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Acquisitions - Webscan, Inc Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 09, 2016
Dec. 31, 2015
Business Acquisition [Line Items]        
Goodwill $ 113,208 $ 95,280   $ 81,448
Webscan, Inc. [Member]        
Business Acquisition [Line Items]        
Accounts receivable     $ 504  
Inventories     296  
Prepaid expenses and other current assets     8  
Goodwill     925  
Accounts payable     (77)  
Purchase price     3,176  
Customer Relationships [Member] | Webscan, Inc. [Member]        
Business Acquisition [Line Items]        
Finite-lived intangible assets     680  
Technology-Based Intangible Assets [Member] | Webscan, Inc. [Member]        
Business Acquisition [Line Items]        
Finite-lived intangible assets     $ 840