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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Liability for Claims and Claims Adjustment Expense [Line Items]      
Reserve for loss and loss expense at beginning of year, gross $ 28,530 $ 28,701 $ 30,020
Incurred loss and loss expense, Gross (562) (127) 348
Less: loss and loss expense paid, Gross (195) (44) (1,667)
Reserve for loss and loss expense at the end of year, gross 27,773 28,530 28,701
Reserve for loss and loss expense at beginning of year, net 21,421 21,589 22,783
Incurred loss and loss expense, Net 37 (154) 234
Less: loss and loss expense paid, Net (383) (14) (1,428)
Reserve for loss and loss expense at the end of year, net 21,075 21,421 21,589
Asbestos [Member]      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Reserve for loss and loss expense at beginning of year, gross 6,254 6,288 7,328
Incurred loss and loss expense, Gross 51 320 (375)
Less: loss and loss expense paid, Gross (190) (354) (665)
Reserve for loss and loss expense at the end of year, gross 6,115 6,254 6,288
Reserve for loss and loss expense at beginning of year, net 5,023 5,057 6,097
Incurred loss and loss expense, Net 51 320 (375)
Less: loss and loss expense paid, Net (190) (354) (665)
Reserve for loss and loss expense at the end of year, net 4,884 5,023 5,057
Enviromental [Member]      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Reserve for loss and loss expense at beginning of year, gross 22,276 22,413 22,692
Incurred loss and loss expense, Gross (613) (447) 723
Less: loss and loss expense paid, Gross (5) 310 (1,002)
Reserve for loss and loss expense at the end of year, gross 21,658 22,276 22,413
Reserve for loss and loss expense at beginning of year, net 16,398 16,532 16,686
Incurred loss and loss expense, Net (14) (474) 609
Less: loss and loss expense paid, Net (193) 340 (763)
Reserve for loss and loss expense at the end of year, net $ 16,191 $ 16,398 $ 16,532