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Reserve for Loss and Loss Expense (Rollforward of Reserve for Loss and Loss Expense) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Gross reserve for loss and loss expense, at beginning of year $ 5,144,821 $ 4,580,903 $ 4,260,355
Less: reinsurance recoverable on unpaid loss and loss expense, at beginning of year 757,513 578,641 554,269
Net reserves for loss and loss expense, at beginning of year 4,387,308 4,002,262 3,706,086
Incurred loss and loss expense for claims occurring in the current year 2,474,331 2,190,668 1,896,837
Incurred loss and loss expense for claims occurring in the prior year (9,954) (78,890) (82,853)
Total incurred loss and loss expense 2,484,285 2,111,778 1,813,984
Paid loss and loss expense for claims occurring in current year 922,641 768,583 676,331
Paid loss and loss expense for claims occurring in prior years 1,230,642 958,149 841,477
Total paid loss and loss expense 2,153,283 1,726,732 1,517,808
Net reserves for loss and loss expense, at end of year 4,718,310 4,387,308 4,002,262
Add: reinsurance recoverable on unpaid loss and loss expense, at end of year 618,601 757,513 578,641
Gross reserve for loss and loss expense, at end of year $ 5,336,911 $ 5,144,821 $ 4,580,903