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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Liability for Claims and Claims Adjustment Expense [Line Items]      
Reserve for loss and loss expense at beginning of year, gross $ 27,773 $ 28,530 $ 28,701
Incurred loss and loss expense, gross (704) (562) (127)
Less: loss and loss expense paid, Gross (709) (195) (44)
Reserve for loss and loss expense at the end of year, gross 27,768 27,773 28,530
Reserve for loss and loss expense at beginning of year, net 21,075 21,421 21,589
Incurred loss and loss expense, Net (205) 37 (154)
Less: loss and loss expense paid, Net (541) (383) (14)
Reserve for loss and loss expense at the end of year, net 20,329 21,075 21,421
Asbestos [Member]      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Reserve for loss and loss expense at beginning of year, gross 6,115 6,254 6,288
Incurred loss and loss expense, gross (8) (51) (320)
Less: loss and loss expense paid, Gross (232) (190) (354)
Reserve for loss and loss expense at the end of year, gross 5,891 6,115 6,254
Reserve for loss and loss expense at beginning of year, net 4,884 5,023 5,057
Incurred loss and loss expense, Net 8 51 320
Less: loss and loss expense paid, Net (232) (190) (354)
Reserve for loss and loss expense at the end of year, net 4,660 4,884 5,023
Enviromental [Member]      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Reserve for loss and loss expense at beginning of year, gross 21,658 22,276 22,413
Incurred loss and loss expense, gross (696) (613) (447)
Less: loss and loss expense paid, Gross (477) (5) (310)
Reserve for loss and loss expense at the end of year, gross 21,877 21,658 22,276
Reserve for loss and loss expense at beginning of year, net 16,191 16,398 16,532
Incurred loss and loss expense, Net 213 14 474
Less: loss and loss expense paid, Net (309) (193) (340)
Reserve for loss and loss expense at the end of year, net $ 15,669 $ 16,191 $ 16,398