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Deferred Policy Acquisition Costs, Deferred Sales Inducements and Liability for Lifetime Income Benefit Riders (Deferred Policy Acquisition Costs) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]      
Balance at beginning of year $ 2,225,199 $ 3,033,649 $ 3,529,855
Costs deferred during the year: commissions 303,192 251,428 419,166
Costs deferred during the year: policy issue costs 4,665 3,725 3,351
Amortization: Amortization (313,990) (2,769) (280,699)
Amortization: Impact of unlocking 45,662 (646,785) 192,982
Effect of net unrealized gains/losses 299,478 (414,049) (831,006)
Write-off related to in-force ceded reinsurance (341,437) 0 0
Balance at end of year $ 2,222,769 $ 2,225,199 $ 3,033,649