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Business Acquisitions (Details textual) - USD ($)
$ in Thousands
3 Months Ended
Nov. 30, 2016
Mar. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]      
Goodwill   $ 896,436 $ 801,406
Goodwill, Acquired During Period   $ 91,945  
Prox Dynamics, AS [Member]      
Business Acquisition [Line Items]      
Cash acquired $ 11,706    
Goodwill 91,900    
Total purchase price 134,088    
Identifiable intangible assets $ 31,400