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Acquisitions Acquistions (Purchase Price Allocation) (Details) - USD ($)
$ in Thousands
May 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Business Acquisition [Line Items]      
Goodwill   $ 265,249 $ 264,416
Houston [Member]      
Business Acquisition [Line Items]      
Current assets   103  
Property, plant & equipment   5,711  
Goodwill   833  
Intangible and other non-current assets   3,629  
Assumed liabilities   $ (89)  
Purchase Price $ 10,187