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Revenue from Contracts with Customers - Disaggregation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Disaggregation of revenues
Revenues	$ 547,463	$ 593,350	$ 1,087,931	$ 1,245,047
Trade receivables	177,659	226,436	177,659	226,436	$ 177,467	$ 166,829	$ 272,191	$ 282,622
Coal sales
Disaggregation of revenues
Revenues	485,469	512,659	953,980	1,074,538
Oil & gas royalties
Disaggregation of revenues
Revenues	35,473	36,429	71,557	73,459
Coal royalties
Disaggregation of revenues
Revenues	0	0	0	0
Transportation
Disaggregation of revenues
Revenues	8,558	26,701	18,758	57,454
Other revenues
Disaggregation of revenues
Revenues	17,963	17,561	43,636	39,596
Operating Segments
Disaggregation of revenues
Revenues	549,343	595,997	1,084,542	1,247,905
Operating Segments | Illinois Basin Coal
Disaggregation of revenues
Revenues	350,247	354,761	693,242	752,602
Operating Segments | Illinois Basin Coal | Coal sales
Disaggregation of revenues
Revenues	343,841	331,973	677,075	702,603
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	4,829	20,570	11,692	45,046
Operating Segments | Illinois Basin Coal | Other revenues
Disaggregation of revenues
Revenues	1,577	2,218	4,475	4,953
Operating Segments | Appalachia Coal
Disaggregation of revenues
Revenues	145,983	188,212	285,479	386,226
Operating Segments | Appalachia Coal | Coal sales
Disaggregation of revenues
Revenues	141,628	180,686	276,905	371,935
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	3,729	6,131	7,066	12,408
Operating Segments | Appalachia Coal | Other revenues
Disaggregation of revenues
Revenues	626	1,395	1,508	1,883
Operating Segments | Oil & Gas Royalties
Disaggregation of revenues
Revenues	35,501	36,437	72,414	73,782
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	35,473	36,429	71,557	73,459
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	28	8	857	323
Operating Segments | Coal Royalties
Disaggregation of revenues
Revenues	17,612	16,587	33,407	35,295
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	17,612	16,584	33,407	35,286
Operating Segments | Coal Royalties | Transportation
Disaggregation of revenues
Revenues	0	0	0	0
Operating Segments | Coal Royalties | Other revenues
Disaggregation of revenues
Revenues	0	3	0	9
Other, Corporate and Elimination
Disaggregation of revenues
Revenues	(17,612)	(16,584)	(33,407)	(35,286)
Other, Corporate and Elimination | Other revenues
Disaggregation of revenues
Revenues	15,732	13,937	36,796	32,428
Corporate Reconciling Items and Eliminations [Member]
Disaggregation of revenues
Revenues	(1,880)	(2,647)	3,389	(2,858)
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	(17,612)	(16,584)	(33,407)	(35,286)
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	15,732	13,937	36,796	32,428
Elimination
Disaggregation of revenues
Revenues	17,612	16,584	33,407	35,286
Elimination | Coal Royalties
Disaggregation of revenues
Revenues	$ 17,612	$ 16,584	$ 33,407	$ 35,286

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Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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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.

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