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Deferred Policy Acquisition Costs, Deferred Sales Inducements and Liability for Lifetime Income Benefit Riders (Deferred Sales Inducements) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Movement in Deferred Sales Inducements [Roll Forward]      
Balance at beginning of year $ 1,966,723 $ 2,516,721 $ 2,001,892
Costs deferred during the year 93,610 177,941 179,465
Amortization: Amortization (10,063) (193,292) (243,666)
Amortization: Impact of unlocking (428,101) 104,707 21,465
Effect of net unrealized gains/losses (293,312) (639,354) 557,565
Balance at end of year $ 1,328,857 $ 1,966,723 $ 2,516,721