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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Movement in Deferred Sales Inducements [Roll Forward]      
Balance at beginning of year $ 1,546,073 $ 1,448,375 $ 2,042,060
Costs deferred during the year 107,691 95,160 93,610
Amortization: Amortization (362,866) (197,799) (10,063)
Amortization: Impact of unlocking (45,682) 45,107 (428,101)
Effect of net unrealized gains/losses 1,348,134 155,230 (249,131)
Balance at end of year $ 2,593,350 $ 1,546,073 $ 1,448,375