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Loss And Loss Adjustment Expense Reserves - Activity In The Reserves For Losses And Loss Adjustment Expenses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Gross reserves, beginning of period $ 2,785,702 $ 2,584,910 $ 2,226,430
Reinsurance recoverables on unpaid losses, beginning of period (32,148) (25,323) (41,379)
Net reserves, beginning of period 2,753,554 2,559,587 2,185,051
Incurred losses and loss adjustment expenses related to:      
Current year 3,659,724 3,553,801 3,314,938
Prior years 24,787 (35,948) 47,281
Total incurred losses and loss adjustment expenses 3,684,511 3,517,853 3,362,219
Loss and loss adjustment expense payments related to:      
Current year 1,963,076 2,080,690 1,862,006
Prior years 1,351,603 1,243,196 1,125,677
Total payments 3,314,679 3,323,886 2,987,683
Net reserves, end of period 3,123,386 2,753,554 2,559,587
Reinsurance recoverables on unpaid losses, end of period 28,645 32,148 25,323
Gross reserves, end of period $ 3,152,031 $ 2,785,702 $ 2,584,910