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Business Segment, Geographic and Major Customer Information - Assets by Reportable Segments (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]    
Assets $ 281,043 $ 329,888
Held for sale 2,250 4,998
Operating Segments    
Segment Reporting Information [Line Items]    
Assets 278,793 324,890
Operating Segments | Energy Chemistry Technologies    
Segment Reporting Information [Line Items]    
Assets 130,673 172,799
Operating Segments | Consumer and Industrial Chemistry Technologies    
Segment Reporting Information [Line Items]    
Assets 133,543 116,600
Corporate and Other    
Segment Reporting Information [Line Items]    
Assets $ 14,577 $ 35,491