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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Gross reserve for loss and loss expense, at beginning of year $ 4,580,903 $ 4,260,355 $ 4,067,163  
Less: reinsurance recoverable on unpaid loss and loss expense, at beginning of year 578,641 554,269    
Net reserves for loss and loss expense, at beginning of year 4,002,262 3,706,086 3,520,097  
Incurred loss and loss expense for claims occurring in the current year 2,190,668 1,896,837 1,708,755  
Prior Year Claims and Claims Adjustment Expense (78,890) (82,853) (72,932)  
Total incurred loss and loss expense 2,111,778 1,813,984 1,635,823  
Paid loss and loss expense for claims occurring in current year 768,583 676,331 642,586  
Paid loss and loss expense for claims occurring in prior years 958,149 841,477 807,248  
Total paid loss and loss expense 1,726,732 1,517,808 1,449,834  
Net reserves for loss and loss expense, at end of year 4,387,308 4,002,262 3,706,086  
Add: reinsurance recoverable on unpaid loss and loss expense, at end of year 757,513 578,641 554,269  
Gross reserve for loss and loss expense, at end of year 5,144,821 4,580,903 4,260,355  
Increase of net loss and loss expense reserves 385,000 296,200 183,100  
Anticipated recoveries for salvage and subrogation claims $ 91,300 87,000 80,900  
Accounting Standards Update 2016-13 [Member]        
Less: reinsurance recoverable on unpaid loss and loss expense, at beginning of year [1]     547,066  
Net reserves for loss and loss expense, at beginning of year   3,706,086    
Net reserves for loss and loss expense, at end of year     3,706,086  
Equity Impact on Cumulative Effect Adjustment   $ 0 0 $ (1,845)
Accounting Standards Update 2016-13 [Member] | Retained Earnings [Member]        
Equity Impact on Cumulative Effect Adjustment     $ 2,900  
[1] 12020 includes an adjustment of $2.9 million related to our adoption of ASU 2016-13, Financial Instruments - Credit Losses.