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CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues
Net premiums	$ 8,669,854us-gaap_PremiumsEarnedNet	$ 8,254,027us-gaap_PremiumsEarnedNet	$ 7,906,596us-gaap_PremiumsEarnedNet
Investment income, net of related expenses	1,713,691us-gaap_NetInvestmentIncome	1,699,865us-gaap_NetInvestmentIncome	1,436,206us-gaap_NetInvestmentIncome
Investment related gains (losses), net:
Other-than-temporary impairments on fixed maturity securities	(7,766)us-gaap_MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount	(12,654)us-gaap_MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount	(15,908)us-gaap_MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount
Other-than-temporary impairments on fixed maturity securities transferred to (from) accumulated other comprehensive income	0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities	(247)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities	(7,618)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities
Other investment related gains (losses), net	193,959us-gaap_GainLossOnSaleOfOtherInvestments	76,891us-gaap_GainLossOnSaleOfOtherInvestments	277,662us-gaap_GainLossOnSaleOfOtherInvestments
Total investment related gains (losses), net	186,193us-gaap_GainLossOnInvestments	63,990us-gaap_GainLossOnInvestments	254,136us-gaap_GainLossOnInvestments
Other revenues	334,456us-gaap_OtherIncome	300,471us-gaap_OtherIncome	243,973us-gaap_OtherIncome
Total revenues	10,904,194us-gaap_Revenues	10,318,353us-gaap_Revenues	9,840,911us-gaap_Revenues
Benefits and expenses
Claims and other policy benefits	7,406,641us-gaap_PolicyholderBenefitsAndClaimsIncurredNet	7,304,332us-gaap_PolicyholderBenefitsAndClaimsIncurredNet	6,665,999us-gaap_PolicyholderBenefitsAndClaimsIncurredNet
Interest credited	451,031us-gaap_InterestCreditedToPolicyholdersAccountBalances	476,514us-gaap_InterestCreditedToPolicyholdersAccountBalances	379,915us-gaap_InterestCreditedToPolicyholdersAccountBalances
Policy acquisition costs and other insurance expenses	1,391,433rga_PolicyAcquisitionCostsAndOtherInsuranceExpenses	1,300,780rga_PolicyAcquisitionCostsAndOtherInsuranceExpenses	1,306,470rga_PolicyAcquisitionCostsAndOtherInsuranceExpenses
Other operating expenses	538,415us-gaap_OtherCostAndExpenseOperating	466,717us-gaap_OtherCostAndExpenseOperating	451,759us-gaap_OtherCostAndExpenseOperating
Interest expense	96,700us-gaap_InterestExpense	124,307us-gaap_InterestExpense	105,348us-gaap_InterestExpense
Collateral finance and securitization expense	11,441rga_CollateralFinancingExpense	10,449rga_CollateralFinancingExpense	12,197rga_CollateralFinancingExpense
Total benefits and expenses	9,895,661us-gaap_BenefitsLossesAndExpenses	9,683,099us-gaap_BenefitsLossesAndExpenses	8,921,688us-gaap_BenefitsLossesAndExpenses
Income before income taxes	1,008,533us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	635,254us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	919,223us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Provision for income taxes	324,486us-gaap_IncomeTaxExpenseBenefit	216,417us-gaap_IncomeTaxExpenseBenefit	287,330us-gaap_IncomeTaxExpenseBenefit
Net income	$ 684,047us-gaap_NetIncomeLoss	$ 418,837us-gaap_NetIncomeLoss	$ 631,893us-gaap_NetIncomeLoss
Earnings per share
Basic earnings per share (in dollars per share)	$ 9.88us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 5.82us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 8.57us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Diluted earnings per share (in dollars per share)	$ 9.78us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 5.78us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 8.52us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Dividends declared per share	$ 1.26us-gaap_CommonStockDividendsPerShareDeclared	$ 1.08us-gaap_CommonStockDividendsPerShareDeclared	$ 0.84us-gaap_CommonStockDividendsPerShareDeclared

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