CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Revenues:
Net premiums	$ 2,023,852us-gaap_PremiumsEarnedNet	$ 2,100,637us-gaap_PremiumsEarnedNet
Investment income, net of related expenses	426,891us-gaap_NetInvestmentIncome	404,375us-gaap_NetInvestmentIncome
Investment related gains (losses), net:
Other-than-temporary impairments on fixed maturity securities	(2,527)	(303)
Other-than-temporary impairments on fixed maturity securities transferred to (from) accumulated other comprehensive income	0	0
Other investment related gains (losses), net	10,110	84,874
Total investment related gains (losses), net	7,583us-gaap_GainLossOnInvestments	84,571us-gaap_GainLossOnInvestments
Other revenues	62,287us-gaap_OtherIncome	67,590us-gaap_OtherIncome
Total revenues	2,520,613us-gaap_Revenues	2,657,173us-gaap_Revenues
Benefits and Expenses:
Claims and other policy benefits	1,775,451	1,843,677
Interest credited	120,678	110,594
Policy acquisition costs and other insurance expenses	277,043	354,873
Other operating expenses	121,618us-gaap_OtherCostAndExpenseOperating	110,936us-gaap_OtherCostAndExpenseOperating
Interest expense	35,627us-gaap_InterestExpense	35,084us-gaap_InterestExpense
Collateral finance and securitization expense	6,071rga_CollateralFinancingExpense	2,569rga_CollateralFinancingExpense
Total benefits and expenses	2,336,488us-gaap_BenefitsLossesAndExpenses	2,457,733us-gaap_BenefitsLossesAndExpenses
Income before income taxes	184,125	199,440
Provision for income taxes	59,011us-gaap_IncomeTaxExpenseBenefit	62,776us-gaap_IncomeTaxExpenseBenefit
Net income	$ 125,114us-gaap_NetIncomeLoss	$ 136,664us-gaap_NetIncomeLoss
Earnings per share:
Basic earnings per share	$ 1.84us-gaap_EarningsPerShareBasic	$ 1.94us-gaap_EarningsPerShareBasic
Diluted earnings per share	$ 1.81us-gaap_EarningsPerShareDiluted	$ 1.92us-gaap_EarningsPerShareDiluted
Dividends declared per share	$ 0.33	$ 0.30

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Policy Acquisition Costs And Other Insurance Expenses

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Interest allocated to policyholders holding contracts under which the insurer must provide a guaranteed yield.

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