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Reserve for Loss and Loss Expense - Schedule of Rollforward of Reserve for Loss and Loss Expense (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 reserve for loss and loss expense, at beginning of year $ 5,336,911 $ 5,144,821 $ 4,580,903
Less: reinsurance recoverable on unpaid loss and loss expense, at beginning of year 618,601 757,513 578,641
Net reserve for loss and loss expense, at beginning of year 4,718,310 4,387,308 4,002,262
Incurred loss and loss expense for claims occurring in the:      
Current year 2,879,213 2,474,331 2,190,668
Current year 285,271 9,954 (78,890)
Total incurred loss and loss expense 3,164,484 2,484,285 2,111,778
Paid loss and loss expense for claims occurring in the:      
Current year 1,001,792 922,641 768,583
Prior years 1,313,446 1,230,642 958,149
Total paid loss and loss expense 2,315,238 2,153,283 1,726,732
Net reserve for loss and loss expense, at end of year 5,567,556 4,718,310 4,387,308
Add: Reinsurance recoverable on unpaid loss and loss expense, at end of year 1,022,245 618,601 757,513
Gross reserve for loss and loss expense at end of year $ 6,589,801 $ 5,336,911 $ 5,144,821