419605A914B75B59BFC0116" xlink:type="arc"/>

<link:label id="lab_us-gaap_SupplementalCashFlowInformationAbstract_527D503D215D6495363E75B59BFCDF0D_terseLabel_en-US" xlink:label="lab_us-gaap_SupplementalCashFlowInformationAbstract_527D503D215D6495363E75B59BFCDF0D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Supplemental disclosures: </link:label>

<link:label id="lab_us-gaap_SupplementalCashFlowInformationAbstract_527D503D215D6495363E75B59BFCDF0D_label_en-US" xlink:label="lab_us-gaap_SupplementalCashFlowInformationAbstract_527D503D215D6495363E75B59BFCDF0D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Supplemental Cash Flow Information [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SupplementalCashFlowInformationAbstract" xlink:label="loc_us-gaap_SupplementalCashFlowInformationAbstract_527D503D215D6495363E75B59BFCDF0D" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_527D503D215D6495363E75B59BFCDF0D" xlink:to="lab_us-gaap_SupplementalCashFlowInformationAbstract_527D503D215D6495363E75B59BFCDF0D" xlink:type="arc"/>

<link:label id="lab_us-gaap_SupplementalCashFlowElementsAbstract_7456903E13E9EF38C4F875B59BFC5E63_terseLabel_en-US" xlink:label="lab_us-gaap_SupplementalCashFlowElementsAbstract_7456903E13E9EF38C4F875B59BFC5E63" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cash received (paid) during the period for: </link:label>

<link:label id="lab_us-gaap_SupplementalCashFlowElementsAbstract_7456903E13E9EF38C4F875B59BFC5E63_label_en-US" xlink:label="lab_us-gaap_SupplementalCashFlowElementsAbstract_7456903E13E9EF38C4F875B59BFC5E63" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Supplemental Cash Flow Elements [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SupplementalCashFlowElementsAbstract" xlink:label="loc_us-gaap_SupplementalCashFlowElementsAbstract_7456903E13E9EF38C4F875B59BFC5E63" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SupplementalCashFlowElementsAbstract_7456903E13E9EF38C4F875B59BFC5E63" xlink:to="lab_us-gaap_SupplementalCashFlowElementsAbstract_7456903E13E9EF38C4F875B59BFC5E63" xlink:type="arc"/>

<link:label id="lab_us-gaap_IncomeTaxesPaidNet_45304AC66A41773C2F4C75B59BFCE56A_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxesPaidNet_45304AC66A41773C2F4C75B59BFCE56A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Income taxes, net </link:label>

<link:label id="lab_us-gaap_IncomeTaxesPaidNet_45304AC66A41773C2F4C75B59BFCE56A_label_en-US" xlink:label="lab_us-gaap_IncomeTaxesPaidNet_45304AC66A41773C2F4C75B59BFCE56A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Income Taxes Paid, Net </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxesPaidNet" xlink:label="loc_us-gaap_IncomeTaxesPaidNet_45304AC66A41773C2F4C75B59BFCE56A" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeTaxesPaidNet_45304AC66A41773C2F4C75B59BFCE56A" xlink:to="lab_us-gaap_IncomeTaxesPaidNet_45304AC66A41773C2F4C75B59BFCE56A" xlink:type="arc"/>

<link:label id="lab_us-gaap_InterestPaidNet_BEB59CBC7B8B713CB11E75B59BFDA07A_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_InterestPaidNet_BEB59CBC7B8B713CB11E75B59BFDA07A" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Interest paid </link:label>

<link:label id="lab_us-gaap_InterestPaidNet_BEB59CBC7B8B713CB11E75B59BFDA07A_label_en-US" xlink:label="lab_us-gaap_InterestPaidNet_BEB59CBC7B8B713CB11E75B59BFDA07A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Interest Paid, Excluding Capitalized Interest, Operating Activities </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestPaidNet" xlink:label="loc_us-gaap_InterestPaidNet_BEB59CBC7B8B713CB11E75B59BFDA07A" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InterestPaidNet_BEB59CBC7B8B713CB11E75B59BFDA07A" xlink:to="lab_us-gaap_InterestPaidNet_BEB59CBC7B8B713CB11E75B59BFDA07A" xlink:type="arc"/>

<link:label id="lab_core_BusinessAcquisitionIndemnityHoldback_1A3C1DCCB50F6C629F9975B59BFDE572_terseLabel_en-US" xlink:label="lab_core_BusinessAcquisitionIndemnityHoldback_1A3C1DCCB50F6C629F9975B59BFDE572" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Non-cash indemnification holdback </link:label>

<link:label id="lab_core_BusinessAcquisitionIndemnityHoldback_1A3C1DCCB50F6C629F9975B59BFDE572_label_en-US" xlink:label="lab_core_BusinessAcquisitionIndemnityHoldback_1A3C1DCCB50F6C629F9975B59BFDE572" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Business Acquisition, Indemnity Holdback </link:label>

<link:label id="lab_core_BusinessAcquisitionIndemnityHoldback_1A3C1DCCB50F6C629F9975B59BFDE572_documentation_en-US" xlink:label="lab_core_BusinessAcquisitionIndemnityHoldback_1A3C1DCCB50F6C629F9975B59BFDE572" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Business Acquisition, Indemnity Holdback </link:label>

<link:loc xlink:href="core-20191231.xsd#core_BusinessAcquisitionIndemnityHoldback" xlink:label="loc_core_BusinessAcquisitionIndemnityHoldback_1A3C1DCCB50F6C629F9975B59BFDE572" xlink:type="locator"/>

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<link:label id="lab_us-gaap_CapitalExpendituresIncurredButNotYetPaid_5A7C8D1EAEA1ABBE705075B59BFDFD47_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalExpendituresIncurredButNotYetPaid_5A7C8D1EAEA1ABBE705075B59BFDFD47" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Unpaid property and equipment purchases included in accrued liabilities </link:label>

<link:label id="lab_us-gaap_CapitalExpendituresIncurredButNotYetPaid_5A7C8D1EAEA1ABBE705075B59BFDFD47_label_en-US" xlink:label="lab_us-gaap_CapitalExpendituresIncurredButNotYetPaid_5A7C8D1EAEA1ABBE705075B59BFDFD47" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Capital Expenditures Incurred but Not yet Paid </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalExpendituresIncurredButNotYetPaid" xlink:label="loc_us-gaap_CapitalExpendituresIncurredButNotYetPaid_5A7C8D1EAEA1ABBE705075B59BFDFD47" xlink:type="locator"/>

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<link:label id="lab_core_NoncashOrPartNoncashAdjustmentBetweenOtherNoncurrentAssetsAndOtherLongTermLiabilities_E6DA068DD9A94ED22F5375B59BFDF170_terseLabel_en-US" xlink:label="lab_core_NoncashOrPartNoncashAdjustmentBetweenOtherNoncurrentAssetsAndOtherLongTermLiabilities_E6DA068DD9A94ED22F5375B59BFDF170" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Non-cash transactions between other non-current assets and other long-term liabilities </link:label>

<link:label id="lab_core_NoncashOrPartNoncashAdjustmentBetweenOtherNoncurrentAssetsAndOtherLongTermLiabilities_E6DA068DD9A94ED22F5375B59BFDF170_label_en-US" xlink:label="lab_core_NoncashOrPartNoncashAdjustmentBetweenOtherNoncurrentAssetsAndOtherLongTermLiabilities_E6DA068DD9A94ED22F5375B59BFDF170" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Noncash Or Part Noncash, Adjustment Between Other Noncurrent Assets And Other Long-Term Liabilities </link:label>

<link:label id="lab_core_NoncashOrPartNoncashAdjustmentBetweenOtherNoncurrentAssetsAndOtherLongTermLiabilities_E6DA068DD9A94ED22F5375B59BFDF170_documentation_en-US" xlink:label="lab_core_NoncashOrPartNoncashAdjustmentBetweenOtherNoncurrentAssetsAndOtherLongTermLiabilities_E6DA068DD9A94ED22F5375B59BFDF170" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Noncash Or Part Noncash, Adjustment Between Other Noncurrent Assets And Other Long-Term Liabilities </link:label>

<link:loc xlink:href="core-20191231.xsd#core_NoncashOrPartNoncashAdjustmentBetweenOtherNoncurrentAssetsAndOtherLongTermLiabilities" xlink:label="loc_core_NoncashOrPartNoncashAdjustmentBetweenOtherNoncurrentAssetsAndOtherLongTermLiabilities_E6DA068DD9A94ED22F5375B59BFDF170" xlink:type="locator"/>

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<link:label id="lab_us-gaap_EarningsPerShareTextBlock_0AA9F1B94E14CE98295075B59AB170D6_terseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareTextBlock_0AA9F1B94E14CE98295075B59AB170D6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Earnings Per Share </link:label>

<link:label id="lab_us-gaap_EarningsPerShareTextBlock_0AA9F1B94E14CE98295075B59AB170D6_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareTextBlock_0AA9F1B94E14CE98295075B59AB170D6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Earnings Per Share [Text Block] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareTextBlock" xlink:label="loc_us-gaap_EarningsPerShareTextBlock_0AA9F1B94E14CE98295075B59AB170D6" xlink:type="locator"/>

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<link:label id="lab_us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock_F191A6E77841F3377B9975B59BA1B978_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock_F191A6E77841F3377B9975B59BA1B978" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Assets Acquired and Liabilities Assumed </link:label>

<link:label id="lab_us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock_F191A6E77841F3377B9975B59BA1B978_label_en-US" xlink:label="lab_us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock_F191A6E77841F3377B9975B59BA1B978" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock_F191A6E77841F3377B9975B59BA1B978" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock_F191A6E77841F3377B9975B59BA1B978" xlink:to="lab_us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock_F191A6E77841F3377B9975B59BA1B978" xlink:type="arc"/>

<link:label id="lab_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetsByMajorClassTextBlock_8BB820E0648DA99B702675B59BA118A1_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetsByMajorClassTextBlock_8BB820E0648DA99B702675B59BA118A1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Intangible Assets Acquired </link:label>

<link:label id="lab_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetsByMajorClassTextBlock_8BB820E0648DA99B702675B59BA118A1_label_en-US" xlink:label="lab_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetsByMajorClassTextBlock_8BB820E0648DA99B702675B59BA118A1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetsByMajorClassTextBlock" xlink:label="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetsByMajorClassTextBlock_8BB820E0648DA99B702675B59BA118A1" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetsByMajorClassTextBlock_8BB820E0648DA99B702675B59BA118A1" xlink:to="lab_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetsByMajorClassTextBlock_8BB820E0648DA99B702675B59BA118A1" xlink:type="arc"/>

<link:label id="lab_us-gaap_BusinessAcquisitionProFormaInformationTextBlock_26C0D07D9D3E934E3FC875B59BA1EB8D_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionProFormaInformationTextBlock_26C0D07D9D3E934E3FC875B59BA1EB8D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Pro Forma Information </link:label>

<link:label id="lab_us-gaap_BusinessAcquisitionProFormaInformationTextBlock_26C0D07D9D3E934E3FC875B59BA1EB8D_label_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionProFormaInformationTextBlock_26C0D07D9D3E934E3FC875B59BA1EB8D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Business Acquisition, Pro Forma Information [Table Text Block] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessAcquisitionProFormaInformationTextBlock" xlink:label="loc_us-gaap_BusinessAcquisitionProFormaInformationTextBlock_26C0D07D9D3E934E3FC875B59BA1EB8D" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BusinessAcquisitionProFormaInformationTextBlock_26C0D07D9D3E934E3FC875B59BA1EB8D" xlink:to="lab_us-gaap_BusinessAcquisitionProFormaInformationTextBlock_26C0D07D9D3E934E3FC875B59BA1EB8D" xlink:type="arc"/>

<link:label id="lab_us-gaap_BusinessCombinationDisclosureTextBlock_3C986EBC56E460C2F4EB75B59BA492B7_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessCombinationDisclosureTextBlock_3C986EBC56E460C2F4EB75B59BA492B7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Acquisitions </link:label>

<link:label id="lab_us-gaap_BusinessCombinationDisclosureTextBlock_3C986EBC56E460C2F4EB75B59BA492B7_label_en-US" xlink:label="lab_us-gaap_BusinessCombinationDisclosureTextBlock_3C986EBC56E460C2F4EB75B59BA492B7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Business Combination Disclosure [Text Block] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationDisclosureTextBlock" xlink:label="loc_us-gaap_BusinessCombinationDisclosureTextBlock_3C986EBC56E460C2F4EB75B59BA492B7" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BusinessCombinationDisclosureTextBlock_3C986EBC56E460C2F4EB75B59BA492B7" xlink:to="lab_us-gaap_BusinessCombinationDisclosureTextBlock_3C986EBC56E460C2F4EB75B59BA492B7" xlink:type="arc"/>

<link:label id="lab_us-gaap_OfficeEquipmentMember_ED5FC74DD5B389CCCA5C75B59BC4F353_terseLabel_en-US" xlink:label="lab_us-gaap_OfficeEquipmentMember_ED5FC74DD5B389CCCA5C75B59BC4F353" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Office furniture and equipment </link:label>

<link:label id="lab_us-gaap_OfficeEquipmentMember_ED5FC74DD5B389CCCA5C75B59BC4F353_label_en-US" xlink:label="lab_us-gaap_OfficeEquipmentMember_ED5FC74DD5B389CCCA5C75B59BC4F353" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Office Equipment [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OfficeEquipmentMember" xlink:label="loc_us-gaap_OfficeEquipmentMember_ED5FC74DD5B389CCCA5C75B59BC4F353" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OfficeEquipmentMember_ED5FC74DD5B389CCCA5C75B59BC4F353" xlink:to="lab_us-gaap_OfficeEquipmentMember_ED5FC74DD5B389CCCA5C75B59BC4F353" xlink:type="arc"/>

<link:label id="lab_us-gaap_TransportationEquipmentMember_F30B667E12868FDB765A75B59BC4299D_terseLabel_en-US" xlink:label="lab_us-gaap_TransportationEquipmentMember_F30B667E12868FDB765A75B59BC4299D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Delivery equipment </link:label>

<link:label id="lab_us-gaap_TransportationEquipmentMember_F30B667E12868FDB765A75B59BC4299D_label_en-US" xlink:label="lab_us-gaap_TransportationEquipmentMember_F30B667E12868FDB765A75B59BC4299D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Transportation Equipment [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TransportationEquipmentMember" xlink:label="loc_us-gaap_TransportationEquipmentMember_F30B667E12868FDB765A75B59BC4299D" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_TransportationEquipmentMember_F30B667E12868FDB765A75B59BC4299D" xlink:to="lab_us-gaap_TransportationEquipmentMember_F30B667E12868FDB765A75B59BC4299D" xlink:type="arc"/>

<link:label id="lab_us-gaap_LeaseholdImprovementsMember_58FA37B854E74139E58175B59BC5FCFC_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseholdImprovementsMember_58FA37B854E74139E58175B59BC5FCFC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Leasehold improvements </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LeaseholdImprovementsMember" xlink:label="loc_us-gaap_LeaseholdImprovementsMember_58FA37B854E74139E58175B59BC5FCFC" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LeaseholdImprovementsMember_58FA37B854E74139E58175B59BC5FCFC" xlink:to="lab_us-gaap_LeaseholdImprovementsMember_58FA37B854E74139E58175B59BC5FCFC" xlink:type="arc"/>

<link:label id="lab_us-gaap_PropertyPlantAndEquipmentUsefulLife_76B4AF91F19B1993CA7A75B59BC6CD4D_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentUsefulLife_76B4AF91F19B1993CA7A75B59BC6CD4D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Fixed assets useful lives </link:label>

<link:label id="lab_us-gaap_PropertyPlantAndEquipmentUsefulLife_76B4AF91F19B1993CA7A75B59BC6CD4D_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentUsefulLife_76B4AF91F19B1993CA7A75B59BC6CD4D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment, Useful Life </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_76B4AF91F19B1993CA7A75B59BC6CD4D" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_76B4AF91F19B1993CA7A75B59BC6CD4D" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentUsefulLife_76B4AF91F19B1993CA7A75B59BC6CD4D" xlink:type="arc"/>

<link:label id="lab_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_CF6B05A9A00D81B8ABA775B59B2D7C1A_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_CF6B05A9A00D81B8ABA775B59B2D7C1A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Operating leases </link:label>

<link:label id="lab_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_CF6B05A9A00D81B8ABA775B59B2D7C1A_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_CF6B05A9A00D81B8ABA775B59B2D7C1A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Liability, Payment, Due [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract" xlink:label="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_CF6B05A9A00D81B8ABA775B59B2D7C1A" xlink:type="locator"/>

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<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_C71D1736603FFC3443AD75B59B2DD2F0_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_C71D1736603FFC3443AD75B59B2DD2F0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2020 </link:label>

<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_C71D1736603FFC3443AD75B59B2DD2F0_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_C71D1736603FFC3443AD75B59B2DD2F0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_C71D1736603FFC3443AD75B59B2DD2F0" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_C71D1736603FFC3443AD75B59B2DD2F0" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_C71D1736603FFC3443AD75B59B2DD2F0" xlink:type="arc"/>

<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_C0C946DCBF08DB3242A575B59B2D8A47_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_C0C946DCBF08DB3242A575B59B2D8A47" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2021 </link:label>

<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_C0C946DCBF08DB3242A575B59B2D8A47_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_C0C946DCBF08DB3242A575B59B2D8A47" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Liability, Payments, Due Year Two </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_C0C946DCBF08DB3242A575B59B2D8A47" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_C0C946DCBF08DB3242A575B59B2D8A47" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_C0C946DCBF08DB3242A575B59B2D8A47" xlink:type="arc"/>

<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_9E3DA95F0C62A1784EC475B59B2D15B5_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_9E3DA95F0C62A1784EC475B59B2D15B5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2022 </link:label>

<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_9E3DA95F0C62A1784EC475B59B2D15B5_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_9E3DA95F0C62A1784EC475B59B2D15B5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Liability, Payments, Due Year Three </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_9E3DA95F0C62A1784EC475B59B2D15B5" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_9E3DA95F0C62A1784EC475B59B2D15B5" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_9E3DA95F0C62A1784EC475B59B2D15B5" xlink:type="arc"/>

<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_EFFCEA0D0D105456B88175B59B2D6710_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_EFFCEA0D0D105456B88175B59B2D6710" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2023 </link:label>

<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_EFFCEA0D0D105456B88175B59B2D6710_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_EFFCEA0D0D105456B88175B59B2D6710" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Liability, Payments, Due Year Four </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_EFFCEA0D0D105456B88175B59B2D6710" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_EFFCEA0D0D105456B88175B59B2D6710" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_EFFCEA0D0D105456B88175B59B2D6710" xlink:type="arc"/>

<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_8F7AF2FBC3158B8E4BED75B59B2D500A_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_8F7AF2FBC3158B8E4BED75B59B2D500A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2024 </link:label>

<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_8F7AF2FBC3158B8E4BED75B59B2D500A_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_8F7AF2FBC3158B8E4BED75B59B2D500A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Liability, Payments, Due Year Five </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_8F7AF2FBC3158B8E4BED75B59B2D500A" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_8F7AF2FBC3158B8E4BED75B59B2D500A" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_8F7AF2FBC3158B8E4BED75B59B2D500A" xlink:type="arc"/>

<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_619A7D351FC3A55CF58A75B59B2E0B85_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_619A7D351FC3A55CF58A75B59B2E0B85" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2025 and thereafter </link:label>

<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_619A7D351FC3A55CF58A75B59B2E0B85_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_619A7D351FC3A55CF58A75B59B2E0B85" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Liability, Payments, Due after Year Five </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_619A7D351FC3A55CF58A75B59B2E0B85" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_619A7D351FC3A55CF58A75B59B2E0B85" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_619A7D351FC3A55CF58A75B59B2E0B85" xlink:type="arc"/>

<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_1DDCE9D8EB10D2E730DB75B59B2EC526_totalLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_1DDCE9D8EB10D2E730DB75B59B2EC526" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total lease payments </link:label>

<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_1DDCE9D8EB10D2E730DB75B59B2EC526_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_1DDCE9D8EB10D2E730DB75B59B2EC526" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Liability, Payments, Due </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_1DDCE9D8EB10D2E730DB75B59B2EC526" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_1DDCE9D8EB10D2E730DB75B59B2EC526" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_1DDCE9D8EB10D2E730DB75B59B2EC526" xlink:type="arc"/>

<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_95EE703115752440A6B675B59B2EA982_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_95EE703115752440A6B675B59B2EA982" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Less: interest </link:label>

<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_95EE703115752440A6B675B59B2EA982_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_95EE703115752440A6B675B59B2EA982" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Liability, Undiscounted Excess Amount </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_95EE703115752440A6B675B59B2EA982" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_95EE703115752440A6B675B59B2EA982" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_95EE703115752440A6B675B59B2EA982" xlink:type="arc"/>

<link:label id="lab_us-gaap_OperatingLeaseLiability_ED2857A8BC33C677BA0475B59B2E31A3_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiability_ED2857A8BC33C677BA0475B59B2E31A3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Present value of lease liabilities </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiability" xlink:label="loc_us-gaap_OperatingLeaseLiability_ED2857A8BC33C677BA0475B59B2E31A3" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseLiability_ED2857A8BC33C677BA0475B59B2E31A3" xlink:to="lab_us-gaap_OperatingLeaseLiability_ED2857A8BC33C677BA0475B59B2E31A3" xlink:type="arc"/>

<link:label id="lab_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_F681DD64D9C2DF67F79675B59B2E184F_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_F681DD64D9C2DF67F79675B59B2E184F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Finance leases </link:label>

<link:label id="lab_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_F681DD64D9C2DF67F79675B59B2E184F_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_F681DD64D9C2DF67F79675B59B2E184F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finance Lease, Liability, Payment, Due [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract" xlink:label="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_F681DD64D9C2DF67F79675B59B2E184F" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_F681DD64D9C2DF67F79675B59B2E184F" xlink:to="lab_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_F681DD64D9C2DF67F79675B59B2E184F" xlink:type="arc"/>

<link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths_0320581CA21B5EDF388E75B59B2F1609_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths_0320581CA21B5EDF388E75B59B2F1609" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2020 </link:label>

<link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths_0320581CA21B5EDF388E75B59B2F1609_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths_0320581CA21B5EDF388E75B59B2F1609" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finance Lease, Liability, Payments, Due Next Twelve Months </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths_0320581CA21B5EDF388E75B59B2F1609" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths_0320581CA21B5EDF388E75B59B2F1609" xlink:to="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths_0320581CA21B5EDF388E75B59B2F1609" xlink:type="arc"/>

<link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_7021E9059360F10485FC75B59B2FD79F_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_7021E9059360F10485FC75B59B2FD79F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2021 </link:label>

<link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_7021E9059360F10485FC75B59B2FD79F_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_7021E9059360F10485FC75B59B2FD79F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finance Lease, Liability, Payments, Due Year Two </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_7021E9059360F10485FC75B59B2FD79F" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_7021E9059360F10485FC75B59B2FD79F" xlink:to="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_7021E9059360F10485FC75B59B2FD79F" xlink:type="arc"/>

<link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_ADC12A6A5F8B32DA529175B59B2FEF03_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_ADC12A6A5F8B32DA529175B59B2FEF03" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2022 </link:label>

<link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_ADC12A6A5F8B32DA529175B59B2FEF03_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_ADC12A6A5F8B32DA529175B59B2FEF03" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finance Lease, Liability, Payments, Due Year Three </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_ADC12A6A5F8B32DA529175B59B2FEF03" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_ADC12A6A5F8B32DA529175B59B2FEF03" xlink:to="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_ADC12A6A5F8B32DA529175B59B2FEF03" xlink:type="arc"/>

<link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_4AF240DF03221462DEEF75B59B2FB38D_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_4AF240DF03221462DEEF75B59B2FB38D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2023 </link:label>

<link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_4AF240DF03221462DEEF75B59B2FB38D_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_4AF240DF03221462DEEF75B59B2FB38D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finance Lease, Liability, Payments, Due Year Four </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_4AF240DF03221462DEEF75B59B2FB38D" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_4AF240DF03221462DEEF75B59B2FB38D" xlink:to="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_4AF240DF03221462DEEF75B59B2FB38D" xlink:type="arc"/>

<link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_DA8800F43C54D027A07B75B59B2F74F8_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_DA8800F43C54D027A07B75B59B2F74F8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2024 </link:label>

<link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_DA8800F43C54D027A07B75B59B2F74F8_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_DA8800F43C54D027A07B75B59B2F74F8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finance Lease, Liability, Payments, Due Year Five </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_DA8800F43C54D027A07B75B59B2F74F8" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_DA8800F43C54D027A07B75B59B2F74F8" xlink:to="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_DA8800F43C54D027A07B75B59B2F74F8" xlink:type="arc"/>

<link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_ADCCDC4AB488785A73C375B59B2F66EC_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_ADCCDC4AB488785A73C375B59B2F66EC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2025 and thereafter </link:label>

<link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_ADCCDC4AB488785A73C375B59B2F66EC_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_ADCCDC4AB488785A73C375B59B2F66EC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finance Lease, Liability, Payments, Due after Year Five </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_ADCCDC4AB488785A73C375B59B2F66EC" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_ADCCDC4AB488785A73C375B59B2F66EC" xlink:to="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_ADCCDC4AB488785A73C375B59B2F66EC" xlink:type="arc"/>

<link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDue_31F63C13340993E2E87D75B59B302B8C_totalLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDue_31F63C13340993E2E87D75B59B302B8C" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total lease payments </link:label>

<link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDue_31F63C13340993E2E87D75B59B302B8C_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDue_31F63C13340993E2E87D75B59B302B8C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finance Lease, Liability, Payment, Due </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDue" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_31F63C13340993E2E87D75B59B302B8C" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_31F63C13340993E2E87D75B59B302B8C" xlink:to="lab_us-gaap_FinanceLeaseLiabilityPaymentsDue_31F63C13340993E2E87D75B59B302B8C" xlink:type="arc"/>

<link:label id="lab_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_360CBEE97B51D346112975B59B30B182_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_360CBEE97B51D346112975B59B30B182" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Less: interest </link:label>

<link:label id="lab_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_360CBEE97B51D346112975B59B30B182_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_360CBEE97B51D346112975B59B30B182" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finance Lease, Liability, Undiscounted Excess Amount </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount" xlink:label="loc_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_360CBEE97B51D346112975B59B30B182" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_360CBEE97B51D346112975B59B30B182" xlink:to="lab_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_360CBEE97B51D346112975B59B30B182" xlink:type="arc"/>

<link:label id="lab_us-gaap_FinanceLeaseLiability_4688939FF909AEBF77C075B59B304BAA_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiability_4688939FF909AEBF77C075B59B304BAA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Present value of lease liabilities </link:label>

<link:label id="lab_us-gaap_FinanceLeaseLiability_4688939FF909AEBF77C075B59B304BAA_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiability_4688939FF909AEBF77C075B59B304BAA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finance Lease, Liability </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiability" xlink:label="loc_us-gaap_FinanceLeaseLiability_4688939FF909AEBF77C075B59B304BAA" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiability_4688939FF909AEBF77C075B59B304BAA" xlink:to="lab_us-gaap_FinanceLeaseLiability_4688939FF909AEBF77C075B59B304BAA" xlink:type="arc"/>

<link:label id="lab_core_LesseeLeaseLiabilityPaymentsDueNext12Months_F99D4B1F13439E9A51FF75B59B300026_totalLabel_en-US" xlink:label="lab_core_LesseeLeaseLiabilityPaymentsDueNext12Months_F99D4B1F13439E9A51FF75B59B300026" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> 2020 </link:label>

<link:label id="lab_core_LesseeLeaseLiabilityPaymentsDueNext12Months_F99D4B1F13439E9A51FF75B59B300026_label_en-US" xlink:label="lab_core_LesseeLeaseLiabilityPaymentsDueNext12Months_F99D4B1F13439E9A51FF75B59B300026" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Lease, Liability, Payments, Due Next 12 Months </link:label>

<link:label id="lab_core_LesseeLeaseLiabilityPaymentsDueNext12Months_F99D4B1F13439E9A51FF75B59B300026_documentation_en-US" xlink:label="lab_core_LesseeLeaseLiabilityPaymentsDueNext12Months_F99D4B1F13439E9A51FF75B59B300026" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Lessee, Lease, Liability, Payments, Due Next 12 Months </link:label>

<link:loc xlink:href="core-20191231.xsd#core_LesseeLeaseLiabilityPaymentsDueNext12Months" xlink:label="loc_core_LesseeLeaseLiabilityPaymentsDueNext12Months_F99D4B1F13439E9A51FF75B59B300026" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_LesseeLeaseLiabilityPaymentsDueNext12Months_F99D4B1F13439E9A51FF75B59B300026" xlink:to="lab_core_LesseeLeaseLiabilityPaymentsDueNext12Months_F99D4B1F13439E9A51FF75B59B300026" xlink:type="arc"/>

<link:label id="lab_core_LesseeLeaseLiabilityPaymentsDueYearTwo_D3D4ADA0B0B95CD6623975B59B3032EE_totalLabel_en-US" xlink:label="lab_core_LesseeLeaseLiabilityPaymentsDueYearTwo_D3D4ADA0B0B95CD6623975B59B3032EE" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> 2021 </link:label>

<link:label id="lab_core_LesseeLeaseLiabilityPaymentsDueYearTwo_D3D4ADA0B0B95CD6623975B59B3032EE_label_en-US" xlink:label="lab_core_LesseeLeaseLiabilityPaymentsDueYearTwo_D3D4ADA0B0B95CD6623975B59B3032EE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Lease, Liability, Payments, Due Year Two </link:label>

<link:label id="lab_core_LesseeLeaseLiabilityPaymentsDueYearTwo_D3D4ADA0B0B95CD6623975B59B3032EE_documentation_en-US" xlink:label="lab_core_LesseeLeaseLiabilityPaymentsDueYearTwo_D3D4ADA0B0B95CD6623975B59B3032EE" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Lessee, Lease, Liability, Payments, Due Year Two </link:label>

<link:loc xlink:href="core-20191231.xsd#core_LesseeLeaseLiabilityPaymentsDueYearTwo" xlink:label="loc_core_LesseeLeaseLiabilityPaymentsDueYearTwo_D3D4ADA0B0B95CD6623975B59B3032EE" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_LesseeLeaseLiabilityPaymentsDueYearTwo_D3D4ADA0B0B95CD6623975B59B3032EE" xlink:to="lab_core_LesseeLeaseLiabilityPaymentsDueYearTwo_D3D4ADA0B0B95CD6623975B59B3032EE" xlink:type="arc"/>

<link:label id="lab_core_LesseeLeaseLiabilityPaymentsDueYearThree_0853B897968CA72AF76575B59B300F6F_totalLabel_en-US" xlink:label="lab_core_LesseeLeaseLiabilityPaymentsDueYearThree_0853B897968CA72AF76575B59B300F6F" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> 2022 </link:label>

<link:label id="lab_core_LesseeLeaseLiabilityPaymentsDueYearThree_0853B897968CA72AF76575B59B300F6F_label_en-US" xlink:label="lab_core_LesseeLeaseLiabilityPaymentsDueYearThree_0853B897968CA72AF76575B59B300F6F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Lease, Liability, Payments, Due Year Three </link:label>

<link:label id="lab_core_LesseeLeaseLiabilityPaymentsDueYearThree_0853B897968CA72AF76575B59B300F6F_documentation_en-US" xlink:label="lab_core_LesseeLeaseLiabilityPaymentsDueYearThree_0853B897968CA72AF76575B59B300F6F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Lessee, Lease, Liability, Payments, Due Year Three </link:label>

<link:loc xlink:href="core-20191231.xsd#core_LesseeLeaseLiabilityPaymentsDueYearThree" xlink:label="loc_core_LesseeLeaseLiabilityPaymentsDueYearThree_0853B897968CA72AF76575B59B300F6F" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_LesseeLeaseLiabilityPaymentsDueYearThree_0853B897968CA72AF76575B59B300F6F" xlink:to="lab_core_LesseeLeaseLiabilityPaymentsDueYearThree_0853B897968CA72AF76575B59B300F6F" xlink:type="arc"/>

<link:label id="lab_core_LesseeLeaseLiabilityPaymentsDueYearFour_98BB38CAAA934B0FAA4575B59B306E8C_totalLabel_en-US" xlink:label="lab_core_LesseeLeaseLiabilityPaymentsDueYearFour_98BB38CAAA934B0FAA4575B59B306E8C" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> 2023 </link:label>

<link:label id="lab_core_LesseeLeaseLiabilityPaymentsDueYearFour_98BB38CAAA934B0FAA4575B59B306E8C_label_en-US" xlink:label="lab_core_LesseeLeaseLiabilityPaymentsDueYearFour_98BB38CAAA934B0FAA4575B59B306E8C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Lease, Liability, Payments, Due Year Four </link:label>

<link:label id="lab_core_LesseeLeaseLiabilityPaymentsDueYearFour_98BB38CAAA934B0FAA4575B59B306E8C_documentation_en-US" xlink:label="lab_core_LesseeLeaseLiabilityPaymentsDueYearFour_98BB38CAAA934B0FAA4575B59B306E8C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Lessee, Lease, Liability, Payments, Due Year Four </link:label>

<link:loc xlink:href="core-20191231.xsd#core_LesseeLeaseLiabilityPaymentsDueYearFour" xlink:label="loc_core_LesseeLeaseLiabilityPaymentsDueYearFour_98BB38CAAA934B0FAA4575B59B306E8C" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_LesseeLeaseLiabilityPaymentsDueYearFour_98BB38CAAA934B0FAA4575B59B306E8C" xlink:to="lab_core_LesseeLeaseLiabilityPaymentsDueYearFour_98BB38CAAA934B0FAA4575B59B306E8C" xlink:type="arc"/>

<link:label id="lab_core_LesseeLeaseLiabilityPaymentsDueYearFive_2B46FB171709CDDA0CE675B59B317F1C_totalLabel_en-US" xlink:label="lab_core_LesseeLeaseLiabilityPaymentsDueYearFive_2B46FB171709CDDA0CE675B59B317F1C" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> 2024 </link:label>

<link:label id="lab_core_LesseeLeaseLiabilityPaymentsDueYearFive_2B46FB171709CDDA0CE675B59B317F1C_label_en-US" xlink:label="lab_core_LesseeLeaseLiabilityPaymentsDueYearFive_2B46FB171709CDDA0CE675B59B317F1C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Lease, Liability, Payments, Due Year Five </link:label>

<link:label id="lab_core_LesseeLeaseLiabilityPaymentsDueYearFive_2B46FB171709CDDA0CE675B59B317F1C_documentation_en-US" xlink:label="lab_core_LesseeLeaseLiabilityPaymentsDueYearFive_2B46FB171709CDDA0CE675B59B317F1C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Lessee, Lease, Liability, Payments, Due Year Five </link:label>

<link:loc xlink:href="core-20191231.xsd#core_LesseeLeaseLiabilityPaymentsDueYearFive" xlink:label="loc_core_LesseeLeaseLiabilityPaymentsDueYearFive_2B46FB171709CDDA0CE675B59B317F1C" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_LesseeLeaseLiabilityPaymentsDueYearFive_2B46FB171709CDDA0CE675B59B317F1C" xlink:to="lab_core_LesseeLeaseLiabilityPaymentsDueYearFive_2B46FB171709CDDA0CE675B59B317F1C" xlink:type="arc"/>

<link:label id="lab_core_LesseeLeaseLiabilityPaymentsDueAfterYearFive_6DE49DD871F0628AF07C75B59B31C454_totalLabel_en-US" xlink:label="lab_core_LesseeLeaseLiabilityPaymentsDueAfterYearFive_6DE49DD871F0628AF07C75B59B31C454" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> 2025 and thereafter </link:label>

<link:label id="lab_core_LesseeLeaseLiabilityPaymentsDueAfterYearFive_6DE49DD871F0628AF07C75B59B31C454_label_en-US" xlink:label="lab_core_LesseeLeaseLiabilityPaymentsDueAfterYearFive_6DE49DD871F0628AF07C75B59B31C454" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Lease, Liability, Payments, Due After Year Five </link:label>

<link:label id="lab_core_LesseeLeaseLiabilityPaymentsDueAfterYearFive_6DE49DD871F0628AF07C75B59B31C454_documentation_en-US" xlink:label="lab_core_LesseeLeaseLiabilityPaymentsDueAfterYearFive_6DE49DD871F0628AF07C75B59B31C454" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Lessee, Lease, Liability, Payments, Due After Year Five </link:label>

<link:loc xlink:href="core-20191231.xsd#core_LesseeLeaseLiabilityPaymentsDueAfterYearFive" xlink:label="loc_core_LesseeLeaseLiabilityPaymentsDueAfterYearFive_6DE49DD871F0628AF07C75B59B31C454" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_LesseeLeaseLiabilityPaymentsDueAfterYearFive_6DE49DD871F0628AF07C75B59B31C454" xlink:to="lab_core_LesseeLeaseLiabilityPaymentsDueAfterYearFive_6DE49DD871F0628AF07C75B59B31C454" xlink:type="arc"/>

<link:label id="lab_core_LesseeLeaseLiabilityPaymentsDue_E3B2A896B617FB7D463675B59B316E8D_totalLabel_en-US" xlink:label="lab_core_LesseeLeaseLiabilityPaymentsDue_E3B2A896B617FB7D463675B59B316E8D" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total lease payments </link:label>

<link:label id="lab_core_LesseeLeaseLiabilityPaymentsDue_E3B2A896B617FB7D463675B59B316E8D_label_en-US" xlink:label="lab_core_LesseeLeaseLiabilityPaymentsDue_E3B2A896B617FB7D463675B59B316E8D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Lease, Liability, Payments, Due </link:label>

<link:label id="lab_core_LesseeLeaseLiabilityPaymentsDue_E3B2A896B617FB7D463675B59B316E8D_documentation_en-US" xlink:label="lab_core_LesseeLeaseLiabilityPaymentsDue_E3B2A896B617FB7D463675B59B316E8D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Lessee, Lease, Liability, Payments, Due </link:label>

<link:loc xlink:href="core-20191231.xsd#core_LesseeLeaseLiabilityPaymentsDue" xlink:label="loc_core_LesseeLeaseLiabilityPaymentsDue_E3B2A896B617FB7D463675B59B316E8D" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_LesseeLeaseLiabilityPaymentsDue_E3B2A896B617FB7D463675B59B316E8D" xlink:to="lab_core_LesseeLeaseLiabilityPaymentsDue_E3B2A896B617FB7D463675B59B316E8D" xlink:type="arc"/>

<link:label id="lab_core_LesseeLeaseLiabilityUndiscountedExcessAmount_609D7F9F8CEF937752FF75B59B31A409_totalLabel_en-US" xlink:label="lab_core_LesseeLeaseLiabilityUndiscountedExcessAmount_609D7F9F8CEF937752FF75B59B31A409" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Less: interest </link:label>

<link:label id="lab_core_LesseeLeaseLiabilityUndiscountedExcessAmount_609D7F9F8CEF937752FF75B59B31A409_label_en-US" xlink:label="lab_core_LesseeLeaseLiabilityUndiscountedExcessAmount_609D7F9F8CEF937752FF75B59B31A409" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Lease, Liability, Undiscounted Excess Amount </link:label>

<link:label id="lab_core_LesseeLeaseLiabilityUndiscountedExcessAmount_609D7F9F8CEF937752FF75B59B31A409_documentation_en-US" xlink:label="lab_core_LesseeLeaseLiabilityUndiscountedExcessAmount_609D7F9F8CEF937752FF75B59B31A409" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Lessee, Lease, Liability, Undiscounted Excess Amount </link:label>

<link:loc xlink:href="core-20191231.xsd#core_LesseeLeaseLiabilityUndiscountedExcessAmount" xlink:label="loc_core_LesseeLeaseLiabilityUndiscountedExcessAmount_609D7F9F8CEF937752FF75B59B31A409" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_core_LesseeLeaseLiabilityUndiscountedExcessAmount_609D7F9F8CEF937752FF75B59B31A409" xlink:to="lab_core_LesseeLeaseLiabilityUndiscountedExcessAmount_609D7F9F8CEF937752FF75B59B31A409" xlink:type="arc"/>

<link:label id="lab_us-gaap_ConsolidationPolicyTextBlock_FBA6F4FBFC83F65A32FC75B59BDA8555_terseLabel_en-US" xlink:label="lab_us-gaap_ConsolidationPolicyTextBlock_FBA6F4FBFC83F65A32FC75B59BDA8555" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Basis of Presentation and Principles of Consolidation </link:label>

<link:label id="lab_us-gaap_ConsolidationPolicyTextBlock_FBA6F4FBFC83F65A32FC75B59BDA8555_label_en-US" xlink:label="lab_us-gaap_ConsolidationPolicyTextBlock_FBA6F4FBFC83F65A32FC75B59BDA8555" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Consolidation, Policy [Policy Text Block] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConsolidationPolicyTextBlock" xlink:label="loc_us-gaap_ConsolidationPolicyTextBlock_FBA6F4FBFC83F65A32FC75B59BDA8555" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ConsolidationPolicyTextBlock_FBA6F4FBFC83F65A32FC75B59BDA8555" xlink:to="lab_us-gaap_ConsolidationPolicyTextBlock_FBA6F4FBFC83F65A32FC75B59BDA8555" xlink:type="arc"/>

<link:label id="lab_us-gaap_UseOfEstimates_AB6805AB67371AA02E0775B59BDA405D_terseLabel_en-US" xlink:label="lab_us-gaap_UseOfEstimates_AB6805AB67371AA02E0775B59BDA405D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Use of Estimates </link:label>

<link:label id="lab_us-gaap_UseOfEstimates_AB6805AB67371AA02E0775B59BDA405D_label_en-US" xlink:label="lab_us-gaap_UseOfEstimates_AB6805AB67371AA02E0775B59BDA405D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Use of Estimates, Policy [Policy Text Block] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_UseOfEstimates" xlink:label="loc_us-gaap_UseOfEstimates_AB6805AB67371AA02E0775B59BDA405D" xlink:type="locator"/>

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<link:label id="lab_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_B4272885A86EE6E0EC0F75B59BDA52AB_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_B4272885A86EE6E0EC0F75B59BDA52AB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Stock-based Compensation </link:label>

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<link:label id="lab_us-gaap_PensionAndOtherPostretirementPlansPolicy_FFA2E8C16C4B4314242175B59BDB4FBB_terseLabel_en-US" xlink:label="lab_us-gaap_PensionAndOtherPostretirementPlansPolicy_FFA2E8C16C4B4314242175B59BDB4FBB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Pension and Other Post-retirement Benefit Costs </link:label>

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<link:label id="lab_us-gaap_CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy_9B4B8CEEC4CBC92A7FEE75B59BDBE5A4_terseLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy_9B4B8CEEC4CBC92A7FEE75B59BDBE5A4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cash, Cash Equivalents, Restricted Cash and Book Overdrafts </link:label>

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<link:label id="lab_us-gaap_TradeAndOtherAccountsReceivablePolicy_BBA46A573C3E0EFA4D3075B59BDB9AA5_terseLabel_en-US" xlink:label="lab_us-gaap_TradeAndOtherAccountsReceivablePolicy_BBA46A573C3E0EFA4D3075B59BDB9AA5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accounts Receivable and Allowance for Doubtful Accounts and Other Receivables </link:label>

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<link:label id="lab_us-gaap_InventoryPolicyTextBlock_E8F808979B55CC94EC1875B59BDBCD89_terseLabel_en-US" xlink:label="lab_us-gaap_InventoryPolicyTextBlock_E8F808979B55CC94EC1875B59BDBCD89" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Inventories </link:label>

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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InventoryPolicyTextBlock" xlink:label="loc_us-gaap_InventoryPolicyTextBlock_E8F808979B55CC94EC1875B59BDBCD89" xlink:type="locator"/>

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<link:label id="lab_us-gaap_FairValueMeasurementPolicyPolicyTextBlock_1DA05F96246A892AEABB75B59BDC9346_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueMeasurementPolicyPolicyTextBlock_1DA05F96246A892AEABB75B59BDC9346" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Fair Value Measurements </link:label>

<link:label id="lab_us-gaap_FairValueMeasurementPolicyPolicyTextBlock_1DA05F96246A892AEABB75B59BDC9346_label_en-US" xlink:label="lab_us-gaap_FairValueMeasurementPolicyPolicyTextBlock_1DA05F96246A892AEABB75B59BDC9346" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Fair Value Measurement, Policy [Policy Text Block] </link:label>

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<link:label id="lab_us-gaap_BusinessCombinationsPolicy_6EFC02736C9909E6D03275B59BDC17A9_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessCombinationsPolicy_6EFC02736C9909E6D03275B59BDC17A9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Business Combinations </link:label>

<link:label id="lab_us-gaap_BusinessCombinationsPolicy_6EFC02736C9909E6D03275B59BDC17A9_label_en-US" xlink:label="lab_us-gaap_BusinessCombinationsPolicy_6EFC02736C9909E6D03275B59BDC17A9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Business Combinations Policy [Policy Text Block] </link:label>

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<link:label id="lab_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_F9D0DD92986CBDB7057675B59BDCB10A_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_F9D0DD92986CBDB7057675B59BDCB10A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Property and Equipment </link:label>

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<link:label id="lab_us-gaap_IntangibleAssetsFiniteLivedPolicy_02D6F40C5DE09718434A75B59BDC2F2E_terseLabel_en-US" xlink:label="lab_us-gaap_IntangibleAssetsFiniteLivedPolicy_02D6F40C5DE09718434A75B59BDC2F2E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other Long-lived Assets </link:label>

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<link:label id="lab_us-gaap_GoodwillAndIntangibleAssetsGoodwillPolicy_6B31A580DE4F651FDF2175B59BDCC45B_terseLabel_en-US" xlink:label="lab_us-gaap_GoodwillAndIntangibleAssetsGoodwillPolicy_6B31A580DE4F651FDF2175B59BDCC45B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Goodwill </link:label>

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<link:label id="lab_us-gaap_InternalUseSoftwarePolicy_7542221ABEAA4C1C4A6E75B59BDC715D_terseLabel_en-US" xlink:label="lab_us-gaap_InternalUseSoftwarePolicy_7542221ABEAA4C1C4A6E75B59BDC715D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Computer Software Developed or Obtained for Internal Use </link:label>

<link:label id="lab_us-gaap_InternalUseSoftwarePolicy_7542221ABEAA4C1C4A6E75B59BDC715D_label_en-US" xlink:label="lab_us-gaap_InternalUseSoftwarePolicy_7542221ABEAA4C1C4A6E75B59BDC715D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Internal Use Software, Policy [Policy Text Block] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InternalUseSoftwarePolicy" xlink:label="loc_us-gaap_InternalUseSoftwarePolicy_7542221ABEAA4C1C4A6E75B59BDC715D" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InternalUseSoftwarePolicy_7542221ABEAA4C1C4A6E75B59BDC715D" xlink:to="lab_us-gaap_InternalUseSoftwarePolicy_7542221ABEAA4C1C4A6E75B59BDC715D" xlink:type="arc"/>

<link:label id="lab_us-gaap_ContingentLiabilityReserveEstimatePolicy_48821983958A08BB41E075B59BDDEDFF_terseLabel_en-US" xlink:label="lab_us-gaap_ContingentLiabilityReserveEstimatePolicy_48821983958A08BB41E075B59BDDEDFF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Claims Liabilities and Insurance Recoverables </link:label>

<link:label id="lab_us-gaap_ContingentLiabilityReserveEstimatePolicy_48821983958A08BB41E075B59BDDEDFF_label_en-US" xlink:label="lab_us-gaap_ContingentLiabilityReserveEstimatePolicy_48821983958A08BB41E075B59BDDEDFF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Contingent Liability Reserve Estimate, Policy [Policy Text Block] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContingentLiabilityReserveEstimatePolicy" xlink:label="loc_us-gaap_ContingentLiabilityReserveEstimatePolicy_48821983958A08BB41E075B59BDDEDFF" xlink:type="locator"/>

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<link:label id="lab_us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_5C406DB3B74499AC868B75B59BDD2EB0_terseLabel_en-US" xlink:label="lab_us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_5C406DB3B74499AC868B75B59BDD2EB0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Foreign Currency Translation </link:label>

<link:label id="lab_us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_5C406DB3B74499AC868B75B59BDD2EB0_label_en-US" xlink:label="lab_us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_5C406DB3B74499AC868B75B59BDD2EB0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Foreign Currency Transactions and Translations Policy [Policy Text Block] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock" xlink:label="loc_us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_5C406DB3B74499AC868B75B59BDD2EB0" xlink:type="locator"/>

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<link:label id="lab_us-gaap_ConcentrationRiskCreditRisk_3A3FB4C4FB93E6C06FA275B59BDDC7C1_terseLabel_en-US" xlink:label="lab_us-gaap_ConcentrationRiskCreditRisk_3A3FB4C4FB93E6C06FA275B59BDDC7C1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Risks and Concentrations </link:label>

<link:label id="lab_us-gaap_ConcentrationRiskCreditRisk_3A3FB4C4FB93E6C06FA275B59BDDC7C1_label_en-US" xlink:label="lab_us-gaap_ConcentrationRiskCreditRisk_3A3FB4C4FB93E6C06FA275B59BDDC7C1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Concentration Risk, Credit Risk, Policy [Policy Text Block] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskCreditRisk" xlink:label="loc_us-gaap_ConcentrationRiskCreditRisk_3A3FB4C4FB93E6C06FA275B59BDDC7C1" xlink:type="locator"/>

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<link:label id="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_8CA66424A360C33055CE75B59BDDD597_terseLabel_en-US" xlink:label="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_8CA66424A360C33055CE75B59BDDD597" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Adoption of Accounting Pronouncements and Recent Accounting Standards or Updates Not Yet Effective </link:label>

<link:label id="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_8CA66424A360C33055CE75B59BDDD597_label_en-US" xlink:label="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_8CA66424A360C33055CE75B59BDDD597" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> New Accounting Pronouncements, Policy [Policy Text Block] </link:label>

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<link:label id="lab_us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock_EB43FBB59AD0A117A4B675B59B5DB7B5_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock_EB43FBB59AD0A117A4B675B59B5DB7B5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Property and Equipment, Net </link:label>

<link:label id="lab_us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock_EB43FBB59AD0A117A4B675B59B5DB7B5_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock_EB43FBB59AD0A117A4B675B59B5DB7B5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment Disclosure [Text Block] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock_EB43FBB59AD0A117A4B675B59B5DB7B5" xlink:type="locator"/>

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<link:label id="lab_core_ManagementServiceFeeRevenueAsPercentageOfTotalNetSalesMaximum_4EF0694D63D66ACEB8CD8D50EA7883A3_terseLabel_en-US" xlink:label="lab_core_ManagementServiceFeeRevenueAsPercentageOfTotalNetSalesMaximum_4EF0694D63D66ACEB8CD8D50EA7883A3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Management service fee revenue as a percentage of total net sales, less than 1% </link:label>

<link:label id="lab_core_ManagementServiceFeeRevenueAsPercentageOfTotalNetSalesMaximum_4EF0694D63D66ACEB8CD8D50EA7883A3_label_en-US" xlink:label="lab_core_ManagementServiceFeeRevenueAsPercentageOfTotalNetSalesMaximum_4EF0694D63D66ACEB8CD8D50EA7883A3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Management Service Fee Revenue as a Percentage of Total Net Sales, Maximum </link:label>

<link:label id="lab_core_ManagementServiceFeeRevenueAsPercentageOfTotalNetSalesMaximum_4EF0694D63D66ACEB8CD8D50EA7883A3_documentation_en-US" xlink:label="lab_core_ManagementServiceFeeRevenueAsPercentageOfTotalNetSalesMaximum_4EF0694D63D66ACEB8CD8D50EA7883A3" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Management Service Fee Revenue as a Percentage of Total Net Sales, Maximum </link:label>

<link:loc xlink:href="core-20191231.xsd#core_ManagementServiceFeeRevenueAsPercentageOfTotalNetSalesMaximum" xlink:label="loc_core_ManagementServiceFeeRevenueAsPercentageOfTotalNetSalesMaximum_4EF0694D63D66ACEB8CD8D50EA7883A3" xlink:type="locator"/>

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<link:label id="lab_core_VendorRebatesAndPromotionalAllowances_B2660FDBE3A3B8BCE59F8D50EA7831FC_terseLabel_en-US" xlink:label="lab_core_VendorRebatesAndPromotionalAllowances_B2660FDBE3A3B8BCE59F8D50EA7831FC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Vendor rebates and promotional allowances </link:label>

<link:label id="lab_core_VendorRebatesAndPromotionalAllowances_B2660FDBE3A3B8BCE59F8D50EA7831FC_label_en-US" xlink:label="lab_core_VendorRebatesAndPromotionalAllowances_B2660FDBE3A3B8BCE59F8D50EA7831FC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Vendor Rebates and Promotional Allowances </link:label>

<link:label id="lab_core_VendorRebatesAndPromotionalAllowances_B2660FDBE3A3B8BCE59F8D50EA7831FC_documentation_en-US" xlink:label="lab_core_VendorRebatesAndPromotionalAllowances_B2660FDBE3A3B8BCE59F8D50EA7831FC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Vendor Rebates and Promotional Allowances </link:label>

<link:loc xlink:href="core-20191231.xsd#core_VendorRebatesAndPromotionalAllowances" xlink:label="loc_core_VendorRebatesAndPromotionalAllowances_B2660FDBE3A3B8BCE59F8D50EA7831FC" xlink:type="locator"/>

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<link:label id="lab_core_ExciseTaxesAsPercentageOfNetSales_7C9C45BE813A33D5AC678D50EA79CF9A_terseLabel_en-US" xlink:label="lab_core_ExciseTaxesAsPercentageOfNetSales_7C9C45BE813A33D5AC678D50EA79CF9A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Excise taxes as a percentage of net sales </link:label>

<link:label id="lab_core_ExciseTaxesAsPercentageOfNetSales_7C9C45BE813A33D5AC678D50EA79CF9A_label_en-US" xlink:label="lab_core_ExciseTaxesAsPercentageOfNetSales_7C9C45BE813A33D5AC678D50EA79CF9A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Excise Taxes as a Percentage of Net Sales </link:label>

<link:label id="lab_core_ExciseTaxesAsPercentageOfNetSales_7C9C45BE813A33D5AC678D50EA79CF9A_documentation_en-US" xlink:label="lab_core_ExciseTaxesAsPercentageOfNetSales_7C9C45BE813A33D5AC678D50EA79CF9A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Excise Taxes as a Percentage of Net Sales </link:label>

<link:loc xlink:href="core-20191231.xsd#core_ExciseTaxesAsPercentageOfNetSales" xlink:label="loc_core_ExciseTaxesAsPercentageOfNetSales_7C9C45BE813A33D5AC678D50EA79CF9A" xlink:type="locator"/>

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<link:label id="lab_core_ExciseTaxesAsPercentageOfCostOfGoodsSold_686450E87AAACB61572A8D50EA797C95_terseLabel_en-US" xlink:label="lab_core_ExciseTaxesAsPercentageOfCostOfGoodsSold_686450E87AAACB61572A8D50EA797C95" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Excise taxes as a percentage of cost of goods sold </link:label>

<link:label id="lab_core_ExciseTaxesAsPercentageOfCostOfGoodsSold_686450E87AAACB61572A8D50EA797C95_label_en-US" xlink:label="lab_core_ExciseTaxesAsPercentageOfCostOfGoodsSold_686450E87AAACB61572A8D50EA797C95" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Excise Taxes as a Percentage of Cost of Goods Sold </link:label>

<link:label id="lab_core_ExciseTaxesAsPercentageOfCostOfGoodsSold_686450E87AAACB61572A8D50EA797C95_documentation_en-US" xlink:label="lab_core_ExciseTaxesAsPercentageOfCostOfGoodsSold_686450E87AAACB61572A8D50EA797C95" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Excise Taxes as a Percentage of Cost of Goods Sold </link:label>

<link:loc xlink:href="core-20191231.xsd#core_ExciseTaxesAsPercentageOfCostOfGoodsSold" xlink:label="loc_core_ExciseTaxesAsPercentageOfCostOfGoodsSold_686450E87AAACB61572A8D50EA797C95" xlink:type="locator"/>

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<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_245A5427D34F6111B6A07B2AE214A5FB_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_245A5427D34F6111B6A07B2AE214A5FB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Operating Leases, Before Adoption of 842: </link:label>

<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_245A5427D34F6111B6A07B2AE214A5FB_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_245A5427D34F6111B6A07B2AE214A5FB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract_245A5427D34F6111B6A07B2AE214A5FB" xlink:type="locator"/>

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<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_B6BC4739D306FE3091AB7B2AE215CE5C_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_B6BC4739D306FE3091AB7B2AE215CE5C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2019 </link:label>

<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_B6BC4739D306FE3091AB7B2AE215CE5C_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_B6BC4739D306FE3091AB7B2AE215CE5C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Leases, Future Minimum Payments Due, Next Twelve Months </link:label>

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<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_815CE7475748854FB9F97B2AE2155547_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_815CE7475748854FB9F97B2AE2155547" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2020 </link:label>

<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_815CE7475748854FB9F97B2AE2155547_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_815CE7475748854FB9F97B2AE2155547" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Leases, Future Minimum Payments, Due in Two Years </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_815CE7475748854FB9F97B2AE2155547" xlink:type="locator"/>

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<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_38E0F8985CB704AC87827B2AE215D951_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_38E0F8985CB704AC87827B2AE215D951" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2021 </link:label>

<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_38E0F8985CB704AC87827B2AE215D951_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_38E0F8985CB704AC87827B2AE215D951" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Leases, Future Minimum Payments, Due in Three Years </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_38E0F8985CB704AC87827B2AE215D951" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_38E0F8985CB704AC87827B2AE215D951" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_38E0F8985CB704AC87827B2AE215D951" xlink:type="arc"/>

<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_FFCDCFC5F3ED0214EA0C7B2AE215997B_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_FFCDCFC5F3ED0214EA0C7B2AE215997B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2022 </link:label>

<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_FFCDCFC5F3ED0214EA0C7B2AE215997B_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_FFCDCFC5F3ED0214EA0C7B2AE215997B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Leases, Future Minimum Payments, Due in Four Years </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_FFCDCFC5F3ED0214EA0C7B2AE215997B" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_FFCDCFC5F3ED0214EA0C7B2AE215997B" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_FFCDCFC5F3ED0214EA0C7B2AE215997B" xlink:type="arc"/>

<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_F3E89E2E0F88DB36BB1D7B2AE215D178_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_F3E89E2E0F88DB36BB1D7B2AE215D178" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2023 </link:label>

<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_F3E89E2E0F88DB36BB1D7B2AE215D178_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_F3E89E2E0F88DB36BB1D7B2AE215D178" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Leases, Future Minimum Payments, Due in Five Years </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_F3E89E2E0F88DB36BB1D7B2AE215D178" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_F3E89E2E0F88DB36BB1D7B2AE215D178" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_F3E89E2E0F88DB36BB1D7B2AE215D178" xlink:type="arc"/>

<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_0BE88B278E8DBFD50A927B2AE216836A_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_0BE88B278E8DBFD50A927B2AE216836A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2024 and Thereafter </link:label>

<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_0BE88B278E8DBFD50A927B2AE216836A_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_0BE88B278E8DBFD50A927B2AE216836A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Leases, Future Minimum Payments, Due Thereafter </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_0BE88B278E8DBFD50A927B2AE216836A" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_0BE88B278E8DBFD50A927B2AE216836A" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_0BE88B278E8DBFD50A927B2AE216836A" xlink:type="arc"/>

<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_3A576878EF2E49A5F17A7B2AE21619B7_totalLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_3A576878EF2E49A5F17A7B2AE21619B7" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total </link:label>

<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_3A576878EF2E49A5F17A7B2AE21619B7_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_3A576878EF2E49A5F17A7B2AE21619B7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Leases, Future Minimum Payments Due </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDue" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_3A576878EF2E49A5F17A7B2AE21619B7" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_3A576878EF2E49A5F17A7B2AE21619B7" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_3A576878EF2E49A5F17A7B2AE21619B7" xlink:type="arc"/>

<link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueAbstract_529C3A1ADD1448B226547B2AE216FBD9_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueAbstract_529C3A1ADD1448B226547B2AE216FBD9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Capital Leases, Before Adoption of 842: </link:label>

<link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueAbstract_529C3A1ADD1448B226547B2AE216FBD9_label_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueAbstract_529C3A1ADD1448B226547B2AE216FBD9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDueAbstract" xlink:label="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueAbstract_529C3A1ADD1448B226547B2AE216FBD9" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueAbstract_529C3A1ADD1448B226547B2AE216FBD9" xlink:to="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueAbstract_529C3A1ADD1448B226547B2AE216FBD9" xlink:type="arc"/>

<link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent_191A618C1875E196262E7B2AE216BC85_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent_191A618C1875E196262E7B2AE216BC85" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2019 </link:label>

<link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent_191A618C1875E196262E7B2AE216BC85_label_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent_191A618C1875E196262E7B2AE216BC85" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Capital Leases, Future Minimum Payments Due, Next Twelve Months </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent" xlink:label="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent_191A618C1875E196262E7B2AE216BC85" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent_191A618C1875E196262E7B2AE216BC85" xlink:to="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent_191A618C1875E196262E7B2AE216BC85" xlink:type="arc"/>

<link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears_E771BDD0522DEB3253B47B2AE2160414_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears_E771BDD0522DEB3253B47B2AE2160414" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2020 </link:label>

<link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears_E771BDD0522DEB3253B47B2AE2160414_label_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears_E771BDD0522DEB3253B47B2AE2160414" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Capital Leases, Future Minimum Payments Due in Two Years </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears" xlink:label="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears_E771BDD0522DEB3253B47B2AE2160414" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears_E771BDD0522DEB3253B47B2AE2160414" xlink:to="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears_E771BDD0522DEB3253B47B2AE2160414" xlink:type="arc"/>

<link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears_868308D3D5F87224C8197B2AE2168A37_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears_868308D3D5F87224C8197B2AE2168A37" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2021 </link:label>

<link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears_868308D3D5F87224C8197B2AE2168A37_label_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears_868308D3D5F87224C8197B2AE2168A37" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Capital Leases, Future Minimum Payments Due in Three Years </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears" xlink:label="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears_868308D3D5F87224C8197B2AE2168A37" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears_868308D3D5F87224C8197B2AE2168A37" xlink:to="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears_868308D3D5F87224C8197B2AE2168A37" xlink:type="arc"/>

<link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears_053312FCA16903F1CDA47B2AE217CDE1_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears_053312FCA16903F1CDA47B2AE217CDE1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2022 </link:label>

<link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears_053312FCA16903F1CDA47B2AE217CDE1_label_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears_053312FCA16903F1CDA47B2AE217CDE1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Capital Leases, Future Minimum Payments Due in Four Years </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears" xlink:label="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears_053312FCA16903F1CDA47B2AE217CDE1" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears_053312FCA16903F1CDA47B2AE217CDE1" xlink:to="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears_053312FCA16903F1CDA47B2AE217CDE1" xlink:type="arc"/>

<link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears_6A5CF23EC89FFBB923927B2AE217BB28_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears_6A5CF23EC89FFBB923927B2AE217BB28" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2023 </link:label>

<link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears_6A5CF23EC89FFBB923927B2AE217BB28_label_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears_6A5CF23EC89FFBB923927B2AE217BB28" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Capital Leases, Future Minimum Payments Due in Five Years </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears" xlink:label="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears_6A5CF23EC89FFBB923927B2AE217BB28" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears_6A5CF23EC89FFBB923927B2AE217BB28" xlink:to="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears_6A5CF23EC89FFBB923927B2AE217BB28" xlink:type="arc"/>

<link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter_9BB1EADFDE82630B7D137B2AE217C164_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter_9BB1EADFDE82630B7D137B2AE217C164" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2024 and thereafter </link:label>

<link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter_9BB1EADFDE82630B7D137B2AE217C164_label_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter_9BB1EADFDE82630B7D137B2AE217C164" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Capital Leases, Future Minimum Payments Due Thereafter </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter" xlink:label="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter_9BB1EADFDE82630B7D137B2AE217C164" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter_9BB1EADFDE82630B7D137B2AE217C164" xlink:to="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter_9BB1EADFDE82630B7D137B2AE217C164" xlink:type="arc"/>

<link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDue_6E0EA43087ED42D662F37B2AE21763FF_totalLabel_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDue_6E0EA43087ED42D662F37B2AE21763FF" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total </link:label>

<link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDue_6E0EA43087ED42D662F37B2AE21763FF_label_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDue_6E0EA43087ED42D662F37B2AE21763FF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Capital Leases, Future Minimum Payments Due </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsDue" xlink:label="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDue_6E0EA43087ED42D662F37B2AE21763FF" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsDue_6E0EA43087ED42D662F37B2AE21763FF" xlink:to="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsDue_6E0EA43087ED42D662F37B2AE21763FF" xlink:type="arc"/>

<link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments_1EC7301F6EAE2422AA8C7B2AE217AA07_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments_1EC7301F6EAE2422AA8C7B2AE217AA07" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Less: interest </link:label>

<link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments_1EC7301F6EAE2422AA8C7B2AE217AA07_label_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments_1EC7301F6EAE2422AA8C7B2AE217AA07" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Capital Leases, Future Minimum Payments, Interest Included in Payments </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments" xlink:label="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments_1EC7301F6EAE2422AA8C7B2AE217AA07" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments_1EC7301F6EAE2422AA8C7B2AE217AA07" xlink:to="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments_1EC7301F6EAE2422AA8C7B2AE217AA07" xlink:type="arc"/>

<link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments_1778B7C386008BC8F0E37B2AE21748C1_totalLabel_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments_1778B7C386008BC8F0E37B2AE21748C1" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Present value of future minimum lease payments </link:label>

<link:label id="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments_1778B7C386008BC8F0E37B2AE21748C1_label_en-US" xlink:label="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments_1778B7C386008BC8F0E37B2AE21748C1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments" xlink:label="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments_1778B7C386008BC8F0E37B2AE21748C1" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments_1778B7C386008BC8F0E37B2AE21748C1" xlink:to="lab_us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments_1778B7C386008BC8F0E37B2AE21748C1" xlink:type="arc"/>

<link:label id="lab_us-gaap_CapitalLeaseObligationsCurrent_0D50DCC6BD7C7028BBFB7B2AE218D5C6_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeaseObligationsCurrent_0D50DCC6BD7C7028BBFB7B2AE218D5C6" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Less: current portion </link:label>

<link:label id="lab_us-gaap_CapitalLeaseObligationsCurrent_0D50DCC6BD7C7028BBFB7B2AE218D5C6_label_en-US" xlink:label="lab_us-gaap_CapitalLeaseObligationsCurrent_0D50DCC6BD7C7028BBFB7B2AE218D5C6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Capital Lease Obligations, Current </link:label>

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<link:label id="lab_us-gaap_CapitalLeaseObligationsNoncurrent_53AC2A401799E810F4457B2AE2189554_terseLabel_en-US" xlink:label="lab_us-gaap_CapitalLeaseObligationsNoncurrent_53AC2A401799E810F4457B2AE2189554" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Non-current portion </link:label>

<link:label id="lab_us-gaap_CapitalLeaseObligationsNoncurrent_53AC2A401799E810F4457B2AE2189554_label_en-US" xlink:label="lab_us-gaap_CapitalLeaseObligationsNoncurrent_53AC2A401799E810F4457B2AE2189554" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Capital Lease Obligations, Noncurrent </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalLeaseObligationsNoncurrent" xlink:label="loc_us-gaap_CapitalLeaseObligationsNoncurrent_53AC2A401799E810F4457B2AE2189554" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CapitalLeaseObligationsNoncurrent_53AC2A401799E810F4457B2AE2189554" xlink:to="lab_us-gaap_CapitalLeaseObligationsNoncurrent_53AC2A401799E810F4457B2AE2189554" xlink:type="arc"/>

<link:label id="lab_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_A9FB26EE0D2FB58957BA75B59AB6708F_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_A9FB26EE0D2FB58957BA75B59AB6708F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Defined Benefit Plans Disclosures [Table] </link:label>

<link:label id="lab_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_A9FB26EE0D2FB58957BA75B59AB6708F_label_en-US" xlink:label="lab_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_A9FB26EE0D2FB58957BA75B59AB6708F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Defined Benefit Plans Disclosures [Table] </link:label>

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<link:label id="lab_us-gaap_RetirementPlanTypeAxis_9E7D845FDD5DA3DA424D75B59AB656BD_terseLabel_en-US" xlink:label="lab_us-gaap_RetirementPlanTypeAxis_9E7D845FDD5DA3DA424D75B59AB656BD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Retirement Plan Type [Axis] </link:label>

<link:label id="lab_us-gaap_RetirementPlanTypeAxis_9E7D845FDD5DA3DA424D75B59AB656BD_label_en-US" xlink:label="lab_us-gaap_RetirementPlanTypeAxis_9E7D845FDD5DA3DA424D75B59AB656BD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Retirement Plan Type [Axis] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeAxis" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_9E7D845FDD5DA3DA424D75B59AB656BD" xlink:type="locator"/>

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<link:label id="lab_us-gaap_RetirementPlanTypeDomain_26FC02F24BFE25FB424B75B59AB66B97_terseLabel_en-US" xlink:label="lab_us-gaap_RetirementPlanTypeDomain_26FC02F24BFE25FB424B75B59AB66B97" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Retirement Plan Type [Domain] </link:label>

<link:label id="lab_us-gaap_RetirementPlanTypeDomain_26FC02F24BFE25FB424B75B59AB66B97_label_en-US" xlink:label="lab_us-gaap_RetirementPlanTypeDomain_26FC02F24BFE25FB424B75B59AB66B97" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Retirement Plan Type [Domain] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_26FC02F24BFE25FB424B75B59AB66B97" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_26FC02F24BFE25FB424B75B59AB66B97" xlink:to="lab_us-gaap_RetirementPlanTypeDomain_26FC02F24BFE25FB424B75B59AB66B97" xlink:type="arc"/>

<link:label id="lab_us-gaap_PensionPlansDefinedBenefitMember_2FCF36300345E1F23BD675B59AB7B0D5_terseLabel_en-US" xlink:label="lab_us-gaap_PensionPlansDefinedBenefitMember_2FCF36300345E1F23BD675B59AB7B0D5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Pension Benefits </link:label>

<link:label id="lab_us-gaap_PensionPlansDefinedBenefitMember_2FCF36300345E1F23BD675B59AB7B0D5_label_en-US" xlink:label="lab_us-gaap_PensionPlansDefinedBenefitMember_2FCF36300345E1F23BD675B59AB7B0D5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Pension Plan [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_2FCF36300345E1F23BD675B59AB7B0D5" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PensionPlansDefinedBenefitMember_2FCF36300345E1F23BD675B59AB7B0D5" xlink:to="lab_us-gaap_PensionPlansDefinedBenefitMember_2FCF36300345E1F23BD675B59AB7B0D5" xlink:type="arc"/>

<link:label id="lab_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_25CA7C86A6F62D12141775B59AB7878A_terseLabel_en-US" xlink:label="lab_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_25CA7C86A6F62D12141775B59AB7878A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other Post-retirement Benefits </link:label>

<link:label id="lab_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_25CA7C86A6F62D12141775B59AB7878A_label_en-US" xlink:label="lab_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_25CA7C86A6F62D12141775B59AB7878A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Postretirement Benefits Plan [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_25CA7C86A6F62D12141775B59AB7878A" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_25CA7C86A6F62D12141775B59AB7878A" xlink:to="lab_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_25CA7C86A6F62D12141775B59AB7878A" xlink:type="arc"/>

<link:label id="lab_us-gaap_RetirementPlanSponsorLocationAxis_7743F0C46339EE3E703B75B59AB73217_terseLabel_en-US" xlink:label="lab_us-gaap_RetirementPlanSponsorLocationAxis_7743F0C46339EE3E703B75B59AB73217" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Retirement Plan Sponsor Location [Axis] </link:label>

<link:label id="lab_us-gaap_RetirementPlanSponsorLocationAxis_7743F0C46339EE3E703B75B59AB73217_label_en-US" xlink:label="lab_us-gaap_RetirementPlanSponsorLocationAxis_7743F0C46339EE3E703B75B59AB73217" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Retirement Plan Sponsor Location [Axis] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanSponsorLocationAxis" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_7743F0C46339EE3E703B75B59AB73217" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_7743F0C46339EE3E703B75B59AB73217" xlink:to="lab_us-gaap_RetirementPlanSponsorLocationAxis_7743F0C46339EE3E703B75B59AB73217" xlink:type="arc"/>

<link:label id="lab_us-gaap_RetirementPlanSponsorLocationDomain_DD1560CECE31EA5AD11975B59AB8B364_terseLabel_en-US" xlink:label="lab_us-gaap_RetirementPlanSponsorLocationDomain_DD1560CECE31EA5AD11975B59AB8B364" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Retirement Plan Sponsor Location [Domain] </link:label>

<link:label id="lab_us-gaap_RetirementPlanSponsorLocationDomain_DD1560CECE31EA5AD11975B59AB8B364_label_en-US" xlink:label="lab_us-gaap_RetirementPlanSponsorLocationDomain_DD1560CECE31EA5AD11975B59AB8B364" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Retirement Plan Sponsor Location [Domain] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetirementPlanSponsorLocationDomain" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_DD1560CECE31EA5AD11975B59AB8B364" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_DD1560CECE31EA5AD11975B59AB8B364" xlink:to="lab_us-gaap_RetirementPlanSponsorLocationDomain_DD1560CECE31EA5AD11975B59AB8B364" xlink:type="arc"/>

<link:label id="lab_us-gaap_ForeignPlanMember_CF0691633E3D8E99A6F675B59AB8BF00_terseLabel_en-US" xlink:label="lab_us-gaap_ForeignPlanMember_CF0691633E3D8E99A6F675B59AB8BF00" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Foreign Plan </link:label>

<link:label id="lab_us-gaap_ForeignPlanMember_CF0691633E3D8E99A6F675B59AB8BF00_label_en-US" xlink:label="lab_us-gaap_ForeignPlanMember_CF0691633E3D8E99A6F675B59AB8BF00" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Foreign Plan [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ForeignPlanMember" xlink:label="loc_us-gaap_ForeignPlanMember_CF0691633E3D8E99A6F675B59AB8BF00" xlink:type="locator"/>

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<link:label id="lab_us-gaap_DefinedBenefitPlanDisclosureLineItems_6FC7997EDC159E66E24575B59AB981EC_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanDisclosureLineItems_6FC7997EDC159E66E24575B59AB981EC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Defined Benefit Plan Disclosure [Line Items] </link:label>

<link:label id="lab_us-gaap_DefinedBenefitPlanDisclosureLineItems_6FC7997EDC159E66E24575B59AB981EC_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanDisclosureLineItems_6FC7997EDC159E66E24575B59AB981EC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Defined Benefit Plan Disclosure [Line Items] </link:label>

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<link:label id="lab_core_DefinedBenefitPlanNumberOfNewEntrantsAfterPensionPlansWereFrozen_DD63340A6C041F5266FC75B59AB95BFC_terseLabel_en-US" xlink:label="lab_core_DefinedBenefitPlanNumberOfNewEntrantsAfterPensionPlansWereFrozen_DD63340A6C041F5266FC75B59AB95BFC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Number of new entrants since plans were frozen </link:label>

<link:label id="lab_core_DefinedBenefitPlanNumberOfNewEntrantsAfterPensionPlansWereFrozen_DD63340A6C041F5266FC75B59AB95BFC_label_en-US" xlink:label="lab_core_DefinedBenefitPlanNumberOfNewEntrantsAfterPensionPlansWereFrozen_DD63340A6C041F5266FC75B59AB95BFC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Defined Benefit Plan, Number of New Entrants after Pension Plans were Frozen </link:label>

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<link:label id="lab_us-gaap_DefinedBenefitPlanContributionsByEmployer_DED07DFC7174B1DAB53175B59ABA88E2_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanContributionsByEmployer_DED07DFC7174B1DAB53175B59ABA88E2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Employer contributions </link:label>

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<link:label id="lab_us-gaap_DefinedContributionPlanCostRecognized_F000B2803E7E7B51B3E375B59ABBDC0C_label_en-US" xlink:label="lab_us-gaap_DefinedContributionPlanCostRecognized_F000B2803E7E7B51B3E375B59ABBDC0C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Defined Contribution Plan, Cost </link:label>

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Filing Submission 0001318084-20-000016 – Alternative Formats (Word / Rich Text, HTML, Plain Text, et al.)

Core-Mark Holding Company, Inc. – ‘10-K’ for 12/31/19 – ‘EX-101.LAB’

On: Monday, 3/2/20, at 6:13am ET · For: 12/31/19 · Accession #: 1318084-20-16 · File #: 0-51515

Previous ‘10-K’: ‘10-K’ on 3/1/19 for 12/31/18 · Next: ‘10-K/A’ on 5/26/20 for 12/31/19 · Latest: ‘10-K’ on 3/1/21 for 12/31/20

Annual Report — Form 10-K — Sect. 13 / 15(d) – SEA’34Filing Table of Contents

‘EX-101.LAB’ — XBRL Labels — core-20191231_lab

This Exhibit is an XBRL XML File.

Annual Report — Form 10-K — Sect. 13 / 15(d) – SEA’34
Filing Table of Contents