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
6 Months Ended
Jun. 30, 2018
Jun. 12, 2017
Business Acquisition    
Total intangible assets subject to amortization $ 3,659  
Total 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