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Business Segment Information - Segment Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]    
Assets: $ 160,183 $ 173,799
Equity method investments 30,312 39,155
Operating Segments    
Segment Reporting Information [Line Items]    
Assets: 112,479 124,865
Operating Segments | Refined Coal    
Segment Reporting Information [Line Items]    
Assets: 33,940 43,953
Operating Segments | Power Generation and Industrials    
Segment Reporting Information [Line Items]    
Assets: 78,539 80,912
All Other and Corporate    
Segment Reporting Information [Line Items]    
Assets: $ 47,704 $ 48,934