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Acquisitions - EnShape GmbH Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Oct. 27, 2016
Business Acquisition [Line Items]        
Goodwill $ 113,208 $ 113,208 $ 95,280  
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
Completed Technologies [Member] | EnShape GmbH [Member]        
Business Acquisition [Line Items]        
Finite-lived intangible assets       $ 1,089