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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Movement in Deferred Sales Inducements [Roll Forward]      
Balance at beginning of year $ 1,448,375 $ 2,042,060 $ 2,512,590
Costs deferred during the year 95,160 93,610 177,941
Amortization: Amortization (197,799) (10,063) (193,292)
Amortization: Impact of unlocking 45,107 (428,101) 104,707
Effect of net unrealized gains/losses 155,230 (249,131) (559,886)
Balance at end of year $ 1,546,073 $ 1,448,375 $ 2,042,060