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Deferred Policy Acquisition Costs, Deferred Sales Inducements and Lifetime Income Benefit Rider Reserves (Deferred Policy Acquisition Costs) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]      
Balance at beginning of year $ 2,905,377 $ 2,905,136 $ 2,058,556
Costs deferred during the year: commissions 401,124 538,863 651,094
Costs deferred during the year: policy issue costs 5,517 4,462 6,545
Amortization (255,964) (374,012) (286,114)
Effect of net unrealized gains/losses (341,531) (169,072) 475,055
Balance at end of year $ 2,714,523 $ 2,905,377 $ 2,905,136