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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, 2025
Sep. 30, 2024
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Gross reserves, beginning of period $ 3,152,031 $ 2,785,702
Reinsurance recoverables on unpaid losses 28,645 32,148
Net reserves, beginning of period 3,123,386 2,753,554
Incurred losses and loss adjustment expenses related to:    
Current year 3,117,788 2,742,654
Prior years (74,192) 16,463
Total incurred losses and loss adjustment expenses 3,043,596 2,759,117
Loss and loss adjustment expense payments related to:    
Current year 1,476,133 1,342,081
Prior years 1,183,627 1,127,033
Total payments 2,659,760 2,469,114
Net reserves, end of period 3,507,222 3,043,557
Reinsurance recoverables on unpaid losses, end of period 88,750 30,133
Gross reserves, end of period $ 3,595,972 $ 3,073,690