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Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Financial Instruments where Carrying Amounts and Fair Values May Differ) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Assets        
Mortgage loans on real estate (net of valuation allowances) $ 2,913,486us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet $ 2,712,238us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet    
Policy loans 1,284,085us-gaap_LoansInsurancePolicy 1,284,284us-gaap_LoansInsurancePolicy    
Funds withheld at interest 5,841,554us-gaap_FundsHeldUnderReinsuranceAgreementsAsset 5,922,561us-gaap_FundsHeldUnderReinsuranceAgreementsAsset    
Cash and cash equivalents 1,083,179us-gaap_CashAndCashEquivalentsAtCarryingValue 1,645,669us-gaap_CashAndCashEquivalentsAtCarryingValue 1,127,132us-gaap_CashAndCashEquivalentsAtCarryingValue 923,647us-gaap_CashAndCashEquivalentsAtCarryingValue
Short-term investments 89,136us-gaap_OtherShortTermInvestments 97,694us-gaap_OtherShortTermInvestments    
Other invested assets 1,243,033us-gaap_OtherInvestments 1,198,319us-gaap_OtherInvestments    
Accrued investment income 283,665us-gaap_AccruedInvestmentIncomeReceivable 261,096us-gaap_AccruedInvestmentIncomeReceivable    
Liabilities        
Interest-sensitive contract liabilities 12,508,201us-gaap_GuaranteedInterestContracts 12,591,497us-gaap_GuaranteedInterestContracts    
Long-term debt 2,313,884us-gaap_LongTermDebt 2,314,293us-gaap_LongTermDebt    
Collateral finance and securitization notes 774,351us-gaap_SecuredDebt 782,701us-gaap_SecuredDebt    
Reported Value Measurement [Member]        
Assets        
Mortgage loans on real estate (net of valuation allowances) 2,913,486us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
2,712,238us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
   
Policy loans 1,284,085us-gaap_LoansInsurancePolicy
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
1,284,284us-gaap_LoansInsurancePolicy
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
   
Funds withheld at interest 5,815,835us-gaap_FundsHeldUnderReinsuranceAgreementsAsset
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
[1] 5,897,202us-gaap_FundsHeldUnderReinsuranceAgreementsAsset
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
[1]    
Cash and cash equivalents 706,671us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
[2] 745,823us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
[2]    
Short-term investments 29,205us-gaap_OtherShortTermInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
[2] 52,504us-gaap_OtherShortTermInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
[2]    
Other invested assets 458,423us-gaap_OtherInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
[2] 465,720us-gaap_OtherInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
[2]    
Accrued investment income 283,665us-gaap_AccruedInvestmentIncomeReceivable
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
261,096us-gaap_AccruedInvestmentIncomeReceivable
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
   
Liabilities        
Interest-sensitive contract liabilities 9,479,958us-gaap_GuaranteedInterestContracts
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
[1] 9,623,596us-gaap_GuaranteedInterestContracts
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
[1]    
Long-term debt 2,313,884us-gaap_LongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
     
Debt, Long-term and Short-term, Combined Amount   2,314,293us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
   
Collateral finance and securitization notes 774,351us-gaap_SecuredDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
782,701us-gaap_SecuredDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
   
Estimate of Fair Value Measurement [Member]        
Assets        
Mortgage loans on real estate (net of valuation allowances) 3,053,041us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
2,803,942us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Policy loans 1,284,085us-gaap_LoansInsurancePolicy
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
1,284,284us-gaap_LoansInsurancePolicy
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Funds withheld at interest 6,305,645us-gaap_FundsHeldUnderReinsuranceAgreementsAsset
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[1] 6,367,165us-gaap_FundsHeldUnderReinsuranceAgreementsAsset
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[1]    
Cash and cash equivalents 706,671us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[2] 745,823us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[2]    
Short-term investments 29,205us-gaap_OtherShortTermInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[2] 52,504us-gaap_OtherShortTermInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[2]    
Other invested assets 510,287us-gaap_OtherInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[2] 518,261us-gaap_OtherInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[2]    
Accrued investment income 283,665us-gaap_AccruedInvestmentIncomeReceivable
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
261,096us-gaap_AccruedInvestmentIncomeReceivable
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Liabilities        
Interest-sensitive contract liabilities 9,830,871us-gaap_GuaranteedInterestContracts
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[1] 9,666,240us-gaap_GuaranteedInterestContracts
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[1]    
Long-term Debt, Fair Value 2,527,728us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
     
Debt, Long-term and Short-term, Combined Amount   2,518,399us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Collateral finance and securitization notes 684,719us-gaap_SecuredDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
674,984us-gaap_SecuredDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Estimate of Fair Value Measurement [Member] | Fair Value Inputs Level 1 Member        
Assets        
Mortgage loans on real estate (net of valuation allowances) 0us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
0us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Policy loans 0us-gaap_LoansInsurancePolicy
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
0us-gaap_LoansInsurancePolicy
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Funds withheld at interest 0us-gaap_FundsHeldUnderReinsuranceAgreementsAsset
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[1] 0us-gaap_FundsHeldUnderReinsuranceAgreementsAsset
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[1]    
Cash and cash equivalents 706,671us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[2] 745,823us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[2]    
Short-term investments 29,205us-gaap_OtherShortTermInvestments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[2] 52,504us-gaap_OtherShortTermInvestments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[2]    
Other invested assets 4,637us-gaap_OtherInvestments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[2] 4,674us-gaap_OtherInvestments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[2]    
Accrued investment income 0us-gaap_AccruedInvestmentIncomeReceivable
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
0us-gaap_AccruedInvestmentIncomeReceivable
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Liabilities        
Interest-sensitive contract liabilities 0us-gaap_GuaranteedInterestContracts
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[1] 0us-gaap_GuaranteedInterestContracts
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[1]    
Long-term Debt, Fair Value 0us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
     
Debt, Long-term and Short-term, Combined Amount   0us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Collateral finance and securitization notes 0us-gaap_SecuredDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
0us-gaap_SecuredDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Estimate of Fair Value Measurement [Member] | Fair Value Inputs Level 2 Member        
Assets        
Mortgage loans on real estate (net of valuation allowances) 0us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
0us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Policy loans 1,284,085us-gaap_LoansInsurancePolicy
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
1,284,284us-gaap_LoansInsurancePolicy
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Funds withheld at interest 0us-gaap_FundsHeldUnderReinsuranceAgreementsAsset
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[1] 0us-gaap_FundsHeldUnderReinsuranceAgreementsAsset
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[1]    
Cash and cash equivalents 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[2] 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[2]    
Short-term investments 0us-gaap_OtherShortTermInvestments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[2] 0us-gaap_OtherShortTermInvestments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[2]    
Other invested assets 35,446us-gaap_OtherInvestments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[2] 35,446us-gaap_OtherInvestments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[2]    
Accrued investment income 283,665us-gaap_AccruedInvestmentIncomeReceivable
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
261,096us-gaap_AccruedInvestmentIncomeReceivable
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Liabilities        
Interest-sensitive contract liabilities 0us-gaap_GuaranteedInterestContracts
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[1] 0us-gaap_GuaranteedInterestContracts
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= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
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[1]    
Long-term Debt, Fair Value 0us-gaap_LongTermDebtFairValue
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Debt, Long-term and Short-term, Combined Amount   0us-gaap_DebtLongtermAndShorttermCombinedAmount
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Collateral finance and securitization notes 0us-gaap_SecuredDebt
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0us-gaap_SecuredDebt
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= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Estimate of Fair Value Measurement [Member] | Fair Value Inputs Level 3 Member        
Assets        
Mortgage loans on real estate (net of valuation allowances) 3,053,041us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember
2,803,942us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
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= us-gaap_FairValueInputsLevel3Member
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Policy loans 0us-gaap_LoansInsurancePolicy
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0us-gaap_LoansInsurancePolicy
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Funds withheld at interest 6,305,645us-gaap_FundsHeldUnderReinsuranceAgreementsAsset
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= us-gaap_FairValueInputsLevel3Member
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[1] 6,367,165us-gaap_FundsHeldUnderReinsuranceAgreementsAsset
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= us-gaap_FairValueInputsLevel3Member
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[1]    
Cash and cash equivalents 0us-gaap_CashAndCashEquivalentsAtCarryingValue
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[2] 0us-gaap_CashAndCashEquivalentsAtCarryingValue
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= us-gaap_FairValueInputsLevel3Member
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[2]    
Short-term investments 0us-gaap_OtherShortTermInvestments
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= us-gaap_FairValueInputsLevel3Member
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[2] 0us-gaap_OtherShortTermInvestments
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= us-gaap_FairValueInputsLevel3Member
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[2]    
Other invested assets 470,204us-gaap_OtherInvestments
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= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[2] 478,141us-gaap_OtherInvestments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[2]    
Accrued investment income 0us-gaap_AccruedInvestmentIncomeReceivable
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= us-gaap_FairValueInputsLevel3Member
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0us-gaap_AccruedInvestmentIncomeReceivable
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= us-gaap_FairValueInputsLevel3Member
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Liabilities        
Interest-sensitive contract liabilities 9,830,871us-gaap_GuaranteedInterestContracts
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[1] 9,666,240us-gaap_GuaranteedInterestContracts
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[1]    
Long-term Debt, Fair Value 2,527,728us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
     
Debt, Long-term and Short-term, Combined Amount   2,518,399us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Collateral finance and securitization notes $ 684,719us-gaap_SecuredDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
$ 674,984us-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 condensed 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 condensed consolidated balance sheets because certain items within the respective financial statement caption are measured at fair value on a recurring basis.