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Reserve for Losses and Loss Expenses (Roll Forward of Gross and Net Asbestos and Net Environmental Incurred Losses and Loss Expenses and Related Reserves) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Liability for Claims and Claims Adjustment Expense [Line Items]      
Salvage and Subrogation Recoveries, Value $ 64,900 $ 62,100 $ 65,100
Reserves for losses and loss expenses at beginning of year, gross 30,411 30,653 32,764
Incurred losses and loss expenses, gross 1,483 2,968 167
Less: losses and loss expenses paid, gross (1,932) (3,210) (2,278)
Reserves for losses and loss expenses at the end of year, gross 29,962 30,411 30,653
Reserves for losses and loss expenses at beginning of year, net 23,161 22,994 25,167
Incurred losses and loss expenses, net 1,380 3,320 0
Less: losses and loss expenses paid, net (1,825) (3,153) (2,173)
Reserves for losses and loss expenses at the end of year, net 22,716 23,161 22,994
Asbestos [Member]      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Reserves for losses and loss expenses at beginning of year, gross 8,024 8,751 8,897
Incurred losses and loss expenses, gross 77 (428) 60
Less: losses and loss expenses paid, gross (254) (299) (206)
Reserves for losses and loss expenses at the end of year, gross 7,847 8,024 8,751
Reserves for losses and loss expenses at beginning of year, net 6,793 7,314 7,518
Incurred losses and loss expenses, net 77 (77) 0
Less: losses and loss expenses paid, net (255) (444) (204)
Reserves for losses and loss expenses at the end of year, net 6,615 6,793 7,314
Enviromental [Member]      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Reserves for losses and loss expenses at beginning of year, gross 22,387 21,902 23,867
Incurred losses and loss expenses, gross 1,406 3,396 107
Less: losses and loss expenses paid, gross (1,678) (2,911) (2,072)
Reserves for losses and loss expenses at the end of year, gross 22,115 22,387 21,902
Reserves for losses and loss expenses at beginning of year, net 16,368 15,680 17,649
Incurred losses and loss expenses, net 1,303 3,397 0
Less: losses and loss expenses paid, net (1,570) (2,709) (1,969)
Reserves for losses and loss expenses at the end of year, net $ 16,101 $ 16,368 $ 15,680