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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2020
Gross reserve for loss and loss expense, at beginning of year $ 4,260,355 $ 4,067,163 $ 3,893,868  
Less: reinsurance recoverable on unpaid loss and loss expense, at beginning of year 554,269 [1] 544,162 537,388  
Net reserves for loss and loss expense, at beginning of year 3,706,086 3,523,001 3,356,480  
Incurred loss and loss expense for claims occurring in the current year 1,896,837 1,708,755 1,601,780  
Prior Year Claims and Claims Adjustment Expense (82,853) (72,932)    
Total incurred loss and loss expense 1,813,984 1,635,823 1,551,491  
Paid loss and loss expense for claims occurring in current year 676,331 642,586 579,527  
Paid loss and loss expense for claims occurring in prior years 841,477 807,248 805,443  
Total paid loss and loss expense 1,517,808 1,449,834 1,384,970  
Net reserves for loss and loss expense, at end of year 4,002,262 3,706,086 3,523,001  
Add: reinsurance recoverable on unpaid loss and loss expense, at end of year 578,641 554,269 [1] 544,162  
Gross reserve for loss and loss expense, at end of year 4,580,903 4,260,355 4,067,163  
Increase of net loss and loss expense reserves 296,200 183,100 166,500  
Anticipated recoveries for salvage and subrogation claims 87,000 80,900 76,700  
Accounting Standards Update 2016-13 [Member]        
Less: reinsurance recoverable on unpaid loss and loss expense, at beginning of year   547,066    
Net reserves for loss and loss expense, at beginning of year   $ 3,520,097    
Net reserves for loss and loss expense, at end of year     3,520,097  
Add: reinsurance recoverable on unpaid loss and loss expense, at end of year     547,066  
Equity Impact on Cumulative Effect Adjustment       $ 0
Accounting Standards Update 2016-13 [Member] | Retained Earnings [Member]        
Prior Year Claims and Claims Adjustment Expense     $ 50,289  
Equity Impact on Cumulative Effect Adjustment $ 2,900      
[1] ncludes an adjustment of $2.9 million related to our adoption of ASU 2016-13, Financial Instruments - Credit Losses.