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Acquisitions (Schedule of Assets Acquired and Liabilities Assumed) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Aug. 31, 2016
Dec. 31, 2015
Acquisition      
Goodwill $ 399,867   $ 397,470
Vulcan      
Acquisition      
Current assets, net of cash acquired   $ 36,958  
Property, plant & equipment   40,213  
Intangible assets   32,930  
Goodwill   7,189  
Total assets acquired   117,290  
Liabilities assumed   4,456  
Net assets acquired   $ 112,834