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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 4) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Goodwill      
Goodwill, Impairment Loss $ 0us-gaap_GoodwillImpairmentLoss    
Goodwill. 102,365,000us-gaap_Goodwill 105,463,000us-gaap_Goodwill 108,561,000us-gaap_Goodwill
Guaranteed minimum withdrawal benefits (GMWB) | Annuity account      
Guaranteed Minimum Withdrawal Benefits      
Guaranteed benefit asset, net $ 245,100,000pl_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteedBenefitAssetNet
/ us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumWithdrawalBenefitMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
   
Guaranteed minimum withdrawal benefits (GMWB) | Annuity account | Minimum      
Guaranteed Minimum Withdrawal Benefits      
Mortality rate assumed (as a percent) 44.50%us-gaap_LongDurationContractsAssumptionsByProductAndGuaranteeMortalityRate
/ us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumWithdrawalBenefitMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Guaranteed minimum withdrawal benefits (GMWB) | Annuity account | Maximum      
Guaranteed Minimum Withdrawal Benefits      
Mortality rate assumed (as a percent) 100.00%us-gaap_LongDurationContractsAssumptionsByProductAndGuaranteeMortalityRate
/ us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumWithdrawalBenefitMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember