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Equity Method Investments - Equity Method Investments (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Feb. 10, 2014 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract] |  |  |  |  |  |  |  |  |
ADES equity earnings |  | $ (41) |  |  | $ 5,603 |  |  | $ 5,133 | $ 22,019
Capital calls and variable payments |  |  |  |  |  |  |  | 1,083 | 5,132
Equity Method Investment, Financial Statement, Reported Amounts [Abstract] |  |  |  |  |  |  |  |  |
Distributions from equity method investees, return on investment |  |  |  |  |  |  |  | 2,519 | 1,259
Earnings (loss) from equity method investments |  | (41) |  |  | 5,603 |  |  | 5,133 | 22,019
Included in investing cash flows |  |  |  |  |  |  |  | 4,730 | 22,547
Clean Coal Solutions (CCS) |  |  |  |  |  |  |  |  |
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract] |  |  |  |  |  |  |  |  |
Gross profit (loss) |  | 25,035 |  |  | 23,075 |  |  | 80,869 | 60,580
Operating expenses |  | 5,369 |  |  | 4,856 |  |  | 17,872 | 14,275
Income (loss) from operations |  | 19,666 |  |  | 18,219 |  |  | 62,997 | 46,305
Other expenses |  | (1,464) |  |  | (483) |  |  | (1,794) | (1,224)
Class B preferred return |  | (1,463) |  |  | (2,176) |  |  | (4,825) | (6,759)
Loss attributable to noncontrolling interest |  | 3,698 |  |  | 4,163 |  |  | 6,811 | 7,164
Net income (loss) available to Class A members |  | 20,437 |  |  | 19,723 |  |  | 63,189 | 45,486
ADES equity earnings |  | 0 | $ 4,630 | $ 100 | 6,226 | $ 9,733 | $ 6,588 | 4,730 | 22,547
Equity Method Investment, Financial Statement, Reported Amounts [Abstract] |  |  |  |  |  |  |  |  |
Earnings (loss) from equity method investments |  | 0 | 4,630 | 100 | 6,226 | 9,733 | 6,588 | 4,730 | 22,547
Included in investing cash flows |  | 0 | $ 4,630 | $ 100 | 6,226 | $ 9,733 | $ 6,588 |  |
Clean Coal Solutions Services (CCSS) |  |  |  |  |  |  |  |  |
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract] |  |  |  |  |  |  |  |  |
Gross profit (loss) |  | (11,616) |  |  | (5,247) |  |  | (31,511) | (14,064)
Operating expenses |  | 41,322 |  |  | 25,082 |  |  | 120,269 | 68,463
Income (loss) from operations |  | (52,938) |  |  | (30,329) |  |  | (151,780) | (82,527)
Other expenses |  | (7) |  |  | (34) |  |  | (86) | (57)
Loss attributable to noncontrolling interest |  | 55,661 |  |  | 32,147 |  |  | 158,926 | 87,642
Net income (loss) available to Class A members |  | 2,716 |  |  | 1,784 |  |  | 7,060 | 5,058
ADES equity earnings |  | 1,358 |  |  | 892 |  |  | 3,530 | 2,529
Equity Method Investment, Financial Statement, Reported Amounts [Abstract] |  |  |  |  |  |  |  |  |
Distributions from equity method investees, return on investment |  |  |  |  |  |  |  | 2,519 | 1,259
Earnings (loss) from equity method investments |  | 1,358 |  |  | 892 |  |  | 3,530 | 2,529
RMC6, LLC (RCM6) |  |  |  |  |  |  |  |  |
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract] |  |  |  |  |  |  |  |  |
Gross profit (loss) |  | (2,896) |  |  | (3,326) |  |  | (4,876) | (5,298)
Operating expenses |  | 590 |  |  | 581 |  |  | 1,567 | 1,447
Income (loss) from operations |  | (3,486) |  |  | (3,907) |  |  | (6,443) | (6,745)
Other expenses |  | (220) |  |  | (265) |  |  | (382) | (434)
Net income (loss) available to Class A members |  | (3,706) |  |  | (4,172) |  |  | (6,825) | (7,179)
ADES equity earnings |  | (1,399) |  |  | (1,515) |  |  | (3,127) | (3,057)
Capital calls and variable payments | $ 2,400 | 850 |  |  | 1,353 |  |  | 1,080 | 2,736
Equity Method Investment, Financial Statement, Reported Amounts [Abstract] |  |  |  |  |  |  |  |  |
Earnings (loss) from equity method investments |  | $ (1,399) |  |  | $ (1,515) |  |  | $ (3,127) | $ (3,057)

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