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Reserve for Loss and Loss Expense (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, 2017
Dec. 31, 2016
Dec. 31, 2015
Liability for Claims and Claims Adjustment Expense [Line Items]      
Salvage and Subrogation Recoveries, Value $ 64,800 $ 64,900 $ 62,100
Reserve for loss and loss expense at beginning of year, gross 29,962 30,411 30,653
Incurred loss and loss expense, gross 126 1,483 2,968
Less: loss and loss expense paid, gross (1,673) (1,932) (3,210)
Reserve for loss and loss expense at the end of year, gross 28,415 29,962 30,411
Reserve for loss and loss expense at beginning of year, net 22,716 23,161 22,994
Incurred loss and loss expense, net 0 1,380 3,320
Less: loss and loss expense paid, net (1,504) (1,825) (3,153)
Reserve for loss and loss expense at the end of year, net 21,212 22,716 23,161
Asbestos [Member]      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Reserve for loss and loss expense at beginning of year, gross 7,847 8,024 8,751
Incurred loss and loss expense, gross 0 77 428
Less: loss and loss expense paid, gross (270) (254) (299)
Reserve for loss and loss expense at the end of year, gross 7,577 7,847 8,024
Reserve for loss and loss expense at beginning of year, net 6,615 6,793 7,314
Incurred loss and loss expense, net 0 77 (77)
Less: loss and loss expense paid, net (269) (255) (444)
Reserve for loss and loss expense at the end of year, net 6,346 6,615 6,793
Enviromental [Member]      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Reserve for loss and loss expense at beginning of year, gross 22,115 22,387 21,902
Incurred loss and loss expense, gross 126 1,406 3,396
Less: loss and loss expense paid, gross (1,403) (1,678) (2,911)
Reserve for loss and loss expense at the end of year, gross 20,838 22,115 22,387
Reserve for loss and loss expense at beginning of year, net 16,101 16,368 15,680
Incurred loss and loss expense, net 0 1,303 3,397
Less: loss and loss expense paid, net (1,235) (1,570) (2,709)
Reserve for loss and loss expense at the end of year, net $ 14,866 $ 16,101 $ 16,368