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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Liability for Claims and Claims Adjustment Expense [Line Items]      
Reserve for loss and loss expense at beginning of year, gross $ 30,020 $ 28,415 $ 29,962
Incurred loss and loss expense, gross (348) (3,059) (126)
Less: loss and loss expense paid, gross (1,667) (1,454) (1,673)
Reserve for loss and loss expense at the end of year, gross 28,701 30,020 28,415
Reserve for loss and loss expense at beginning of year, net 22,783 21,212 22,716
Incurred loss and loss expense, net 234 2,877 0
Less: loss and loss expense paid, net (1,428) (1,306) (1,504)
Reserve for loss and loss expense at the end of year, net 21,589 22,783 21,212
Asbestos [Member]      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Reserve for loss and loss expense at beginning of year, gross 7,328 7,577 7,847
Incurred loss and loss expense, gross (375) 0 0
Less: loss and loss expense paid, gross (665) (249) (270)
Reserve for loss and loss expense at the end of year, gross 6,288 7,328 7,577
Reserve for loss and loss expense at beginning of year, net 6,097 6,346 6,615
Incurred loss and loss expense, net (375) 0 0
Less: loss and loss expense paid, net (665) (249) (269)
Reserve for loss and loss expense at the end of year, net 5,057 6,097 6,346
Enviromental [Member]      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Reserve for loss and loss expense at beginning of year, gross 22,692 20,838 22,115
Incurred loss and loss expense, gross (723) (3,059) (126)
Less: loss and loss expense paid, gross (1,002) (1,205) (1,403)
Reserve for loss and loss expense at the end of year, gross 22,413 22,692 20,838
Reserve for loss and loss expense at beginning of year, net 16,686 14,866 16,101
Incurred loss and loss expense, net 609 2,877 0
Less: loss and loss expense paid, net (763) (1,057) (1,235)
Reserve for loss and loss expense at the end of year, net $ 16,532 $ 16,686 $ 14,866