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Acquisitions - Webscan, Inc Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 09, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]        
Goodwill $ 95,280   $ 81,448 $ 77,388
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