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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Reserve For Losses, LAE And Future Policy Benefit Reserve [Abstract]      
Gross reserves beginning of period $ 16,322,143 $ 13,531,256 $ 13,098,158
Less reinsurance recoverables on unpaid losses (1,843,691) (1,640,712) (1,619,641)
Net reserves beginning of period 14,478,452 11,890,544 11,478,517
Incurred related to: Current year 7,400,303 6,149,410 4,986,456
Incurred related to: Prior years (9,050) 401,427 (63,558)
Total incurred losses and LAE 7,391,253 6,550,837 4,922,898
Paid related to: Current year 2,490,645 2,046,260 2,042,246
Paid related to: Prior years 2,226,457 2,077,613 2,519,950
Total paid losses and LAE 4,717,102 4,123,873 4,562,196
Foreign exchange/translation adjustment (89,481) 160,944 51,325
Net reserves end of period 17,063,121 14,478,452 11,890,544
Plus reinsurance recoverables on unpaid losses 1,946,365 1,843,691 1,640,712
Gross reserves end of period $ 19,009,486 $ 16,322,143 $ 13,531,256