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Reserve for Loss and Loss Expense - Rollforward of Reserve for Loss and Loss Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 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 688,519 580,408
Prior years 15,773 (12,970)
Total incurred loss and loss expense 704,292 567,438
Paid loss and loss expense for claims occurring in the:    
Current year 107,719 91,011
Prior years 435,489 418,194
Total paid loss and loss expense 543,208 509,205
Net reserve for loss and loss expense, at end of period 4,879,394 4,445,541
Add: Reinsurance recoverable on unpaid loss and loss expense, at end of period 622,356 653,909
Gross reserve for loss and loss expense, at end of period $ 5,501,750 $ 5,099,450