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Business Combinations (Schedule of Assets Acquired and Liabilities Assumed) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
acquisition
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]    
Number of businesses acquired | acquisition 3  
Goodwill $ 85,033 $ 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 5,875  
Other assets 1,053  
Other liabilities assumed (4,735)  
Net assets assumed 33,358  
Goodwill 7,741  
Acquisition Price $ 41,099