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Loss And Loss Adjustment Expense Reserves (Activity In The Reserves For Losses And Loss Adjustment Expenses) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Gross reserves, beginning of period $ 2,785,702 $ 2,584,910
Reinsurance recoverables on unpaid losses 32,148 25,322
Net reserves, beginning of period 2,753,554 2,559,588
Incurred losses and loss adjustment expenses related to:    
Current year 2,742,654 2,683,219
Prior years 16,463 (32,138)
Total incurred losses and loss adjustment expenses 2,759,117 2,651,081
Loss and loss adjustment expense payments related to:    
Current year 1,342,081 1,461,077
Prior years 1,127,033 1,052,386
Total payments 2,469,114 2,513,463
Net reserves, end of period 3,043,557 2,697,206
Reinsurance recoverables on unpaid losses, end of period 30,133 26,570
Gross reserves, end of period $ 3,073,690 $ 2,723,776