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Reserve for Loss and Loss Expense (Exposure to Environmental Claims) (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Liability for Claims and Claims Adjustment Expense [Line Items]        
Loss and Loss expense reserves, Gross $ 26,409 $ 27,768 $ 27,773 $ 28,530
Liability for Asbestos and Environmental Claims, Net 19,143 $ 20,329 $ 21,075 $ 21,421
Asbestos Claim [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Loss and Loss expense reserves, Gross 4,900      
Liability for Asbestos and Environmental Claims, Net 3,500      
Landfill Sites Related Claims [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Loss and Loss expense reserves, Gross 11,400      
Liability for Asbestos and Environmental Claims, Net 7,500      
Underground Storage Tanks Claims [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Loss and Loss expense reserves, Gross 10,100      
Liability for Asbestos and Environmental Claims, Net $ 8,100