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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation of revenues
Revenues	$ 662,922	$ 463,422
Coal sales
Disaggregation of revenues
Revenues	578,784	388,360
Oil & gas royalties
Disaggregation of revenues
Revenues	34,497	33,396
Transportation
Disaggregation of revenues
Revenues	30,238	29,372
Other revenues
Disaggregation of revenues
Revenues	19,403	12,294
Operating segments | Illinois Basin Coal
Disaggregation of revenues
Revenues	360,406	274,696
Operating segments | Illinois Basin Coal | Coal sales
Disaggregation of revenues
Revenues	336,910	253,905
Operating segments | Illinois Basin Coal | Transportation
Disaggregation of revenues
Revenues	21,328	18,891
Operating segments | Illinois Basin Coal | Other revenues
Disaggregation of revenues
Revenues	2,168	1,900
Operating segments | Appalachia Coal
Disaggregation of revenues
Revenues	251,259	145,299
Operating segments | Appalachia Coal | Coal sales
Disaggregation of revenues
Revenues	241,874	134,455
Operating segments | Appalachia Coal | Transportation
Disaggregation of revenues
Revenues	8,910	10,481
Operating segments | Appalachia Coal | Other revenues
Disaggregation of revenues
Revenues	475	363
Operating segments | Oil & Gas Royalties
Disaggregation of revenues
Revenues	35,537	33,520
Operating segments | Oil & Gas Royalties | Oil & gas royalties
Disaggregation of revenues
Revenues	34,497	33,396
Operating segments | Oil & Gas Royalties | Other revenues
Disaggregation of revenues
Revenues	1,040	124
Operating segments | Coal Royalties
Disaggregation of revenues
Revenues	15,513	15,167
Operating segments | Coal Royalties | Coal royalties
Disaggregation of revenues
Revenues	15,513	15,167
Other, Corporate and Elimination
Disaggregation of revenues
Revenues	207	(5,260)
Other, Corporate and Elimination | Coal royalties
Disaggregation of revenues
Revenues	(15,513)	(15,167)
Other, Corporate and Elimination | Other revenues
Disaggregation of revenues
Revenues	15,720	9,907
Elimination
Disaggregation of revenues
Revenues	(15,513)	(15,167)
Elimination | Coal Royalties
Disaggregation of revenues
Revenues	$ 15,513	$ 15,167

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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