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Business Segment Information - Segment Operating Results (Details)
$ in Thousands
2 Months Ended 3 Months Ended 6 Months Ended
Mar. 03, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2015
segment
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Segment Reporting Information [Line Items]            
Number of reportable segments | segment       2    
Revenues:            
Earnings in equity method investments   $ 10,155 $ 13,754   $ 23,969 $ 19,331
Royalties   1,866 669   3,621 1,859
Equipment sales   24,619 8,213   29,727 29,919
Chemicals   846 613   3,127 1,047
Consulting services   0 125   0 320
Total reported revenues   25,465 8,951   32,854 31,286
Segment operating income:            
Total segment operating income   (1,850) (4,612)   (5,561) (7,945)
Gain on sale of equity method investment   0 0   0 2,078
453A interest   566 354   1,032 1,145
RCM6 note payable, related party   0 0   0 263
RMC6, LLC (RCM6)            
Revenues:            
Earnings in equity method investments $ (557) 0 0   0 (557)
Segment operating income:            
Gain on sale of equity method investment         2,100  
Refined Coal | RMC6, LLC (RCM6)            
Segment operating income:            
Gain on sale of equity method investment     2,100   2,100  
453A interest   600 400   1,000 1,100
RCM6 note payable, related party         0 300
Operating Segments            
Revenues:            
Total reported revenues   37,486 23,374   60,444 52,476
Segment operating income:            
Total segment operating income   13,020 16,317   28,318 28,761
Operating Segments | Refined Coal            
Revenues:            
Earnings in equity method investments   10,155 13,754   23,969 19,331
Royalties   1,866 669   3,621 1,859
Total reported revenues   12,021 14,423   27,590 21,190
Segment operating income:            
Total segment operating income   11,133 14,199   26,158 22,061
Operating Segments | Emissions Control            
Revenues:            
Equipment sales   24,619 8,213   29,727 29,919
Chemicals   846 613   3,127 1,047
Consulting services   0 125   0 320
Total reported revenues   25,465 8,951   32,854 31,286
Segment operating income:            
Total segment operating income   1,887 2,118   2,160 6,700
Intersegment Eliminations | Refined Coal            
Revenues:            
Earnings in equity method investments   (10,155) (13,754)   (23,969) (19,331)
Royalties   (1,866) (669)   (3,621) (1,859)
Total reported revenues   $ (12,021) $ (14,423)   $ (27,590) $ (21,190)