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Reserve for Loss and Loss Expense (Rollforward of Reserve for Loss and Loss Expense) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 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 1,221,635 1,041,778
Prior year development (8,067) (22,674)
Total incurred loss and loss expense 1,213,568 1,019,104
Paid loss and loss expense for claims occurring in the current year 320,026 272,401
Paid loss and loss expense for claims occurring in the prior years 720,314 570,868
Total paid loss and loss expense 1,040,340 843,269
Net reserve for loss and loss expense, at end of period 4,560,536 4,178,097
Add: reinsurance recoverable on unpaid loss and loss expense, at end of period 616,487 544,082
Gross reserve for loss and loss expense, at end of period $ 5,177,023 $ 4,722,179