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Reserve of Losses and Loss Expenses (Rollforward of Reserves for Losses and Loss Expenses) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Gross reserves for losses and loss expenses, at beginning of year $ 3,517,728 $ 3,477,870 $ 3,349,770
Less: reinsurance recoverable on unpaid losses and loss expenses, at beginning of year 551,019 571,978 540,839
Net reserves for losses and loss expenses, at beginning of year 2,966,709 2,905,892 2,808,931
Incurred losses and loss expense for claims occurring in the current year 1,300,565 1,217,550 1,216,770
Incurred losses and loss expenses for claims occurring in the prior years (65,768) (69,009) (59,269)
Total incurred losses and loss expenses 1,234,797 1,148,541 1,157,501
Paid losses and loss expenses for claims occurring in current year 450,811 446,550 468,478
Paid losses and loss expenses for claims occurring in prior years 670,176 641,174 592,062
Total paid losses and loss expenses 1,120,987 1,087,724 1,060,540
Net reserves for losses and loss expenses, at end of year 3,080,519 2,966,709 2,905,892
Add: reinsurance recoverable on unpaid losses and loss expenses, at end of year 611,200 551,019 571,978
Gross reserves for losses and loss expenses, at end of year 3,691,719 3,517,728 3,477,870
Increase of net loss and loss expense reserves 113,800 60,800 97,000
Anticipated recoveries for salvage and subrogation claims $ 64,900 $ 62,100 $ 65,100