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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Gross reserve for loss and loss expense, at beginning of year $ 4,067,163 $ 3,893,868 $ 3,771,240
Less: reinsurance recoverable on unpaid loss and loss expense, at beginning of year 544,162 537,388 585,855
Net reserves for loss and loss expense, at beginning of year 3,523,001 3,356,480 3,185,385
Incurred loss and loss expense for claims occurring in the current year 1,708,755 1,601,780 1,527,997
Prior Year Claims and Claims Adjustment Expense (72,932) (50,289) (29,863)
Total incurred loss and loss expense 1,635,823 1,551,491 1,498,134
Paid loss and loss expense for claims occurring in current year 642,586 579,527 573,718
Paid loss and loss expense for claims occurring in prior years 807,248 805,443 753,321
Total paid loss and loss expense 1,449,834 1,384,970 1,327,039
Net reserves for loss and loss expense, at end of year 3,706,086 3,523,001 3,356,480
Add: reinsurance recoverable on unpaid loss and loss expense, at end of year 554,269 544,162 537,388
Gross reserve for loss and loss expense, at end of year 4,260,355 4,067,163 3,893,868
Increase of net loss and loss expense reserves 183,100 166,500 171,100
Anticipated recoveries for salvage and subrogation claims 80,900 76,700 $ 67,700
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 $ 3,520,097    
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 [1]   $ 547,066  
[1] Includes an adjustment of $2.9 million related to our adoption of ASU 2016-13. Refer to Note 3. "Adoption of Accounting Pronouncements" for additionalinformation.