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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of revenues
Revenues	$ 540,468	$ 651,697
Trade receivables	177,467	272,191	$ 166,829	$ 282,622
Coal sales
Disaggregation of revenues
Revenues	468,511	561,879
Oil & gas royalties
Disaggregation of revenues
Revenues	36,084	37,030
Coal royalties
Disaggregation of revenues
Revenues	540,468	651,697
Transportation
Disaggregation of revenues
Revenues	10,200	30,753
Other revenues
Disaggregation of revenues
Revenues	25,673	22,035
Coal Royalties
Disaggregation of revenues
Revenues	15,795	18,708
Operating Segments
Disaggregation of revenues
Revenues	535,199	651,908
Operating Segments | Illinois Basin Coal
Disaggregation of revenues
Revenues	342,995	397,841
Operating Segments | Illinois Basin Coal | Coal sales
Disaggregation of revenues
Revenues	333,234	370,630
Operating Segments | Illinois Basin Coal | Transportation
Disaggregation of revenues
Revenues	6,863	24,476
Operating Segments | Illinois Basin Coal | Other revenues
Disaggregation of revenues
Revenues	2,898	2,735
Operating Segments | Appalachia Coal
Disaggregation of revenues
Revenues	139,496	198,014
Operating Segments | Appalachia Coal | Coal sales
Disaggregation of revenues
Revenues	135,277	191,249
Operating Segments | Appalachia Coal | Transportation
Disaggregation of revenues
Revenues	3,337	6,277
Operating Segments | Appalachia Coal | Other revenues
Disaggregation of revenues
Revenues	882	488
Operating Segments | Oil & Gas Royalties
Disaggregation of revenues
Revenues	36,913	37,345
Operating Segments | Oil & Gas Royalties | Oil & gas royalties
Disaggregation of revenues
Revenues	36,084	37,030
Operating Segments | Oil & Gas Royalties | Other revenues
Disaggregation of revenues
Revenues	829	315
Operating Segments | Coal Royalties
Disaggregation of revenues
Revenues	15,795	18,708
Operating Segments | Coal Royalties | Coal royalties
Disaggregation of revenues
Revenues	15,795	18,702
Operating Segments | Coal Royalties | Other revenues
Disaggregation of revenues
Revenues		6
Other, Corporate and Elimination
Disaggregation of revenues
Revenues	(15,795)	(18,702)
Other, Corporate and Elimination | Other revenues
Disaggregation of revenues
Revenues	21,064	18,491
Corporate Reconciling Items and Eliminations [Member]
Disaggregation of revenues
Revenues	5,269	(211)
Corporate Reconciling Items and Eliminations [Member] | Coal royalties
Disaggregation of revenues
Revenues	(15,795)	(18,702)
Corporate Reconciling Items and Eliminations [Member] | Other revenues
Disaggregation of revenues
Revenues	21,064	18,491
Elimination
Disaggregation of revenues
Revenues	15,795	18,702
Elimination | Coal Royalties
Disaggregation of revenues
Revenues	$ 15,795	$ 18,702

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