XML 94 R81.htm IDEA: XBRL DOCUMENT v3.8.0.1
Reserve for Loss and Loss Expense (Exposure to Environmental Claims) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Liability for Claims and Claims Adjustment Expense [Line Items]        
Loss and Loss expense reserves, Gross $ 28,415 $ 29,962 $ 30,411 $ 30,653
Liability for Asbestos and Environmental Claims, Net 21,212 22,716 23,161 22,994
Asbestos Claim [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Loss and Loss expense reserves, Gross 7,600      
Asbestos [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Loss and Loss expense reserves, Gross 7,577 7,847 8,024 8,751
Liability for Asbestos and Environmental Claims, Net 6,346 $ 6,615 $ 6,793 $ 7,314
Landfill Sites Related Claims [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Loss and Loss expense reserves, Gross 12,400      
Liability for Asbestos and Environmental Claims, Net 7,700      
Leaking Underground Storage Tanks Claims [Member]        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Loss and Loss expense reserves, Gross 8,400      
Liability for Asbestos and Environmental Claims, Net $ 7,200