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SEGMENT INFORMATION - Segment Results (Details) $ in Thousands		3 Months Ended		9 Months Ended
	Apr. 15, 2020 employee	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Reportable segment results
Revenues		$ 355,651	$ 464,726	$ 961,616	$ 1,508,382
Segment Adjusted EBITDA Expense		216,750	289,081	638,989	911,535
Segment Adjusted EBITDA		132,701	156,163	306,458	528,070
Total assets		2,231,340	2,627,089	2,231,340	2,627,089	$ 2,586,694
Capital expenditures		18,575	75,515	102,820	241,142
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		210,360	280,335	552,019	965,404
Segment Adjusted EBITDA Expense		125,021	173,779	383,486	579,510
Segment Adjusted EBITDA		81,617	87,780	157,803	306,592
Total assets		1,082,992	1,418,008	1,082,992	1,418,008
Capital expenditures		3,815	49,829	44,073	157,759
Appalachia
Reportable segment results
Revenues		132,310	164,414	367,523	484,062
Segment Adjusted EBITDA Expense		86,447	107,990	240,116	312,861
Segment Adjusted EBITDA		43,358	55,178	121,416	167,612
Total assets		470,261	493,133	470,261	493,133
Capital expenditures		14,541	25,056	57,798	79,389
Minerals
Reportable segment results
Revenues		9,721	14,177	31,831	37,333
Segment Adjusted EBITDA Expense		849	2,517	2,851	6,109
Segment Adjusted EBITDA		8,898	12,202	29,534	32,432
Total assets		616,491	647,480	616,491	647,480
Other and Corporate
Reportable segment results
Revenues		6,070	13,123	18,409	43,275
Segment Adjusted EBITDA Expense		4,908	9,878	13,697	28,026
Segment Adjusted EBITDA		1,163	3,243	4,710	28,155
Total assets		468,590	561,171	468,590	561,171
Capital expenditures		219	630	949	3,994
Operating segments
Reportable segment results
Revenues		355,651	464,726	961,616	1,508,382
Operating segments | Illinois Basin
Reportable segment results
Revenues		210,360	276,042	552,019	952,941
Operating segments | Appalachia
Reportable segment results
Revenues		132,310	164,414	367,523	484,062
Operating segments | Minerals
Reportable segment results
Revenues		9,721	14,177	31,831	37,333
Operating segments | Other and Corporate
Reportable segment results
Revenues		3,260	10,093	10,243	34,046
Elimination
Reportable segment results
Revenues		(2,810)	(7,323)	(8,166)	(21,692)
Segment Adjusted EBITDA Expense		(475)	(5,083)	(1,161)	(14,971)
Segment Adjusted EBITDA		(2,335)	(2,240)	(7,005)	(6,721)
Total assets		(406,994)	(492,703)	(406,994)	(492,703)
Elimination | Illinois Basin
Reportable segment results
Revenues			4,293		12,463
Elimination | Other and Corporate
Reportable segment results
Revenues		$ 2,810	$ 3,030	$ 8,166	$ 9,229

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