Alpha Metallurgical Resources (AMR) 10-Q 8 May 23 2023 Q1 Quarterly report Financial data

Cover Page

Cover Page - shares	3 Months Ended
	Mar. 31, 2023	Apr. 30, 2023
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2023
Document Transition Report	false
Entity File Number	001-38735
Entity Registrant Name	ALPHA METALLURGICAL RESOURCES, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	81-3015061
Entity Address, Address Line One	340 Martin Luther King Jr. Blvd.
Entity Address, City or Town	Bristol
Entity Address, State or Province	TN
Entity Address, Postal Zip Code	37620
City Area Code	423
Local Phone Number	573-0300
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Title of 12(b) Security	Common Stock
Trading Symbol	AMR
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding		14,473,756
Entity Central Index Key	0001704715
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q1
Amendment Flag	false

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Revenues:
Coal revenues	$ 906,698	$ 1,069,738
Other revenues	4,537	2,226
Total revenues	911,235	1,071,964
Costs and expenses:
Cost of coal sales (exclusive of items shown separately below)	539,137	555,342
Depreciation, depletion and amortization	29,423	28,035
Accretion on asset retirement obligations	6,377	5,954
Amortization of acquired intangibles, net	2,197	5,748
Selling, general and administrative expenses (exclusive of depreciation, depletion and amortization shown separately above)	20,692	15,086
Total other operating loss (income):
Mark-to-market adjustment for acquisition-related obligations	0	9,361
Other income	(1,092)	(628)
Total costs and expenses	596,734	618,898
Income from operations	314,501	453,066
Other (expense) income:
Interest expense	(1,720)	(13,083)
Interest income	1,518	184
Equity loss in affiliates	(1,748)	(1,361)
Miscellaneous income, net	631	1,676
Total other expense, net	(1,319)	(12,584)
Income before income taxes	313,182	440,482
Income tax expense	(42,411)	(39,591)
Net income	$ 270,771	$ 400,891
Basic income per common share (in dollars per share)	$ 17.74	$ 21.58
Diluted income per common share (in dollars per share)	$ 17.01	$ 20.52
Weighted average shares - basic (in shares)	15,266,895	18,574,026
Weighted average shares - diluted (in shares)	15,916,378	19,540,642

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Other Comprehensive Income [Abstract]
Net income	$ 270,771	$ 400,891
Employee benefit plans:
Amortization of and adjustments to employee benefit costs	(627)	775
Income tax expense	139	0
Total other comprehensive (loss) income, net of tax	(488)	775
Total comprehensive income	$ 270,283	$ 401,666

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 222,507	$ 301,906
Short-term investments	0	46,052
Trade accounts receivable, net of allowance for doubtful accounts of $369 and $239 as of March 31, 2023 and December 31, 2022, respectively	546,252	407,210
Inventories, net	266,678	200,574
Short-term deposits	6,602	84,748
Short-term restricted cash	0	24,547
Prepaid expenses and other current assets	50,448	49,384
Total current assets	1,092,487	1,114,421
Property, plant, and equipment, net of accumulated depreciation and amortization of $503,403 and $491,186 as of March 31, 2023 and December 31, 2022, respectively	486,721	442,645
Owned and leased mineral rights, net of accumulated depletion and amortization of $83,313 and $77,333 as of March 31, 2023 and December 31, 2022, respectively	458,191	451,062
Other acquired intangibles, net of accumulated amortization of $43,236 and $53,719 as of March 31, 2023 and December 31, 2022, respectively	52,905	55,102
Long-term restricted investments	90,428	105,735
Long-term restricted cash	50,931	28,941
Deferred income taxes	10,497	11,378
Other non-current assets	106,957	103,195
Total assets	2,349,117	2,312,479
Current liabilities:
Current portion of long-term debt	3,562	3,078
Trade accounts payable	122,738	106,037
Acquisition-related obligations – current	381	28,254
Accrued expenses and other current liabilities	189,927	265,256
Total current liabilities	316,608	402,625
Long-term debt	8,379	7,897
Workers’ compensation and black lung obligations	185,204	188,247
Pension obligations	102,700	110,836
Asset retirement obligations	144,851	142,048
Deferred income taxes	24,286	10,874
Other non-current liabilities	18,514	20,197
Total liabilities	800,542	882,724
Commitments and Contingencies (Note 15)
Stockholders’ Equity
Preferred stock - par value $0.01, 5.0 million shares authorized, none issued	0	0
Common stock - par value $0.01, 50.0 million shares authorized, 21.8 million issued and 14.8 million outstanding at March 31, 2023 and 21.7 million issued and 15.5 million outstanding at December 31, 2022	218	217
Additional paid-in capital	813,299	815,442
Accumulated other comprehensive loss	(12,650)	(12,162)
Treasury stock, at cost: 7.0 million shares at March 31, 2023 and 6.2 million shares at December 31, 2022	(791,557)	(649,061)
Retained earnings	1,539,265	1,275,319
Total stockholders’ equity	1,548,575	1,429,755
Total liabilities and stockholders’ equity	$ 2,349,117	$ 2,312,479

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 369	$ 239
Property, plant and equipment, accumulated amortization, depreciation and amortization	503,403	491,186
Owned and lease mineral rights, accumulated depletion and amortization	83,313	77,333
Other acquired intangibles, accumulated amortization	$ 43,236	$ 53,719
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued (in shares)	21,800,000	21,700,000
Common stock, shares outstanding (in shares)	14,800,000	15,500,000
Treasury stock, shares at cost (in shares)	7,000,000	6,200,000

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating activities:
Net income	$ 270,771	$ 400,891
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	29,423	28,035
Amortization of acquired intangibles, net	2,197	5,748
Amortization of debt issuance costs and accretion of debt discount	534	3,679
Mark-to-market adjustment for acquisition-related obligations	0	9,361
Gain on disposal of assets	(2,363)	(636)
Accretion on asset retirement obligations	6,377	5,954
Employee benefit plans, net	3,261	(174)
Deferred income taxes	14,432	4,676
Stock-based compensation	3,034	1,182
Equity loss in affiliates	1,748	1,361
Other, net	126	135
Changes in operating assets and liabilities	(152,153)	(124,087)
Net cash provided by operating activities	177,387	336,125
Investing activities:
Capital expenditures	(74,248)	(28,146)
Proceeds on disposal of assets	3,478	917
Cash paid for business acquired	(11,919)	0
Purchases of investment securities	(141,750)	(50)
Sales and maturities of investment securities	204,660	28,438
Capital contributions to equity affiliates	(8,124)	(3,468)
Other, net	12	(1,243)
Net cash used in investing activities	(27,891)	(3,552)
Financing activities:
Principal repayments of long-term debt	(438)	(200,461)
Dividend and dividend equivalents paid	(85,979)	0
Common stock repurchases and related expenses	(144,919)	(21,844)
Proceeds from exercise of warrants	222	2,257
Other, net	(338)	348
Net cash used in financing activities	(231,452)	(219,700)
Net (decrease) increase in cash and cash equivalents and restricted cash	(81,956)	112,873
Cash and cash equivalents and restricted cash at beginning of period	355,394	182,614
Cash and cash equivalents and restricted cash at end of period	273,438	295,487
Supplemental disclosure of noncash investing and financing activities:
Financing leases and capital financing - equipment	1,753	736
Accrued capital expenditures	13,703	9,529
Accrued common stock repurchases	5,995	1,996
Dividends declared	6,825	0
Reconciliation of Cash and Cash Equivalents and Restricted Cash
Cash and cash equivalents	222,507	159,455
Short-term restricted cash	0	17,556
Long-term restricted cash	50,931	118,476
Total cash and cash equivalents and restricted cash shown in the Condensed Consolidated Statements of Cash Flows	$ 273,438	$ 295,487

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive (Loss) Income	Treasury Stock at Cost	(Accumulated Deficit) Retained Earnings
Beginning balance at Dec. 31, 2021	$ 546,909	$ 208	$ 784,743	$ (58,503)	$ (107,800)	$ (71,739)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	400,891					400,891
Other comprehensive income (loss), net	775			775
Stock-based compensation, issuance of common stock for share vesting, and common stock reissuances	1,182	1	(391)		1,572
Exercise of stock options	891		891
Common stock repurchases and related expenses	(23,840)				(23,840)
Warrants exercises	3,039	1	3,038
Ending balance at Mar. 31, 2022	929,847	210	788,281	(57,728)	(130,068)	329,152
Beginning balance at Dec. 31, 2022	1,429,755	217	815,442	(12,162)	(649,061)	1,275,319
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	270,771					270,771
Other comprehensive income (loss), net	(488)			(488)
Stock-based compensation, issuance of common stock for share vesting, and common stock reissuances	3,034	1	(3,444)		6,477
Common stock repurchases and related expenses	(148,973)				(148,973)
Warrants exercises	1,301		1,301
Cash dividend and dividend equivalents declared ($0.44 per share)	(6,825)					(6,825)
Ending balance at Mar. 31, 2023	$ 1,548,575	$ 218	$ 813,299	$ (12,650)	$ (791,557)	$ 1,539,265

CONDENSED CONSOLIDATED STATEM_5

CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited) (Parenthetical) - $ / shares		3 Months Ended
	Feb. 21, 2023	Mar. 31, 2023
Statement of Stockholders' Equity [Abstract]
Dividend per share (in dollars per share)	$ 0.44	$ 0.44

Business and Basis of Presentat

Business and Basis of Presentation	3 Months Ended
	Mar. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business and Basis of Presentation	Business and Basis of Presentation Business Alpha is a Tennessee-based mining company with operations across Virginia and West Virginia. With customers across the globe, high-quality reserves and significant port capacity, Alpha is a leading U.S. supplier of metallurgical coal products for the steel industry. Basis of Presentation Together, the condensed consolidated statements of operations, comprehensive income, balance sheets, cash flows and stockholders’ equity for the Company are referred to as the “Condensed Consolidated Financial Statements.” The Condensed Consolidated Financial Statements are also referenced across periods as “Condensed Consolidated Statements of Operations,” “Condensed Consolidated Statements of Comprehensive Income,” “Condensed Consolidated Balance Sheets,” “Condensed Consolidated Statements of Cash Flows,” and “Condensed Consolidated Statements of Stockholders’ Equity.” The Condensed Consolidated Financial Statements include all wholly-owned subsidiaries’ results of operations for the three months ended March 31, 2023 and 2022. All significant intercompany transactions have been eliminated in consolidation. The accompanying interim Condensed Consolidated Financial Statements are unaudited and have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) and in accordance with the rules and regulations of the United States Securities and Exchange Commission (“SEC”) for Form 10-Q. Such rules and regulations allow the omission of certain information and footnote disclosures normally included in the financial statements prepared in accordance with U.S. GAAP as long as the financial statements are not misleading. In the opinion of management, these interim Condensed Consolidated Financial Statements reflect all normal and recurring adjustments necessary for a fair presentation of the results for the periods presented. Results of operations for the three months ended March 31, 2023 are not necessarily indicative of the results to be expected for the year ending December 31, 2023 or any other period. These interim Condensed Consolidated Financial Statements should be read in conjunction with the Company’s Consolidated Financial Statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2022. Reclassifications Certain immaterial amounts for the three months ended March 31, 2022 in the Condensed Consolidated Financials Statements and notes to the Condensed Consolidated Financials Statements have been recast to reclassify discontinued operations and present the related amounts within continuing operations as part of the All Other category. Recent Accounting Guidance There are no new pronouncements issued but not yet effective expected to have a material impact on the Company’s financial position, results of operations, or liquidity.

Revenue

Revenue	3 Months Ended
	Mar. 31, 2023
Revenue from Contract with Customer [Abstract]
Revenue	Revenue Disaggregation of Revenue from Contracts with Customers The Company earns revenues primarily through the sale of coal produced at Company operations and coal purchased from third parties. The Company extracts, processes and markets met and thermal coal from deep and surface mines for sale to steel and coke producers, industrial customers, and electric utilities. The Company has disaggregated revenue between met coal and thermal coal and export and domestic revenues which depicts the pricing and contract differences between the two. Export revenue generally is derived by spot or short-term contracts with pricing determined at the time of shipment or based on a market index, whereas domestic revenue is characterized by contracts that typically have a term of one year or longer and typically the pricing is fixed. The following tables disaggregate the Company’s coal revenues by product category and by market to depict how the nature, amount, timing, and uncertainty of the Company’s coal revenues and cash flows are affected by economic factors: Three Months Ended March 31, 2023 Met Coal Thermal Coal Total Export coal revenues $ 647,932 $ 30,199 $ 678,131 Domestic coal revenues 210,047 18,520 228,567 Total coal revenues $ 857,979 $ 48,719 $ 906,698 Three Months Ended March 31, 2022 Met Coal Thermal Coal Total Export coal revenues $ 888,006 $ 6,519 $ 894,525 Domestic coal revenues 159,987 15,226 175,213 Total coal revenues $ 1,047,993 $ 21,745 $ 1,069,738 Performance Obligations The following table includes estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied as of March 31, 2023: Remainder of 2023 2024 2025 2026 2027 Total Estimated coal revenues $ 110,624 $ 37,250 $ — $ — $ — $ 147,874

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	3 Months Ended
	Mar. 31, 2023
Equity [Abstract]
Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss The following tables summarize the changes to accumulated other comprehensive loss during the three months ended March 31, 2023 and 2022: Balance January 1, 2023 Other comprehensive income (loss) before reclassifications Amounts reclassified from accumulated other comprehensive loss Balance March 31, 2023 Employee benefit costs $ (12,162) $ — $ (488) $ (12,650) Balance January 1, 2022 Other comprehensive income (loss) before reclassifications Amounts reclassified from accumulated other comprehensive loss Balance March 31, 2022 Employee benefit costs $ (58,503) $ — $ 775 $ (57,728) The following table summarizes the amounts reclassified from accumulated other comprehensive loss and the Condensed Consolidated Statements of Operations line items affected by the reclassification during the three months ended March 31, 2023 and 2022: Details about accumulated other comprehensive loss components Amounts reclassified from accumulated other comprehensive loss Affected line item in the Condensed Consolidated Statements of Operations Three Months Ended March 31, 2023 2022 Employee benefit costs: Amortization of net actuarial (gain) loss (1) $ (627) $ 784 Miscellaneous income, net Settlement (1) — (9) Miscellaneous income, net Total before income tax $ (627) $ 775 Income tax 139 — Income tax expense Total, net of income tax $ (488) $ 775 (1) These accumulated other comprehensive loss components are included in the computation of net periodic benefit costs for certain employee benefit plans. Refer to Note 13.

Net Income Per Share

Net Income Per Share	3 Months Ended
	Mar. 31, 2023
Earnings Per Share [Abstract]
Net Income Per Share	Net Income Per Share The number of shares used to calculate basic net income per common share is based on the weighted average number of the Company’s outstanding common shares during the respective period. The number of shares used to calculate diluted net income per common share is based on the number of common shares used to calculate basic net income per common share plus the dilutive effect of stock options and other stock-based instruments held by the Company’s employees and directors during the period, and the Company’s outstanding warrants. The dilutive effect of outstanding stock-based instruments is determined by application of the treasury stock method. The stock options and warrants become dilutive for diluted net income per common share calculations when the market price of the Company’s common stock exceeds the exercise price. Anti-dilution also occurs in periods of a net loss, and the dilutive impact of all warrants and share-based compensation awards are excluded. For the three months ended March 31, 2023 and 2022, no warrants, stock options, or other stock-based instruments were excluded from the computation of dilutive net income per common share because they would have been anti-dilutive. When applying the treasury stock method, anti-dilution generally occurs when the exercise prices or unrecognized compensation cost per share are higher than the Company’s average stock price during an applicable period. The following table presents the net income per common share for the three months ended March 31, 2023 and 2022: Three Months Ended March 31, 2023 2022 Basic Net income 270,771 400,891 Weighted average common shares outstanding - basic 15,266,895 18,574,026 Net income per common share - basic $ 17.74 $ 21.58 Diluted Weighted average common shares outstanding - basic 15,266,895 18,574,026 Diluted effect of warrants 158,304 443,273 Diluted effect of stock options 1,999 7,119 Diluted effect of other stock-based instruments 489,180 516,224 Weighted average common shares outstanding - diluted 15,916,378 19,540,642 Net income per common share - diluted $ 17.01 $ 20.52

Inventories, net

Inventories, net	3 Months Ended
	Mar. 31, 2023
Inventory Disclosure [Abstract]
Inventories, net	Inventories, net Inventories, net consisted of the following: March 31, 2023 December 31, 2022 Raw coal $ 54,848 $ 57,382 Saleable coal 152,383 91,474 Materials, supplies and other, net 59,447 51,718 Total inventories, net $ 266,678 $ 200,574

Capital Stock

Capital Stock	3 Months Ended
	Mar. 31, 2023
Equity [Abstract]
Capital Stock	Capital Stock Share Repurchase Program On February 21, 2023, the Company’s Board of Directors (the “Board”) approved a $200,000 increase to the existing common share repurchase program that the Board adopted on March 4, 2022, bringing the total authorization to repurchase the Company’s stock to $1,200,000. As of March 31, 2023, the Company had repurchased an aggregate of 4,414,451 shares under the plan for an aggregate purchase price of approximately $654,468 (comprised of $654,335 of share repurchases and $133 of related fees). The Company has also accrued a stock repurchase excise tax of $1,199 related to the share repurchase program as of March 31, 2023, which is recorded in treasury stock at cost. Dividend Program Pursuant to the dividend policy adopted by the Board on May 3, 2022, the Board declared the following quarterly cash dividend on the Company’s common stock during the three months ended March 31, 2023: Dividend per share Dividend Paid (1) Declaration Date Holders of Record Date Payable Date $ 0.44 $ 6,602 February 21, 2023 March 15, 2023 April 3, 2023 (1) Excludes dividend equivalents accrued of $223 as of March 31, 2023. As of March 31, 2023, a related $6,602 balance was held on deposit to facilitate the dividend payment on April 3, 2023. Refer to Note 17 for subsequent event disclosures related to the Company’s dividend program. Warrants On July 26, 2016, the Company issued 810,811 warrants, which are classified as equity instruments. Pursuant to the underlying warrants agreement, the warrants are exercisable for cash or on a cashless basis at any time until 5:00 p.m. Eastern Time on July 26, 2023, and no fractional shares shall be issued upon warrant exercises. Pursuant to the underlying warrants agreement, the exercise price was adjusted from $45.086 per share to $44.972 per share as of the March 15, 2023 dividend record date while the warrant share number remained unchanged, at 1.20. Refer to Note 17 for subsequent event disclosures related to the Company’s dividend program which could result in an additional adjustment to the warrants exercise price and warrants share number. As of March 31, 2023, 159,668 warrants remained outstanding, with a total of 191,602 shares underlying the un-exercised warrants. For the three months ended March 31, 2023, the Company issued 37,404 shares of common stock resulting from exercises of its warrants and, pursuant to the terms of the underlying warrants agreement, withheld 8,514 of the issued shares in satisfaction of the warrant exercise price and in lieu of fractional shares, which were subsequently reclassified as treasury stock in the amount of $1,075. As of March 31, 2022, 744,845 warrants were outstanding, with a total of 856,572 shares underlying the un-exercised warrants. For the three months ended March 31, 2022, the Company issued 64,861 shares of common stock resulting from exercises of its warrants and, pursuant to the terms of the underlying warrants agreement, withheld 91 of the issued shares in satisfaction of the warrant exercise price and in lieu of fractional shares, which were subsequently reclassified as treasury stock.

Accrued Expenses and Other Curr

Accrued Expenses and Other Current Liabilities	3 Months Ended
	Mar. 31, 2023
Payables and Accruals [Abstract]
Accrued Expenses and Other Current Liabilities	Accrued Expenses and Other Current Liabilities Accrued expenses and other current liabilities consisted of the following: March 31, 2023 December 31, 2022 Wages and benefits $ 55,739 $ 69,458 Workers’ compensation 11,651 11,651 Black lung 9,664 9,664 Taxes other than income taxes 30,820 24,959 Asset retirement obligations 36,543 36,963 Dividend payable 6,824 86,118 Income taxes payable 14,898 — Freight accrual 12,440 7,181 Other 11,348 19,262 Total accrued expenses and other current liabilities $ 189,927 $ 265,256

Long-Term Debt

Long-Term Debt	3 Months Ended
	Mar. 31, 2023
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt Long-term debt consisted of the following: March 31, 2023 December 31, 2022 Notes payable and other $ 6,972 $ 6,179 Financing leases 4,969 4,796 Total long-term debt $ 11,941 $ 10,975 Less current portion (3,562) (3,078) Long-term debt, net of current portion $ 8,379 $ 7,897 Second Amended and Restated Asset-Based Revolving Credit Agreement The Second Amended and Restated Asset-Based Revolving Credit Agreement (the “ABL Agreement”) includes a senior secured asset-based revolving credit facility (the “ABL Facility”). Under the ABL Facility, the Company may borrow cash or obtain letters of credit, on a revolving basis, in an aggregate amount of up to $155,000, of which no more than $150,000 may represent outstanding letters of credit ($125,000 on a committed basis and another $25,000 on an uncommitted cash collateralized basis) with the facility having a maturity date of December 6, 2024. As of March 31, 2023 and December 31, 2022, there were no outstanding borrowings under the ABL Facility. As of March 31, 2023 and December 31, 2022, the Company had $61,877 letters of credit outstanding under the ABL Facility. The ABL Agreement, as amended, and related documents contain negative and affirmative covenants including certain financial covenants. The Company is in compliance with all covenants under these agreements as of March 31, 2023.

Acquisition-Related Obligations

Acquisition-Related Obligations	3 Months Ended
	Mar. 31, 2023
Fair Value Disclosures [Abstract]
Acquisition-Related Obligations	Acquisition-Related Obligations Acquisition-related obligations consisted of the following: March 31, 2023 December 31, 2022 Contingent Revenue Obligation $ — $ 27,719 Environmental Settlement Obligation 381 535 Total acquisition-related obligations - current $ 381 $ 28,254

Asset Retirement Obligations

Asset Retirement Obligations	3 Months Ended
	Mar. 31, 2023
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligations	Asset Retirement Obligations The following table summarizes the changes in asset retirement obligations for the three months ended March 31, 2023: Total asset retirement obligations at December 31, 2022 $ 179,011 Accretion for the period 6,377 Revisions in estimated cash flows (31) Expenditures for the period (3,963) Total asset retirement obligations at March 31, 2023 181,394 Less current portion (1) (36,543) Long-term portion $ 144,851 (1) Included within Accrued expenses and other current liabilities on the Company’s Condensed Consolidated Balance Sheets. Refer to Note 7.

Fair Value of Financial Instrum

Fair Value of Financial Instruments and Fair Value Measurements	3 Months Ended
	Mar. 31, 2023
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments and Fair Value Measurements	Fair Value of Financial Instruments and Fair Value Measurements The estimated fair values of financial instruments are determined based on relevant market information. These estimates involve uncertainty and cannot be determined with precision. The carrying amounts for cash and cash equivalents, trade accounts receivable, net, prepaid expenses and other current assets, restricted cash, deposits, trade accounts payable, accrued expenses and other current liabilities, and environmental settlement obligations approximate fair value as of March 31, 2023 and December 31, 2022 due to the short maturity of these instruments. The following tables set forth by level, within the fair value hierarchy, the Company’s financial and non-financial assets and liabilities that were accounted for at fair value on a recurring basis as of March 31, 2023 and December 31, 2022. Financial and non-financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. The Company’s assessment of the significance of a particular input to the fair value measurement requires judgment, and may affect the determination of fair value for assets and liabilities and their placement within the fair value hierarchy levels. March 31, 2023 Total Fair Value Quoted Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Trading securities (1) $ 90,428 $ — $ 90,428 $ — (1) Classified as Long-term restricted investments on the Company’s Condensed Consolidated Balance Sheets. December 31, 2022 Total Fair Value Quoted Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Contingent Revenue Obligation $ 27,719 $ — $ — $ 27,719 Trading securities (1) $ 151,787 $ — $ 151,787 $ — (1) Includes $46,052 classified as Short-term investments and $105,735 classified as Long-term restricted investments on the Company’s Condensed Consolidated Balance Sheets. The following tables are reconciliations of the financial and non-financial assets and liabilities that were accounted for at fair value on a recurring basis and that were categorized within Level 3 of the fair value hierarchy: December 31, 2022 Payments Loss (Gain) Recognized in Earnings Transfer In (Out) of Level 3 Fair Value Hierarchy March 31, 2023 Contingent Revenue Obligation $ 27,719 $ (27,719) $ — $ — $ — December 31, 2021 Payments Loss (Gain) Recognized in Earnings (1) Transfer In (Out) of Level 3 Fair Value Hierarchy March 31, 2022 Contingent Revenue Obligation $ 35,005 $ — $ 9,361 $ — $ 44,366 (1) The loss recognized in earnings resulted primarily from an increase in forecasted future revenue as of March 31, 2022. The following methods and assumptions were used to estimate the fair values of the assets and liabilities in the tables above: Level 2 Fair Value Measurements Trading Securities - Typically includes certificates of deposit, corporate fixed income, and U.S. government securities. The fair values are obtained from a third-party pricing service provider. The fair values provided by the pricing service provider are based on observable market inputs including credit spreads and broker-dealer quotes, among other inputs. The Company classifies the prices obtained from the pricing services within Level 2 of the fair value hierarchy because the underlying inputs are directly observable from active markets. However, the pricing models used entail a certain amount of subjectivity and therefore differing judgments in how the underlying inputs are modeled could result in different estimates of fair value. Level 3 Fair Value Measurements Contingent Revenue Obligation - The fair value of the Contingent Revenue Obligation was estimated using a Black-Scholes pricing model. The inputs included in the Black-Scholes pricing model are the Company’s forecasted future revenue, the stated royalty rate, the remaining periods in the obligation, annual risk-free interest rate based on the U.S. Constant Maturity Treasury Curve and annualized volatility. The annualized volatility was calculated by observing volatilities for comparable companies with adjustments for the Company's size and leverage. As the royalty period ended on December 31, 2022, the fair value of the remaining obligation as of that date represents the actual final calculated payment made during the first quarter of 2023. Refer to Note 9 for additional information.

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2023
Income Tax Disclosure [Abstract]
Income Taxes	Income TaxesFor the three months ended March 31, 2023, the Company recorded income tax expense of $42,411 on income before income taxes of $313,182. The income tax expense differs from the expected statutory amount primarily due to the permanent impact of percentage depletion and foreign-derived intangible income deductions, partially offset by the impact of state income taxes, net of federal impact. For the three months ended March 31, 2022, the Company recorded income tax expense of $39,591 on income before income taxes of $440,482. The income tax expense differs from the expected statutory amount primarily due to the decrease in the valuation allowance and the permanent impact of percentage depletion and foreign-derived intangible income deductions, partially offset by the impact of state income taxes, net of federal impact.

Employee Benefit Plans

Employee Benefit Plans	3 Months Ended
	Mar. 31, 2023
Compensation Related Costs [Abstract]
Employee Benefit Plans	Employee Benefit Plans The components of net periodic benefit cost (credit) other than the service cost component for black lung are included in the line item miscellaneous income, net in the Condensed Consolidated Statements of Operations. Pension The following table details the components of the net periodic benefit cost (credit) for pension obligations: Three Months Ended March 31, 2023 2022 Interest cost $ 5,958 $ 3,984 Expected return on plan assets (5,484) (7,185) Amortization of net actuarial loss 137 484 Net periodic benefit cost (credit) $ 611 $ (2,717) Black Lung The following table details the components of the net periodic benefit cost for black lung obligations: Three Months Ended March 31, 2023 2022 Service cost $ 513 $ 661 Interest cost 1,165 680 Expected return on plan assets (13) (13) Amortization of net actuarial (gain) loss (708) 314 Net periodic benefit cost $ 957 $ 1,642

Related Party Transactions

Related Party Transactions	3 Months Ended
	Mar. 31, 2023
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions There were no material related party transactions for the three months ended March 31, 2023 or 2022.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies (a) General Estimated losses from loss contingencies are accrued by a charge to income when information available indicates that it is probable that an asset has been impaired or a liability has been incurred and the amount of the loss can be reasonably estimated. If a loss contingency is not probable or reasonably estimable, disclosure of the loss contingency is made in the Condensed Consolidated Financial Statements when it is at least reasonably possible that a loss may be incurred and that the loss could be material. (b) Commitments and Contingencies Commitments The Company leases coal mining and other equipment under long-term financing and operating leases with varying terms. In addition, the Company leases mineral interests and surface rights from landowners under various terms and royalty rates. Contingencies Extensive regulation of the impacts of mining on the environment and of maintaining workplace safety has had, and is expected to continue to have, a significant effect on the Company’s costs of production and results of operations. Further regulations, legislation or litigation in these areas may also cause the Company’s sales or profitability to decline by increasing costs or by hindering the Company’s ability to continue mining at existing operations or to permit new operations. During the normal course of business, contract-related matters arise between the Company and its customers. When a loss related to such matters is considered probable and can reasonably be estimated, the Company records a liability. As of March 31, 2023, per terms of the Cumberland Back-to-Back Coal Supply Agreements, the Company is required to purchase and sell 209 tons of coal in the remainder of 2023 totaling $8,045. For the three months ended March 31, 2023 and 2022, the Company purchased and sold 193 and 419 tons, respectively, totaling $7,341 and $16,185, respectively, under the Cumberland Back-to-Back Coal Supply Agreements. As of March 31, 2023, the Cumberland Back-to-Back Coal Supply Agreements are scheduled to be fully performed by the end of the second quarter of 2023. (c) Guarantees and Financial Instruments with Off-Balance Sheet Risk In the normal course of business, the Company is a party to certain guarantees and financial instruments with off-balance sheet risk, such as bank letters of credit, performance or surety bonds, and other guarantees and indemnities related to the obligations of affiliated entities which are not reflected in the Company’s Condensed Consolidated Balance Sheets. However, the underlying liabilities that they secure, such as asset retirement obligations, workers’ compensation liabilities, and royalty obligations, are reflected in the Company’s Condensed Consolidated Balance Sheets. The Company is required to provide financial assurance in order to perform the post-mining reclamation required by its mining permits, pay workers’ compensation claims under workers’ compensation laws in various states, pay federal black lung benefits, and perform certain other obligations. In order to provide the required financial assurance, the Company generally uses surety bonds for post-mining reclamation and workers’ compensation obligations. The Company can also use bank letters of credit to collateralize certain obligations. As of March 31, 2023, the Company had $61,877 letters of credit outstanding under the ABL Agreement. Additionally, as of March 31, 2023, the Company had $50 in letters of credit outstanding under the Credit and Security Agreement dated June 30, 2017, and related amendments, between ANR, Inc. and First Tennessee Bank National Association. As of March 31, 2023, the Company had outstanding surety bonds with a total face amount of $166,543 to secure various obligations and commitments. To secure the Company’s reclamation-related obligations, the Company has $35,253 of collateral in the form of restricted cash and restricted investments supporting these obligations as of March 31, 2023. The Company meets frequently with its surety providers and has discussions with certain providers regarding the extent of and the terms of their participation in the program. These discussions may cause the Company to shift surety bonds between providers or to alter the terms of their participation in our program. To the extent that surety bonds become unavailable or the Company’s surety bond providers require additional collateral, the Company would seek to secure its obligations with letters of credit, cash deposits or other suitable forms of collateral. The Company’s failure to maintain, or inability to acquire, surety bonds or to provide a suitable alternative would have a material adverse effect on its liquidity. These failures could result from a variety of factors, including the lack of availability, higher cost or unfavorable market terms of new surety bonds, and the exercise by third-party surety bond issuers of their right to refuse to renew the surety. Amounts included in restricted cash provide collateral to secure the following obligations: March 31, 2023 December 31, 2022 Workers’ compensation and black lung obligations $ 40,030 $ 15,334 Reclamation-related obligations 701 3,220 Financial payments and other performance obligations 10,200 10,387 Contingent Revenue Obligation escrow — 24,547 Total restricted cash 50,931 53,488 Less current portion — (24,547) Restricted cash, net of current portion $ 50,931 $ 28,941 Amounts included in restricted investments provide collateral to secure the following obligations: March 31, 2023 December 31, 2022 Workers’ compensation and black lung obligations $ 53,771 $ 72,136 Reclamation-related obligations 34,552 31,718 Financial payments and other performance obligations 2,105 1,881 Total restricted investments (1) $ 90,428 $ 105,735 (1) Classified as long-term trading securities as of March 31, 2023 and December 31, 2022. Amounts included in deposits provide collateral to secure the following obligations: March 31, 2023 December 31, 2022 Reclamation-related obligations $ — $ 102 Financial payments and other performance obligations — 391 Other operating agreements (1) 7,472 85,618 Total deposits $ 7,472 $ 86,111 Less current portion (6,602) (84,748) Total deposits, net of current portion (2) 870 1,363 (1) Included $6,602 and $84,748 related to the Company’s dividend payable as of March 31, 2023 and December 31, 2022, respectively. Refer to Note 6 for additional information. (2) Included within Other non-current assets on the Company’s Condensed Consolidated Balance Sheets. DCMWC Reauthorization Process In July 2019, the U.S. Department of Labor (Division of Coal Mine Workers’ Compensation or “DCMWC”) began implementing a new authorization process for all self-insured coal mine operators. As requested by the DCMWC, the Company filed an application and supporting documentation for reauthorization to self-insure certain of its black lung obligations in October 2019. As a result of this application, the DCMWC notified the Company in a letter dated February 21, 2020 that the Company was reauthorized to self-insure certain of its black lung obligations for a period of one-year from February 21, 2020. The DCMWC reauthorization is contingent, however, upon the Company’s providing collateral of $65,700 to secure certain of its black lung obligations. This proposed collateral requirement is an increase from the approximate $2,600 in collateral that the Company currently provides to secure these self-insured black lung obligations. The reauthorization process provided the Company with the right to appeal the security determination in writing within 30 days of the date of the notification, which appeal period the DCMWC agreed to extend to May 22, 2020. The Company exercised this right of appeal in connection with the substantial increase in the amount of required collateral. In February 2021, the U.S. Department of Labor (“DOL”) withdrew its Federal Register notice seeking comments on its bulletin describing its new method of calculating collateral requirements. The Department removed the bulletin from its website in May 2021. On February 10, 2022, a telephone conference was held with DCMWC and DOL decision makers wherein the Company presented facts and arguments in support of its appeal. No ruling has been made on the appeal, but during the call the Company indicated that it would be willing to allocate an additional $10,000 in collateral. If the Company’s appeal is unsuccessful, the Company may be required to provide additional letters of credit to receive the self-insurance reauthorization from the DCMWC or alternatively insure these black lung obligations through a third-party provider that would likely also require the Company to provide additional collateral. In January 2023, the DOL proposed for public comment new regulations which, if adopted, would substantially increase the collateral required to secure self-insured federal black lung obligations. Under the proposed 120% minimum collateral requirement, the Company estimates it could be required to provide approximately $80,000 to $100,000 of collateral to secure certain of its black lung obligations. A significant increase in these collateral obligations would have a materially adverse effect on the Company’s liquidity. (d) Legal Proceedings The Company is party to legal proceedings from time to time. These proceedings, as well as governmental examinations, could involve various business units and a variety of claims including, but not limited to, contract disputes, personal injury claims, property damage claims (including those resulting from blasting, trucking and flooding), environmental and safety issues, securities-related matters and employment matters. While some legal matters may specify the damages claimed by the plaintiffs, many seek an unquantified amount of damages. Even when the amount of damages claimed against the Company or

Segment Information

Segment Information	3 Months Ended
	Mar. 31, 2023
Segment Reporting [Abstract]
Segment Information	Segment Information The Company extracts, processes and markets met and thermal coal from deep and surface mines for sale to steel and coke producers, industrial customers, and electric utilities. The Company conducts mining operations only in the United States with mines in Central Appalachia (“CAPP”). The Company has one reportable segment: Met, which consists of five active mines and two preparation plants in Virginia, sixteen active mines and five preparation plants in West Virginia, as well as expenses associated with certain idled/closed mines. In addition to the one reportable segment, the All Other category includes general corporate overhead and corporate assets and liabilities, the former CAPP - Thermal operations consisting of one active mine and one preparation plant in West Virginia, and the elimination of certain intercompany activity, as well as expenses associated with certain idled/closed mines. Certain immaterial amounts as of and for the three months ended March 31, 2022 in the Condensed Consolidated Financials Statements and notes to the Condensed Consolidated Financials Statements have been recast to reclassify discontinued operations and present the related amounts within continuing operations as part of the All Other category. Reportable segment operating results are regularly reviewed by the Chief Operating Decision Maker (the “CODM”), who is the Chief Executive Officer of the Company. Segment operating results and capital expenditures for the three months ended March 31, 2023 and 2022 were as follows: Three Months Ended March 31, 2023 Met All Other Consolidated Total revenues $ 889,938 $ 21,297 $ 911,235 Depreciation, depletion, and amortization $ 28,879 $ 544 $ 29,423 Amortization of acquired intangibles, net $ 2,197 $ — $ 2,197 Adjusted EBITDA $ 362,008 $ (7,593) $ 354,415 Capital expenditures $ 71,614 $ 2,634 $ 74,248 Three Months Ended March 31, 2022 Met All Other Consolidated Total revenues $ 1,055,689 $ 16,275 $ 1,071,964 Depreciation, depletion, and amortization $ 27,060 $ 975 $ 28,035 Amortization of acquired intangibles, net $ 4,796 $ 952 $ 5,748 Adjusted EBITDA $ 513,301 $ (9,640) $ 503,661 Capital expenditures $ 27,297 $ 849 $ 28,146 The following tables present a reconciliation of net income (loss) to Adjusted EBITDA for the three months ended March 31, 2023 and 2022: Three Months Ended March 31, 2023 Met All Other Consolidated Net income (loss) $ 327,214 $ (56,443) $ 270,771 Interest expense 165 1,555 1,720 Interest income (188) (1,330) (1,518) Income tax expense — 42,411 42,411 Depreciation, depletion and amortization 28,879 544 29,423 Non-cash stock compensation expense 19 3,015 3,034 Accretion on asset retirement obligations 3,722 2,655 6,377 Amortization of acquired intangibles, net 2,197 — 2,197 Adjusted EBITDA $ 362,008 $ (7,593) $ 354,415 Three Months Ended March 31, 2022 Met All Other Consolidated Net income (loss) $ 478,167 $ (77,276) $ 400,891 Interest expense 49 13,034 13,083 Interest income (172) (12) (184) Income tax expense — 39,591 39,591 Depreciation, depletion and amortization 27,060 975 28,035 Non-cash stock compensation expense 3 1,179 1,182 Mark-to-market adjustment - acquisition-related obligations — 9,361 9,361 Accretion on asset retirement obligations 3,398 2,556 5,954 Amortization of acquired intangibles, net 4,796 952 5,748 Adjusted EBITDA $ 513,301 $ (9,640) $ 503,661 No asset information has been disclosed as the CODM does not regularly review asset information by reportable segment. The Company markets produced, processed and purchased coal to customers in the United States and in international markets. Revenue is tracked within the Company’s accounting records based on the product destination. The following tables present additional information on our revenues and top customers: Three Months Ended March 31, 2023 2022 Total coal revenues $ 906,698 $ 1,069,738 Total revenues $ 911,235 $ 1,071,964 Export coal revenues $ 678,131 $ 894,525 Export coal revenues as % of total coal revenues 75 % 84 % Countries with export coal revenue exceeding 10% of total revenues India India Top customer as % of total revenues 17 % 29 % Top 10 customers as % of total revenues 78 % 73 % Number of customers exceeding 10% of total revenues 4 1 As of March 31, 2023 2022 Number of customers exceeding 10% of total trade accounts receivable, net 3 1

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2023
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On May 3, 2023, the Board declared a quarterly cash dividend of $0.50 per share which will be payable on July 5, 2023 for holders of record as of June 15, 2023. The quarterly cash dividend was increased from the previous quarterly cash dividend of $0.44 per share. Refer to Note 6 for information regarding the Company’s dividend program.

Business and Basis of Present_2

Business and Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation Together, the condensed consolidated statements of operations, comprehensive income, balance sheets, cash flows and stockholders’ equity for the Company are referred to as the “Condensed Consolidated Financial Statements.” The Condensed Consolidated Financial Statements are also referenced across periods as “Condensed Consolidated Statements of Operations,” “Condensed Consolidated Statements of Comprehensive Income,” “Condensed Consolidated Balance Sheets,” “Condensed Consolidated Statements of Cash Flows,” and “Condensed Consolidated Statements of Stockholders’ Equity.” The Condensed Consolidated Financial Statements include all wholly-owned subsidiaries’ results of operations for the three months ended March 31, 2023 and 2022. All significant intercompany transactions have been eliminated in consolidation.
Reclassifications	ReclassificationsCertain immaterial amounts for the three months ended March 31, 2022 in the Condensed Consolidated Financials Statements and notes to the Condensed Consolidated Financials Statements have been recast to reclassify discontinued operations and present the related amounts within continuing operations as part of the All Other category.
Recent Accounting Guidance	Recent Accounting Guidance There are no new pronouncements issued but not yet effective expected to have a material impact on the Company’s financial position, results of operations, or liquidity.

Revenue (Tables)

Revenue (Tables)	3 Months Ended
	Mar. 31, 2023
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following tables disaggregate the Company’s coal revenues by product category and by market to depict how the nature, amount, timing, and uncertainty of the Company’s coal revenues and cash flows are affected by economic factors: Three Months Ended March 31, 2023 Met Coal Thermal Coal Total Export coal revenues $ 647,932 $ 30,199 $ 678,131 Domestic coal revenues 210,047 18,520 228,567 Total coal revenues $ 857,979 $ 48,719 $ 906,698 Three Months Ended March 31, 2022 Met Coal Thermal Coal Total Export coal revenues $ 888,006 $ 6,519 $ 894,525 Domestic coal revenues 159,987 15,226 175,213 Total coal revenues $ 1,047,993 $ 21,745 $ 1,069,738
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction	The following table includes estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied as of March 31, 2023: Remainder of 2023 2024 2025 2026 2027 Total Estimated coal revenues $ 110,624 $ 37,250 $ — $ — $ — $ 147,874

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	3 Months Ended
	Mar. 31, 2023
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Loss	The following tables summarize the changes to accumulated other comprehensive loss during the three months ended March 31, 2023 and 2022: Balance January 1, 2023 Other comprehensive income (loss) before reclassifications Amounts reclassified from accumulated other comprehensive loss Balance March 31, 2023 Employee benefit costs $ (12,162) $ — $ (488) $ (12,650) Balance January 1, 2022 Other comprehensive income (loss) before reclassifications Amounts reclassified from accumulated other comprehensive loss Balance March 31, 2022 Employee benefit costs $ (58,503) $ — $ 775 $ (57,728) The following table summarizes the amounts reclassified from accumulated other comprehensive loss and the Condensed Consolidated Statements of Operations line items affected by the reclassification during the three months ended March 31, 2023 and 2022: Details about accumulated other comprehensive loss components Amounts reclassified from accumulated other comprehensive loss Affected line item in the Condensed Consolidated Statements of Operations Three Months Ended March 31, 2023 2022 Employee benefit costs: Amortization of net actuarial (gain) loss (1) $ (627) $ 784 Miscellaneous income, net Settlement (1) — (9) Miscellaneous income, net Total before income tax $ (627) $ 775 Income tax 139 — Income tax expense Total, net of income tax $ (488) $ 775 (1) These accumulated other comprehensive loss components are included in the computation of net periodic benefit costs for certain employee benefit plans. Refer to Note 13.

Net Income Per Share (Tables)

Net Income Per Share (Tables)	3 Months Ended
	Mar. 31, 2023
Earnings Per Share [Abstract]
Schedule of Net Income Per Common Share, Basic and Diluted	The following table presents the net income per common share for the three months ended March 31, 2023 and 2022: Three Months Ended March 31, 2023 2022 Basic Net income 270,771 400,891 Weighted average common shares outstanding - basic 15,266,895 18,574,026 Net income per common share - basic $ 17.74 $ 21.58 Diluted Weighted average common shares outstanding - basic 15,266,895 18,574,026 Diluted effect of warrants 158,304 443,273 Diluted effect of stock options 1,999 7,119 Diluted effect of other stock-based instruments 489,180 516,224 Weighted average common shares outstanding - diluted 15,916,378 19,540,642 Net income per common share - diluted $ 17.01 $ 20.52

Inventories, net (Tables)

Inventories, net (Tables)	3 Months Ended
	Mar. 31, 2023
Inventory Disclosure [Abstract]
Schedule of Inventory	Inventories, net consisted of the following: March 31, 2023 December 31, 2022 Raw coal $ 54,848 $ 57,382 Saleable coal 152,383 91,474 Materials, supplies and other, net 59,447 51,718 Total inventories, net $ 266,678 $ 200,574

Capital Stock (Tables)

Capital Stock (Tables)	3 Months Ended
	Mar. 31, 2023
Equity [Abstract]
Schedule of Dividends Declared	the Board declared the following quarterly cash dividend on the Company’s common stock during the three months ended March 31, 2023: Dividend per share Dividend Paid (1) Declaration Date Holders of Record Date Payable Date $ 0.44 $ 6,602 February 21, 2023 March 15, 2023 April 3, 2023 (1) Excludes dividend equivalents accrued of $223 as of March 31, 2023. As of March 31, 2023, a related $6,602 balance was held on deposit to facilitate the dividend payment on April 3, 2023.

Accrued Expenses and Other Cu_2

Accrued Expenses and Other Current Liabilities (Tables)	3 Months Ended
	Mar. 31, 2023
Payables and Accruals [Abstract]
Schedule of Accrued Expenses and Other Current Liabilities	Accrued expenses and other current liabilities consisted of the following: March 31, 2023 December 31, 2022 Wages and benefits $ 55,739 $ 69,458 Workers’ compensation 11,651 11,651 Black lung 9,664 9,664 Taxes other than income taxes 30,820 24,959 Asset retirement obligations 36,543 36,963 Dividend payable 6,824 86,118 Income taxes payable 14,898 — Freight accrual 12,440 7,181 Other 11,348 19,262 Total accrued expenses and other current liabilities $ 189,927 $ 265,256

Long-Term Debt (Tables)

Long-Term Debt (Tables)	3 Months Ended
	Mar. 31, 2023
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments	Long-term debt consisted of the following: March 31, 2023 December 31, 2022 Notes payable and other $ 6,972 $ 6,179 Financing leases 4,969 4,796 Total long-term debt $ 11,941 $ 10,975 Less current portion (3,562) (3,078) Long-term debt, net of current portion $ 8,379 $ 7,897

Acquisition-Related Obligatio_2

Acquisition-Related Obligations (Tables)	3 Months Ended
	Mar. 31, 2023
Fair Value Disclosures [Abstract]
Schedule of Acquisition-Related Obligations	Acquisition-related obligations consisted of the following: March 31, 2023 December 31, 2022 Contingent Revenue Obligation $ — $ 27,719 Environmental Settlement Obligation 381 535 Total acquisition-related obligations - current $ 381 $ 28,254

Asset Retirement Obligations (T

Asset Retirement Obligations (Tables)	3 Months Ended
	Mar. 31, 2023
Asset Retirement Obligation Disclosure [Abstract]
Summary of Changes in Asset Retirement Obligations	The following table summarizes the changes in asset retirement obligations for the three months ended March 31, 2023: Total asset retirement obligations at December 31, 2022 $ 179,011 Accretion for the period 6,377 Revisions in estimated cash flows (31) Expenditures for the period (3,963) Total asset retirement obligations at March 31, 2023 181,394 Less current portion (1) (36,543) Long-term portion $ 144,851 (1) Included within Accrued expenses and other current liabilities on the Company’s Condensed Consolidated Balance Sheets. Refer to Note 7.

Fair Value of Financial Instr_2

Fair Value of Financial Instruments and Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2023
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The following tables set forth by level, within the fair value hierarchy, the Company’s financial and non-financial assets and liabilities that were accounted for at fair value on a recurring basis as of March 31, 2023 and December 31, 2022. Financial and non-financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. The Company’s assessment of the significance of a particular input to the fair value measurement requires judgment, and may affect the determination of fair value for assets and liabilities and their placement within the fair value hierarchy levels. March 31, 2023 Total Fair Value Quoted Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Trading securities (1) $ 90,428 $ — $ 90,428 $ — (1) Classified as Long-term restricted investments on the Company’s Condensed Consolidated Balance Sheets. December 31, 2022 Total Fair Value Quoted Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Contingent Revenue Obligation $ 27,719 $ — $ — $ 27,719 Trading securities (1) $ 151,787 $ — $ 151,787 $ — (1) Includes $46,052 classified as Short-term investments and $105,735 classified as Long-term restricted investments on the Company’s Condensed Consolidated Balance Sheets. The following tables are reconciliations of the financial and non-financial assets and liabilities that were accounted for at fair value on a recurring basis and that were categorized within Level 3 of the fair value hierarchy: December 31, 2022 Payments Loss (Gain) Recognized in Earnings Transfer In (Out) of Level 3 Fair Value Hierarchy March 31, 2023 Contingent Revenue Obligation $ 27,719 $ (27,719) $ — $ — $ — December 31, 2021 Payments Loss (Gain) Recognized in Earnings (1) Transfer In (Out) of Level 3 Fair Value Hierarchy March 31, 2022 Contingent Revenue Obligation $ 35,005 $ — $ 9,361 $ — $ 44,366 (1) The loss recognized in earnings resulted primarily from an increase in forecasted future revenue as of March 31, 2022.

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	3 Months Ended
	Mar. 31, 2023
Compensation Related Costs [Abstract]
Schedule of Net Periodic Benefit Cost	The following table details the components of the net periodic benefit cost (credit) for pension obligations: Three Months Ended March 31, 2023 2022 Interest cost $ 5,958 $ 3,984 Expected return on plan assets (5,484) (7,185) Amortization of net actuarial loss 137 484 Net periodic benefit cost (credit) $ 611 $ (2,717) The following table details the components of the net periodic benefit cost for black lung obligations: Three Months Ended March 31, 2023 2022 Service cost $ 513 $ 661 Interest cost 1,165 680 Expected return on plan assets (13) (13) Amortization of net actuarial (gain) loss (708) 314 Net periodic benefit cost $ 957 $ 1,642

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Schedule of Restricted Cash Deposits	Amounts included in restricted cash provide collateral to secure the following obligations: March 31, 2023 December 31, 2022 Workers’ compensation and black lung obligations $ 40,030 $ 15,334 Reclamation-related obligations 701 3,220 Financial payments and other performance obligations 10,200 10,387 Contingent Revenue Obligation escrow — 24,547 Total restricted cash 50,931 53,488 Less current portion — (24,547) Restricted cash, net of current portion $ 50,931 $ 28,941
Schedule of Restricted Investments and Deposit Assets	Amounts included in restricted investments provide collateral to secure the following obligations: March 31, 2023 December 31, 2022 Workers’ compensation and black lung obligations $ 53,771 $ 72,136 Reclamation-related obligations 34,552 31,718 Financial payments and other performance obligations 2,105 1,881 Total restricted investments (1) $ 90,428 $ 105,735 (1) Classified as long-term trading securities as of March 31, 2023 and December 31, 2022. Amounts included in deposits provide collateral to secure the following obligations: March 31, 2023 December 31, 2022 Reclamation-related obligations $ — $ 102 Financial payments and other performance obligations — 391 Other operating agreements (1) 7,472 85,618 Total deposits $ 7,472 $ 86,111 Less current portion (6,602) (84,748) Total deposits, net of current portion (2) 870 1,363 (1) Included $6,602 and $84,748 related to the Company’s dividend payable as of March 31, 2023 and December 31, 2022, respectively. Refer to Note 6 for additional information. (2) Included within Other non-current assets on the Company’s Condensed Consolidated Balance Sheets.

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2023
Segment Reporting [Abstract]
Schedule of Segment Operating Results and Capital Expenditures	Segment operating results and capital expenditures for the three months ended March 31, 2023 and 2022 were as follows: Three Months Ended March 31, 2023 Met All Other Consolidated Total revenues $ 889,938 $ 21,297 $ 911,235 Depreciation, depletion, and amortization $ 28,879 $ 544 $ 29,423 Amortization of acquired intangibles, net $ 2,197 $ — $ 2,197 Adjusted EBITDA $ 362,008 $ (7,593) $ 354,415 Capital expenditures $ 71,614 $ 2,634 $ 74,248 Three Months Ended March 31, 2022 Met All Other Consolidated Total revenues $ 1,055,689 $ 16,275 $ 1,071,964 Depreciation, depletion, and amortization $ 27,060 $ 975 $ 28,035 Amortization of acquired intangibles, net $ 4,796 $ 952 $ 5,748 Adjusted EBITDA $ 513,301 $ (9,640) $ 503,661 Capital expenditures $ 27,297 $ 849 $ 28,146 Three Months Ended March 31, 2023 2022 Total coal revenues $ 906,698 $ 1,069,738 Total revenues $ 911,235 $ 1,071,964 Export coal revenues $ 678,131 $ 894,525 Export coal revenues as % of total coal revenues 75 % 84 % Countries with export coal revenue exceeding 10% of total revenues India India Top customer as % of total revenues 17 % 29 % Top 10 customers as % of total revenues 78 % 73 % Number of customers exceeding 10% of total revenues 4 1 As of March 31, 2023 2022 Number of customers exceeding 10% of total trade accounts receivable, net 3 1
Reconciliation of Net Income (Loss) to Adjusted EBITDA	The following tables present a reconciliation of net income (loss) to Adjusted EBITDA for the three months ended March 31, 2023 and 2022: Three Months Ended March 31, 2023 Met All Other Consolidated Net income (loss) $ 327,214 $ (56,443) $ 270,771 Interest expense 165 1,555 1,720 Interest income (188) (1,330) (1,518) Income tax expense — 42,411 42,411 Depreciation, depletion and amortization 28,879 544 29,423 Non-cash stock compensation expense 19 3,015 3,034 Accretion on asset retirement obligations 3,722 2,655 6,377 Amortization of acquired intangibles, net 2,197 — 2,197 Adjusted EBITDA $ 362,008 $ (7,593) $ 354,415 Three Months Ended March 31, 2022 Met All Other Consolidated Net income (loss) $ 478,167 $ (77,276) $ 400,891 Interest expense 49 13,034 13,083 Interest income (172) (12) (184) Income tax expense — 39,591 39,591 Depreciation, depletion and amortization 27,060 975 28,035 Non-cash stock compensation expense 3 1,179 1,182 Mark-to-market adjustment - acquisition-related obligations — 9,361 9,361 Accretion on asset retirement obligations 3,398 2,556 5,954 Amortization of acquired intangibles, net 4,796 952 5,748 Adjusted EBITDA $ 513,301 $ (9,640) $ 503,661

Revenue - Disaggregation of Rev

Revenue - Disaggregation of Revenue by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation of Revenue [Line Items]
Revenues	$ 906,698	$ 1,069,738
Coal
Disaggregation of Revenue [Line Items]
Revenues	906,698	1,069,738
Met Coal
Disaggregation of Revenue [Line Items]
Revenues	857,979	1,047,993
Thermal Coal
Disaggregation of Revenue [Line Items]
Revenues	48,719	21,745
Export | Coal
Disaggregation of Revenue [Line Items]
Revenues	678,131	894,525
Export | Met Coal
Disaggregation of Revenue [Line Items]
Revenues	647,932	888,006
Export | Thermal Coal
Disaggregation of Revenue [Line Items]
Revenues	30,199	6,519
Domestic | Coal
Disaggregation of Revenue [Line Items]
Revenues	228,567	175,213
Domestic | Met Coal
Disaggregation of Revenue [Line Items]
Revenues	210,047	159,987
Domestic | Thermal Coal
Disaggregation of Revenue [Line Items]
Revenues	$ 18,520	$ 15,226

Revenue - Performance Obligatio

Revenue - Performance Obligations (Details) $ in Thousands	Mar. 31, 2023 USD ($)
Disaggregation of Revenue [Line Items]
Estimated coal revenues	$ 147,874
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-04-01
Disaggregation of Revenue [Line Items]
Estimated coal revenues	$ 110,624
Revenue, remaining performance obligation, period	9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Disaggregation of Revenue [Line Items]
Estimated coal revenues	$ 37,250
Revenue, remaining performance obligation, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Disaggregation of Revenue [Line Items]
Estimated coal revenues	$ 0
Revenue, remaining performance obligation, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Disaggregation of Revenue [Line Items]
Estimated coal revenues	$ 0
Revenue, remaining performance obligation, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Disaggregation of Revenue [Line Items]
Estimated coal revenues	$ 0
Revenue, remaining performance obligation, period	1 year

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss - Changes to Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 1,429,755	$ 546,909
Ending balance	1,548,575	929,847
Employee benefit costs
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(12,162)	(58,503)
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive loss	(488)	775
Ending balance	$ (12,650)	$ (57,728)

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Loss - Summary of Amounts Reclassified (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Employee benefit costs:
Miscellaneous income, net	$ 631	$ 1,676
Income (loss) from continuing operations before income taxes	313,182	440,482
Income tax	(42,411)	(39,591)
Net income	270,771	400,891
Amounts reclassified from accumulated other comprehensive loss | Amortization of actuarial (gain) loss
Employee benefit costs:
Miscellaneous income, net	(627)	784
Amounts reclassified from accumulated other comprehensive loss | Settlement
Employee benefit costs:
Miscellaneous income, net	0	(9)
Amounts reclassified from accumulated other comprehensive loss | Employee benefit costs
Employee benefit costs:
Income (loss) from continuing operations before income taxes	(627)	775
Income tax	139	0
Net income	$ (488)	$ 775

Net Income Per Share - Narrativ

Net Income Per Share - Narrative (Details) - shares	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	0	0

Net Income Per Share - Schedule

Net Income Per Share - Schedule of Net (Loss) Income Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Basic
Net income	$ 270,771	$ 400,891
Weighted average common shares outstanding - basic (in shares)	15,266,895	18,574,026
Net income per common share - basic (in dollars per share)	$ 17.74	$ 21.58
Diluted
Weighted average common shares outstanding - basic (in shares)	15,266,895	18,574,026
Diluted effect of warrants (in shares)	158,304	443,273
Weighted average common shares outstanding - diluted (in shares)	15,916,378	19,540,642
Net income per common share - diluted (in dollars per share)	$ 17.01	$ 20.52
Stock Options
Diluted
Dilutive effect of share-based payment awards (in shares)	1,999	7,119
Other Stock-Based Instruments
Diluted
Dilutive effect of share-based payment awards (in shares)	489,180	516,224

Inventories, net (Details)

Inventories, net (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Inventory [Line Items]
Total inventories, net	$ 266,678	$ 200,574
Coal
Inventory [Line Items]
Raw coal	54,848	57,382
Saleable coal	152,383	91,474
Material, supplies and other, net
Inventory [Line Items]
Materials, supplies and other, net	$ 59,447	$ 51,718

Capital Stock - Share Repurchas

Capital Stock - Share Repurchase Program (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Feb. 21, 2023
Equity [Abstract]
Increase in authorized repurchase amount		$ 200,000,000
Authorized share repurchases		$ 1,200,000,000
Number of shares repurchased	4,414,451
Total share repurchase price	$ 654,468,000
Value of shares repurchased	654,335,000
Shares repurchased, fees	133,000
Stock repurchase program exercise tax	$ 1,199,000

Capital Stock - Dividend Declar

Capital Stock - Dividend Declared (Details) - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended
	May 03, 2023	Apr. 03, 2023	Feb. 21, 2023	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Dividends Payable [Line Items]
Dividend per share (in dollars per share)			$ 0.44	$ 0.44
Dividends Paid				$ 85,979	$ 0
Dividend equivalent				223
Deposit for dividend payment				$ 6,602		$ 84,748
Subsequent Event
Dividends Payable [Line Items]
Dividend per share (in dollars per share)	$ 0.50
Dividends Paid		$ 6,602

Capital Stock - Warrants (Detai

Capital Stock - Warrants (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 15, 2023	Dec. 15, 2022	Jul. 26, 2016
Equity [Abstract]
Number of warrants outstanding (in shares)	159,668	744,845			810,811
Exercise price of warrants (in dollars per share)			$ 44.972	$ 45.086
Number of securities called by each warrant (in shares)				1.20
Number of securities called by outstanding warrants (in shares)	191,602	856,572
Shares issued upon exercise of warrants (in shares)	37,404	64,861
Shares withheld upon exercise of warrants (in shares)	8,514	91
Amount reclassified as treasury stock	$ 1,075

Accrued Expenses and Other Cu_3

Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Payables and Accruals [Abstract]
Wages and benefits	$ 55,739	$ 69,458
Workers’ compensation	11,651	11,651
Black lung	9,664	9,664
Taxes other than income taxes	30,820	24,959
Asset retirement obligations	36,543	36,963
Dividend payable	6,824	86,118
Income taxes payable	14,898	0
Freight accrual	12,440	7,181
Other	11,348	19,262
Total accrued expenses and other current liabilities	$ 189,927	$ 265,256

Long-Term Debt - Schedule of Lo

Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Debt Disclosure [Abstract]
Notes payable and other	$ 6,972	$ 6,179
Financing leases	4,969	4,796
Total long-term debt	11,941	10,975
Less current portion	(3,562)	(3,078)
Long-term debt, net of current portion	$ 8,379	$ 7,897

Long-Term Debt - Second Amended

Long-Term Debt - Second Amended and Restated Asset-Based Revolving Credit Agreement (Details) - USD ($)	Mar. 31, 2023	Dec. 31, 2022	Dec. 06, 2021
Debt Instrument [Line Items]
Outstanding borrowings	$ 6,972,000	$ 6,179,000
Line of Credit | New ABL Facility
Debt Instrument [Line Items]
Letters of credit outstanding	61,877,000	61,877,000
Revolving Credit Facility | New ABL Facility
Debt Instrument [Line Items]
Amount of credit facility			$ 155,000,000
Revolving Credit Facility | Line of Credit | New ABL Facility
Debt Instrument [Line Items]
Outstanding borrowings	0	$ 0
Letters of credit outstanding	$ 61,877,000
Letter of Credit | New ABL Facility
Debt Instrument [Line Items]
Amount of credit facility			150,000,000
Amount of credit facility on committed basis			125,000,000
Amount of credit facility on uncommitted basis			$ 25,000,000

Acquisition-Related Obligatio_3

Acquisition-Related Obligations - Summary of Acquisition-Related Obligations (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Fair Value, Option, Quantitative Disclosures [Line Items]
Acquisition-related obligations – current	$ 381	$ 28,254
Contingent Revenue Obligation
Fair Value, Option, Quantitative Disclosures [Line Items]
Acquisition-related obligations – current	0	27,719
Environmental Settlement Obligation
Fair Value, Option, Quantitative Disclosures [Line Items]
Acquisition-related obligations – current	$ 381	$ 535

Asset Retirement Obligations (D

Asset Retirement Obligations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Total asset retirement obligations at December 31, 2022	$ 179,011
Accretion for the period	6,377	$ 5,954
Revisions in estimated cash flows	(31)
Expenditures for the period	(3,963)
Total asset retirement obligations at March 31, 2023	181,394		$ 179,011
Less current portion	(36,543)		(36,963)
Long-term portion	$ 144,851		$ 142,048

Fair Value of Financial Instr_3

Fair Value of Financial Instruments and Fair Value Measurements - Schedule of Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Short-term investments	$ 0	$ 46,052
Long-term restricted investments	90,428	105,735
Fair Value, Measurements, Recurring
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Contingent Revenue Obligation		27,719
Trading securities	90,428	151,787
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1)
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Contingent Revenue Obligation		0
Trading securities	0	0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Contingent Revenue Obligation		0
Trading securities	90,428	151,787
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Contingent Revenue Obligation		27,719
Trading securities	$ 0	$ 0

Fair Value of Financial Instr_4

Fair Value of Financial Instruments and Fair Value Measurements - Level 3 of the Fair Value Hierarchy (Details) - Significant Unobservable Inputs (Level 3) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning balance	$ 27,719	$ 35,005
Payments	(27,719)	0
Loss (Gain) Recognized in Earnings	0	9,361
Transfer In (Out) of Level 3 Fair Value Hierarchy	0	0
Ending balance	$ 0	$ 44,366

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income Tax Disclosure [Abstract]
Income tax expense	$ (42,411)	$ (39,591)
Income before income taxes	$ 313,182	$ 440,482

Employee Benefit Plans (Details

Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Pension
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest cost	$ 5,958	$ 3,984
Expected return on plan assets	(5,484)	(7,185)
Amortization of net actuarial loss	137	484
Net periodic benefit cost (credit)	611	(2,717)
Black Lung
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	513	661
Interest cost	1,165	680
Expected return on plan assets	(13)	(13)
Amortization of net actuarial loss	(708)	314
Net periodic benefit cost (credit)	$ 957	$ 1,642

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) T in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($) T	Mar. 31, 2022 USD ($) T	Jan. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Feb. 10, 2022 USD ($)	Feb. 21, 2020 USD ($)	Feb. 20, 2020 USD ($)
Black Lung
Long-term Purchase Commitment [Line Items]
Collateral for black lung obligations					$ 10,000	$ 65,700	$ 2,600
Black Lung | Minimum
Long-term Purchase Commitment [Line Items]
Collateral for black lung obligations			$ 80,000
Black Lung | Maximum
Long-term Purchase Commitment [Line Items]
Collateral for black lung obligations			$ 100,000
Surety Bond
Long-term Purchase Commitment [Line Items]
Outstanding surety bonds	$ 166,543
Reclamation-Related Obligations | Collateral Pledged
Long-term Purchase Commitment [Line Items]
Restricted cash, restricted investments, and deposits	35,253
Line of Credit | New ABL Facility
Long-term Purchase Commitment [Line Items]
Letters of credit outstanding	61,877			$ 61,877
Revolving Credit Facility | Line of Credit | New ABL Facility
Long-term Purchase Commitment [Line Items]
Letters of credit outstanding	61,877
Revolving Credit Facility | Line of Credit | Credit and Security Agreement
Long-term Purchase Commitment [Line Items]
Letters of credit outstanding	$ 50
Cumberland Back-to-Back Coal Supply Agreements
Long-term Purchase Commitment [Line Items]
Purchase and sale contingency, mass purchases and sales, remainder of year (in tons) | T	209
Purchase and sale contingency, mass purchases and sales, remainder of year	$ 8,045
Purchase and sale contingency, mass purchased and sold (in tons) | T	193	419
Purchase and sale contingency, mass purchased and sold, amount	$ 7,341	$ 16,185

Commitments and Contingencies_2

Commitments and Contingencies - Schedule of Restricted Cash Deposits (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Long-term Purchase Commitment [Line Items]
Total restricted cash	$ 50,931	$ 53,488
Less current portion	0	(24,547)	$ (17,556)
Long-term restricted cash	50,931	28,941	$ 118,476
Workers’ compensation and black lung obligations
Long-term Purchase Commitment [Line Items]
Total restricted cash	40,030	15,334
Reclamation-related obligations
Long-term Purchase Commitment [Line Items]
Total restricted cash	701	3,220
Financial payments and other performance obligations
Long-term Purchase Commitment [Line Items]
Total restricted cash	10,200	10,387
Contingent Revenue Obligation escrow
Long-term Purchase Commitment [Line Items]
Total restricted cash	$ 0	$ 24,547

Commitments and Contingencies_3

Commitments and Contingencies - Schedule of Restricted Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Long-term Purchase Commitment [Line Items]
Total restricted investments	$ 90,428	$ 105,735
Workers’ compensation and black lung obligations
Long-term Purchase Commitment [Line Items]
Total restricted investments	53,771	72,136
Reclamation-related obligations
Long-term Purchase Commitment [Line Items]
Total restricted investments	34,552	31,718
Financial payments and other performance obligations
Long-term Purchase Commitment [Line Items]
Total restricted investments	$ 2,105	$ 1,881

Commitments and Contingencies_4

Commitments and Contingencies - Cash Deposits Held by Third Parties (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Long-term Purchase Commitment [Line Items]
Total deposits	$ 7,472	$ 86,111
Less current portion	(6,602)	(84,748)
Total deposits, net of current portion	870	1,363
Deposit for dividend payment	6,602	84,748
Reclamation-related obligations
Long-term Purchase Commitment [Line Items]
Total deposits	0	102
Financial payments and other performance obligations
Long-term Purchase Commitment [Line Items]
Total deposits	0	391
Other operating agreements
Long-term Purchase Commitment [Line Items]
Total deposits	$ 7,472	$ 85,618

Segment Information - Schedule

Segment Information - Schedule of Operating Results and Capital Expenditures (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($) mine segment plant	Mar. 31, 2022 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	1
Total revenues	$ 911,235	$ 1,071,964
Depreciation, depletion and amortization	29,423	28,035
Amortization of acquired intangibles, net	2,197	5,748
Adjusted EBITDA	354,415	503,661
Capital expenditures	74,248	28,146
Operating Segments | Met
Segment Reporting Information [Line Items]
Total revenues	889,938	1,055,689
Depreciation, depletion and amortization	28,879	27,060
Amortization of acquired intangibles, net	2,197	4,796
Adjusted EBITDA	362,008	513,301
Capital expenditures	$ 71,614	27,297
Operating Segments | Met | Virginia
Segment Reporting Information [Line Items]
Number of active mines | mine	5
Number of preparation plants | plant	2
Operating Segments | Met | West Virginia
Segment Reporting Information [Line Items]
Number of active mines | mine	16
Number of preparation plants | plant	5
All Other
Segment Reporting Information [Line Items]
Total revenues	$ 21,297	16,275
Depreciation, depletion and amortization	544	975
Amortization of acquired intangibles, net	0	952
Adjusted EBITDA	(7,593)	(9,640)
Capital expenditures	$ 2,634	$ 849
All Other | West Virginia
Segment Reporting Information [Line Items]
Number of active mines | mine	1
Number of preparation plants | plant	1

Segment Information - Reconcili

Segment Information - Reconciliation of Net Income (Loss) to Adjusted EBITDA (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net income (loss)	$ 270,771	$ 400,891
Interest expense	1,720	13,083
Interest income	(1,518)	(184)
Income tax expense	42,411	39,591
Depreciation, depletion and amortization	29,423	28,035
Non-cash stock compensation expense	3,034	1,182
Mark-to-market adjustment for acquisition-related obligations	0	9,361
Accretion on asset retirement obligations	6,377	5,954
Amortization of acquired intangibles, net	2,197	5,748
Adjusted EBITDA	354,415	503,661
Operating Segments | Met
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net income (loss)	327,214	478,167
Interest expense	165	49
Interest income	(188)	(172)
Income tax expense	0	0
Depreciation, depletion and amortization	28,879	27,060
Non-cash stock compensation expense	19	3
Mark-to-market adjustment for acquisition-related obligations		0
Accretion on asset retirement obligations	3,722	3,398
Amortization of acquired intangibles, net	2,197	4,796
Adjusted EBITDA	362,008	513,301
All Other
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net income (loss)	(56,443)	(77,276)
Interest expense	1,555	13,034
Interest income	(1,330)	(12)
Income tax expense	42,411	39,591
Depreciation, depletion and amortization	544	975
Non-cash stock compensation expense	3,015	1,179
Mark-to-market adjustment for acquisition-related obligations		9,361
Accretion on asset retirement obligations	2,655	2,556
Amortization of acquired intangibles, net	0	952
Adjusted EBITDA	$ (7,593)	$ (9,640)

Segment Information - Revenue f

Segment Information - Revenue from External Customers (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($) customer	Mar. 31, 2022 USD ($) customer
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 906,698	$ 1,069,738
Total revenues	911,235	1,071,964
Export Coal Revenue
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 678,131	$ 894,525
Revenues | Geographic Concentration Risk | Export Coal Revenue
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk (as a percent)	75%	84%
Revenues | Customer Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of customers exceeding 10% of total trade accounts receivable, net | customer	4	1
Revenues | Customer Concentration Risk | Top Customer
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk (as a percent)	17%	29%
Revenues | Customer Concentration Risk | Top 10 Customers
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk (as a percent)	78%	73%
Accounts Receivable | Customer Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of customers exceeding 10% of total trade accounts receivable, net | customer	3	1

Subsequent Events (Details)

Subsequent Events (Details) - $ / shares			3 Months Ended
	May 03, 2023	Feb. 21, 2023	Mar. 31, 2023
Subsequent Event [Line Items]
Common stock dividends (in dollars per share)		$ 0.44	$ 0.44
Subsequent Event
Subsequent Event [Line Items]
Common stock dividends (in dollars per share)	$ 0.50