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Derivative Instruments (Credit Exposure of Derivative Contracts) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Credit Exposure of Derivative Contracts    
Estimated fair value of derivatives in net asset (liability) position $ 230,557us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet $ 175,209us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
Derivative, Collateral, Right to Reclaim Cash 5,120us-gaap_DerivativeCollateralRightToReclaimCash [1] 0us-gaap_DerivativeCollateralRightToReclaimCash [1]
Derivative Liability, Fair Value of Collateral 55,397us-gaap_DerivativeLiabilityFairValueOfCollateral [2] 47,222us-gaap_DerivativeLiabilityFairValueOfCollateral [2]
Derivative, Collateral, Obligation to Return Cash (219,016)us-gaap_DerivativeCollateralObligationToReturnCash [3] (178,141)us-gaap_DerivativeCollateralObligationToReturnCash [3]
Derivative Asset, Fair Value of Collateral (24,514)us-gaap_DerivativeAssetFairValueOfCollateral [4] (20,260)us-gaap_DerivativeAssetFairValueOfCollateral [4]
Deposits with Clearing Organizations and Others, Securities (31,291)us-gaap_DepositsWithClearingOrganizationsAndOthersSecurities (16,333)us-gaap_DepositsWithClearingOrganizationsAndOthersSecurities
Net credit exposure 16,253rga_NetCreditExposureOnDerivativeContracts 7,697rga_NetCreditExposureOnDerivativeContracts
Margin account related to exchange-traded futures $ 6,267us-gaap_MarginDepositAssets [5] $ 7,976us-gaap_MarginDepositAssets [5]
[1] Consists of receivable from counterparty, included in other assets.
[2] Included in available-for-sale securities, primarily consists of U.S. Treasury securities.
[3] Included in cash and cash equivalents, with obligation to return cash collateral recorded in other liabilities.
[4] Consists of U.S. Treasury securities.
[5] Included in cash and cash equivalents.