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Revenue from Contracts with Customers - Disaggregation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024	Dec. 31, 2023
Disaggregation of revenues
Revenues	$ 571,367	$ 613,569	$ 1,659,298	$ 1,858,616
Trade receivables	169,883	198,647	169,883	198,647	$ 177,659	$ 166,829	$ 226,436	$ 282,622
Coal sales
Disaggregation of revenues
Revenues	511,593	532,647	1,465,573	1,607,185
Oil & gas royalties
Disaggregation of revenues
Revenues	32,055	34,448	103,612	107,907
Coal royalties
Disaggregation of revenues
Revenues	0	0	0	0
Transportation
Disaggregation of revenues
Revenues	7,701	24,617	26,459	82,071
Other revenues
Disaggregation of revenues
Revenues	20,018	21,857	63,654	61,453
Operating Segments
Disaggregation of revenues
Revenues	579,179	611,409	1,663,721	1,859,314
Operating Segments | Illinois Basin Coal
Disaggregation of revenues
Revenues	343,892	356,911	1,037,134	1,109,513
Operating Segments | Illinois Basin Coal | Coal sales
Disaggregation of revenues
Revenues	337,377	337,816	1,014,452	1,040,419
Operating Segments | Illinois Basin Coal | Oil & gas royalties
Disaggregation of revenues
Revenues	0	0	0	0
Operating Segments | Illinois Basin Coal | Coal royalties
Disaggregation of revenues
Revenues	0	0	0	0
Operating Segments | Illinois Basin Coal | Transportation
Disaggregation of revenues
Revenues	4,725	16,764	16,417	61,810
Operating Segments | Illinois Basin Coal | Other revenues
Disaggregation of revenues
Revenues	1,790	2,331	6,265	7,284
Operating Segments | Appalachia Coal
Disaggregation of revenues
Revenues	177,867	203,163	463,346	589,389
Operating Segments | Appalachia Coal | Coal sales
Disaggregation of revenues
Revenues	174,216	194,831	451,121	566,766
Operating Segments | Appalachia Coal | Oil & gas royalties
Disaggregation of revenues
Revenues	0	0	0	0
Operating Segments | Appalachia Coal | Coal royalties
Disaggregation of revenues
Revenues	0	0	0	0
Operating Segments | Appalachia Coal | Transportation
Disaggregation of revenues
Revenues	2,976	7,853	10,042	20,261
Operating Segments | Appalachia Coal | Other revenues
Disaggregation of revenues
Revenues	675	479	2,183	2,362
Operating Segments | Oil & Gas Royalties
Disaggregation of revenues
Revenues	32,758	34,688	105,172	108,470
Operating Segments | Oil & Gas Royalties | Coal sales
Disaggregation of revenues
Revenues	0	0	0	0
Operating Segments | Oil & Gas Royalties | Oil & gas royalties
Disaggregation of revenues
Revenues	32,055	34,448	103,612	107,907
Operating Segments | Oil & Gas Royalties | Coal royalties
Disaggregation of revenues
Revenues	0	0	0	0
Operating Segments | Oil & Gas Royalties | Transportation
Disaggregation of revenues
Revenues	0	0	0	0
Operating Segments | Oil & Gas Royalties | Other revenues
Disaggregation of revenues
Revenues	703	240	1,560	563
Operating Segments | Coal Royalties
Disaggregation of revenues
Revenues	24,662	16,647	58,069	51,942
Operating Segments | Coal Royalties | Coal sales
Disaggregation of revenues
Revenues	0	0	0	0
Operating Segments | Coal Royalties | Oil & gas royalties
Disaggregation of revenues
Revenues	0	0	0	0
Operating Segments | Coal Royalties | Coal royalties
Disaggregation of revenues
Revenues	24,662	16,647	58,069	51,933
Operating Segments | Coal Royalties | Transportation
Disaggregation of revenues
Revenues	0	0	0	0
Operating Segments | Coal Royalties | Other revenues
Disaggregation of revenues
Revenues	0	0	0	9
Other, Corporate and Elimination
Disaggregation of revenues
Revenues	(24,662)	(16,647)	(58,069)	(51,933)
Other, Corporate and Elimination | Other revenues
Disaggregation of revenues
Revenues	16,850	18,807	53,646	51,235
Corporate Reconciling Items and Eliminations [Member]
Disaggregation of revenues
Revenues	(7,812)	2,160	(4,423)	(698)
Corporate Reconciling Items and Eliminations [Member] | Coal sales
Disaggregation of revenues
Revenues	0	0	0	0
Corporate Reconciling Items and Eliminations [Member] | Oil & gas royalties
Disaggregation of revenues
Revenues	0	0	0	0
Corporate Reconciling Items and Eliminations [Member] | Coal royalties
Disaggregation of revenues
Revenues	(24,662)	(16,647)	(58,069)	(51,933)
Corporate Reconciling Items and Eliminations [Member] | Transportation
Disaggregation of revenues
Revenues	0	0	0	0
Corporate Reconciling Items and Eliminations [Member] | Other revenues
Disaggregation of revenues
Revenues	16,850	18,807	53,646	51,235
Elimination
Disaggregation of revenues
Revenues	24,662	16,647	58,069	51,933
Elimination | Illinois Basin Coal
Disaggregation of revenues
Revenues	0	0	0	0
Elimination | Appalachia Coal
Disaggregation of revenues
Revenues	0	0	0	0
Elimination | Oil & Gas Royalties
Disaggregation of revenues
Revenues	0	0	0	0
Elimination | Coal Royalties
Disaggregation of revenues
Revenues	$ 24,662	$ 16,647	$ 58,069	$ 51,933

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