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Business Acquisitions - Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
May. 18, 2015
Dec. 31, 2014
Jun. 30, 2014
Business Acquisition [Line Items]        
Goodwill $ 117,859   $ 72,365 $ 58,554
Kay Flow Industries, Inc.        
Business Acquisition [Line Items]        
Cash   $ 880    
Accounts receivable   14,699    
Inventory   25,094    
Other assets   6,155    
Intangibles   53,091    
Goodwill   45,494    
Property, plant, and equipment   27,426    
Accounts payable   (17,075)    
Other current liabilities   (4,521)    
Long-term debt   0    
Other non-current liabilities   (26,035)    
Total purchase price   $ 125,208