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Investments (Changes in Net Unrealized Gains/Losses on Investments) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Investments [Abstract]      
Fixed maturity securities held for investment carried at amortized cost $ 0 $ 0 $ 581
Fixed maturity securities available for sale carried at fair value 1,955,496 3,549,007 (2,463,693)
Adjustment for effect on other balance sheet accounts:      
Deferred policy acquisition costs and deferred sales inducements (776,554) (1,586,537) 1,318,649
Deferred income tax asset/liability (247,578) (412,117) 240,459
Total adjustment for effect on other balance sheet accounts (1,024,132) (1,998,654) 1,559,108
Change in net unrealized gains/losses on investments carried at fair value $ 931,364 $ 1,550,353 $ (904,585)