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Reserve for Loss and Loss Expense - Schedule of Rollforward of Reserve for Loss and Loss Expense (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Gross reserve for loss and loss expense, at beginning of period $ 5,336,911 $ 5,144,821
Less: reinsurance recoverable on unpaid loss and loss expense, at beginning of period 618,601 757,513
Net reserve for loss and loss expense, at beginning of period 4,718,310 4,387,308
Incurred loss and loss expense for claims occurring in the:    
Current year 2,212,750 1,865,247
Prior years 182,748 (5,782)
Total incurred loss and loss expense 2,395,498 1,859,465
Paid loss and loss expense for claims occurring in the:    
Current year 638,494 607,595
Prior years 1,053,299 988,859
Total paid loss and loss expense 1,691,793 1,596,454
Net reserve for loss and loss expense, at end of period 5,422,015 4,650,319
Add: Reinsurance recoverable on unpaid loss and loss expense, at end of period 1,029,981 651,051
Gross reserve for loss and loss expense, at end of period $ 6,451,996 $ 5,301,370