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Acquisitions (Schedule of Allocation of the Purchase Price Consideration of the Fair Value of Assets Acquired and Liabilities Assumed) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Oct. 11, 2016
Dec. 31, 2015
Jun. 09, 2015
Dec. 31, 2014
Business Acquisition [Line Items]          
Goodwill $ 304,032   $ 292,390   $ 236,044
Nexus          
Business Acquisition [Line Items]          
Cash   $ 2,495      
Working capital   (1,109)      
Property, plant, and equipment   4,702      
Acquired intangible assets   6,200      
Other assets   23      
Goodwill   12,283      
Fair value of purchase consideration   $ 24,594      
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