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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
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Reserve For Losses, LAE And Future Policy Benefit Reserve [Abstract]    
Gross reserves beginning of period $ 16,398,997 $ 13,611,313
Less reinsurance recoverables on unpaid losses (1,843,691) (1,640,712)
Net reserves beginning of period 14,555,306 11,970,601
Incurred related to: Current year 5,577,911 4,572,640
Incurred related to: Prior years (6,050) 1,426
Total incurred losses and LAE 5,571,861 4,574,066
Paid related to: Current year 1,375,665 1,015,538
Paid related to: Prior years 1,786,393 2,042,712
Total paid losses and LAE 3,162,058 3,058,250
Foreign exchange/translation adjustment (41,000) (28,024)
Net reserves end of period 16,924,109 13,458,393
Plus reinsurance recoverables on unpaid losses 2,032,844 1,774,732
Gross reserves end of period $ 18,956,953 $ 15,233,125