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Loss And Loss Adjustment Expense Reserves (Activity In The Reserves For Losses And Loss Adjustment Expenses) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 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 1,271,847 909,810
Prior years (51,034) (5,845)
Total incurred losses and loss adjustment expenses 1,220,813 903,965
Loss and loss adjustment expense payments related to:    
Current year 406,513 301,198
Prior years 529,188 527,348
Total payments 935,701 828,546
Net reserves, end of period 3,408,498 2,828,973
Reinsurance recoverables on unpaid losses, end of period 384,083 30,247
Gross reserves, end of period $ 3,792,581 $ 2,859,220