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Acquisitions (Allocation of Purchase Consideration to the Assets Acquired and Liabilities Assumed) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Jun. 09, 2015
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Business Acquisition [Line Items]          
Goodwill $ 292,390   $ 236,044 $ 341,174  
Rough Brothers Incorporated          
Business Acquisition [Line Items]          
Cash   $ 4,651      
Working capital   21,436      
Property, plant, and equipment   12,797      
Acquired intangible assets   56,392      
Other assets   3,049      
Deferred income taxes   (4,892)      
Other liabilities   (3,028)      
Goodwill   57,180      
Fair value of purchase consideration   $ 147,585      
2013 Acquisitions          
Business Acquisition [Line Items]          
Working capital     2,665    
Property, plant, and equipment     153    
Acquired intangible assets     2,170    
Goodwill     2,466    
Fair value of purchase consideration     $ 7,454   $ 7,454