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Reserve For Losses, LAE And Future Policy Benefit Reserve (Summary Of Activity In The Reserve For Losses And LAE) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Reserve For Losses LAE And Future Policy Benefit Reserve [Abstract]    
Gross reserves at January 1 $ 13,119,090 $ 11,884,321
Less reinsurance recoverables (1,619,641) (1,212,649)
Net reserves at January 1 11,499,449 10,671,672
Incurred related to: Current year 1,050,116 5,264,327
Incurred related to: Prior years (1,566) 387,076
Total incurred losses and LAE 1,048,550 5,651,403
Paid related to: Current year 103,688 1,700,765
Paid related to: Prior years 817,006 3,011,175
Total paid losses and LAE 920,694 4,711,940
Foreign exchange/translation adjustment (1,496) (111,686)
Net reserves at December 31 11,625,810 11,499,449
Plus reinsurance recoverables 1,621,292 1,619,641
Gross reserves at December 31 $ 13,247,102 $ 13,119,090