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Fair Value of Assets and Liabilities (Financial Instruments where Carrying Amounts and Fair Values May Differ) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]        
Mortgage loans on real estate $ 2,712,238us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet $ 2,486,680us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet    
Policy loans 1,284,284us-gaap_LoansInsurancePolicy 1,244,469us-gaap_LoansInsurancePolicy    
Funds withheld at interest 5,922,561us-gaap_FundsHeldUnderReinsuranceAgreementsAsset 5,771,467us-gaap_FundsHeldUnderReinsuranceAgreementsAsset    
Cash and cash equivalents 1,645,669us-gaap_CashAndCashEquivalentsAtCarryingValue 923,647us-gaap_CashAndCashEquivalentsAtCarryingValue 1,259,892us-gaap_CashAndCashEquivalentsAtCarryingValue 962,870us-gaap_CashAndCashEquivalentsAtCarryingValue
Short-term investments 97,694us-gaap_OtherShortTermInvestments 139,395us-gaap_OtherShortTermInvestments    
Other invested assets 1,198,319us-gaap_OtherInvestments 1,324,960us-gaap_OtherInvestments    
Accrued investment income 261,096us-gaap_AccruedInvestmentIncomeReceivable 267,908us-gaap_AccruedInvestmentIncomeReceivable    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]        
Interest-sensitive contract liabilities 12,591,497us-gaap_GuaranteedInterestContracts 12,947,557us-gaap_GuaranteedInterestContracts    
Collateral finance and securitization notes 782,701us-gaap_SecuredDebt 484,752us-gaap_SecuredDebt    
Carrying Value [Member]        
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]        
Mortgage loans on real estate 2,712,238us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 2,486,680us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		    
Policy loans 1,284,284us-gaap_LoansInsurancePolicy
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 1,244,469us-gaap_LoansInsurancePolicy
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		    
Funds withheld at interest 5,897,202us-gaap_FundsHeldUnderReinsuranceAgreementsAsset
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 [1] 5,948,374us-gaap_FundsHeldUnderReinsuranceAgreementsAsset
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 [1]    
Cash and cash equivalents 745,823us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 [2] 552,302us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 [2]    
Short-term investments 52,504us-gaap_OtherShortTermInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 [2] 27,823us-gaap_OtherShortTermInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 [2]    
Other invested assets 465,720us-gaap_OtherInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 [2] 491,545us-gaap_OtherInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 [2]    
Accrued investment income 261,096us-gaap_AccruedInvestmentIncomeReceivable
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 267,908us-gaap_AccruedInvestmentIncomeReceivable
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]        
Interest-sensitive contract liabilities 9,623,596us-gaap_GuaranteedInterestContracts
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 [1] 10,228,120us-gaap_GuaranteedInterestContracts
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 [1]    
Long And Short Term Debt 2,314,293us-gaap_DebtLongtermAndShorttermCombinedAmount
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= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 2,214,350us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		    
Collateral finance and securitization notes 782,701us-gaap_SecuredDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 484,752us-gaap_SecuredDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		    
Estimate of Fair Value Measurement [Member]        
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]        
Mortgage loans on real estate 2,803,942us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 2,489,721us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		    
Policy loans 1,284,284us-gaap_LoansInsurancePolicy
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 1,244,469us-gaap_LoansInsurancePolicy
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember		    
Funds withheld at interest 6,367,165us-gaap_FundsHeldUnderReinsuranceAgreementsAsset
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 [1] 6,207,342us-gaap_FundsHeldUnderReinsuranceAgreementsAsset
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 [1]    
Cash and cash equivalents 745,823us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 [2] 552,302us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 [2]    
Short-term investments 52,504us-gaap_OtherShortTermInvestments
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 [2] 27,823us-gaap_OtherShortTermInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 [2]    
Other invested assets 518,261us-gaap_OtherInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 [2] 534,442us-gaap_OtherInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 [2]    
Accrued investment income 261,096us-gaap_AccruedInvestmentIncomeReceivable
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 267,908us-gaap_AccruedInvestmentIncomeReceivable
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]        
Interest-sensitive contract liabilities 9,666,240us-gaap_GuaranteedInterestContracts
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 [1] 9,989,514us-gaap_GuaranteedInterestContracts
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 [1]    
Long And Short Term Debt 2,518,399us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 2,333,023us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		    
Collateral finance and securitization notes 674,984us-gaap_SecuredDebt
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 374,984us-gaap_SecuredDebt
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember		    
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]        
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]        
Mortgage loans on real estate 0us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
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Policy loans 0us-gaap_LoansInsurancePolicy
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Funds withheld at interest 0us-gaap_FundsHeldUnderReinsuranceAgreementsAsset
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 [1]    
Cash and cash equivalents 745,823us-gaap_CashAndCashEquivalentsAtCarryingValue
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= us-gaap_FairValueInputsLevel1Member
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= us-gaap_FairValueInputsLevel1Member
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 [2]    
Short-term investments 52,504us-gaap_OtherShortTermInvestments
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= us-gaap_FairValueInputsLevel1Member
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 [2] 27,823us-gaap_OtherShortTermInvestments
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= us-gaap_FairValueInputsLevel1Member
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 [2]    
Other invested assets 4,674us-gaap_OtherInvestments
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 [2] 5,070us-gaap_OtherInvestments
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Accrued investment income 0us-gaap_AccruedInvestmentIncomeReceivable
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Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]        
Interest-sensitive contract liabilities 0us-gaap_GuaranteedInterestContracts
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Long And Short Term Debt 0us-gaap_DebtLongtermAndShorttermCombinedAmount
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Collateral finance and securitization notes 0us-gaap_SecuredDebt
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Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]        
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]        
Mortgage loans on real estate 0us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
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Policy loans 1,284,284us-gaap_LoansInsurancePolicy
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Funds withheld at interest 0us-gaap_FundsHeldUnderReinsuranceAgreementsAsset
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Cash and cash equivalents 0us-gaap_CashAndCashEquivalentsAtCarryingValue
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Short-term investments 0us-gaap_OtherShortTermInvestments
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Other invested assets 35,446us-gaap_OtherInvestments
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Accrued investment income 261,096us-gaap_AccruedInvestmentIncomeReceivable
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Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]        
Interest-sensitive contract liabilities 0us-gaap_GuaranteedInterestContracts
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Long And Short Term Debt 0us-gaap_DebtLongtermAndShorttermCombinedAmount
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Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]        
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]        
Mortgage loans on real estate 2,803,942us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 [1]    
Long And Short Term Debt 2,518,399us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 2,333,023us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		    
Collateral finance and securitization notes $ 674,984us-gaap_SecuredDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 $ 374,984us-gaap_SecuredDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		    
[1] Carrying values presented herein differ from those presented in the consolidated balance sheets because certain items within the respective financial statement caption are embedded derivatives and are measured at fair value on a recurring basis.
[2] Carrying values presented herein differ from those presented in the consolidated balance sheets because certain items within the respective financial statement caption are measured at fair value on a recurring basis.