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Deferred Policy Acquisition Costs and Deferred Sales Inducements (Deferred Policy Acquisition Costs) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]      
Balance at beginning of year $ 2,905,136 $ 2,058,556 $ 2,426,652
Costs deferred during the year: commissions 538,863 651,094 421,802
Costs deferred during the year: policy issue costs 4,462 6,545 5,080
Amortization (374,012) (286,114) (163,578)
Effect of net unrealized gains/losses (169,072) 475,055 (631,400)
Balance at end of year $ 2,905,377 $ 2,905,136 $ 2,058,556