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Acquisitions (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]      
Goodwill $ 21,065 $ 16,803 $ 18,355
Series of Individually Immaterial Business Acquisitions [Member]      
Business Acquisition [Line Items]      
Current Assets 5,939    
Property, Plant and Equipment, net 4,359    
Identified Intangible Assets 3,731    
Goodwill 3,787    
Other Assets 7    
Total Assets Acquired 17,823    
Current Liabilities 4,764    
Other Liabilities 53    
Total Liabilities Assumed 4,817    
Net Assets Acquired $ 13,006