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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Liability for Claims and Claims Adjustment Expense [Line Items]      
Reserve for loss and loss expense at beginning of year, gross $ 27,768 $ 27,773 $ 28,530
Incurred loss and loss expense, gross 1,064 704 562
Less: loss and loss expense paid, Gross (2,423) (709) (195)
Reserve for loss and loss expense at the end of year, gross 26,409 27,768 27,773
Reserve for loss and loss expense at beginning of year, net 20,329 21,075 21,421
Incurred loss and loss expense, Net 748 (205) 37
Less: loss and loss expense paid, Net (1,934) (541) (383)
Reserve for loss and loss expense at the end of year, net 19,143 20,329 21,075
Asbestos [Member]      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Reserve for loss and loss expense at beginning of year, gross 5,891 6,115 6,254
Incurred loss and loss expense, gross 603 8 51
Less: loss and loss expense paid, Gross (1,638) (232) (190)
Reserve for loss and loss expense at the end of year, gross 4,856 5,891 6,115
Reserve for loss and loss expense at beginning of year, net 4,660 4,884 5,023
Incurred loss and loss expense, Net 515 8 51
Less: loss and loss expense paid, Net (1,638) (232) (190)
Reserve for loss and loss expense at the end of year, net 3,537 4,660 4,884
Enviromental [Member]      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Reserve for loss and loss expense at beginning of year, gross 21,877 21,658 22,276
Incurred loss and loss expense, gross 461 696 613
Less: loss and loss expense paid, Gross (785) (477) (5)
Reserve for loss and loss expense at the end of year, gross 21,553 21,877 21,658
Reserve for loss and loss expense at beginning of year, net 15,669 16,191 16,398
Incurred loss and loss expense, Net 233 213 14
Less: loss and loss expense paid, Net (296) (309) (193)
Reserve for loss and loss expense at the end of year, net $ 15,606 $ 15,669 $ 16,191