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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Gross reserve for loss and loss expense, at beginning of year $ 3,691,719 $ 3,517,728 $ 3,477,870
Less: reinsurance recoverable on unpaid loss and loss expense, at beginning of year 611,200 551,019 571,978
Net reserve for loss and loss expense, at beginning of year 3,080,519 2,966,709 2,905,892
Incurred loss and loss expense for claims occurring in the current year 1,384,266 1,300,565 1,217,550
Incurred loss and loss expense for claims occurring in the prior years (39,192) (65,768) (69,009)
Total incurred loss and loss expense 1,345,074 1,234,797 1,148,541
Paid loss and loss expense for claims occurring in current year 497,486 450,811 446,550
Paid loss and loss expense for claims occurring in prior years 742,722 670,176 641,174
Total paid loss and loss expense 1,240,208 1,120,987 1,087,724
Net reserve for loss and loss expense, at end of year 3,185,385 3,080,519 2,966,709
Add: reinsurance recoverable on unpaid loss and loss expense, at end of year 585,855 611,200 551,019
Gross reserve for loss and loss expense, at end of year 3,771,240 3,691,719 3,517,728
Increase of net loss and loss expense reserves 104,900 113,800 60,800
Anticipated recoveries for salvage and subrogation claims $ 64,800 $ 64,900 $ 62,100