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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Reserve For Losses LAE And Future Policy Benefit Reserve [Abstract]      
Gross reserves beginning of period $ 13,119,090 $ 11,884,321 $ 10,312,313
Less reinsurance recoverables (1,619,641) (1,212,649) (990,862)
Net reserves beginning of period 11,499,449 10,671,672 9,321,451
Incurred related to: Current year 4,986,456 5,264,327 4,815,967
Incurred related to: Prior years (63,558) 387,076 (293,386)
Total incurred losses and LAE 4,922,898 5,651,403 4,522,581
Paid related to: Current year 2,042,246 1,700,765 1,280,605
Paid related to: Prior years 2,460,825 3,011,175 2,062,634
Total paid losses and LAE 4,503,071 4,711,940 3,343,239
Foreign exchange/translation adjustment 51,325 (111,686) 170,879
Net reserves end of period 11,970,601 11,499,449 10,671,672
Plus reinsurance recoverables 1,640,712 1,619,641 1,212,649
Gross reserves end of period $ 13,611,313 $ 13,119,090 $ 11,884,321