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Reserve for Loss and Loss Expense - Schedule of Rollforward of Reserve for Loss and Loss Expense (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Gross reserve for loss and loss expense, at beginning of period $ 6,589,801 $ 5,336,911
Less: reinsurance recoverable on unpaid loss and loss expense, at beginning of period 1,022,245 618,601
Net reserve for loss and loss expense, at beginning of period 5,567,556 4,718,310
Incurred loss and loss expense for claims occurring in the:    
Current year 1,535,575 1,442,719
Prior years 34,648 187,121
Total incurred loss and loss expense 1,570,223 1,629,840
Paid loss and loss expense for claims occurring in the:    
Current year 320,366 347,501
Prior years 865,344 753,658
Total paid loss and loss expense 1,185,710 1,101,159
Net reserve for loss and loss expense, at end of period 5,952,069 5,246,991
Add: Reinsurance recoverable on unpaid loss and loss expense, at end of period 859,087 656,534
Gross reserve for loss and loss expense, at end of period $ 6,811,156 $ 5,903,525