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Employee Benefit Plans (Components of Net Periodic Benefit Cost Recognized in Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax $ (10,587) $ 4,427 $ 4,618
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax (11,717) (444) (337)
Pension Plans, Defined Benefit [Member]      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Defined Benefit Plan, Service Cost 10,686 10,319 9,222
Defined Benefit Plan, Interest Cost 5,326 4,790 5,035
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (6,215) (5,138) (4,897)
Defined Benefit Plan, Amortization of Gain (Loss) 4,382 4,323 3,429
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 344 294 309
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement (4,785) (1,026) 0
Defined Benefit Plan, Net Periodic Benefit Cost, Total 19,308 15,614 13,098
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax 2,633 8,785 5,774
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax (4,382) (4,323) (3,429)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax (344) (294) (309)
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax (4,785) (1,026) 0
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment [2] 159 [1] 0 [1] 0
Other Comprehensive Income Defined Benefit Plan Net Foreign Exchange Translations And Other Adjustments 759 707 (1,797)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax (5,960) 3,849 239
Defined Benefit Plan Net Periodic Benefit Cost And Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Period Increase Decrease 13,348 19,463 13,337
Other Postretirement Benefit Plans, Defined Benefit [Member]      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Defined Benefit Plan, Service Cost 2,543 2,883 4,062
Defined Benefit Plan, Interest Cost 2,118 2,259 2,572
Defined Benefit Plan, Expected Return (Loss) on Plan Assets 0 0 0
Defined Benefit Plan, Amortization of Gain (Loss) 1,992 1,827 2,465
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) (1,315) (622) 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement 0 0 0
Defined Benefit Plan, Net Periodic Benefit Cost, Total 5,338 6,347 9,099
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax 5,507 6,228 (2,729)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax (1,992) (1,827) (2,465)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax 1,315 622 0
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax 0 0 0
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment [2] 0 [1] (13,743) [1] 0
Other Comprehensive Income Defined Benefit Plan Net Foreign Exchange Translations And Other Adjustments 0 0 0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax 4,830 (8,720) (5,194)
Defined Benefit Plan Net Periodic Benefit Cost And Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Period Increase Decrease $ 10,168 $ (2,373) $ 3,905
[1] Reflects effect of the amendment to RGA’s U.S. retiree health care benefit plan announced in 2016, effective January 1, 2017 and other administrative amendments to the pension plans. The amounts were recorded in AOCI and will be amortized through prior service cost.
[2] Reflects effect of the amendment to RGA’s U.S. retiree health care benefit plan announced in 2016, effective January 1, 2017 and other administrative amendments to the pension plans. The amounts were recorded in AOCI and will be amortized through prior service cost.