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Acquisitions (Details 2) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]        
Identified Intangible Assets $ 159,445      
Goodwill 179,048 $ 21,065 $ 16,803 $ 18,355
Florock and Dofesa        
Business Acquisition [Line Items]        
Current Assets 5,949 5,939    
Property, Plant and Equipment, net 4,112 4,359    
Identified Intangible Assets 6,055 3,731    
Goodwill 1,739 3,787    
Other Assets 7 7    
Total Assets Acquired 17,862      
Current Liabilities 4,764 4,764    
Other Liabilities 53 53    
Total Identifiable Liabilities Assumed 4,817 4,817    
Total Estimated Purchase Price, net of Cash Acquired $ 13,045 $ 13,006