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Investments (Investment Related Gains (Losses) Net) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Available-for-sale Securities [Abstract]      
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net $ 7,766us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet $ 12,901us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet $ 23,526us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
Impairment Losses On Equity Securities 0rga_ImpairmentLossesOnEquitySecurities 0rga_ImpairmentLossesOnEquitySecurities (3,025)rga_ImpairmentLossesOnEquitySecurities
Available-for-sale Securities, Gross Realized Gains 65,435us-gaap_AvailableForSaleSecuritiesGrossRealizedGains 82,744us-gaap_AvailableForSaleSecuritiesGrossRealizedGains 145,268us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Available-for-sale Securities, Gross Realized Losses (31,295)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses (60,575)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses (27,474)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
Other Impairment Losses And Change In Mortgage Loan Provision (5,315)rga_OtherImpairmentLossesAndChangeInMortgageLoanProvision (6,933)rga_OtherImpairmentLossesAndChangeInMortgageLoanProvision (16,602)rga_OtherImpairmentLossesAndChangeInMortgageLoanProvision
Derivatives And Other Investments Net 165,134rga_DeriviativesAndOtherInvestmentsNet 61,655rga_DeriviativesAndOtherInvestmentsNet 179,495rga_DeriviativesAndOtherInvestmentsNet
Realized Investment Gains (Losses) $ 186,193us-gaap_RealizedInvestmentGainsLosses $ 63,990us-gaap_RealizedInvestmentGainsLosses $ 254,136us-gaap_RealizedInvestmentGainsLosses