Investments, Investment Income and Net Realized Gains Losses (Details) (USD $) In Thousands, unless otherwise specified
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3 Months Ended |
12 Months Ended |
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Net Investment Income [Abstract] |
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Investment income |
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$ 73,081us-gaap_InterestAndDividendIncomeOperating |
$ 76,064us-gaap_InterestAndDividendIncomeOperating |
$ 104,274us-gaap_InterestAndDividendIncomeOperating |
Investment expenses |
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(3,660)us-gaap_InvestmentIncomeInvestmentExpense |
(4,018)us-gaap_InvestmentIncomeInvestmentExpense |
(4,327)us-gaap_InvestmentIncomeInvestmentExpense |
Net investment income (expense) |
16,561us-gaap_InvestmentIncomeNet |
17,523us-gaap_InvestmentIncomeNet |
17,645us-gaap_InvestmentIncomeNet |
17,692us-gaap_InvestmentIncomeNet |
17,936us-gaap_InvestmentIncomeNet |
17,758us-gaap_InvestmentIncomeNet |
17,808us-gaap_InvestmentIncomeNet |
18,544us-gaap_InvestmentIncomeNet |
69,421us-gaap_InvestmentIncomeNet |
72,046us-gaap_InvestmentIncomeNet |
99,947us-gaap_InvestmentIncomeNet |
Net Realized Gain (Loss) on Investments [Abstract] |
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Gross realized gains on the sale of investments |
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5,372us-gaap_AvailableForSaleSecuritiesGrossRealizedGains |
27,258us-gaap_AvailableForSaleSecuritiesGrossRealizedGains |
90,100us-gaap_AvailableForSaleSecuritiesGrossRealizedGains |
Gross realized losses on the sale of investments |
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0us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments |
(15)us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments |
(3)us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments |
Net realized gains on the sale of investments |
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5,372us-gaap_AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments |
27,243us-gaap_AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments |
90,097us-gaap_AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments |
Fair value adjustments on trading securities |
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(2,610)us-gaap_NetRealizedOrUnrealizedGainLossOnTradingSecurities |
(3,323)us-gaap_NetRealizedOrUnrealizedGainLossOnTradingSecurities |
(1,343)us-gaap_NetRealizedOrUnrealizedGainLossOnTradingSecurities |
Net realized gains (losses) on investments |
764us-gaap_MarketableSecuritiesGainLossExcludingOtherThanTemporaryImpairments |
3,109us-gaap_MarketableSecuritiesGainLossExcludingOtherThanTemporaryImpairments |
(596)us-gaap_MarketableSecuritiesGainLossExcludingOtherThanTemporaryImpairments |
(515)us-gaap_MarketableSecuritiesGainLossExcludingOtherThanTemporaryImpairments |
(778)us-gaap_MarketableSecuritiesGainLossExcludingOtherThanTemporaryImpairments |
(306)us-gaap_MarketableSecuritiesGainLossExcludingOtherThanTemporaryImpairments |
11,686us-gaap_MarketableSecuritiesGainLossExcludingOtherThanTemporaryImpairments |
13,318us-gaap_MarketableSecuritiesGainLossExcludingOtherThanTemporaryImpairments |
2,762us-gaap_MarketableSecuritiesGainLossExcludingOtherThanTemporaryImpairments |
23,920us-gaap_MarketableSecuritiesGainLossExcludingOtherThanTemporaryImpairments |
88,754us-gaap_MarketableSecuritiesGainLossExcludingOtherThanTemporaryImpairments |
Fixed Maturity Securities [Member] |
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Net Investment Income [Abstract] |
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Investment income |
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66,749us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_DebtSecuritiesMember |
68,455us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_DebtSecuritiesMember |
94,307us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_DebtSecuritiesMember |
Short-Term Investment And Cash And Cash Equivalents [Member] |
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Net Investment Income [Abstract] |
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Investment income |
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2,794us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = ptp_ShortTermInvestmentAndCashAndCashEquivalentsMember |
4,419us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = ptp_ShortTermInvestmentAndCashAndCashEquivalentsMember |
7,319us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = ptp_ShortTermInvestmentAndCashAndCashEquivalentsMember |
Funds Held By Ceding Companies [Member] |
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Net Investment Income [Abstract] |
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Investment income |
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$ 3,538us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = ptp_FundsHeldByCedingCompaniesMember |
$ 3,190us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = ptp_FundsHeldByCedingCompaniesMember |
$ 2,648us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = ptp_FundsHeldByCedingCompaniesMember |