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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
Mar. 31, 2020
Mar. 31, 2019
Reserve For Losses, LAE And Future Policy Benefit Reserve [Abstract]    
Gross reserves beginning of period $ 13,611,313 $ 13,119,090
Less reinsurance recoverables (1,640,712) (1,619,641)
Net reserves beginning of period 11,970,601 11,499,449
Incurred related to: Current year 1,433,440 1,050,116
Incurred related to: Prior years (2,600) (1,566)
Total incurred losses and LAE 1,430,840 1,048,550
Paid related to: Current year 168,528 103,688
Paid related to: Prior years 907,790 817,006
Total paid losses and LAE 1,076,318 920,694
Foreign exchange/translation adjustment (156,565) (1,496)
Net reserves end of period 12,168,558 11,625,810
Plus reinsurance recoverables 1,651,946 1,621,292
Gross reserves end of period $ 13,820,504 $ 13,247,102