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Reserve for Loss and Loss Expense (Rollforward of Reserve for Loss and Loss Expense) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Liability for Claims and Claims Adjustment Expense [Line Items]    
Gross reserve for loss and loss expense, at beginning of period $ 5,144,821 $ 4,580,903
Less: reinsurance recoverable on unpaid loss and loss expense, at beginning of period 757,513 578,641
Net reserve for loss and loss expense, at beginning of period 4,387,308 4,002,262
Incurred loss and loss expense for claims occurring in the current year 1,865,247 1,610,940
Incurred loss and loss expense for claims occurring in the prior year (5,782) (44,010)
Total incurred loss and loss expense 1,859,465 1,566,930
Paid loss and loss expense for claims occurring in the current year 607,595 513,118
Paid loss and loss expense for claims occurring in the prior years 988,859 779,438
Total paid loss and loss expense 1,596,454 1,292,556
Net reserve for loss and loss expense, at end of period 4,650,319 4,276,636
Add: reinsurance recoverable on unpaid loss and loss expense, at end of period 651,051 688,641
Gross reserve for loss and loss expense, at end of period $ 5,301,370 $ 4,965,277