Business Segment, Geographic and Major Customer Information - Assets by Reportable Segments (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Assets	$ 349,743	$ 383,215
Held for sale	4,135	43,900
Operating Segments
Segment Reporting Information [Line Items]
Assets	345,608	339,315
Operating Segments | Energy Chemistry Technologies
Segment Reporting Information [Line Items]
Assets	187,623	184,328
Operating Segments | Consumer and Industrial Chemistry Technologies
Segment Reporting Information [Line Items]
Assets	113,434	98,105
Corporate and Other
Segment Reporting Information [Line Items]
Assets	$ 44,551	$ 56,882