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Acquisitions - EnShape GmbH Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Oct. 27, 2016
Dec. 31, 2015
Business Acquisition [Line Items]        
Goodwill $ 113,208 $ 95,280   $ 81,448
EnShape GmbH [Member]        
Business Acquisition [Line Items]        
Cash     $ 167  
Accounts receivable     4  
Inventories     79  
Prepaid expenses and other current assets     1,896  
Property, plant, and equipment     44  
Goodwill     6,732  
Accounts payable     (6)  
Accrued expenses     (209)  
Accrued income taxes     (2,342)  
Purchase price     7,901  
Customer Relationships [Member] | EnShape GmbH [Member]        
Business Acquisition [Line Items]        
Finite-lived intangible assets     447  
Technology-Based Intangible Assets [Member] | EnShape GmbH [Member]        
Business Acquisition [Line Items]        
Finite-lived intangible assets     $ 1,089