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Business Combinations (Schedule of Assets Acquired and Liabilities Assumed) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]        
Goodwill $ 84,761 $ 74,825 $ 75,509 $ 75,691
R.P.M.        
Business Acquisition [Line Items]        
Cash 2,547      
Accounts receivable 7,111      
Inventory 15,471      
Prepaid expenses 134      
Property, plant & equipment 5,902      
Intangible assets 5,875      
Other assets 1,053      
Other liabilities assumed (4,735)      
Net assets assumed 33,358      
Goodwill 7,741      
Acquisition Price $ 41,099