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Deferred Policy Acquisition Costs (Movement Analysis Of 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]      
Deferred Policy Acquisition Costs $ 3,239,824 $ 3,338,605 $ 3,392,437
Deferred Policy Acquisition Costs, Additions 607,743 348,470 350,233
Deferred Policy Acquisition Costs, Amortization Expense (437,696) (432,474) (341,115)
Deferred Policy Acquisition Cost, Amortization Expense, Other 14,658 (70,392) (40,077)
Deferred Policy Acquisition Cost, Amortization Expense, Unrealized Investment Gains (Losses) 26,608 (8,220) (3,541)
Deferred Policy Acquisition Cost, Foreign Currency Translation Adjustment (53,367) 63,835 (19,332)
Deferred Policy Acquisition Costs $ 3,397,770 $ 3,239,824 $ 3,338,605