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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)

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