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Acquisitions - ViDi Systems S.A. Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Apr. 04, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]        
Goodwill $ 113,208   $ 95,280 $ 81,448
ViDi Systems S.A. [Member]        
Business Acquisition [Line Items]        
Cash   $ 146    
Accounts receivable   425    
Prepaid expenses and other current assets   129    
Property, plant, and equipment   40    
Deferred income tax asset   620    
Accounts payable   (98)    
Accrued expenses   (716)    
Deferred income tax liability   (1,008)    
Goodwill   18,333    
Purchase price   23,015    
Non-compete agreements | ViDi Systems S.A. [Member]        
Business Acquisition [Line Items]        
Finite-lived intangible assets   370    
Technology-Based Intangible Assets [Member] | ViDi Systems S.A. [Member]        
Business Acquisition [Line Items]        
Finite-lived intangible assets   $ 4,774