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Equity Method Investments - Narrative (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 03, 2016 | Feb. 10, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Jan. 20, 2010
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  | $ 18,546 |  | $ 18,546 |  |  |  | $ 19,584 |  |  |  |
Capital calls and variable payments |  |  |  |  | 1,083 | $ 5,132 |  |  |  |  |  |  |
Purchase of membership interest, note payable outstanding |  |  | $ 15,690 |  | $ 15,690 |  |  |  | $ 15,910 |  |  |  |
Subsequent Event | RMC6, LLC (RCM6) | Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest, percent | 24.95% |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of ownership interest, including proceeds to third party | $ 1,800 |  |  |  |  |  |  |  |  |  |  |  |
Clean Coal Solutions (CCS) |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest, percent |  |  | 42.50% |  | 42.50% |  |  |  | 42.50% |  |  |  |
Equity method investments |  |  | $ 0 | $ 0 | $ 0 | 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 |
Clean Coal Solutions Services (CCSS) |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest, percent |  |  |  |  |  |  |  |  |  |  |  |  | 50.00%
Equity method investments |  |  | $ 5,200 |  | $ 5,200 |  |  |  | $ 4,100 |  |  |  |
Percent of losses removed from net income, attributable to noncontrolling interest |  |  | 100.00% |  | 100.00% |  |  |  |  |  |  |  |
RMC6, LLC (RCM6) |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest, percent |  | 24.95% | 24.95% |  | 24.95% |  |  |  | 24.95% |  |  |  |
Equity method investments |  |  | $ 13,400 |  | $ 13,400 |  |  |  | $ 15,400 |  |  |  |
Capital calls and variable payments |  | $ 2,400 | 850 | 1,353 | 1,080 | 2,736 |  |  |  |  |  |  |
Purchase of membership interest, note payable issued |  | $ 13,300 |  |  |  |  |  |  |  |  |  |  |
Purchase of membership interest, note payable outstanding |  |  | 14,400 |  | 14,400 |  |  |  | $ 14,200 |  |  |  |
Earnings (loss) from equity method investment for depreciation and amortization related to investment basis difference |  |  | $ 500 | $ 1,400 | $ 500 | $ 1,300 |  |  |  |  |  |  |

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