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Acquisitions - Purchase Price Allocation (Details)
€ in Thousands, $ in Thousands
1 Months Ended
Oct. 31, 2016
USD ($)
Oct. 31, 2016
EUR (€)
Oct. 02, 2016
USD ($)
Dec. 31, 2015
USD ($)
Business Acquisition [Line Items]        
Goodwill     $ 82,831 $ 81,448
Subsequent Event | AQSense, S.L.        
Business Acquisition [Line Items]        
Accounts receivable $ 168      
Goodwill 1,383      
Accrued expenses (14)      
Purchase price 2,519 € 2,232    
Customer Relationships | Subsequent Event | AQSense, S.L.        
Business Acquisition [Line Items]        
Intangible assets, other than Goodwill 598      
Completed Technology | Subsequent Event | AQSense, S.L.        
Business Acquisition [Line Items]        
Intangible assets, other than Goodwill $ 384