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Deferred Policy Acquisition Costs (Movement Analysis Of 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]      
Deferred Policy Acquisition Costs $ 3,338,605 $ 3,392,437 $ 3,342,575
Deferred Policy Acquisition Costs, Additions 348,470 350,233 352,260
Deferred Policy Acquisition Costs, Amortization Expense (432,474) (341,115) (288,630)
Deferred Policy Acquisition Cost, Amortization Expense, Other (70,392) (40,077) 58,754
Deferred Policy Acquisition Cost, Amortization Expense, Unrealized Investment Gains (Losses) (8,220) (3,541) 17,510
Deferred Policy Acquisition Cost, Foreign Currency Translation Adjustment 63,835 (19,332) (90,032)
Deferred Policy Acquisition Costs $ 3,239,824 $ 3,338,605 $ 3,392,437