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Business Segment Information - Segment Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]    
Assets $ 94,157 $ 107,296
Operating Segments | Refined Coal    
Segment Reporting Information [Line Items]    
Assets 5,069 6,310
Operating Segments | Emissions Control    
Segment Reporting Information [Line Items]    
Assets 31,067 24,551
All Other and Corporate    
Segment Reporting Information [Line Items]    
Assets $ 58,021 $ 76,435