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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
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reserve For Losses LAE And Future Policy Benefit Reserve [Abstract]      
Gross reserves beginning of period $ 13,611,313 $ 13,119,090 $ 11,884,321
Less reinsurance recoverables (1,640,712) (1,619,641) (1,212,649)
Net reserves beginning of period 11,970,601 11,499,449 10,671,672
Incurred related to: Current year 6,149,410 4,986,456 5,264,327
Incurred related to: Prior years 401,427 (63,558) 387,076
Total incurred losses and LAE 6,550,837 4,922,898 5,651,403
Paid related to: Current year 2,046,260 2,042,246 1,700,765
Paid related to: Prior years 2,080,816 2,460,825 3,011,175
Total paid losses and LAE 4,127,076 4,503,071 4,711,940
Foreign exchange/translation adjustment 160,944 51,325 (111,686)
Net reserves end of period 14,555,306 11,970,601 11,499,449
Plus reinsurance recoverables 1,843,691 1,640,712 1,619,641
Gross reserves end of period $ 16,398,997 $ 13,611,313 $ 13,119,090