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Deferred Policy Acquisition Costs (Movement Analysis Of 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]      
Deferred Policy Acquisition Costs $ 3,342,575 $ 3,517,796 $ 3,619,274
Deferred Policy Acquisition Costs, Additions 352,260 877,609 854,163
Deferred Policy Acquisition Cost, Amortization Expense (288,630) (867,621) (814,662)
Deferred Policy Acquisition Cost, Amortization Expense, Other 58,754 (111,744) (98,141)
Deferred Policy Acquisition Cost, Amortization Expense, Unrealized Investment Gains (Losses) 17,510 (4,480) 16,181
Deferred Policy Acquisition Cost, Foreign Currency Translation Adjustment (90,032) (68,985) (59,019)
Deferred Policy Acquisition Costs $ 3,392,437 $ 3,342,575 $ 3,517,796