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SEGMENT INFORMATION - Segment Results (Details) $ in Thousands			12 Months Ended
	Apr. 26, 2020 employee	Apr. 15, 2020 employee	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Reportable segment results
Revenues			$ 1,328,129	$ 1,961,720	$ 2,002,857
Segment Adjusted EBITDA Expense			861,249	1,204,896	1,211,800
Segment Adjusted EBITDA			446,489	672,001	715,691
Total assets			2,166,016	2,586,694	2,394,748
Capital expenditures			121,101	305,858	233,480
Gibson County mining complex
Segment Information
Number of employees terminated | employee		116
Hamilton mining complex
Segment Information
Number of employees terminated | employee	78
Illinois Basin
Reportable segment results
Revenues			770,051	1,236,308	1,321,089
Segment Adjusted EBITDA Expense			520,324	756,423	796,370
Segment Adjusted EBITDA			236,911	385,200	417,773
Total assets			1,018,916	1,373,516	1,380,912
Capital expenditures			48,648	189,270	166,468
Appalachia
Reportable segment results
Revenues			500,330	644,389	643,965
Segment Adjusted EBITDA Expense			319,730	423,623	398,243
Segment Adjusted EBITDA			172,288	215,950	240,286
Total assets			448,567	500,027	440,518
Capital expenditures			70,960	111,739	64,037
Minerals
Reportable segment results
Revenues			43,141	53,036
Segment Adjusted EBITDA Expense			4,106	7,811
Segment Adjusted EBITDA			39,773	46,997	21,323
Total assets			613,916	643,213	161,312
Other and Corporate
Reportable segment results
Revenues			25,124	56,850	81,492
Segment Adjusted EBITDA Expense			18,543	36,845	52,321
Segment Adjusted EBITDA			6,580	32,911	44,864
Total assets			477,469	541,261	589,010
Capital expenditures			1,493	4,849	2,975
Operating segments
Reportable segment results
Revenues			1,328,129	1,961,720	2,002,857
Operating segments | Illinois Basin
Reportable segment results
Revenues			770,051	1,219,618	1,289,898
Operating segments | Appalachia
Reportable segment results
Revenues			500,330	644,389	643,898
Operating segments | Minerals
Reportable segment results
Revenues			43,141	53,036
Operating segments | Other and Corporate
Reportable segment results
Revenues			14,607	44,677	69,061
Elimination
Reportable segment results
Revenues			(10,517)	(28,863)	(43,689)
Segment Adjusted EBITDA Expense			(1,454)	(19,806)	(35,134)
Segment Adjusted EBITDA			(9,063)	(9,057)	(8,555)
Total assets			(392,852)	(471,323)	(177,004)
Elimination | Illinois Basin
Reportable segment results
Revenues				16,690	31,191
Elimination | Appalachia
Reportable segment results
Revenues					67
Elimination | Other and Corporate
Reportable segment results
Revenues			$ 10,517	$ 12,173	$ 12,431

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