Business Segment, Geographic and Major Customer Information - Assets by Reportable Segments (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Assets	$ 377,050	$ 383,215
Held for sale	27,891	43,900
Operating Segments
Segment Reporting Information [Line Items]
Assets	349,159	339,315
Operating Segments | Energy Chemistry Technologies
Segment Reporting Information [Line Items]
Assets	196,155	184,328
Operating Segments | Consumer and Industrial Chemistry Technologies
Segment Reporting Information [Line Items]
Assets	106,850	98,105
Corporate and Other
Segment Reporting Information [Line Items]
Assets	$ 46,154	$ 56,882