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Equity Method Investments - Results of Operations and Summary of Distributions (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]    
ADES equity earnings $ 8,273 $ 21,690
Equity Method Investment, Financial Statement, Reported Amounts [Abstract]    
Distributions from equity method investees, return on investment 17,116 19,488
Tinuum Group, LLC    
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]    
Gross profit (loss) 5,010 41,200
Operating, selling, general and administrative expenses 12,776 6,582
Loss (income) from operations (7,766) 34,618
Other income (expenses) 3,643 51
Loss attributable to noncontrolling interest 19,271 15,776
Net income available to members 15,148 50,445
ADES equity earnings 6,438 19,767
Equity Method Investment, Financial Statement, Reported Amounts [Abstract]    
Distributions from equity method investees, return on investment 13,764 16,788
Included in investing cash flows 13,764 16,788
Tinuum Services, LLC    
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]    
Gross profit (loss) (22,259) (24,735)
Operating, selling, general and administrative expenses 45,753 49,450
Loss (income) from operations (68,012) (74,185)
Other income (expenses) (285) (242)
Loss attributable to noncontrolling interest 71,972 78,270
Net income available to members 3,675 3,843
ADES equity earnings 1,838 1,922
Equity Method Investment, Financial Statement, Reported Amounts [Abstract]    
Distributions from equity method investees, return on investment 3,352 2,700
(Loss) earnings from other    
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]    
ADES equity earnings $ (3) $ 1