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Acquisitions (Details 4) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]      
Intangible Assets Subject to Amortization: $ 159,445    
Goodwill $ 186,044 $ 21,065 $ 16,803
Series of Individually Immaterial Business Acquisitions [Member]      
Business Acquisition [Line Items]      
Current Assets   5,949  
Property, Plant and Equipment   4,112  
Intangible Assets Subject to Amortization:   6,055  
Goodwill   1,739  
Other Assets   7  
Total Identifiable Assets Acquired   17,862  
Current Liabilities   4,764  
Other Liabilities   53  
Total Identifiable Liabilities Assumed   4,817  
Net Assets Acquired   $ 13,045