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Business Segment Information - Segment Operating Results (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) segment | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  |  |  |  |  | 2 |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Earnings from equity method investments | $ 15,518 | $ 10,735 | $ 13,754 | $ 5,577 | $ 3,788 | $ (41) | $ 4,860 | $ 314 | $ 45,584 | $ 8,921 | $ 42,712
Equipment sales |  |  |  |  |  |  |  |  | 46,949 | 60,099 | 12,044
Consulting services |  |  |  |  |  |  |  |  | 648 | 1,752 | 4,488
Royalties, related party | 2,203 | 2,064 | 669 | 1,189 | 2,876 | 3,273 | 2,299 | 2,194 | 6,125 | 10,642 | 6,410
Chemicals |  |  |  |  |  |  |  |  | 3,025 | 888 | 391
Total reported revenues | 3,604 | 15,710 | 8,951 | 22,357 | 13,202 | 12,885 | 14,895 | 21,757 | 50,622 | 62,739 | 16,923
Segment reporting operating income (loss) |  |  |  |  |  |  |  |  |  |  |
Segment reporting operating income (loss) | $ (5,262) | $ (2,913) | $ (4,612) | $ (3,311) | $ (7,135) | $ (9,989) | $ (17,778) | $ (6,898) | (16,098) | (41,800) | (41,814)
Gain on sale of equity method investment |  |  |  |  |  |  |  |  | 2,078 | 0 | 0
453A interest |  |  |  |  |  |  |  |  | 2,490 | 4,639 | 3,371
Interest on RCM6 note payable, related party |  |  |  |  |  |  |  |  | 263 | 2,468 | 2,245
Gain on contract termination |  |  |  |  |  |  |  |  | 891 | 0 | 0
Operating Segments |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Total reported revenues |  |  |  |  |  |  |  |  | 102,331 | 82,302 | 66,045
Segment reporting operating income (loss) |  |  |  |  |  |  |  |  |  |  |
Segment reporting operating income (loss) |  |  |  |  |  |  |  |  | 58,598 | 4,548 | 28,746
Refined Coal | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Earnings from equity method investments |  |  |  |  |  |  |  |  | 45,584 | 8,921 | 42,712
Consulting services |  |  |  |  |  |  |  |  | 0 | 55 | 665
Royalties, related party |  |  |  |  |  |  |  |  | 6,125 | 10,642 | 6,410
Total reported revenues |  |  |  |  |  |  |  |  | 51,709 | 19,618 | 49,787
Segment reporting operating income (loss) |  |  |  |  |  |  |  |  |  |  |
Segment reporting operating income (loss) |  |  |  |  |  |  |  |  | 51,264 | 12,131 | 42,094
Refined Coal | Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Earnings from equity method investments |  |  |  |  |  |  |  |  | (45,584) | (8,921) | (42,712)
Royalties, related party |  |  |  |  |  |  |  |  | (6,125) | (10,642) | (6,410)
Total reported revenues |  |  |  |  |  |  |  |  | (51,709) | (19,563) | (49,122)
Emissions Control | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Equipment sales |  |  |  |  |  |  |  |  | 46,949 | 60,099 | 12,044
Consulting services |  |  |  |  |  |  |  |  | 648 | 1,697 | 3,823
Chemicals |  |  |  |  |  |  |  |  | 3,025 | 888 | 391
Total reported revenues |  |  |  |  |  |  |  |  | 50,622 | 62,684 | 16,258
Segment reporting operating income (loss) |  |  |  |  |  |  |  |  |  |  |
Segment reporting operating income (loss) |  |  |  |  |  |  |  |  | 7,334 | $ (7,583) | $ (13,348)
Gain on contract termination |  |  |  |  |  |  |  |  | $ 900 |  |

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