Segment Information (Tables)

3 Months Ended

Mar. 31, 2026

Segment Reporting [Abstract]

Schedule of Segment Reporting Information by Segment

Reportable segment results for the three months ended March 31, 2026 are:

	High CV Thermal		Metallurgical		PRB		Core Marine Terminal		Total
Revenues from External Customers	$	552,832	$	342,335	$	175,180	$	8,502
Intersegment Revenues	—		—		—		15,710
	552,832		342,335		175,180		24,212		$	1,094,559
Reconciliation of Revenue:
Other Revenues (a)									5,429
Elimination of Intersegment Revenues									(15,710)
Total Consolidated Revenues									1,084,278
Less: (b)
Cash Costs of Revenue	327,825		226,305		162,596		8,230
Transportation Costs	99,373		67,787		3,707		—
Other Segment Items (c)	—		(9,723)		—		—
Adjusted EBITDA	$	125,634	$	57,966	$	8,877	$	15,982	$	208,459
Reconciliation of Segment Profit or Loss Measure to Consolidated Earnings Before Income Tax:
Other Profit or Loss (a)									1,389
Depreciation, Depletion and Amortization									(146,295)
General and Administrative Costs									(36,079)
Interest Expense									(11,192)
Interest Income									4,748
Non-Service Related Pension and Postretirement Benefit Costs									(5,653)
Closed and Idle Mine Costs									(4,480)
Other Operating Income, net									9,995
Other Costs									(275)
Earnings Before Income Tax									$	20,617

(a) Revenue and profit or loss from segments below the quantitative thresholds are attributable to the revenue and expense from various corporate and diversified business activities excluded from our reportable segments.

(b) The significant expense categories and amounts align with the segment-level information that is regularly provided to the CODM.

(c) Other segment items include other non-operating income and expenses that are not part of each segment’s ongoing operations.

	High CV Thermal		Metallurgical		PRB		Core Marine Terminal		Corporate and Other (a)		Consolidated
Segment Assets (b)	$	2,117,031	$	1,975,095	$	254,984	$	93,550	$	1,615,261	$	6,055,921
Depreciation, Depletion and Amortization	$	52,676	$	70,861	$	8,300	$	1,479	$	12,979	$	146,295
Capital Expenditures	$	50,332	$	13,700	$	751	$	2,589	$	5,725	$	73,097

(a) Includes various corporate and diversified business activities excluded from our reportable segments to reconcile to consolidated totals.

(b) Represents assets as of March 31, 2026.

Reportable segment results for the three months ended March 31, 2025 are:

	High CV Thermal		Metallurgical		PRB		Core Marine Terminal		Total
Revenues from External Customers	$	542,086	$	304,580	$	162,589	$	4,956
Intersegment Revenues	—		—		—		16,270
	542,086		304,580		162,589		21,226		$	1,030,481
Reconciliation of Revenue:
Other Revenues (a)									3,195
Elimination of Intersegment Revenues									(16,270)
Total Consolidated Revenues									1,017,406
Less: (b)
Cash Costs of Revenue	303,561		210,775		133,158		7,825
Transportation Costs	93,729		76,982		2,740		—
Other Segment Items (c)	—		36,406		—		—
Adjusted EBITDA	$	144,796	$	(19,583)	$	26,691	$	13,401	$	165,305
Reconciliation of Segment Profit or Loss Measure to Consolidated Loss Before Income Tax:
Other Profit or Loss (a)									368
Depreciation, Depletion and Amortization									(121,556)
General and Administrative Costs									(89,323)
Interest Expense									(8,019)
Interest Income									6,318
Loss on Debt Extinguishment									(11,680)
Non-Service Related Pension and Postretirement Benefit Costs									(6,202)
Closed and Idle Mine Costs									(4,644)
Other Operating Income, net									9,859
Other Costs									(13,919)
Loss Before Income Tax									$	(73,493)

(a) Revenue and profit or loss from segments below the quantitative thresholds are attributable to the revenue and expense from various corporate and diversified business activities excluded from our reportable segments.

(b) The significant expense categories and amounts align with the segment-level information that is regularly provided to the CODM.

(c) Other segment items include other non-operating income and expenses that are not part of each segment’s ongoing operations.

	High CV Thermal		Metallurgical		PRB		Core Marine Terminal		Corporate and Other (a)		Consolidated
Segment Assets (b)	$	2,252,607	$	1,766,112	$	304,455	$	87,496	$	1,841,276	$	6,251,946
Depreciation, Depletion and Amortization	$	51,290	$	45,889	$	10,780	$	1,379	$	12,218	$	121,556
Capital Expenditures	$	33,995	$	23,964	$	2,496	$	1,242	$	3,125	$	64,822

(a) Includes various corporate and diversified business activities excluded from our reportable segments to reconcile to consolidated totals.

(b) Represents assets as of March 31, 2025.