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Acquisitions - AQSense, S.L. Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Aug. 30, 2016
Business Acquisition [Line Items]        
Goodwill $ 113,208 $ 113,208 $ 95,280  
AQSense, S.L. [Member]        
Business Acquisition [Line Items]        
Accounts receivable       $ 168
Goodwill       1,383
Accrued expenses       (14)
Purchase price       2,519
Customer Relationships [Member] | AQSense, S.L. [Member]        
Business Acquisition [Line Items]        
Finite-lived intangible assets       598
Completed Technologies [Member] | AQSense, S.L. [Member]        
Business Acquisition [Line Items]        
Finite-lived intangible assets       $ 384