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Investments (Amortized Cost and Fair Value of Fixed Maturities by Contractual Maturities) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Available For Sale Securities Debt Maturities Amortized Cost    
Due in one year or less $ 594,886us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost  
Due after one year through five years 4,504,020us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost  
Due after five year through ten years 7,388,162us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost  
Due after ten years 6,842,978us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost  
Asset and mortgage-backed securities 3,603,670us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost  
Total 22,933,716us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis 23,105,597us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Available For Sale Securities Debt Maturities Fair Value    
Due in one year or less 600,953us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue  
Due after one year through five years 4,771,660us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
Due after five year through ten years 7,862,501us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue  
Due after ten years 8,806,049us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue  
Asset and mortgage-backed securities 3,760,060us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue  
Total $ 25,801,223us-gaap_AvailableForSaleSecuritiesDebtSecurities $ 25,480,972us-gaap_AvailableForSaleSecuritiesDebtSecurities