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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, 2015
Dec. 31, 2014
Dec. 31, 2013
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]      
Balance at beginning of year $ 2,058,556 $ 2,426,652 $ 1,709,799
Costs deferred during the year: commissions 651,094 421,802 420,378
Costs deferred during the year: policy issue costs 6,545 5,080 5,422
Amortization (286,114) (163,578) (365,468)
Effect of net unrealized gains/losses 475,055 (631,400) 656,521
Balance at end of year $ 2,905,136 $ 2,058,556 $ 2,426,652