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Revenue from Contracts with Customers (Tables)

6 Months Ended

Jun. 30, 2025

Revenue from Contract with Customer [Abstract]

Schedule of disaggregation of revenues by type


		Coal Operations						Royalties						Other,
		Illinois												Corporate and
		Basin			Appalachia			Oil & Gas			Coal			Elimination			Consolidated

		(in thousands)
Three Months Ended June 30, 2025

Coal sales		$	343,841		$	141,628		$	—		$	—		$	—		$	485,469
Oil & gas royalties			—			—			35,473			—			—			35,473
Coal royalties			—			—			—			17,612			(17,612)			—
Transportation revenues			4,829			3,729			—			—			—			8,558
Other revenues			1,577			626			28			—			15,732			17,963
Total revenues		$	350,247		$	145,983		$	35,501		$	17,612		$	(1,880)		$	547,463

Three Months Ended June 30, 2024

Coal sales		$	331,973		$	180,686		$	—		$	—		$	—		$	512,659
Oil & gas royalties			—			—			36,429			—			—			36,429
Coal royalties			—			—			—			16,584			(16,584)			—
Transportation revenues			20,570			6,131			—			—			—			26,701
Other revenues			2,218			1,395			8			3			13,937			17,561
Total revenues		$	354,761		$	188,212		$	36,437		$	16,587		$	(2,647)		$	593,350

Six Months Ended June 30, 2025

Coal sales		$	677,075		$	276,905		$	—		$	—		$	—		$	953,980
Oil & gas royalties			—			—			71,557			—			—			71,557
Coal royalties			—			—			—			33,407			(33,407)			—
Transportation revenues			11,692			7,066			—			—			—			18,758
Other revenues			4,475			1,508			857			—			36,796			43,636
Total revenues		$	693,242		$	285,479		$	72,414		$	33,407		$	3,389		$	1,087,931

Six Months Ended June 30, 2024

Coal sales		$	702,603		$	371,935		$	—		$	—		$	—		$	1,074,538
Oil & gas royalties			—			—			73,459			—			—			73,459
Coal royalties			—			—			—			35,286			(35,286)			—
Transportation revenues			45,046			12,408			—			—			—			57,454
Other revenues			4,953			1,883			323			9			32,428			39,596
Total revenues		$	752,602		$	386,226		$	73,782		$	35,295		$	(2,858)		$	1,245,047

Schedule of trade receivables


		Three Months Ended						Six Months Ended
		June 30,						June 30,
		2025			2024			2025			2024

								(in thousands)
Beginning balance		$	177,467		$	272,191		$	166,829		$	282,622
Ending balance		$	177,659		$	226,436		$	177,659		$	226,436

Schedule of current coal supply contracts


											2028 and
		2025			2026			2027			Thereafter			Total

		(in thousands)

Illinois Basin Coal Operations coal revenues		$	609,685		$	1,036,588		$	653,033		$	739,113		$	3,038,419
Appalachia Coal Operations coal revenues			350,752			135,861			62,005			27,000			575,618
Total coal revenues (1)		$	960,437		$	1,172,449		$	715,038		$	766,113		$	3,614,037

(1) Coal revenues generally consists of consolidated revenues excluding our Oil & Gas Royalties segment as well as intercompany revenues from our Coal Royalties segment.