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Investments (Changes in Net Unrealized Gains/Losses on Investments) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Investments [Abstract]      
Fixed maturity securities available for sale carried at fair value $ (987,434) $ 1,955,496 $ 3,549,007
Adjustment for effect on other balance sheet accounts:      
Deferred policy acquisition costs, deferred sales inducements and policy benefit reserves 542,382 (880,517) (1,775,474)
Deferred income tax asset/liability 90,284 (225,746) (372,472)
Total adjustment for effect on other balance sheet accounts 632,666 (1,106,263) (2,147,946)
Change in net unrealized gains/losses on investments carried at fair value $ (354,768) $ 849,233 $ 1,401,061