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INVESTMENT OPERATIONS (Details 3) (USD $)
2 Months Ended 1 Months Ended 3 Months Ended
Mar. 31, 2015
Jan. 31, 2015
Mar. 31, 2014
Fixed maturities      
Investment operations      
Other-than-temporary impairments related to fixed maturities or equity securities that the Company intended to sell or expected to be required to sell $ 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
   
Equity securities      
Investment operations      
Other-than-temporary impairments related to fixed maturities or equity securities that the Company intended to sell or expected to be required to sell 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember
   
Predecessor      
Investment operations      
Other-than-temporary impairments of investments recorded   636,000us-gaap_MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
423,000us-gaap_MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Other-than-temporary impairments of investments recorded in earnings   481,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
1,591,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Other-than-temporary impairments of investments recorded in other comprehensive income (loss)   155,000pl_OtherThanTemporaryImpairmentsInOtherComprehensiveIncomeReclassificationBeforeTax
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
(1,168,000)pl_OtherThanTemporaryImpairmentsInOtherComprehensiveIncomeReclassificationBeforeTax
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Additional non-credit losses   100,000pl_OtherThanTemporaryImpairmentAdditionalAmountRecognizedInOtherComprehensiveIncome
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
Predecessor | Fixed maturities      
Investment operations      
Other-than-temporary impairments of investments recorded     400,000us-gaap_MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Other-than-temporary impairments related to fixed maturities or equity securities that the Company intended to sell or expected to be required to sell   0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Credit losses on fixed maturities      
Beginning balance   15,478,000us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
41,692,000us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Additions for previously impaired securities   221,000us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
474,000us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Reductions for previously impaired securities due to a change in expected cash flows     (21,327,000)us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsCashFlows
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Ending balance   15,699,000us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
20,839,000us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld
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= us-gaap_FixedMaturitiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Predecessor | Fixed income securities      
Investment operations      
Other-than-temporary impairments of investments recorded   600,000us-gaap_MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount
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= us-gaap_DebtSecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
Predecessor | Equity securities      
Investment operations      
Other-than-temporary impairments related to fixed maturities or equity securities that the Company intended to sell or expected to be required to sell   $ 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
$ 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember