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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, 2015
Dec. 31, 2014
Dec. 31, 2013
Gross reserves for losses and loss expenses, at beginning of year $ 3,477,870 $ 3,349,770 $ 4,068,941
Less: reinsurance recoverable on unpaid losses and loss expenses, at beginning of year 571,978 540,839 1,409,755
Net reserves for losses and loss expenses, at beginning of year 2,905,892 2,808,931 2,659,186
Incurred losses and loss expense for claims occurring in the current year 1,217,550 1,216,770 1,147,263
Incurred losses and loss expenses for claims occurring in the prior years (69,009) (59,269) (25,525)
Total incurred losses and loss expenses 1,148,541 1,157,501 1,121,738
Paid losses and loss expenses for claims occurring in current year 446,550 468,478 399,559
Paid losses and loss expenses for claims occurring in prior years 641,174 592,062 572,434
Total paid losses and loss expenses 1,087,724 1,060,540 971,993
Net reserves for losses and loss expenses, at end of year 2,966,709 2,905,892 2,808,931
Add: reinsurance recoverable on unpaid losses and loss expenses, at end of year 551,019 571,978 540,839
Gross reserves for losses and loss expenses, at end of year 3,517,728 3,477,870 3,349,770
Increase of net loss and loss expense reserves 60,800 97,000 149,700
Anticipated recoveries for salvage and subrogation claims $ 62,100 $ 65,100 $ 61,000