Quarterly report pursuant to Section 13 or 15(d)

Acquisition - Intangible Assets Acquired (Details)

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Acquisition - Intangible Assets Acquired (Details) - Sovitec Mondial S.A. - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Mar. 31, 2018
Jun. 12, 2017
Business Acquisition      
Total intangible assets subject to amortization $ 3,659    
Total 5,753 $ 5,753 $ 0
Trade names      
Business Acquisition      
Trade names, not subject to amortization 2,094    
Trademarks      
Business Acquisition      
Total intangible assets subject to amortization $ 1,767    
Weighted-Average Expected Useful Life (in years) 11 years    
Technical know-how      
Business Acquisition      
Total intangible assets subject to amortization $ 1,892    
Weighted-Average Expected Useful Life (in years) 11 years