v3.26.1
Loss And Loss Adjustment Expense Reserves (Activity In The Reserves For Losses And Loss Adjustment Expenses) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Gross reserves, beginning of period $ 3,633,338 $ 3,152,031
Reinsurance recoverables on unpaid losses, beginning of period (34,008) (28,645)
Net reserves, beginning of period 3,599,330 3,123,386
Incurred losses and loss adjustment expenses related to:    
Current year 1,950,345 2,207,746
Prior years (44,114) (46,896)
Total incurred losses and loss adjustment expenses 1,906,231 2,160,850
Loss and loss adjustment expense payments related to:    
Current year 786,923 938,379
Prior years 1,077,656 896,037
Total payments 1,864,579 1,834,416
Net reserves, end of period 3,640,982 3,449,820
Reinsurance recoverables on unpaid losses, end of period 33,718 162,340
Gross reserves, end of period $ 3,674,700 $ 3,612,160