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Unpaid Losses And Loss Adjustment Expenses (Reconciliation Of Consolidated Reserves For Losses And Loss Adjustment Expenses) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]        
Net reserves for losses and loss adjustment expenses, beginning of year     $ 9,475,261 $ 9,214,443
Effect of foreign currency rate changes on beginning of year balance $ (75,037) $ (2,866) (75,037) (2,866)
Effect of adoption of ASC 326 (see note 2) 3,849 0 3,849 0
Adjusted net reserves for losses and loss adjustment expenses, beginning of year     9,404,073 9,211,577
Incurred losses and loss adjustment expenses, current accident years 877,364 796,712 2,057,729 1,554,682
Incurred losses and loss adjustment expenses, prior accident years     (268,220) (188,949)
Total incurred losses and loss adjustment expenses     1,789,509 1,365,733
Payments, current accident year     217,466 206,461
Payments, prior accident years     1,033,176 1,173,743
Total payments     1,250,642 1,380,204
Effect of foreign currency rate changes on current year activity     (1,997) 760
Net reserves for losses and loss adjustment expenses, end of period 9,940,943 9,197,866 9,940,943 9,197,866
Reinsurance recoverable on unpaid losses 5,304,562 5,137,917 5,304,562 5,137,917
Gross reserves for losses and loss adjustment expenses, end of period $ 15,245,505 $ 14,335,783 $ 15,245,505 $ 14,335,783