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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, 2015
Dec. 31, 2014
Dec. 31, 2013
Liability for Claims and Claims Adjustment Expense [Line Items]      
Salvage and Subrogation Recoveries, Value $ 62,100 $ 65,100 $ 61,000
Reserves for losses and loss expenses at beginning of year, gross 30,653 32,764 35,575
Incurred losses and loss expenses, gross (2,968) (167) (347)
Less: losses and loss expenses paid, gross (3,210) (2,278) (3,158)
Reserves for losses and loss expenses at the end of year, gross 30,411 30,653 32,764
Reserves for losses and loss expenses at beginning of year, net 22,994 25,167 27,769
Incurred losses and loss expenses, net (3,320) 0 (68)
Less: losses and loss expenses paid, net (3,153) (2,173) (2,670)
Reserves for losses and loss expenses at the end of year, net 23,161 22,994 25,167
Asbestos [Member]      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Reserves for losses and loss expenses at beginning of year, gross 8,751 8,897 9,170
Incurred losses and loss expenses, gross (428) (60) 0
Less: losses and loss expenses paid, gross (299) (206) (273)
Reserves for losses and loss expenses at the end of year, gross 8,024 8,751 8,897
Reserves for losses and loss expenses at beginning of year, net 7,314 7,518 7,791
Incurred losses and loss expenses, net (77) 0 0
Less: losses and loss expenses paid, net (444) (204) (273)
Reserves for losses and loss expenses at the end of year, net 6,793 7,314 7,518
Enviromental [Member]      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Reserves for losses and loss expenses at beginning of year, gross 21,902 23,867 26,405
Incurred losses and loss expenses, gross (3,396) (107) (347)
Less: losses and loss expenses paid, gross (2,911) (2,072) (2,885)
Reserves for losses and loss expenses at the end of year, gross 22,387 21,902 23,867
Reserves for losses and loss expenses at beginning of year, net 15,680 17,649 19,978
Incurred losses and loss expenses, net (3,397) 0 (68)
Less: losses and loss expenses paid, net (2,709) (1,969) (2,397)
Reserves for losses and loss expenses at the end of year, net $ 16,368 $ 15,680 $ 17,649