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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Movement in Deferred Sales Inducements [Roll Forward]      
Balance at beginning of year $ 2,516,721 $ 2,001,892 $ 2,208,218
Costs deferred during the year 177,941 179,465 216,172
Amortization: Amortization (193,292) (243,666) (210,886)
Amortization: Impact of unlocking 104,707 21,465 34,274
Effect of net unrealized gains/losses (639,354) 557,565 (245,886)
Balance at end of year $ 1,966,723 $ 2,516,721 $ 2,001,892