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SEGMENT INFORMATION - Segment Results (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) segment	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Segment Information
Number of reportable segments | segment			4
Reportable segment results
Revenues	$ 362,443	$ 255,202	$ 681,065	$ 605,965
Segment Adjusted EBITDA Expense	214,504	187,541	412,221	422,239
Segment Adjusted EBITDA	136,092	62,056	245,913	173,757
Total assets	2,115,513	2,285,628	2,115,513	2,285,628	$ 2,166,016
Capital expenditures	24,189	33,881	$ 55,626	84,245
Coal Operations
Segment Information
Number of reportable segments | segment			2
Number of mining complex | segment			7
Illinois Basin
Reportable segment results
Revenues	218,233	137,787	$ 409,167	341,659
Segment Adjusted EBITDA Expense	140,176	111,967	265,757	268,650
Segment Adjusted EBITDA	70,623	22,667	128,296	66,000
Total assets	726,555	814,972	726,555	814,972
Capital expenditures	12,515	14,029	28,916	40,258
Appalachia
Reportable segment results
Revenues	120,723	107,110	229,342	235,213
Segment Adjusted EBITDA Expense	74,456	74,227	148,182	154,145
Segment Adjusted EBITDA	41,641	30,279	73,147	77,581
Total assets	425,574	492,073	425,574	492,073
Capital expenditures	10,382	19,686	22,048	43,257
Oil & Gas Royalties
Reportable segment results
Revenues	17,587	7,847	31,607	22,110
Segment Adjusted EBITDA Expense	2,419	1,119	4,477	2,002
Segment Adjusted EBITDA	15,379	6,881	27,325	20,636
Total assets	604,355	628,308	604,355	628,308
Coal Royalties
Reportable segment results
Revenues	11,653	6,778	22,954	18,154
Segment Adjusted EBITDA Expense	4,871	3,021	8,899	7,488
Segment Adjusted EBITDA	6,782	3,757	14,055	10,666
Total assets	292,134	294,435	292,134	294,435
Other and Corporate
Reportable segment results
Revenues	8,547	4,955	16,315	12,334
Segment Adjusted EBITDA Expense	4,825	4,147	9,111	8,789
Segment Adjusted EBITDA	3,724	807	7,205	3,544
Total assets	489,271	473,119	489,271	473,119
Capital expenditures	1,292	166	4,662	730
Operating segments
Reportable segment results
Revenues	362,443	255,202	681,065	605,965
Operating segments | Illinois Basin
Reportable segment results
Revenues	218,233	137,787	409,167	341,659
Operating segments | Appalachia
Reportable segment results
Revenues	120,723	107,110	229,342	235,213
Operating segments | Oil & Gas Royalties
Reportable segment results
Revenues	17,587	7,847	31,607	22,110
Operating segments | Coal Royalties
Reportable segment results
Revenues				5
Operating segments | Other and Corporate
Reportable segment results
Revenues	5,900	2,458	10,949	6,978
Elimination
Reportable segment results
Revenues	(14,300)	(9,275)	(28,320)	(23,505)
Segment Adjusted EBITDA Expense	(12,243)	(6,940)	(24,205)	(18,835)
Segment Adjusted EBITDA	(2,057)	(2,335)	(4,115)	(4,670)
Total assets	(422,376)	(417,279)	(422,376)	(417,279)
Elimination | Coal Royalties
Reportable segment results
Revenues	11,653	6,778	22,954	18,149
Elimination | Other and Corporate
Reportable segment results
Revenues	$ 2,647	$ 2,497	$ 5,366	$ 5,356

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