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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]      
Balance at beginning of year $ 2,923,454 $ 3,535,838 $ 2,714,523
Costs deferred during the year: commissions 251,429 419,165 384,432
Costs deferred during the year: policy issue costs 3,725 3,351 3,790
Amortization: Amortization (2,769) (280,699) (358,563)
Amortization: Impact of unlocking (646,785) 192,982 30,572
Effect of net unrealized gains/losses (483,242) (947,183) 761,084
Balance at end of year $ 2,045,812 $ 2,923,454 $ 3,535,838