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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]      
Balance at beginning of year $ 2,714,523 $ 2,905,377 $ 2,905,136
Costs deferred during the year: commissions 384,432 401,124 538,863
Costs deferred during the year: policy issue costs 3,790 5,517 4,462
Amortization: Amortization (358,563) (304,162) (325,848)
Amortization: Impact of unlocking 30,572 48,198 (48,164)
Effect of net unrealized gains/losses 761,084 (341,531) (169,072)
Balance at end of year $ 3,535,838 $ 2,714,523 $ 2,905,377
Assumptions, revision to extend period of time related to investment spread targets     2 years