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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Liability for Claims and Claims Adjustment Expense [Line Items]      
Reserve for loss and loss expense at beginning of year, gross $ 28,701 $ 30,020 $ 28,415
Incurred loss and loss expense, Gross (127) 348 3,059
Less: loss and loss expense paid, Gross (44) (1,667) (1,454)
Reserve for loss and loss expense at the end of year, gross 28,530 28,701 30,020
Reserve for loss and loss expense at beginning of year, net 21,589 22,783 21,212
Incurred loss and loss expense, Net (154) 234 2,877
Less: loss and loss expense paid, Net (14) (1,428) (1,306)
Reserve for loss and loss expense at the end of year, net 21,421 21,589 22,783
Asbestos [Member]      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Reserve for loss and loss expense at beginning of year, gross 6,288 7,328 7,577
Incurred loss and loss expense, Gross 320 (375) 0
Less: loss and loss expense paid, Gross (354) (665) (249)
Reserve for loss and loss expense at the end of year, gross 6,254 6,288 7,328
Reserve for loss and loss expense at beginning of year, net 5,057 6,097 6,346
Incurred loss and loss expense, Net 320 (375) 0
Less: loss and loss expense paid, Net (354) (665) (249)
Reserve for loss and loss expense at the end of year, net 5,023 5,057 6,097
Enviromental [Member]      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Reserve for loss and loss expense at beginning of year, gross 22,413 22,692 20,838
Incurred loss and loss expense, Gross (447) 723 3,059
Less: loss and loss expense paid, Gross 310 (1,002) (1,205)
Reserve for loss and loss expense at the end of year, gross 22,276 22,413 22,692
Reserve for loss and loss expense at beginning of year, net 16,532 16,686 14,866
Incurred loss and loss expense, Net (474) 609 2,877
Less: loss and loss expense paid, Net 340 (763) (1,057)
Reserve for loss and loss expense at the end of year, net $ 16,398 $ 16,532 $ 16,686