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Business Combinations (Schedule of Assets Acquired and Liabilities Assumed) (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
acquisition
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]    
Number of businesses acquired | acquisition 3  
Goodwill $ 83,972 $ 84,761
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 5,855  
Other assets 1,057  
Other liabilities assumed (5,635)  
Net assets assumed 32,442  
Goodwill 8,657  
Acquisition Price $ 41,099