SEC Info℠  
    Home      Search      My Interests      Help      Sign In      Please Sign In

Sabine Oil & Gas Corp – ‘10-K/A’ for 12/31/13 – ‘XML’

On:  Wednesday, 10/1/14, at 4:47pm ET   ·   For:  12/31/13   ·   Accession #:  38079-14-80   ·   File #:  1-13515

Previous ‘10-K’:  ‘10-K’ on 2/26/14 for 12/31/13   ·   Next:  ‘10-K’ on 3/31/15 for 12/31/14   ·   Latest:  ‘10-K’ on 3/24/16 for 12/31/15

Find Words in Filings emoji
 		  in    Show  and   ↓Hints

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

10/01/14  Sabine Oil & Gas Corp             10-K/A     12/31/13   97:28M

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

Document/Exhibit                   Description                      Pages   Size 

 1: 10-K/A      Amendment to Annual Report                          HTML   1.88M 
 2: EX-23.1     Consent of Experts or Counsel                       HTML     31K 
 3: EX-23.2     Consent of Experts or Counsel                       HTML     33K 
 4: EX-31.1     Certification -- §302 - SOA'02                      HTML     35K 
 5: EX-31.2     Certification -- §302 - SOA'02                      HTML     35K 
 6: EX-32.1     Certification -- §906 - SOA'02                      HTML     30K 
 7: EX-32.2     Certification -- §906 - SOA'02                      HTML     30K 
66: R1          Document and Entity Information                     HTML     58K 
53: R2          Consolidated Balance Sheets                         HTML    151K 
64: R3          Consolidated Balance Sheets (Parenthetical)         HTML     43K 
69: R4          Consolidated Statements of Operations               HTML    129K 
88: R5          Consolidated Statements of Comprehensive Income     HTML     51K 
55: R6          Consolidated Statement of Equity                    HTML    102K 
63: R7          Consolidated Statements of Cash Flows               HTML    160K 
48: R8          Summary of Significant Accounting Policies          HTML    249K 
38: R9          Property and Equipment                              HTML    102K 
89: R10         Debt                                                HTML    122K 
71: R11         Income Taxes                                        HTML    143K 
70: R12         Shareholders' Equity                                HTML     51K 
76: R13         Stock-Based Compensation                            HTML    310K 
77: R14         Employee Benefits                                   HTML    302K 
74: R15         Fair Value Measurements                             HTML    100K 
78: R16         Derivative Instruments                              HTML    170K 
65: R17         Commitments and Contingencies                       HTML     61K 
67: R18         Costs, Expenses, and Other                          HTML     56K 
73: R19         Selected Quarterly Financial Data (Unaudited)       HTML     74K 
97: R20         Discontinued Operations                             HTML     45K 
84: R21         Supplemental Financial Data-Oil and Gas Producing   HTML    520K 
                Activities (Unaudited)                                           
59: R22         Summary of Significant Accounting Policies          HTML    124K 
                (Policies)                                                       
72: R23         Summary of Significant Accounting Policies          HTML    208K 
                (Tables)                                                         
61: R24         Property and Equipment (Tables)                     HTML     85K 
29: R25         Debt (Tables)                                       HTML     93K 
85: R26         Income Taxes (Tables)                               HTML    144K 
92: R27         Shareholders' Equity (Tables)                       HTML     36K 
43: R28         Stock-Based Compensation (Tables)                   HTML    300K 
42: R29         Employee Benefits (Tables)                          HTML    308K 
46: R30         Fair Value Measurements (Tables)                    HTML    101K 
47: R31         Derivative Instruments (Tables)                     HTML    164K 
49: R32         Commitments and Contingencies (Tables)              HTML     57K 
22: R33         Costs, Expenses, and Other (Tables)                 HTML     45K 
82: R34         Selected Quarterly Financial Data (Unaudited)       HTML     72K 
                (Tables)                                                         
57: R35         Discontinued Operations (Tables)                    HTML     42K 
60: R36         Supplemental Financial Data-Oil and Gas Producing   HTML    527K 
                Activities (Tables)                                              
33: R37         Summary of Significant Accounting Policies          HTML     53K 
                (Description of the Business, Subsequent Event –                 
                Going Concern and Management’s Plan, Cash                        
                Equivalents, Debt Issue Costs and Inventory)                     
                (Details)                                                        
96: R38         Summary of Significant Accounting Policies          HTML     58K 
                (Property and Equipment and Goodwill) (Details)                  
14: R39         Summary of Significant Accounting Policies (Asset   HTML     49K 
                Retirement Obligations) (Details)                                
50: R40         Summary of Significant Accounting Policies (Oil,    HTML     45K 
                Natural Gas, and NGL Sales) (Details)                            
87: R41         Summary of Significant Accounting Policies          HTML     43K 
                (Accounts Receivable) (Details)                                  
31: R42         Summary of Significant Accounting Policies          HTML     81K 
                (Earnings (Loss) per Share) (Details)                            
41: R43         Summary of Significant Accounting Policies          HTML    163K 
                (Comprehensive Income (Loss)) (Details)                          
45: R44         Property and Equipment (Details)                    HTML     69K 
54: R45         Property and Equipment (Divestitures) (Narrative)   HTML    132K 
                (Details)                                                        
21: R46         Debt (Details)                                      HTML    293K 
37: R47         Income Taxes (Components of Income Tax Expense      HTML     60K 
                (Benefit)) (Details)                                             
16: R48         Income Taxes (Income Before Income Tax, Domestic    HTML     41K 
                and Foreign) (Details)                                           
86: R49         Income Taxes (Reconciliation of Income Tax          HTML     57K 
                Computed by Applying Statutory Federal Income Tax                
                Rate) (Details)                                                  
30: R50         Income Taxes (Schedule of Deferred Tax Assets and   HTML     86K 
                Liabilities) (Details)                                           
83: R51         Income Taxes (Summary of Income Tax Contingencies)  HTML     36K 
                (Details)                                                        
34: R52         Income Taxes (Summary of Income Taxes Receivable)   HTML     30K 
                (Details)                                                        
51: R53         Shareholders' Equity (Common Stock and Preferred    HTML     63K 
                Stock) (Details)                                                 
15: R54         Shareholders' Equity (Lone Pine Initial Public      HTML     66K 
                Offering and Spin-off) (Details)                                 
19: R55         Stock-Based Compensation (Narrative) (Details)      HTML     89K 
44: R56         Stock-Based Compensation (Details)                  HTML    197K 
25: R57         Stock-Based Compensation (Range of Exercise         HTML     50K 
                Prices) (Details)                                                
90: R58         Stock-Based Compensation (Employee Stock Purchase   HTML     68K 
                Plan) (Details)                                                  
56: R59         Employee Benefits (Expected Benefit Payments)       HTML     84K 
                (Details)                                                        
75: R60         Employee Benefits (Fair Value of Plan Assets)       HTML     88K 
                (Details)                                                        
36: R61         Employee Benefits (Fair Value of Plan Assets        HTML     81K 
                Parenthetical) (Details)                                         
39: R62         Employee Benefits (Investments of the Plan and      HTML     80K 
                Funded Status) (Details)                                         
81: R63         Employee Benefits (Annual Periodic Expense and      HTML     75K 
                Actuarial Assumptions) (Details)                                 
79: R64         Employee Benefits (Other Employee Benefit Plans)    HTML     45K 
                (Details)                                                        
58: R65         Fair Value Measurements (Details)                   HTML     42K 
80: R66         Fair Value Measurements (Details 2)                 HTML     66K 
35: R67         Derivative Instruments (Details)                    HTML     46K 
62: R68         Derivative Instruments (Details 2)                  HTML     51K 
91: R69         Derivative Instruments (Details 3)                  HTML     42K 
18: R70         Derivative Instruments (Details 4)                  HTML     74K 
28: R71         Commitments and Contingencies (Details)             HTML     83K 
52: R72         Commitments and Contingencies (Narrative)           HTML     44K 
                (Details)                                                        
24: R73         Costs, Expenses, and Other (Details)                HTML     79K 
94: R74         Selected Quarterly Financial Data (Unaudited)       HTML     55K 
                (Details)                                                        
32: R75         Discontinued Operations (Details)                   HTML     63K 
26: R76         Supplemental Financial Data-Oil and Gas Producing   HTML    134K 
                Activities (Schedule of Proved Developed and                     
                Undeveloped Oil and Gas Reserve) (Details)                       
27: R77         Supplemental Financial Data-Oil and Gas Producing   HTML     42K 
                Activities (Capitalized Costs Relating to Oil and                
                Gas Producing Activities) (Details)                              
20: R78         Supplemental Financial Data-Oil and Gas Producing   HTML     52K 
                Activities (Cost Incurred in Oil and Gas Property                
                Acquisition, Exploration, and Development                        
                Activities) (Details)                                            
23: R79         Supplemental Financial Data-Oil and Gas Producing   HTML     62K 
                Activities (Results of Operations for Oil and Gas                
                Producing Activities) (Details)                                  
68: R80         Supplemental Financial Data-Oil and Gas Producing   HTML    115K 
                Activities (Standardized Measure of Discounted                   
                Future Cash Flows Relating to Proved Reserves)                   
                (Details)                                                        
93: XML         IDEA XML File -- Filing Summary                      XML    156K 
17: EXCEL       IDEA Workbook of Financial Reports                  XLSX    545K 
40: EXCEL       IDEA Workbook of Financial Reports (.xls)            XLS   4.83M 
 8: EX-101.INS  XBRL Instance -- fst-20131231                        XML   7.14M 
10: EX-101.CAL  XBRL Calculations -- fst-20131231_cal                XML    446K 
11: EX-101.DEF  XBRL Definitions -- fst-20131231_def                 XML   1.30M 
12: EX-101.LAB  XBRL Labels -- fst-20131231_lab                      XML   3.42M 
13: EX-101.PRE  XBRL Presentations -- fst-20131231_pre               XML   1.78M 
 9: EX-101.SCH  XBRL Schema -- fst-20131231                          XSD    316K 
95: ZIP         XBRL Zipped Folder -- 0000038079-14-000080-xbrl      Zip    550K

‘XML’   —   IDEA XML File — Filing Summary

This Document is an IDEA XML File.

                                                                                                                                                                                
<?xml version="1.0" encoding="windows-1252"?>
<FilingSummary xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<Version> 2.4.0.8 </Version>
<ProcessingTime/>
<ReportFormat> Html </ReportFormat>
<ContextCount> 508 </ContextCount>
<ElementCount> 662 </ElementCount>
<EntityCount> 1 </EntityCount>
<FootnotesReported> true </FootnotesReported>
<SegmentCount> 156 </SegmentCount>
<ScenarioCount> 0 </ScenarioCount>
<TuplesReported> false </TuplesReported>
<UnitCount> 24 </UnitCount>
<MyReports>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R1.htm </HtmlFileName>
<LongName> 0001000 - Document - Document and Entity Information </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/DocumentAndEntityInformation </Role>
<ShortName> Document and Entity Information </ShortName>
</Report>
<Report>
<IsDefault> true </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R2.htm </HtmlFileName>
<LongName> 1001000 - Statement - CONSOLIDATED BALANCE SHEETS </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/ConsolidatedBalanceSheets </Role>
<ShortName> CONSOLIDATED BALANCE SHEETS </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R3.htm </HtmlFileName>
<LongName> 1001501 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/ConsolidatedBalanceSheetsParenthetical </Role>
<ShortName> CONSOLIDATED BALANCE SHEETS (Parenthetical) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R4.htm </HtmlFileName>
<LongName> 1002000 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/ConsolidatedStatementsOfOperations </Role>
<ShortName> CONSOLIDATED STATEMENTS OF OPERATIONS </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R5.htm </HtmlFileName>
<LongName> 1003000 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/ConsolidatedStatementsOfComprehensiveIncome </Role>
<ShortName> CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R6.htm </HtmlFileName>
<LongName> 1004000 - Statement - CONSOLIDATED STATEMENT OF EQUITY </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/ConsolidatedStatementOfEquity </Role>
<ShortName> CONSOLIDATED STATEMENT OF EQUITY </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R7.htm </HtmlFileName>
<LongName> 1005000 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/ConsolidatedStatementsOfCashFlows </Role>
<ShortName> CONSOLIDATED STATEMENTS OF CASH FLOWS </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R8.htm </HtmlFileName>
<LongName> 2101100 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/SummaryOfSignificantAccountingPolicies </Role>
<ShortName> SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R9.htm </HtmlFileName>
<LongName> 2102100 - Disclosure - PROPERTY AND EQUIPMENT </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/PropertyAndEquipment </Role>
<ShortName> PROPERTY AND EQUIPMENT </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R10.htm </HtmlFileName>
<LongName> 2104100 - Disclosure - DEBT </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/Debt </Role>
<ShortName> DEBT </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R11.htm </HtmlFileName>
<LongName> 2105100 - Disclosure - INCOME TAXES </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/IncomeTaxes </Role>
<ShortName> INCOME TAXES </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R12.htm </HtmlFileName>
<LongName> 2106100 - Disclosure - SHAREHOLDERS' EQUITY </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/ShareholdersEquity </Role>
<ShortName> SHAREHOLDERS' EQUITY </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R13.htm </HtmlFileName>
<LongName> 2107100 - Disclosure - STOCK-BASED COMPENSATION </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/StockBasedCompensation </Role>
<ShortName> STOCK-BASED COMPENSATION </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R14.htm </HtmlFileName>
<LongName> 2108100 - Disclosure - EMPLOYEE BENEFITS </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/EmployeeBenefits </Role>
<ShortName> EMPLOYEE BENEFITS </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R15.htm </HtmlFileName>
<LongName> 2109100 - Disclosure - FAIR VALUE MEASUREMENTS </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/FairValueMeasurements </Role>
<ShortName> FAIR VALUE MEASUREMENTS </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R16.htm </HtmlFileName>
<LongName> 2110100 - Disclosure - DERIVATIVE INSTRUMENTS </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/DerivativeInstruments </Role>
<ShortName> DERIVATIVE INSTRUMENTS </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R17.htm </HtmlFileName>
<LongName> 2111100 - Disclosure - COMMITMENTS AND CONTINGENCIES </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/CommitmentsAndContingencies </Role>
<ShortName> COMMITMENTS AND CONTINGENCIES </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R18.htm </HtmlFileName>
<LongName> 2112100 - Disclosure - COSTS, EXPENSES, AND OTHER </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/CostsExpensesAndOther </Role>
<ShortName> COSTS, EXPENSES, AND OTHER </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R19.htm </HtmlFileName>
<LongName> 2113100 - Disclosure - SELECTED QUARTERLY FINANCIAL DATA (unaudited) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/SelectedQuarterlyFinancialDataUnaudited </Role>
<ShortName> SELECTED QUARTERLY FINANCIAL DATA (unaudited) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R20.htm </HtmlFileName>
<LongName> 2114100 - Disclosure - DISCONTINUED OPERATIONS </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/DiscontinuedOperations </Role>
<ShortName> DISCONTINUED OPERATIONS </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R21.htm </HtmlFileName>
<LongName> 2115100 - Disclosure - SUPPLEMENTAL FINANCIAL DATA-OIL AND GAS PRODUCING ACTIVITIES (unaudited) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/SupplementalFinancialDataOilAndGasProducingActivitiesUnaudited </Role>
<ShortName> SUPPLEMENTAL FINANCIAL DATA-OIL AND GAS PRODUCING ACTIVITIES (unaudited) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R22.htm </HtmlFileName>
<LongName> 2201201 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/SummaryOfSignificantAccountingPoliciesPolicies </Role>
<ShortName> SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R23.htm </HtmlFileName>
<LongName> 2301302 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/SummaryOfSignificantAccountingPoliciesTables </Role>
<ShortName> SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R24.htm </HtmlFileName>
<LongName> 2302301 - Disclosure - PROPERTY AND EQUIPMENT (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/PropertyAndEquipmentTables </Role>
<ShortName> PROPERTY AND EQUIPMENT (Tables) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R25.htm </HtmlFileName>
<LongName> 2304301 - Disclosure - DEBT (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/DebtTables </Role>
<ShortName> DEBT (Tables) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R26.htm </HtmlFileName>
<LongName> 2305301 - Disclosure - INCOME TAXES (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/IncomeTaxesTables </Role>
<ShortName> INCOME TAXES (Tables) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R27.htm </HtmlFileName>
<LongName> 2306301 - Disclosure - SHAREHOLDERS' EQUITY (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/ShareholdersEquityTables </Role>
<ShortName> SHAREHOLDERS' EQUITY (Tables) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R28.htm </HtmlFileName>
<LongName> 2307301 - Disclosure - STOCK-BASED COMPENSATION (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/StockBasedCompensationTables </Role>
<ShortName> STOCK-BASED COMPENSATION (Tables) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R29.htm </HtmlFileName>
<LongName> 2308301 - Disclosure - EMPLOYEE BENEFITS (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/EmployeeBenefitsTables </Role>
<ShortName> EMPLOYEE BENEFITS (Tables) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R30.htm </HtmlFileName>
<LongName> 2309301 - Disclosure - FAIR VALUE MEASUREMENTS (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/FairValueMeasurementsTables </Role>
<ShortName> FAIR VALUE MEASUREMENTS (Tables) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R31.htm </HtmlFileName>
<LongName> 2310301 - Disclosure - DERIVATIVE INSTRUMENTS (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/DerivativeInstrumentsTables </Role>
<ShortName> DERIVATIVE INSTRUMENTS (Tables) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R32.htm </HtmlFileName>
<LongName> 2311301 - Disclosure - COMMITMENTS AND CONTINGENCIES (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/CommitmentsAndContingenciesTables </Role>
<ShortName> COMMITMENTS AND CONTINGENCIES (Tables) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R33.htm </HtmlFileName>
<LongName> 2312301 - Disclosure - COSTS, EXPENSES, AND OTHER (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/CostsExpensesAndOtherTables </Role>
<ShortName> COSTS, EXPENSES, AND OTHER (Tables) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R34.htm </HtmlFileName>
<LongName> 2313301 - Disclosure - SELECTED QUARTERLY FINANCIAL DATA (unaudited) (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/SelectedQuarterlyFinancialDataUnauditedTables </Role>
<ShortName> SELECTED QUARTERLY FINANCIAL DATA (unaudited) (Tables) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R35.htm </HtmlFileName>
<LongName> 2314301 - Disclosure - DISCONTINUED OPERATIONS (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/DiscontinuedOperationsTables </Role>
<ShortName> DISCONTINUED OPERATIONS (Tables) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R36.htm </HtmlFileName>
<LongName> 2315301 - Disclosure - SUPPLEMENTAL FINANCIAL DATA-OIL AND GAS PRODUCING ACTIVITIES (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/SupplementalFinancialDataOilAndGasProducingActivitiesTables </Role>
<ShortName> SUPPLEMENTAL FINANCIAL DATA-OIL AND GAS PRODUCING ACTIVITIES (Tables) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R37.htm </HtmlFileName>
<LongName> 2401403 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Description of the Business, Subsequent Event – Going Concern and Management’s Plan, Cash Equivalents, Debt Issue Costs and Inventory) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/SummaryOfSignificantAccountingPoliciesDescriptionOfBusinessSubsequentEventGoingConcernAndManagementsPlanCashEquivalentsDebtIssueCostsAndInventoryDetails </Role>
<ShortName> SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Description of the Business, Subsequent Event – Going Concern and Management’s Plan, Cash Equivalents, Debt Issue Costs and Inventory) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R38.htm </HtmlFileName>
<LongName> 2401404 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Property and Equipment and Goodwill) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/SummaryOfSignificantAccountingPoliciesPropertyAndEquipmentAndGoodwillDetails </Role>
<ShortName> SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Property and Equipment and Goodwill) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R39.htm </HtmlFileName>
<LongName> 2401405 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Asset Retirement Obligations) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/SummaryOfSignificantAccountingPoliciesAssetRetirementObligationsDetails </Role>
<ShortName> SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Asset Retirement Obligations) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R40.htm </HtmlFileName>
<LongName> 2401406 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Oil, Natural Gas, and NGL Sales) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/SummaryOfSignificantAccountingPoliciesOilNaturalGasAndNglSalesDetails </Role>
<ShortName> SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Oil, Natural Gas, and NGL Sales) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R41.htm </HtmlFileName>
<LongName> 2401407 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Accounts Receivable) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/SummaryOfSignificantAccountingPoliciesAccountsReceivableDetails </Role>
<ShortName> SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Accounts Receivable) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R42.htm </HtmlFileName>
<LongName> 2401408 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Earnings (Loss) per Share) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/SummaryOfSignificantAccountingPoliciesEarningsLossPerShareDetails </Role>
<ShortName> SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Earnings (Loss) per Share) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R43.htm </HtmlFileName>
<LongName> 2401409 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Comprehensive Income (Loss)) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/SummaryOfSignificantAccountingPoliciesComprehensiveIncomeLossDetails </Role>
<ShortName> SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Comprehensive Income (Loss)) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R44.htm </HtmlFileName>
<LongName> 2402402 - Disclosure - PROPERTY AND EQUIPMENT (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/PropertyAndEquipmentDetails </Role>
<ShortName> PROPERTY AND EQUIPMENT (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R45.htm </HtmlFileName>
<LongName> 2402403 - Disclosure - PROPERTY AND EQUIPMENT (Divestitures) (Narrative) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/PropertyAndEquipmentDivestituresNarrativeDetails </Role>
<ShortName> PROPERTY AND EQUIPMENT (Divestitures) (Narrative) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R46.htm </HtmlFileName>
<LongName> 2404402 - Disclosure - DEBT (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/DebtDetails </Role>
<ShortName> DEBT (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R47.htm </HtmlFileName>
<LongName> 2405402 - Disclosure - INCOME TAXES (Components of Income Tax Expense (Benefit)) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/IncomeTaxesComponentsOfIncomeTaxExpenseBenefitDetails </Role>
<ShortName> INCOME TAXES (Components of Income Tax Expense (Benefit)) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R48.htm </HtmlFileName>
<LongName> 2405403 - Disclosure - INCOME TAXES (Income Before Income Tax, Domestic and Foreign) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/IncomeTaxesIncomeBeforeIncomeTaxDomesticAndForeignDetails </Role>
<ShortName> INCOME TAXES (Income Before Income Tax, Domestic and Foreign) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R49.htm </HtmlFileName>
<LongName> 2405404 - Disclosure - INCOME TAXES (Reconciliation of Income Tax Computed by Applying Statutory Federal Income Tax Rate) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/IncomeTaxesReconciliationOfIncomeTaxComputedByApplyingStatutoryFederalIncomeTaxRateDetails </Role>
<ShortName> INCOME TAXES (Reconciliation of Income Tax Computed by Applying Statutory Federal Income Tax Rate) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R50.htm </HtmlFileName>
<LongName> 2405405 - Disclosure - INCOME TAXES (Schedule of Deferred Tax Assets and Liabilities) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/IncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails </Role>
<ShortName> INCOME TAXES (Schedule of Deferred Tax Assets and Liabilities) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R51.htm </HtmlFileName>
<LongName> 2405406 - Disclosure - INCOME TAXES (Summary of Income Tax Contingencies) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/IncomeTaxesSummaryOfIncomeTaxContingenciesDetails </Role>
<ShortName> INCOME TAXES (Summary of Income Tax Contingencies) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R52.htm </HtmlFileName>
<LongName> 2405407 - Disclosure - INCOME TAXES (Summary of Income Taxes Receivable) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/IncomeTaxesSummaryOfIncomeTaxesReceivableDetails </Role>
<ShortName> INCOME TAXES (Summary of Income Taxes Receivable) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R53.htm </HtmlFileName>
<LongName> 2406402 - Disclosure - SHAREHOLDERS' EQUITY (Common Stock and Preferred Stock) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/ShareholdersEquityCommonStockAndPreferredStockDetails </Role>
<ShortName> SHAREHOLDERS' EQUITY (Common Stock and Preferred Stock) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R54.htm </HtmlFileName>
<LongName> 2406403 - Disclosure - SHAREHOLDERS' EQUITY (Lone Pine Initial Public Offering and Spin-off) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/ShareholdersEquityLonePineInitialPublicOfferingAndSpinOffDetails </Role>
<ShortName> SHAREHOLDERS' EQUITY (Lone Pine Initial Public Offering and Spin-off) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R55.htm </HtmlFileName>
<LongName> 2407402 - Disclosure - STOCK-BASED COMPENSATION (Narrative) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/StockBasedCompensationNarrativeDetails </Role>
<ShortName> STOCK-BASED COMPENSATION (Narrative) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R56.htm </HtmlFileName>
<LongName> 2407403 - Disclosure - STOCK-BASED COMPENSATION (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/StockBasedCompensationDetails </Role>
<ShortName> STOCK-BASED COMPENSATION (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R57.htm </HtmlFileName>
<LongName> 2407404 - Disclosure - STOCK-BASED COMPENSATION (Range of Exercise Prices) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/StockBasedCompensationRangeOfExercisePricesDetails </Role>
<ShortName> STOCK-BASED COMPENSATION (Range of Exercise Prices) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R58.htm </HtmlFileName>
<LongName> 2407405 - Disclosure - STOCK-BASED COMPENSATION (Employee Stock Purchase Plan) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/StockBasedCompensationEmployeeStockPurchasePlanDetails </Role>
<ShortName> STOCK-BASED COMPENSATION (Employee Stock Purchase Plan) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R59.htm </HtmlFileName>
<LongName> 2408402 - Disclosure - EMPLOYEE BENEFITS (Expected Benefit Payments) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/EmployeeBenefitsExpectedBenefitPaymentsDetails </Role>
<ShortName> EMPLOYEE BENEFITS (Expected Benefit Payments) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R60.htm </HtmlFileName>
<LongName> 2408403 - Disclosure - EMPLOYEE BENEFITS (Fair Value of Plan Assets) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/EmployeeBenefitsFairValueOfPlanAssetsDetails </Role>
<ShortName> EMPLOYEE BENEFITS (Fair Value of Plan Assets) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R61.htm </HtmlFileName>
<LongName> 2408404 - Disclosure - EMPLOYEE BENEFITS (Fair Value of Plan Assets Parenthetical) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/EmployeeBenefitsFairValueOfPlanAssetsParentheticalDetails </Role>
<ShortName> EMPLOYEE BENEFITS (Fair Value of Plan Assets Parenthetical) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R62.htm </HtmlFileName>
<LongName> 2408405 - Disclosure - EMPLOYEE BENEFITS (Investments of the Plan and Funded Status) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/EmployeeBenefitsInvestmentsOfPlanAndFundedStatusDetails </Role>
<ShortName> EMPLOYEE BENEFITS (Investments of the Plan and Funded Status) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R63.htm </HtmlFileName>
<LongName> 2408406 - Disclosure - EMPLOYEE BENEFITS (Annual Periodic Expense and Actuarial Assumptions) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/EmployeeBenefitsAnnualPeriodicExpenseAndActuarialAssumptionsDetails </Role>
<ShortName> EMPLOYEE BENEFITS (Annual Periodic Expense and Actuarial Assumptions) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R64.htm </HtmlFileName>
<LongName> 2408407 - Disclosure - EMPLOYEE BENEFITS (Other Employee Benefit Plans) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/EmployeeBenefitsOtherEmployeeBenefitPlansDetails </Role>
<ShortName> EMPLOYEE BENEFITS (Other Employee Benefit Plans) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R65.htm </HtmlFileName>
<LongName> 2409402 - Disclosure - FAIR VALUE MEASUREMENTS (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/FairValueMeasurementsDetails </Role>
<ShortName> FAIR VALUE MEASUREMENTS (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R66.htm </HtmlFileName>
<LongName> 2409403 - Disclosure - FAIR VALUE MEASUREMENTS (Details 2) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/FairValueMeasurementsDetails2 </Role>
<ShortName> FAIR VALUE MEASUREMENTS (Details 2) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R67.htm </HtmlFileName>
<LongName> 2410402 - Disclosure - DERIVATIVE INSTRUMENTS (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/DerivativeInstrumentsDetails </Role>
<ShortName> DERIVATIVE INSTRUMENTS (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R68.htm </HtmlFileName>
<LongName> 2410403 - Disclosure - DERIVATIVE INSTRUMENTS (Details 2) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/DerivativeInstrumentsDetails2 </Role>
<ShortName> DERIVATIVE INSTRUMENTS (Details 2) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R69.htm </HtmlFileName>
<LongName> 2410404 - Disclosure - DERIVATIVE INSTRUMENTS (Details 3) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/DerivativeInstrumentsDetails3 </Role>
<ShortName> DERIVATIVE INSTRUMENTS (Details 3) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R70.htm </HtmlFileName>
<LongName> 2410405 - Disclosure - DERIVATIVE INSTRUMENTS (Details 4) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/DerivativeInstrumentsDetails4 </Role>
<ShortName> DERIVATIVE INSTRUMENTS (Details 4) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R71.htm </HtmlFileName>
<LongName> 2411402 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/CommitmentsAndContingenciesDetails </Role>
<ShortName> COMMITMENTS AND CONTINGENCIES (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R72.htm </HtmlFileName>
<LongName> 2411403 - Disclosure - COMMITMENTS AND CONTINGENCIES (Narrative) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/CommitmentsAndContingenciesNarrativeDetails </Role>
<ShortName> COMMITMENTS AND CONTINGENCIES (Narrative) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R73.htm </HtmlFileName>
<LongName> 2412402 - Disclosure - COSTS, EXPENSES, AND OTHER (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/CostsExpensesAndOtherDetails </Role>
<ShortName> COSTS, EXPENSES, AND OTHER (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R74.htm </HtmlFileName>
<LongName> 2413402 - Disclosure - SELECTED QUARTERLY FINANCIAL DATA (unaudited) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/SelectedQuarterlyFinancialDataUnauditedDetails </Role>
<ShortName> SELECTED QUARTERLY FINANCIAL DATA (unaudited) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R75.htm </HtmlFileName>
<LongName> 2414402 - Disclosure - DISCONTINUED OPERATIONS (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/DiscontinuedOperationsDetails </Role>
<ShortName> DISCONTINUED OPERATIONS (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R76.htm </HtmlFileName>
<LongName> 2415402 - Disclosure - SUPPLEMENTAL FINANCIAL DATA-OIL AND GAS PRODUCING ACTIVITIES (Schedule of Proved Developed and Undeveloped Oil and Gas Reserve) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/SupplementalFinancialDataOilAndGasProducingActivitiesScheduleOfProvedDevelopedAndUndevelopedOilAndGasReserveDetails </Role>
<ShortName> SUPPLEMENTAL FINANCIAL DATA-OIL AND GAS PRODUCING ACTIVITIES (Schedule of Proved Developed and Undeveloped Oil and Gas Reserve) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R77.htm </HtmlFileName>
<LongName> 2415403 - Disclosure - SUPPLEMENTAL FINANCIAL DATA-OIL AND GAS PRODUCING ACTIVITIES (Capitalized Costs Relating to Oil and Gas Producing Activities) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/SupplementalFinancialDataOilAndGasProducingActivitiesCapitalizedCostsRelatingToOilAndGasProducingActivitiesDetails </Role>
<ShortName> SUPPLEMENTAL FINANCIAL DATA-OIL AND GAS PRODUCING ACTIVITIES (Capitalized Costs Relating to Oil and Gas Producing Activities) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R78.htm </HtmlFileName>
<LongName> 2415404 - Disclosure - SUPPLEMENTAL FINANCIAL DATA-OIL AND GAS PRODUCING ACTIVITIES (Cost Incurred in Oil and Gas Property Acquisition, Exploration, and Development Activities) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/SupplementalFinancialDataOilAndGasProducingActivitiesCostIncurredInOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivitiesDetails </Role>
<ShortName> SUPPLEMENTAL FINANCIAL DATA-OIL AND GAS PRODUCING ACTIVITIES (Cost Incurred in Oil and Gas Property Acquisition, Exploration, and Development Activities) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R79.htm </HtmlFileName>
<LongName> 2415405 - Disclosure - SUPPLEMENTAL FINANCIAL DATA-OIL AND GAS PRODUCING ACTIVITIES (Results of Operations for Oil and Gas Producing Activities) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/SupplementalFinancialDataOilAndGasProducingActivitiesResultsOfOperationsForOilAndGasProducingActivitiesDetails </Role>
<ShortName> SUPPLEMENTAL FINANCIAL DATA-OIL AND GAS PRODUCING ACTIVITIES (Results of Operations for Oil and Gas Producing Activities) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R80.htm </HtmlFileName>
<LongName> 2415406 - Disclosure - SUPPLEMENTAL FINANCIAL DATA-OIL AND GAS PRODUCING ACTIVITIES (Standardized Measure of Discounted Future Cash Flows Relating to Proved Reserves) (Details) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.forestoil.com/role/SupplementalFinancialDataOilAndGasProducingActivitiesStandardizedMeasureOfDiscountedFutureCashFlowsRelatingToProvedReservesDetails </Role>
<ShortName> SUPPLEMENTAL FINANCIAL DATA-OIL AND GAS PRODUCING ACTIVITIES (Standardized Measure of Discounted Future Cash Flows Relating to Proved Reserves) (Details) </ShortName>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<LongName> All Reports </LongName>
<ReportType> Book </ReportType>
<ShortName> All Reports </ShortName>
</Report>
</MyReports>
<Logs>
<Log type="Info"> Element us-gaap_AmortizationExpensePerPhysicalUnitOfProduction had a mix of decimals attribute values: 0 2. </Log>
<Log type="Info"> Element us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 had a mix of decimals attribute values: 0 3. </Log>
<Log type="Info"> Element us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment had a mix of decimals attribute values: -5 -3. </Log>
<Log type="Info"> Element us-gaap_GainLossOnSaleOfOilAndGasProperty had a mix of decimals attribute values: -5 -3. </Log>
<Log type="Info"> Element us-gaap_LegalFees had a mix of decimals attribute values: -5 -3. </Log>
<Log type="Info"> Element us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity had a mix of decimals attribute values: -8 -5. </Log>
<Log type="Info"> Element us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt had a mix of decimals attribute values: -5 -3. </Log>
<Log type="Info"> Element us-gaap_Revenues had a mix of decimals attribute values: -5 -3. </Log>
<Log type="Info"> Element us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue had a mix of decimals attribute values: 0 2. </Log>
<Log type="Info"> Element us-gaap_SharesOutstanding had a mix of decimals attribute values: -3 0. </Log>
<Log type="Info"> Element us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised had a mix of decimals attribute values: -3 0. </Log>
<Log type="Info"> 'Monetary' elements on report '2401404 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Property and Equipment and Goodwill) (Details)' had a mix of different decimal attribute values. </Log>
<Log type="Info"> 'Monetary' elements on report '2401406 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Oil, Natural Gas, and NGL Sales) (Details)' had a mix of different decimal attribute values. </Log>
<Log type="Info"> 'Monetary' elements on report '2401409 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Comprehensive Income (Loss)) (Details)' had a mix of different decimal attribute values. </Log>
<Log type="Info"> 'Monetary' elements on report '2402403 - Disclosure - PROPERTY AND EQUIPMENT (Divestitures) (Narrative) (Details)' had a mix of different decimal attribute values. </Log>
<Log type="Info"> 'Monetary' elements on report '2405405 - Disclosure - INCOME TAXES (Schedule of Deferred Tax Assets and Liabilities) (Details)' had a mix of different decimal attribute values. </Log>
<Log type="Info"> 'Monetary' elements on report '2406403 - Disclosure - SHAREHOLDERS' EQUITY (Lone Pine Initial Public Offering and Spin-off) (Details)' had a mix of different decimal attribute values. </Log>
<Log type="Info"> 'Shares' elements on report '2407402 - Disclosure - STOCK-BASED COMPENSATION (Narrative) (Details)' had a mix of different decimal attribute values. </Log>
<Log type="Info"> 'Shares' elements on report '2407405 - Disclosure - STOCK-BASED COMPENSATION (Employee Stock Purchase Plan) (Details)' had a mix of different decimal attribute values. </Log>
<Log type="Info"> 'Monetary' elements on report '2408402 - Disclosure - EMPLOYEE BENEFITS (Expected Benefit Payments) (Details)' had a mix of different decimal attribute values. </Log>
<Log type="Info"> 'Monetary' elements on report '2408403 - Disclosure - EMPLOYEE BENEFITS (Fair Value of Plan Assets) (Details)' had a mix of different decimal attribute values. </Log>
<Log type="Info"> 'Monetary' elements on report '2408406 - Disclosure - EMPLOYEE BENEFITS (Annual Periodic Expense and Actuarial Assumptions) (Details)' had a mix of different decimal attribute values. </Log>
<Log type="Info"> 'Monetary' elements on report '2409403 - Disclosure - FAIR VALUE MEASUREMENTS (Details 2)' had a mix of different decimal attribute values. </Log>
<Log type="Info"> 'Monetary' elements on report '2412402 - Disclosure - COSTS, EXPENSES, AND OTHER (Details)' had a mix of different decimal attribute values. </Log>
<Log type="Info"> 'Monetary' elements on report '2415404 - Disclosure - SUPPLEMENTAL FINANCIAL DATA-OIL AND GAS PRODUCING ACTIVITIES (Cost Incurred in Oil and Gas Property Acquisition, Exploration, and Development Activities) (Details)' had a mix of different decimal attribute values. </Log>
<Log type="Info"> Process Flow-Through: 1001000 - Statement - CONSOLIDATED BALANCE SHEETS </Log>
<Log type="Info"> Process Flow-Through: Removing column 'Dec. 31, 2011' </Log>
<Log type="Info"> Process Flow-Through: Removing column 'Dec. 31, 2010' </Log>
<Log type="Info"> Process Flow-Through: 1001501 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical) </Log>
<Log type="Info"> Process Flow-Through: 1002000 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS </Log>
<Log type="Info"> Process Flow-Through: Removing column '3 Months Ended Dec. 31, 2013' </Log>
<Log type="Info"> Process Flow-Through: Removing column '3 Months Ended Sep. 30, 2013' </Log>
<Log type="Info"> Process Flow-Through: Removing column '3 Months Ended Jun. 30, 2013' </Log>
<Log type="Info"> Process Flow-Through: Removing column '3 Months Ended Mar. 31, 2013' </Log>
<Log type="Info"> Process Flow-Through: Removing column '3 Months Ended Dec. 31, 2012' </Log>
<Log type="Info"> Process Flow-Through: Removing column '3 Months Ended Sep. 30, 2012' </Log>
<Log type="Info"> Process Flow-Through: Removing column '3 Months Ended Jun. 30, 2012' </Log>
<Log type="Info"> Process Flow-Through: Removing column '3 Months Ended Mar. 31, 2012' </Log>
<Log type="Info"> Process Flow-Through: Removing column '9 Months Ended Sep. 30, 2011' </Log>
<Log type="Info"> Process Flow-Through: 1003000 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME </Log>
<Log type="Info"> Process Flow-Through: Removing column '3 Months Ended Dec. 31, 2013' </Log>
<Log type="Info"> Process Flow-Through: Removing column '3 Months Ended Sep. 30, 2013' </Log>
<Log type="Info"> Process Flow-Through: Removing column '3 Months Ended Jun. 30, 2013' </Log>
<Log type="Info"> Process Flow-Through: Removing column '3 Months Ended Mar. 31, 2013' </Log>
<Log type="Info"> Process Flow-Through: Removing column '3 Months Ended Dec. 31, 2012' </Log>
<Log type="Info"> Process Flow-Through: Removing column '3 Months Ended Sep. 30, 2012' </Log>
<Log type="Info"> Process Flow-Through: Removing column '3 Months Ended Jun. 30, 2012' </Log>
<Log type="Info"> Process Flow-Through: Removing column '3 Months Ended Mar. 31, 2012' </Log>
<Log type="Info"> Process Flow-Through: 1005000 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS </Log>
</Logs>
<InputFiles>
<File> fst-20131231.xml </File>
<File> fst-20131231.xsd </File>
<File> fst-20131231_cal.xml </File>
<File> fst-20131231_def.xml </File>
<File> fst-20131231_lab.xml </File>
<File> fst-20131231_pre.xml </File>
</InputFiles>
<SupplementalFiles/>
<BaseTaxonomies/>
<HasPresentationLinkbase> true </HasPresentationLinkbase>
<HasCalculationLinkbase> true </HasCalculationLinkbase>
</FilingSummary>

↑Top
Filing Submission 0000038079-14-000080   –   Alternative Formats (Word / Rich Text, HTML, Plain Text, et al.)
Copyright © 2024 Fran Finnegan & Company LLC – All Rights Reserved.
About — Privacy — Redactions — Help — Fri., May 3, 5:15:11.1pm ET