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Acquisitions - fair values determination of assets acquired and liabilities assumed in acquisition (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]      
Goodwill $ 1,276,720 $ 1,295,852 $ 1,323,553
Business Combinations 2016      
Business Acquisition [Line Items]      
Current assets 2,544    
Property, plant and equipment 662    
Goodwill 3,689    
Total assets acquired 13,968    
Current liabilities 589    
Liabilities assumed 589    
Net assets acquired 13,379    
Business Combinations 2016 | Customer relationships      
Business Acquisition [Line Items]      
Intangible Assets 6,465    
Business Combinations 2016 | Noncompete agreements      
Business Acquisition [Line Items]      
Intangible Assets $ 608