Alpha Metallurgical Resources (AMR) 10-Q 5 May 22 2022 Q1 Quarterly report Financial data

Cover Page

Cover Page - shares	3 Months Ended
	Mar. 31, 2022	Apr. 30, 2022
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2022
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	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		18,712,644
Entity Central Index Key	0001704715
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
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, 2022	Mar. 31, 2021
Revenues:
Coal revenues	$ 1,069,738	$ 385,452
Other revenues	2,226	801
Total revenues	1,071,964	386,253
Costs and expenses:
Cost of coal sales (exclusive of items shown separately below)	555,317	347,428
Depreciation, depletion and amortization	28,035	28,438
Accretion on asset retirement obligations	5,954	6,648
Amortization of acquired intangibles, net	5,748	3,869
Asset impairment and restructuring	0	(561)
Selling, general and administrative expenses (exclusive of depreciation, depletion and amortization shown separately above)	15,086	14,982
Total other operating loss (income):
Mark-to-market adjustment for acquisition-related obligations	9,361	3,176
Other income	(628)	(1,225)
Total costs and expenses	618,873	402,755
Income (loss) from operations	453,091	(16,502)
Other (expense) income:
Interest expense	(13,083)	(17,990)
Interest income	184	164
Equity loss in affiliates	(1,361)	(134)
Miscellaneous income, net	1,797	1,766
Total other expense, net	(12,463)	(16,194)
Income (loss) from continuing operations before income taxes	440,628	(32,696)
Income tax (expense) benefit	(39,624)	5
Net income (loss) from continuing operations	401,004	(32,691)
Discontinued operations:
Loss from discontinued operations before income taxes	(146)	(237)
Income tax benefit from discontinued operations	33	0
Loss from discontinued operations	(113)	(237)
Net income (loss)	$ 400,891	$ (32,928)
Basic income (loss) per common share:
Income (loss) from continuing operations (in dollars per share)	$ 21.59	$ (1.78)
Loss from discontinued operations (in dollars per share)	(0.01)	(0.01)
Net income (loss) (in dollars per share)	21.58	(1.79)
Diluted income (loss) per common share:
Income (loss) from continuing operations (in dollars per share)	20.52	(1.78)
Loss from discontinued operations (in dollars per share)	0	(0.01)
Net income (loss) (in dollars per share)	$ 20.52	$ (1.79)
Weighted average shares - basic (in shares)	18,574,026	18,361,444
Weighted average shares - diluted (in shares)	19,540,642	18,361,444

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Other Comprehensive Income [Abstract]
Net income (loss)	$ 400,891	$ (32,928)
Employee benefit plans:
Amortization of and adjustments to employee benefit costs	775	1,484
Income tax expense	0	0
Total other comprehensive income, net of tax	775	1,484
Total comprehensive income (loss)	$ 401,666	$ (31,444)

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 159,455	$ 81,211
Trade accounts receivable, net of allowance for doubtful accounts of $519 and $393 as of March 31, 2022 and December 31, 2021, respectively	636,152	489,241
Inventories, net	161,753	129,382
Prepaid expenses and other current assets	57,144	47,690
Current assets - discontinued operations	69	462
Total current assets	1,014,573	747,986
Property, plant, and equipment, net of accumulated depreciation and amortization of $462,920 and $443,856 as of March 31, 2022 and December 31, 2021, respectively	369,449	362,218
Owned and leased mineral rights, net of accumulated depletion and amortization of $59,894 and $52,444 as of March 31, 2022 and December 31, 2021, respectively	436,852	444,302
Other acquired intangibles, net of accumulated amortization of $39,968 and $34,221 as of March 31, 2022 and December 31, 2021, respectively	68,450	74,197
Long-term restricted cash	118,476	89,426
Other non-current assets	96,673	131,057
Non-current assets - discontinued operations	8,526	8,526
Total assets	2,112,999	1,857,712
Current liabilities:
Current portion of long-term debt	2,434	2,989
Trade accounts payable	109,413	90,090
Acquisition-related obligations – current	21,281	22,405
Accrued expenses and other current liabilities	223,222	174,607
Current liabilities - discontinued operations	4,576	5,838
Total current liabilities	360,926	295,929
Long-term debt	248,936	445,562
Acquisition-related obligations - long-term	28,199	19,000
Workers’ compensation and black lung obligations	204,470	208,193
Pension obligations	155,895	159,930
Asset retirement obligations	133,719	132,013
Deferred income taxes	4,993	317
Other non-current liabilities	22,624	26,176
Non-current liabilities - discontinued operations	23,390	23,683
Total liabilities	1,183,152	1,310,803
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, 21.0 million issued and 18.5 million outstanding at March 31, 2022 and 20.8 million issued and 18.4 million outstanding at December 31, 2021	210	208
Additional paid-in capital	788,281	784,743
Accumulated other comprehensive loss	(57,728)	(58,503)
Treasury stock, at cost: 2.5 million shares at March 31, 2022 and 2.4 million shares at December 31, 2021	(130,068)	(107,800)
Retained earnings (accumulated deficit)	329,152	(71,739)
Total stockholders’ equity	929,847	546,909
Total liabilities and stockholders’ equity	$ 2,112,999	$ 1,857,712

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - Parenthetical - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 519	$ 393
Property, plant and equipment, accumulated amortization, depreciation and amortization	462,920	443,856
Owned and lease mineral rights, accumulated depletion and amortization	59,894	52,444
Other acquired intangibles, accumulated amortization	$ 39,968	$ 34,221
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)	21,000,000	20,800,000
Common stock, shares outstanding (in shares)	18,500,000	18,400,000
Treasury stock, shares at cost (in shares)	2,500,000	2,400,000

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating activities:
Net income (loss)	$ 400,891	$ (32,928)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation, depletion and amortization	28,035	28,438
Amortization of acquired intangibles, net	5,748	3,869
Accretion of acquisition-related obligations discount	109	371
Amortization of debt issuance costs and accretion of debt discount	3,679	3,316
Mark-to-market adjustment for acquisition-related obligations	9,361	3,176
Gain on disposal of assets	(636)	(1,258)
Asset impairment and restructuring	0	(561)
Accretion on asset retirement obligations	5,954	6,648
Employee benefit plans, net	(174)	2,147
Deferred income taxes	4,676	(6)
Stock-based compensation	1,182	2,183
Equity loss in affiliates	1,361	134
Other, net	135	826
Changes in operating assets and liabilities	(124,196)	(35,470)
Net cash provided by (used in) operating activities	336,125	(19,115)
Investing activities:
Capital expenditures	(28,146)	(20,395)
Proceeds on disposal of assets	917	2,652
Purchases of investment securities	(50)	(12,959)
Maturity of investment securities	28,438	1,376
Capital contributions to equity affiliates	(3,468)	(441)
Other, net	(1,243)	18
Net cash used in investing activities	(3,552)	(29,749)
Financing activities:
Principal repayments of long-term debt	(200,461)	(5,223)
Principal repayments of financing lease obligations	(543)	(501)
Common stock repurchases and related expenses	(21,844)	(680)
Proceeds from exercise of stock options	891	0
Proceeds from exercise of warrants	2,257	0
Net cash used in financing activities	(219,700)	(6,404)
Net increase (decrease) in cash and cash equivalents and restricted cash	112,873	(55,268)
Cash and cash equivalents and restricted cash at beginning of period	182,614	244,571
Cash and cash equivalents and restricted cash at end of period	295,487	189,303
Reconciliation of Cash and Cash Equivalents and Restricted Cash
Cash and cash equivalents	159,455	92,236
Short-term restricted cash (included in prepaid expenses and other current assets)	17,556	11,427
Long-term restricted cash	118,476	85,640
Total cash and cash equivalents and restricted cash shown in the Condensed Consolidated Statements of Cash Flows	$ 295,487	$ 189,303

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	Treasury Stock at Cost	(Accumulated Deficit) Retained Earnings
Beginning balance at Dec. 31, 2020	$ 200,102	$ 206	$ 779,424	$ (111,985)	$ (107,014)	$ (360,529)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(32,928)					(32,928)
Other comprehensive income, net	1,484			1,484
Stock-based compensation, issuance of common stock for share vesting, and common stock reissuances	2,183	1	2,182
Common stock repurchases and related expenses	(680)				(680)
Ending balance at Mar. 31, 2021	170,161	207	781,606	(110,501)	(107,694)	(393,457)
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 (loss)	400,891					400,891
Other comprehensive income, 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
Warrant exercises	3,039	1	3,038
Common stock repurchases and related expenses	(23,840)				(23,840)
Ending balance at Mar. 31, 2022	$ 929,847	$ 210	$ 788,281	$ (57,728)	$ (130,068)	$ 329,152

Business and Basis of Presentat

Business and Basis of Presentation	3 Months Ended
	Mar. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business and Basis of Presentation	Business and Basis of Presentation Business Alpha Metallurgical Resources, Inc. (“Alpha” or the “Company”) 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 products for the steel industry. Basis of Presentation Together, the condensed consolidated statements of operations, comprehensive income (loss), 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 (Loss),” “Condensed Consolidated Balance Sheets,” “Condensed Consolidated Statements of Cash Flows,” and “Condensed Consolidated Statements of Stockholders’ Equity.” The Company’s former Northern Appalachia (“NAPP”) operations results of operations and financial position are reported as discontinued operations in the Condensed Consolidated Financial Statements. Refer to Note 2 for further information on discontinued operations. The Condensed Consolidated Financial Statements include all wholly-owned subsidiaries’ results of operations for the three months ended March 31, 2022 and 2021. 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, 2022 are not necessarily indicative of the results to be expected for the year ending December 31, 2022 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, 2021. Reclassifications Certain amounts in the prior year Condensed Consolidated Statements of Cash Flows have been reclassified to conform to the current year presentation. COVID-19 Pandemic In the first quarter of 2020, the COVID-19 virus was declared a pandemic by the World Health Organization. The COVID-19 pandemic has had negative impacts on the Company’s business, results of operations, financial condition and cash flows. The Company experienced an increase in employee absences due to COVID-19. Indirectly, through some of the Company’s third-party vendors, the Company and the Company’s customers have experienced some supply chain disruptions due to the COVID-19 pandemic. The full extent of the impact of the COVID-19 pandemic on the Company’s operational and financial performance will depend on certain developments, including the duration of the virus, its impact on the Company’s customers and suppliers, and the range of governmental and community reactions to the pandemic, which cannot be fully predicted. Health and safety are core values of the Company and are the foundation for how the Company manages every aspect of its business. The Company continues to monitor developments closely and adjust as necessary, including with respect to the Company’s implemented policies, procedures, and prevention measures to protect the safety and health of its employees. Recently Adopted Accounting Guidance Financial Instruments: In March 2022, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) 2022-02, Financial Instruments - Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures (“ASU 2022-02”). This update eliminates the troubled debt restructuring model for creditors that have adopted Topic 326. All loan modifications will now be accounted for under general loan modification guidance and, on a prospective basis, entities will be subject to new disclosure requirements covering modifications of receivables to borrowers experiencing financial difficulty. In addition, entities will be required to prospectively disclose current-period gross write-off information by year of origination. The amendments are effective for fiscal years beginning after December 15, 2022, with early application permitted. The Company adopted ASU 2022-02 during the first quarter of 2022. The adoption of this ASU did not have a material impact on the Company’s Condensed Consolidated Financial Statements and related disclosures.

Discontinued Operations

Discontinued Operations	3 Months Ended
	Mar. 31, 2022
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	Discontinued Operations Discontinued operations consist of activity related to the Company’s former NAPP operations. Major Financial Statement Components of Discontinued Operations The loss from discontinued operations before income taxes for the three months ended March 31, 2022 and 2021 was $146 and $237, respectively. Refer to the Condensed Consolidated Statements of Operations and Note 5 for loss per share information related to discontinued operations. The major components of assets and liabilities that are classified as discontinued operations in the Condensed Consolidated Balance Sheets are as follows: March 31, 2022 December 31, 2021 Assets: Prepaid expenses and other current assets $ 69 $ 462 Other non-current assets (1) $ 8,526 $ 8,526 Liabilities: Trade accounts payable, accrued expenses and other current liabilities $ 4,576 $ 5,838 Workers’ compensation and black lung obligations, non-current $ 23,390 $ 23,683 (1) Comprised of workers’ compensation insurance receivable and long-term restricted investments collateralizing workers’ compensation obligations.

Revenue

Revenue	3 Months Ended
	Mar. 31, 2022
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, 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 Three Months Ended March 31, 2021 Met Coal Thermal Coal Total Export coal revenues $ 242,752 $ 1,031 $ 243,783 Domestic coal revenues 100,242 41,427 141,669 Total coal revenues $ 342,994 $ 42,458 $ 385,452 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, 2022: Remainder of 2022 2023 2024 2025 2026 Total Estimated coal revenues $ 41,980 $ 32,919 $ 37,250 $ — $ — $ 112,149

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	3 Months Ended
	Mar. 31, 2022
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, 2022 and 2021: 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) Balance January 1, 2021 Other comprehensive income (loss) before reclassifications Amounts reclassified from accumulated other comprehensive loss Balance March 31, 2021 Employee benefit costs $ (111,985) $ — $ 1,484 $ (110,501) 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, 2022 and 2021: 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, 2022 2021 Employee benefit costs: Amortization of net actuarial loss (1) $ 784 $ 1,484 Miscellaneous income, net Settlement (1) (9) — Miscellaneous income, net Total before income tax $ 775 $ 1,484 Income tax — — Income tax (expense) benefit Total, net of income tax $ 775 $ 1,484 (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 (Loss) Per Share

Net Income (Loss) Per Share	3 Months Ended
	Mar. 31, 2022
Earnings Per Share [Abstract]
Net Income (Loss) Per Share	Net Income (Loss) Per Share The number of shares used to calculate basic net income (loss) 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 (loss) per common share is based on the number of common shares used to calculate basic net income (loss) 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 Series A warrants. The dilutive effect of outstanding stock-based instruments is determined by application of the treasury stock method. The warrants become dilutive for diluted net income (loss) per common share calculations when the market price of the Company’s common stock exceeds the exercise price. As discussed below, dilutive securities are not included in the computation of diluted net loss per common share for the three months ended March 31, 2021 as the impact would be anti-dilutive. For the three months ended March 31, 2022 and 2021, 0 and 954,248 warrants, stock options, and other stock-based instruments, respectively, were excluded from the computation of dilutive net income (loss) 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. Anti-dilution also occurs in periods of a net loss, and the dilutive impact of all share-based compensation awards are excluded. For the three months ended March 31, 2021 the weighted average share impact of stock options and other stock-based instruments that were excluded from the calculation of diluted shares due to the Company incurring a net loss for the period was 323,236. The following table presents the net income (loss) per common share for the three months ended March 31, 2022 and 2021: Three Months Ended March 31, 2022 2021 Net income (loss) Income (loss) from continuing operations $ 401,004 $ (32,691) Loss from discontinued operations (113) (237) Net income (loss) $ 400,891 $ (32,928) Basic Weighted average common shares outstanding - basic 18,574,026 18,361,444 Basic income (loss) per common share: Income (loss) from continuing operations $ 21.59 $ (1.78) Loss from discontinued operations (0.01) (0.01) Net income (loss) $ 21.58 $ (1.79) Diluted Weighted average common shares outstanding - basic 18,574,026 18,361,444 Diluted effect of warrants 443,273 — Diluted effect of stock options 7,119 — Diluted effect of other stock-based instruments 516,224 — Weighted average common shares outstanding - diluted 19,540,642 18,361,444 Diluted income (loss) per common share: Income (loss) from continuing operations $ 20.52 $ (1.78) Loss from discontinued operations — (0.01) Net income (loss) $ 20.52 $ (1.79)

Inventories, net

Inventories, net	3 Months Ended
	Mar. 31, 2022
Inventory Disclosure [Abstract]
Inventories, net	Inventories, net Inventories, net consisted of the following: March 31, 2022 December 31, 2021 Raw coal $ 29,637 $ 20,347 Saleable coal 99,040 81,240 Materials, supplies and other, net 33,076 27,795 Total inventories, net $ 161,753 $ 129,382

Capital Stock

Capital Stock	3 Months Ended
	Mar. 31, 2022
Equity [Abstract]
Capital Stock	Capital Stock Share Repurchase Program On March 4, 2022, the Company’s board of directors adopted a share repurchase program that permits the Company to repurchase up to an aggregate amount of $150,000 of the Company's common stock. Share repurchases may be made from time to time through open market transactions, block trades, tender offers, or otherwise, and has no expiration date. The share repurchase program does not obligate the Company to acquire any particular amount of common stock or to acquire shares on any particular timetable, and the program may be suspended at any time at the Company’s discretion. Repurchases under the program are subject to market and business conditions, levels of available liquidity, the Company’s cash needs, restrictions under agreements or obligations, legal or regulatory requirements or restrictions and other relevant factors. As of March 31, 2022, the Company had repurchased an aggregate of 133,501 shares under the plan for an aggregate purchase price of approximately $16,547 (comprised of $16,543 of share repurchases and $4 of related fees). Refer to Note 17 for subsequent event disclosures related to the Company’s share repurchase 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 July 26, 2023, and no fractional shares shall be issued upon warrant exercises. As of March 31, 2022 and March 31, 2021, the exercise price was $46.911 per share and the warrant share number was equal to 1.15. As of March 31, 2022, 744,845 warrants remained 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. As of March 31, 2021, 801,370 warrants remained outstanding, with a total of 921,576 shares underlying the un-exercised warrants. For the three months ended March 31, 2021, there were no warrants exercises. Dividend Program Refer to Note 17 for subsequent event disclosures related to the Company’s dividend program announcement.

Long-Term Debt

Long-Term Debt	3 Months Ended
	Mar. 31, 2022
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt Long-term debt consisted of the following: March 31, 2022 December 31, 2021 Term Loan Credit Facility - due June 2024 $ 249,435 $ 449,435 Other (1) 5,029 5,311 Debt discount and issuance costs (3,094) (6,195) Total long-term debt $ 251,370 $ 448,551 Less current portion (2,434) (2,989) Long-term debt, net of current portion $ 248,936 $ 445,562 (1) Includes financing leases. Term Loan Credit Facility - due June 2024 As of March 31, 2022, the borrowings made under the senior secured term loan facility under the Company’s Credit Agreement with a maturity date of June 14, 2024 (the “Term Loan Credit Facility”) were comprised of Eurocurrency Rate Loans (as defined therein) with an interest rate of 10.00%, calculated as the Eurocurrency rate during the period plus an applicable rate of 8.00%. As of March 31, 2022 and December 31, 2021, the carrying value of the Term Loan Credit Facility was $246,341 and $443,241, respectively, all of which was classified as long-term within the Condensed Consolidated Balance Sheets. During the first quarter of 2022, the Company made a voluntary prepayment of $200,000 of outstanding principal borrowings under the Term Loan Credit facility. As a result of the prepayments in the prior year and current period, no further amortization payments under the Term Loan Credit Facility are required prior to maturity. Additionally, refer to Note 17 for related subsequent event disclosures. All obligations under the Term Loan Credit Facility are guaranteed by substantially all of Alpha’s direct and indirect subsidiaries. Certain obligations under the Term Loan Facility are secured by a senior lien, subject to certain exceptions (including the ABL Priority Collateral described below), by substantially all of Alpha’s assets and the assets of Alpha’s subsidiary guarantors (“Term Loan Priority Collateral”), in each case subject to exceptions. The obligations under the Term Loan Credit Facility are also secured by a junior lien, again subject to certain exceptions, against the ABL Priority Collateral. The Term Loan Facility contains negative and affirmative covenants including certain financial covenants that are more flexible than the covenants in the Second Amended and Restated Credit Agreement dated December 6, 2021. The Company was in compliance with all covenants under this agreement as of March 31, 2022. Second Amended and Restated Asset-Based Revolving Credit Agreement The Second Amended and Restated Asset-Based Revolving Credit Agreement (“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 any borrowings having a maturity date of December 6, 2024. As of March 31, 2022 and December 31, 2021, there were no outstanding borrowings under the ABL Facility. As of March 31, 2022 and December 31, 2021, the Company had $121,037 letters of credit outstanding under the ABL Facility. The ABL Agreement provides that a specified percentage of billed and unbilled receivables and raw and clean inventory meeting certain criteria are eligible to be counted for purposes of collateralizing the amount of financing available, subject to certain terms and conditions. Availability under the ABL Facility is calculated on a monthly basis and fluctuates based on qualifying amounts of coal inventory and trade accounts receivable (the “Borrowing Base”) and the facility's covenant limitations related to the Fixed Charge Coverage Ratio (as defined in therein). In accordance with terms of the ABL Facility, the Company may be required to collateralize the ABL Facility to the extent outstanding borrowings and letters of credit under the ABL Facility exceed the Borrowing Base after considering covenant limitations. The ABL Facility is guaranteed by substantially all of Alpha’s direct and indirect subsidiaries (together with Alpha, the “Loan Parties”) and secured by all or substantially all assets of the Loan Parties, including equity in Alpha’s direct domestic subsidiaries, as collateral for the obligations under the ABL Facility. The ABL Facility has a first lien on ABL priority collateral and a second lien on Term Loan Priority Collateral. 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, 2022.

Acquisition-Related Obligations

Acquisition-Related Obligations	3 Months Ended
	Mar. 31, 2022
Fair Value Disclosures [Abstract]
Acquisition-Related Obligations	Acquisition-Related Obligations Acquisition-related obligations consisted of the following: March 31, 2022 December 31, 2021 Contingent Revenue Obligation $ 44,366 $ 35,005 Environmental Settlement Obligations 5,238 6,633 Discount (124) (233) Total acquisition-related obligations $ 49,480 $ 41,405 Less current portion (21,281) (22,405) Acquisition-related obligations, net of current portion $ 28,199 $ 19,000 Contingent Revenue Obligation As of March 31, 2022 and December 31, 2021, the carrying value of the Contingent Revenue Obligation was $44,366 and $35,005, with $16,166 and $16,005 classified as current, respectively, classified as an acquisition-related obligation in the

Asset Retirement Obligations

Asset Retirement Obligations	3 Months Ended
	Mar. 31, 2022
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, 2022: Total asset retirement obligations at December 31, 2021 $ 164,172 Accretion for the period 5,954 Revisions in estimated cash flows (337) Expenditures for the period (3,695) Total asset retirement obligations at March 31, 2022 166,094 Less current portion (1) (32,375) Long-term portion $ 133,719 (1) Included within Accrued expenses and other current liabilities on the Company’s Condensed Consolidated Balance Sheets.

Fair Value of Financial Instrum

Fair Value of Financial Instruments and Fair Value Measurements	3 Months Ended
	Mar. 31, 2022
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, short-term and long-term restricted cash, short-term and long-term deposits, trade accounts payable, and accrued expenses and other current liabilities approximate fair value as of March 31, 2022 and December 31, 2021 due to the short maturity of these instruments. The following tables set forth by level, within the fair value hierarchy, the Company’s long-term debt at fair value as of March 31, 2022 and December 31, 2021: March 31, 2022 Carrying Amount (1) Total Fair Value Quoted Prices in Active Markets Significant Other Observable Inputs Significant Unobservable Inputs Term Loan Credit Facility - due June 2024 $ 246,341 $ 249,955 $ — $ 249,955 $ — Total long-term debt $ 246,341 $ 249,955 $ — $ 249,955 $ — December 31, 2021 Carrying Amount (1) Total Fair Value Quoted Prices in Active Markets Significant Other Observable Inputs Significant Unobservable Inputs Term Loan Credit Facility - due June 2024 $ 443,241 $ 447,561 $ — $ 447,561 $ — Total long-term debt $ 443,241 $ 447,561 $ — $ 447,561 $ — (1) Net of debt discounts and debt issuance costs. The following tables set forth by level, within the fair value hierarchy, the Company’s acquisition-related obligations at fair value as of March 31, 2022 and December 31, 2021: March 31, 2022 Carrying Amount (1) Total Fair Value Quoted Prices in Active Markets Significant Other Observable Inputs Significant Unobservable Inputs Environmental Settlement Obligations $ 5,114 $ 5,046 $ — $ — $ 5,046 Total acquisition-related obligations $ 5,114 $ 5,046 $ — $ — $ 5,046 December 31, 2021 Carrying Amount (1) Total Fair Value Quoted Prices in Active Markets Significant Other Observable Inputs Significant Unobservable Inputs Environmental Settlement Obligations $ 6,400 $ 6,270 $ — $ — $ 6,270 Total acquisition-related obligations $ 6,400 $ 6,270 $ — $ — $ 6,270 (1) Net of discounts. The following table sets 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, 2022 and December 31, 2021. 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, 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 $ 44,366 $ — $ — $ 44,366 Trading securities $ 50 $ — $ 50 $ — December 31, 2021 Total Fair Value Quoted Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Contingent Revenue Obligation $ 35,005 $ — $ — $ 35,005 Trading securities $ 28,443 $ 27,075 $ 1,368 $ — The following tables present a reconciliation 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, 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. December 31, 2020 Payments Loss (Gain) Recognized in Earnings (1) Transfer In (Out) of Level 3 Fair Value Hierarchy March 31, 2021 Contingent Revenue Obligation $ 28,967 $ — $ 3,176 $ — $ 32,143 (1) The loss recognized in earnings resulted primarily from a decrease in the annual risk-free interest rate as of March 31, 2021. The following methods and assumptions were used to estimate the fair values of the assets and liabilities in the tables above: Level 1 Fair Value Measurements Trading Securities - Typically includes money market funds and other cash equivalents. The fair value is based on observable market data. Level 2 Fair Value Measurements Term Loan Credit Facility - due June 2024 - The fair value is based on the average between bid and ask prices provided by a third-party. As the fair value is based on observable market inputs and due to limited trading volume in the Term Loan Credit Facility, the Company has classified the fair value within Level 2 of the fair value hierarchy. Trading Securities - Typically includes certificates of deposit, mutual funds, corporate debt securities and U.S. treasury and agency securities. The fair values of the Company’s trading securities 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 Environmental Settlement Obligations - Observable transactions are not available to aid in determining the fair value of these items. Therefore, the fair value was derived by using the expected present value approach in which estimated cash flows are discounted using a risk-free interest rate adjusted for credit risk (discount rates of approximately 12% and 13% as of March 31, 2022 and December 31, 2021, respectively). Contingent Revenue Obligation - The fair value of the contingent revenue obligation was estimated using a Black-Scholes pricing model and is marked to market at each reporting period with changes in value reflected in earnings. 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. The range of significant unobservable inputs used to value the Contingent Revenue Obligation as of March 31, 2022 and December 31, 2021, are set forth in the following table: March 31, 2022 December 31, 2021 Forecasted future revenue $1.5 - $3.1 billion $1.5 - $2.0 billion Stated royalty rate 1.0% - 1.5% 1.0% - 1.5% Annualized volatility 20.7% - 39.3% (37.0%) 18.4% - 39.3% (29.9%)

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2022
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes For the three months ended March 31, 2022, the Company recorded income tax expense of $39,624 on income from continuing operations before income taxes of $440,628. 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. For the three months ended March 31, 2021, the Company recorded income tax benefit of $5 on a loss from continuing operations before income taxes of $32,696. The income tax benefit differs from the expected statutory amount primarily due to the increase in the valuation allowance, partially offset by the permanent impact of percentage depletion deductions and the impact of state income taxes, net of federal tax impact. As a result of generating income before income taxes during the three months ended March 31, 2022, the Company recorded a decrease of $23,453 to its deferred tax asset valuation allowance recorded as of December 31, 2021. The decrease in the valuation allowance results in part from a decrease in deferred tax assets since the prior reporting date of December 31, 2021. The Company currently is relying primarily on the reversal of taxable temporary differences, along with consideration of taxable income via carryback to prior years and tax planning strategies, to support the realization of deferred tax assets. For each reporting period, the Company updates its assessment regarding the realizability of its deferred tax assets, including scheduling the reversal of its deferred tax assets and liabilities, to determine the amount of valuation allowance needed. Scheduling the reversal of deferred tax asset and liability balances requires judgment and estimation. The Company believes the deferred tax liabilities relied upon as future taxable income in its assessment will reverse in the same period and jurisdiction and are of the same character as the temporary differences giving rise to the deferred tax assets that will be realized. The valuation allowance recorded represents the portion of deferred tax assets for which the Company is unable to support realization through the methods described above. As of March 31, 2022, the Company has recorded a current federal and state income taxes payable of $38,249, classified as Accrued expenses and other current liabilities in the Condensed Consolidated Balance Sheets.

Employee Benefit Plans

Employee Benefit Plans	3 Months Ended
	Mar. 31, 2022
Compensation Related Costs [Abstract]
Employee Benefit Plans	Employee Benefit Plans The components of net periodic benefit (credit) cost 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 credit for pension obligations: Three Months Ended March 31, 2022 2021 Interest cost $ 3,984 $ 3,422 Expected return on plan assets (7,185) (7,247) Amortization of net actuarial loss 484 875 Net periodic benefit credit $ (2,717) $ (2,950) Black Lung The following table details the components of the net periodic benefit cost for black lung obligations: Three Months Ended March 31, 2022 2021 Service cost $ 654 $ 739 Interest cost 665 607 Expected return on plan assets (13) (14) Amortization of net actuarial loss 209 522 Net periodic benefit cost $ 1,515 $ 1,854

Related Party Transactions

Related Party Transactions	3 Months Ended
	Mar. 31, 2022
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions There were no material related party transactions for the three months ended March 31, 2022 or 2021.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2022
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. Coal royalty expense was $57,343 and $18,758 for the three months ended March 31, 2022 and 2021, respectively. Other Commitments As of March 31, 2022, the Company has obligations under certain coal purchase agreements that contain minimum quantities to be purchased in the remainder of 2022 totaling an estimated $71,226. 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, 2022, per terms of the Cumberland Back-to-Back Coal Supply Agreements, the Company is required to purchase and sell 1,600 tons of coal in the remainder of 2022 totaling $61,853. For the three months ended March 31, 2022 and 2021, the Company purchased and sold 419 and 700 tons, respectively, totaling $16,185 and $27,066, respectively, under the Cumberland Back-to-Back Coal Supply Agreements. As of March 31, 2022, the Cumberland Back-to-Back Coal Supply Agreements are scheduled to be fully performed by December 31, 2022. (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, 2022, the Company had $121,037 letters of credit outstanding under the Second Amended and Restated Asset-Based Revolving Credit Agreement. Additionally, as of March 31, 2022, 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, 2022, the Company had outstanding surety bonds with a total face amount of $174,198 to secure various obligations and commitments. To secure the Company’s reclamation-related obligations, the Company has $36,774 of collateral in the form of restricted cash and deposits and $15,548 of letters of credit outstanding supporting these obligations as of March 31, 2022. 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 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 which have been written on the Company’s behalf: March 31, 2022 December 31, 2021 Workers’ compensation and black lung obligations $ 72,252 $ 70,637 Reclamation-related obligations 36,665 10,449 Financial payments and other performance obligations 9,559 8,340 Contingent Revenue Obligation escrow 17,556 11,977 Total restricted cash 136,032 101,403 Less current portion (1) (17,556) (11,977) Restricted cash, net of current portion $ 118,476 $ 89,426 (1) Included within Prepaid expenses and other current assets on the Company’s Condensed Consolidated Balance Sheets. Amounts included in restricted investments provide collateral to secure the following obligations which have been written on the Company’s behalf: March 31, 2022 December 31, 2021 Workers’ compensation obligations $ 50 $ 210 Reclamation-related obligations — 26,225 Financial payments and other performance obligations — 2,008 Total restricted investments (1), (2) $ 50 $ 28,443 (1) Included within Other non-current assets on the Company’s Condensed Consolidated Balance Sheets. (2) Classified as trading securities as of March 31, 2022 and December 31, 2021. Amounts included in deposits provide collateral to secure the following obligations which have been written on the Company’s behalf: March 31, 2022 December 31, 2021 Reclamation-related obligations $ 109 $ 118 Financial payments and other performance obligations 411 403 Other operating agreements 866 873 Total deposits (1) $ 1,386 $ 1,394 (1) Included within Prepaid expenses and other current assets and 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. Either of these outcomes could potentially reduce 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 its subsidiaries is stated, (i) the claimed amount may be exaggerated or unsupported; (ii) the claim may be based on a novel legal theory or involve a large number of parties; (iii) there may be uncertainty as to the likelihood of a class being certified or the ultimate size of the class; (iv) there may be uncertainty as to the outcome of pending appeals or motions; and/or (v) there may be significant factual issues to be resolved. As a result, if such legal matters arise in the future, the Company may be unable to estimate a range of possible loss for matters that have not yet progressed sufficiently through discovery and development of important factual information and legal issues. The Company records accruals based on an estimate of the ultimate outcome of these matters, but these estimates can be difficult to determine and involve significant judgment.

Segment Information

Segment Information	3 Months Ended
	Mar. 31, 2022
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, fourteen 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. Reportable segment operating results are regularly reviewed by the Chief Operating Decision Maker (“CODM”), who is the Chief Executive Officer of the Company. Segment operating results and capital expenditures for the three months ended March 31, 2022 and 2021 were as follows: 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 $ (9,494) $ 503,807 Capital expenditures $ 27,297 $ 849 $ 28,146 Three Months Ended March 31, 2021 Met All Other Consolidated Total revenues $ 359,878 $ 26,375 $ 386,253 Depreciation, depletion, and amortization $ 26,536 $ 1,902 $ 28,438 Amortization of acquired intangibles, net $ 4,051 $ (182) $ 3,869 Adjusted EBITDA $ 32,582 $ (3,699) $ 28,883 Capital expenditures $ 20,323 $ 72 $ 20,395 The following tables present a reconciliation of net income (loss) to Adjusted EBITDA for the three months ended March 31, 2022 and 2021: Three Months Ended March 31, 2022 Met All Other Consolidated Net income (loss) from continuing operations $ 478,167 $ (77,163) $ 401,004 Interest expense 49 13,034 13,083 Interest income (172) (12) (184) Income tax expense — 39,624 39,624 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 $ (9,494) $ 503,807 Three Months Ended March 31, 2021 Met All Other Consolidated Net loss from continuing operations $ (1,438) $ (31,253) $ (32,691) Interest expense 43 17,947 17,990 Interest income (5) (159) (164) Income tax benefit — (5) (5) Depreciation, depletion and amortization 26,536 1,902 28,438 Non-cash stock compensation expense 10 2,173 2,183 Mark-to-market adjustment - acquisition-related obligations — 3,176 3,176 Accretion on asset retirement obligations 3,385 3,263 6,648 Asset impairment and restructuring — (561) (561) Amortization of acquired intangibles, net 4,051 (182) 3,869 Adjusted EBITDA $ 32,582 $ (3,699) $ 28,883 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 table presents additional information on our revenues and top customers: Three Months Ended March 31, 2022 2021 Total coal revenues $ 1,069,738 $ 385,452 Export coal revenues $ 894,525 $ 243,783 Export coal revenues as % of total coal revenues 84 % 63 % Countries with export coal revenue exceeding 10% of total revenue India India, Brazil Top customer as % of total revenue 29 % 13 % Top 10 customers as % of total revenue 73 % 63 % Number of customers exceeding 10% of total revenue 1 1 Number of customers exceeding 10% of total trade accounts receivable, net 1 3

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2022
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events During the second quarter of 2022, the Company made a voluntary prepayment of $150,000 of outstanding principal borrowings under the Term Loan Credit facility. Refer to Note 8 for further information related to long-term debt. On May 3, 2022, the Company’s board of directors amended the share repurchase program adopted on March 4, 2022 to increase the aggregate amount the Company is permitted to repurchase from an aggregate amount of up to $150,000 to an aggregate amount of up to $600,000 of the Company's common stock. Refer to Note 7 for information regarding the Company’s share repurchase program. Additionally on May 3, 2022, the Company‘s board of directors adopted a dividend policy. Pursuant to this policy, the board intends to pay aggregate cash dividends of $1.50 per share of common stock per year, with $0.375 per share paid each quarter. The board has declared that the first quarterly dividend payment will become payable on July 1, 2022 for holders of record as of June 15, 2022. Future dividend payments will be targeted to be paid in the first month of each calendar quarter. Any decision to pay future cash dividends will, however, be made by the board and depend on Alpha’s future earnings and financial condition and other relevant factors.

Business and Basis of Present_2

Business and Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation Together, the condensed consolidated statements of operations, comprehensive income (loss), 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 (Loss),” “Condensed Consolidated Balance Sheets,” “Condensed Consolidated Statements of Cash Flows,” and “Condensed Consolidated Statements of Stockholders’ Equity.” The Company’s former Northern Appalachia (“NAPP”) operations results of operations and financial position are reported as discontinued operations in the Condensed Consolidated Financial Statements. Refer to Note 2 for further information on discontinued operations. The Condensed Consolidated Financial Statements include all wholly-owned subsidiaries’ results of operations for the three months ended March 31, 2022 and 2021. All significant intercompany transactions have been eliminated in consolidation.
Reclassifications	ReclassificationsCertain amounts in the prior year Condensed Consolidated Statements of Cash Flows have been reclassified to conform to the current year presentation.
Recent Adopted Accounting Guidance	Recently Adopted Accounting Guidance Financial Instruments: In March 2022, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) 2022-02, Financial Instruments - Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures (“ASU 2022-02”). This update eliminates the troubled debt restructuring model for creditors that have adopted Topic 326. All loan modifications will now be accounted for under general loan modification guidance and, on a prospective basis, entities will be subject to new disclosure requirements covering modifications of receivables to borrowers experiencing financial difficulty. In addition, entities will be required to prospectively disclose current-period gross write-off information by year of origination. The amendments are effective for fiscal years beginning after December 15, 2022, with early application permitted. The Company adopted ASU 2022-02 during the first quarter of 2022. The adoption of this ASU did not have a material impact on the Company’s Condensed Consolidated Financial Statements and related disclosures.

Discontinued Operations (Tables

Discontinued Operations (Tables)	3 Months Ended
	Mar. 31, 2022
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	The major components of assets and liabilities that are classified as discontinued operations in the Condensed Consolidated Balance Sheets are as follows: March 31, 2022 December 31, 2021 Assets: Prepaid expenses and other current assets $ 69 $ 462 Other non-current assets (1) $ 8,526 $ 8,526 Liabilities: Trade accounts payable, accrued expenses and other current liabilities $ 4,576 $ 5,838 Workers’ compensation and black lung obligations, non-current $ 23,390 $ 23,683 (1) Comprised of workers’ compensation insurance receivable and long-term restricted investments collateralizing workers’ compensation obligations.

Revenue (Tables)

Revenue (Tables)	3 Months Ended
	Mar. 31, 2022
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, 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 Three Months Ended March 31, 2021 Met Coal Thermal Coal Total Export coal revenues $ 242,752 $ 1,031 $ 243,783 Domestic coal revenues 100,242 41,427 141,669 Total coal revenues $ 342,994 $ 42,458 $ 385,452
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, 2022: Remainder of 2022 2023 2024 2025 2026 Total Estimated coal revenues $ 41,980 $ 32,919 $ 37,250 $ — $ — $ 112,149

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	3 Months Ended
	Mar. 31, 2022
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	The following tables summarize the changes to accumulated other comprehensive loss during the three months ended March 31, 2022 and 2021: 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) Balance January 1, 2021 Other comprehensive income (loss) before reclassifications Amounts reclassified from accumulated other comprehensive loss Balance March 31, 2021 Employee benefit costs $ (111,985) $ — $ 1,484 $ (110,501) 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, 2022 and 2021: 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, 2022 2021 Employee benefit costs: Amortization of net actuarial loss (1) $ 784 $ 1,484 Miscellaneous income, net Settlement (1) (9) — Miscellaneous income, net Total before income tax $ 775 $ 1,484 Income tax — — Income tax (expense) benefit Total, net of income tax $ 775 $ 1,484 (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 (Loss) Per Share (Ta

Net Income (Loss) Per Share (Tables)	3 Months Ended
	Mar. 31, 2022
Earnings Per Share [Abstract]
Schedule of Net (Loss) Income Per Common Share, Basic and Diluted	The following table presents the net income (loss) per common share for the three months ended March 31, 2022 and 2021: Three Months Ended March 31, 2022 2021 Net income (loss) Income (loss) from continuing operations $ 401,004 $ (32,691) Loss from discontinued operations (113) (237) Net income (loss) $ 400,891 $ (32,928) Basic Weighted average common shares outstanding - basic 18,574,026 18,361,444 Basic income (loss) per common share: Income (loss) from continuing operations $ 21.59 $ (1.78) Loss from discontinued operations (0.01) (0.01) Net income (loss) $ 21.58 $ (1.79) Diluted Weighted average common shares outstanding - basic 18,574,026 18,361,444 Diluted effect of warrants 443,273 — Diluted effect of stock options 7,119 — Diluted effect of other stock-based instruments 516,224 — Weighted average common shares outstanding - diluted 19,540,642 18,361,444 Diluted income (loss) per common share: Income (loss) from continuing operations $ 20.52 $ (1.78) Loss from discontinued operations — (0.01) Net income (loss) $ 20.52 $ (1.79)

Inventories, net (Tables)

Inventories, net (Tables)	3 Months Ended
	Mar. 31, 2022
Inventory Disclosure [Abstract]
Schedule of Inventory	Inventories, net consisted of the following: March 31, 2022 December 31, 2021 Raw coal $ 29,637 $ 20,347 Saleable coal 99,040 81,240 Materials, supplies and other, net 33,076 27,795 Total inventories, net $ 161,753 $ 129,382

Long-Term Debt (Tables)

Long-Term Debt (Tables)	3 Months Ended
	Mar. 31, 2022
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments	Long-term debt consisted of the following: March 31, 2022 December 31, 2021 Term Loan Credit Facility - due June 2024 $ 249,435 $ 449,435 Other (1) 5,029 5,311 Debt discount and issuance costs (3,094) (6,195) Total long-term debt $ 251,370 $ 448,551 Less current portion (2,434) (2,989) Long-term debt, net of current portion $ 248,936 $ 445,562 (1) Includes financing leases.

Acquisition-Related Obligatio_2

Acquisition-Related Obligations (Tables)	3 Months Ended
	Mar. 31, 2022
Fair Value Disclosures [Abstract]
Schedule of Acquisition-Related Obligations	Acquisition-related obligations consisted of the following: March 31, 2022 December 31, 2021 Contingent Revenue Obligation $ 44,366 $ 35,005 Environmental Settlement Obligations 5,238 6,633 Discount (124) (233) Total acquisition-related obligations $ 49,480 $ 41,405 Less current portion (21,281) (22,405) Acquisition-related obligations, net of current portion $ 28,199 $ 19,000

Asset Retirement Obligations (T

Asset Retirement Obligations (Tables)	3 Months Ended
	Mar. 31, 2022
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, 2022: Total asset retirement obligations at December 31, 2021 $ 164,172 Accretion for the period 5,954 Revisions in estimated cash flows (337) Expenditures for the period (3,695) Total asset retirement obligations at March 31, 2022 166,094 Less current portion (1) (32,375) Long-term portion $ 133,719 (1) Included within Accrued expenses and other current liabilities on the Company’s Condensed Consolidated Balance Sheets.

Fair Value of Financial Instr_2

Fair Value of Financial Instruments and Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2022
Fair Value Disclosures [Abstract]
Fair Value Measurements, Nonrecurring	The following tables set forth by level, within the fair value hierarchy, the Company’s long-term debt at fair value as of March 31, 2022 and December 31, 2021: March 31, 2022 Carrying Amount (1) Total Fair Value Quoted Prices in Active Markets Significant Other Observable Inputs Significant Unobservable Inputs Term Loan Credit Facility - due June 2024 $ 246,341 $ 249,955 $ — $ 249,955 $ — Total long-term debt $ 246,341 $ 249,955 $ — $ 249,955 $ — December 31, 2021 Carrying Amount (1) Total Fair Value Quoted Prices in Active Markets Significant Other Observable Inputs Significant Unobservable Inputs Term Loan Credit Facility - due June 2024 $ 443,241 $ 447,561 $ — $ 447,561 $ — Total long-term debt $ 443,241 $ 447,561 $ — $ 447,561 $ — (1) Net of debt discounts and debt issuance costs. The following tables set forth by level, within the fair value hierarchy, the Company’s acquisition-related obligations at fair value as of March 31, 2022 and December 31, 2021: March 31, 2022 Carrying Amount (1) Total Fair Value Quoted Prices in Active Markets Significant Other Observable Inputs Significant Unobservable Inputs Environmental Settlement Obligations $ 5,114 $ 5,046 $ — $ — $ 5,046 Total acquisition-related obligations $ 5,114 $ 5,046 $ — $ — $ 5,046 December 31, 2021 Carrying Amount (1) Total Fair Value Quoted Prices in Active Markets Significant Other Observable Inputs Significant Unobservable Inputs Environmental Settlement Obligations $ 6,400 $ 6,270 $ — $ — $ 6,270 Total acquisition-related obligations $ 6,400 $ 6,270 $ — $ — $ 6,270 (1) Net of discounts.
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The following table sets 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, 2022 and December 31, 2021. 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, 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 $ 44,366 $ — $ — $ 44,366 Trading securities $ 50 $ — $ 50 $ — December 31, 2021 Total Fair Value Quoted Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Contingent Revenue Obligation $ 35,005 $ — $ — $ 35,005 Trading securities $ 28,443 $ 27,075 $ 1,368 $ — The following tables present a reconciliation 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, 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. December 31, 2020 Payments Loss (Gain) Recognized in Earnings (1) Transfer In (Out) of Level 3 Fair Value Hierarchy March 31, 2021 Contingent Revenue Obligation $ 28,967 $ — $ 3,176 $ — $ 32,143 (1) The loss recognized in earnings resulted primarily from a decrease in the annual risk-free interest rate as of March 31, 2021.
Range of Significant Unobservable Inputs	The range of significant unobservable inputs used to value the Contingent Revenue Obligation as of March 31, 2022 and December 31, 2021, are set forth in the following table: March 31, 2022 December 31, 2021 Forecasted future revenue $1.5 - $3.1 billion $1.5 - $2.0 billion Stated royalty rate 1.0% - 1.5% 1.0% - 1.5% Annualized volatility 20.7% - 39.3% (37.0%) 18.4% - 39.3% (29.9%)

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	3 Months Ended
	Mar. 31, 2022
Compensation Related Costs [Abstract]
Schedule of Net Periodic Benefit Cost	The following table details the components of the net periodic benefit credit for pension obligations: Three Months Ended March 31, 2022 2021 Interest cost $ 3,984 $ 3,422 Expected return on plan assets (7,185) (7,247) Amortization of net actuarial loss 484 875 Net periodic benefit credit $ (2,717) $ (2,950) The following table details the components of the net periodic benefit cost for black lung obligations: Three Months Ended March 31, 2022 2021 Service cost $ 654 $ 739 Interest cost 665 607 Expected return on plan assets (13) (14) Amortization of net actuarial loss 209 522 Net periodic benefit cost $ 1,515 $ 1,854

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Schedule of Restricted Cash Deposits	Amounts included in restricted cash provide collateral to secure the following obligations which have been written on the Company’s behalf: March 31, 2022 December 31, 2021 Workers’ compensation and black lung obligations $ 72,252 $ 70,637 Reclamation-related obligations 36,665 10,449 Financial payments and other performance obligations 9,559 8,340 Contingent Revenue Obligation escrow 17,556 11,977 Total restricted cash 136,032 101,403 Less current portion (1) (17,556) (11,977) Restricted cash, net of current portion $ 118,476 $ 89,426 (1) Included within Prepaid expenses and other current assets on the Company’s Condensed Consolidated Balance Sheets.
Schedule of Restricted Investments and Deposit Assets	Amounts included in restricted investments provide collateral to secure the following obligations which have been written on the Company’s behalf: March 31, 2022 December 31, 2021 Workers’ compensation obligations $ 50 $ 210 Reclamation-related obligations — 26,225 Financial payments and other performance obligations — 2,008 Total restricted investments (1), (2) $ 50 $ 28,443 (1) Included within Other non-current assets on the Company’s Condensed Consolidated Balance Sheets. (2) Classified as trading securities as of March 31, 2022 and December 31, 2021. Amounts included in deposits provide collateral to secure the following obligations which have been written on the Company’s behalf: March 31, 2022 December 31, 2021 Reclamation-related obligations $ 109 $ 118 Financial payments and other performance obligations 411 403 Other operating agreements 866 873 Total deposits (1) $ 1,386 $ 1,394 (1) Included within Prepaid expenses and other current assets and Other non-current assets on the Company’s Condensed Consolidated Balance Sheets.

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2022
Segment Reporting [Abstract]
Schedule of Segment Operating Results and Capital Expenditures	Segment operating results and capital expenditures for the three months ended March 31, 2022 and 2021 were as follows: 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 $ (9,494) $ 503,807 Capital expenditures $ 27,297 $ 849 $ 28,146 Three Months Ended March 31, 2021 Met All Other Consolidated Total revenues $ 359,878 $ 26,375 $ 386,253 Depreciation, depletion, and amortization $ 26,536 $ 1,902 $ 28,438 Amortization of acquired intangibles, net $ 4,051 $ (182) $ 3,869 Adjusted EBITDA $ 32,582 $ (3,699) $ 28,883 Capital expenditures $ 20,323 $ 72 $ 20,395 Three Months Ended March 31, 2022 2021 Total coal revenues $ 1,069,738 $ 385,452 Export coal revenues $ 894,525 $ 243,783 Export coal revenues as % of total coal revenues 84 % 63 % Countries with export coal revenue exceeding 10% of total revenue India India, Brazil Top customer as % of total revenue 29 % 13 % Top 10 customers as % of total revenue 73 % 63 % Number of customers exceeding 10% of total revenue 1 1 Number of customers exceeding 10% of total trade accounts receivable, net 1 3
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, 2022 and 2021: Three Months Ended March 31, 2022 Met All Other Consolidated Net income (loss) from continuing operations $ 478,167 $ (77,163) $ 401,004 Interest expense 49 13,034 13,083 Interest income (172) (12) (184) Income tax expense — 39,624 39,624 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 $ (9,494) $ 503,807 Three Months Ended March 31, 2021 Met All Other Consolidated Net loss from continuing operations $ (1,438) $ (31,253) $ (32,691) Interest expense 43 17,947 17,990 Interest income (5) (159) (164) Income tax benefit — (5) (5) Depreciation, depletion and amortization 26,536 1,902 28,438 Non-cash stock compensation expense 10 2,173 2,183 Mark-to-market adjustment - acquisition-related obligations — 3,176 3,176 Accretion on asset retirement obligations 3,385 3,263 6,648 Asset impairment and restructuring — (561) (561) Amortization of acquired intangibles, net 4,051 (182) 3,869 Adjusted EBITDA $ 32,582 $ (3,699) $ 28,883

Discontinued Operations - Narra

Discontinued Operations - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Discontinued Operations and Disposal Groups [Abstract]
Loss from discontinued operations before income taxes	$ (146)	$ (237)

Discontinued Operations - Major

Discontinued Operations - Major Components of Asset and Liabilities (Details) - Cumberland and PRB Transaction - Discontinued Operations - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Assets:
Prepaid expenses and other current assets	$ 69	$ 462
Other non-current assets	8,526	8,526
Liabilities:
Trade accounts payable, accrued expenses and other current liabilities	4,576	5,838
Workers’ compensation and black lung obligations, non-current	$ 23,390	$ 23,683

Revenue - Disaggregation of Rev

Revenue - Disaggregation of Revenue by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Revenues	$ 1,069,738	$ 385,452
Coal
Disaggregation of Revenue [Line Items]
Revenues	1,069,738	385,452
Met Coal
Disaggregation of Revenue [Line Items]
Revenues	1,047,993	342,994
Thermal Coal
Disaggregation of Revenue [Line Items]
Revenues	21,745	42,458
Export | Coal
Disaggregation of Revenue [Line Items]
Revenues	894,525	243,783
Export | Met Coal
Disaggregation of Revenue [Line Items]
Revenues	888,006	242,752
Export | Thermal Coal
Disaggregation of Revenue [Line Items]
Revenues	6,519	1,031
Domestic | Coal
Disaggregation of Revenue [Line Items]
Revenues	175,213	141,669
Domestic | Met Coal
Disaggregation of Revenue [Line Items]
Revenues	159,987	100,242
Domestic | Thermal Coal
Disaggregation of Revenue [Line Items]
Revenues	$ 15,226	$ 41,427

Revenue - Performance Obligatio

Revenue - Performance Obligations (Details) $ in Thousands	Mar. 31, 2022USD ($)
Disaggregation of Revenue [Line Items]
Estimated coal revenues	$ 112,149
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-04-01
Disaggregation of Revenue [Line Items]
Estimated coal revenues	$ 41,980
Revenue, remaining performance obligation, period	3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Disaggregation of Revenue [Line Items]
Estimated coal revenues	$ 32,919
Revenue, remaining performance obligation, period	1 year
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

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss - Changes to Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 546,909	$ 200,102
Ending balance	929,847	170,161
Employee benefit costs
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(58,503)	(111,985)
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive loss	775	1,484
Ending balance	$ (57,728)	$ (110,501)

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Loss - Summary of Amounts Reclassified (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Employee benefit costs:
Miscellaneous income, net	$ 1,797	$ 1,766
Income (loss) from continuing operations before income taxes	440,628	(32,696)
Income tax	(39,624)	5
Net income (loss)	400,891	(32,928)
Amounts reclassified from accumulated other comprehensive loss | Amortization of actuarial loss
Employee benefit costs:
Miscellaneous income, net	784	1,484
Amounts reclassified from accumulated other comprehensive loss | Settlement
Employee benefit costs:
Miscellaneous income, net	(9)	0
Amounts reclassified from accumulated other comprehensive loss | Employee benefit costs
Employee benefit costs:
Income (loss) from continuing operations before income taxes	775	1,484
Income tax	0	0
Net income (loss)	$ 775	$ 1,484

Net Income (Loss) Per Share - N

Net Income (Loss) Per Share - Narrative (Details) - shares	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	0	954,248
Weighted-average antidilutive securities excluded from computation of earnings per share (in shares)		323,236

Net Income (Loss) Per Share - S

Net Income (Loss) Per Share - Schedule of Net (Loss) Income Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Net income (loss)
Income (loss) from continuing operations	$ 401,004	$ (32,691)
Loss from discontinued operations	(113)	(237)
Net income (loss)	$ 400,891	$ (32,928)
Basic
Weighted average common shares outstanding - basic (in shares)	18,574,026	18,361,444
Basic income (loss) per common share:
Income (loss) from continuing operations (in dollars per share)	$ 21.59	$ (1.78)
Loss from discontinued operations (in dollars per share)	(0.01)	(0.01)
Net income (loss) (in dollars per share)	$ 21.58	$ (1.79)
Diluted
Weighted average common shares outstanding - basic (in shares)	18,574,026	18,361,444
Diluted effect of warrants (in shares)	443,273	0
Weighted average common shares outstanding - diluted (in shares)	19,540,642	18,361,444
Diluted income (loss) per common share:
Income (loss) from continuing operations (in dollars per share)	$ 20.52	$ (1.78)
Loss from discontinued operations (in dollars per share)	0	(0.01)
Net income (loss) (in dollars per share)	$ 20.52	$ (1.79)
Stock Options
Diluted
Dilutive effect of share-based payment awards (in shares)	7,119	0
Other Stock-Based Instruments
Diluted
Dilutive effect of share-based payment awards (in shares)	516,224	0

Inventories, net (Details)

Inventories, net (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Inventory [Line Items]
Total inventories, net	$ 161,753	$ 129,382
Coal
Inventory [Line Items]
Raw coal	29,637	20,347
Saleable coal	99,040	81,240
Material, supplies and other, net
Inventory [Line Items]
Materials, supplies and other, net	$ 33,076	$ 27,795

Capital Stock - Share Repurchas

Capital Stock - Share Repurchase Program (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 04, 2022
Equity [Abstract]
Authorized share repurchases		$ 150,000,000
Number of shares repurchased	133,501
Total share repurchase price	$ 16,547,000
Value of shares repurchased	16,543,000
Shares repurchased, fees	$ 4,000

Capital Stock - Warrants (Detai

Capital Stock - Warrants (Details) - $ / shares	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Jul. 26, 2016
Equity [Abstract]
Number of warrants outstanding (in shares)	744,845	801,370	810,811
Exercise price of warrants (in dollars per share)	$ 46.911	$ 46.911
Number of securities called by each warrant (in shares)	1.15	1.15
Number of securities called by outstanding warrants (in shares)	856,572	921,576
Shares issued upon exercise of warrants (in shares)	64,861	0
Shares withheld upon exercise of warrants (in shares)	91

Long-Term Debt - Schedule of Lo

Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Debt discount and issuance costs	$ (3,094)	$ (6,195)
Total long-term debt	251,370	448,551
Less current portion	(2,434)	(2,989)
Long-term debt, net of current portion	248,936	445,562
Term Loan | Term Loan Credit Facility - due June 2024
Debt Instrument [Line Items]
Total long-term debt, gross	249,435	449,435
Other
Debt Instrument [Line Items]
Total long-term debt, gross	$ 5,029	$ 5,311

Long-Term Debt - Term Loan Cred

Long-Term Debt - Term Loan Credit Facility (Details) - Term Loan Credit Facility - due June 2024 - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Term Loan
Debt Instrument [Line Items]
Payment of borrowings	$ 200,000
Term Loan
Debt Instrument [Line Items]
Outstanding borrowings	$ 246,341	$ 443,241
Term Loan | Eurocurrency
Debt Instrument [Line Items]
Interest rate at period end (as a percent)	10.00%
Basis spread on variable rate (as a percent)	8.00%

Long-Term Debt - Second Amended

Long-Term Debt - Second Amended and Restated Asset-Based Revolving Credit Agreement (Details) - New ABL Facility - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Dec. 06, 2021
Line of Credit
Debt Instrument [Line Items]
Letters of credit outstanding	$ 121,037	$ 121,037
Revolving Credit Facility
Debt Instrument [Line Items]
Amount of credit facility			$ 155,000
Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Outstanding borrowings	0	$ 0
Letters of credit outstanding	$ 121,037
Letter of Credit
Debt Instrument [Line Items]
Amount of credit facility			150,000
Amount of credit facility on committed basis			125,000
Amount of credit facility on uncommitted basis			$ 25,000

Acquisition-Related Obligatio_3

Acquisition-Related Obligations - Summary of Acquisition-Related Obligations (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Fair Value, Option, Quantitative Disclosures [Line Items]
Discount	$ (124)	$ (233)
Total acquisition-related obligations	49,480	41,405
Less current portion	(21,281)	(22,405)
Acquisition-related obligations, net of current portion	28,199	19,000
Contingent Revenue Obligation
Fair Value, Option, Quantitative Disclosures [Line Items]
Total acquisition-related obligations - long-term, gross	44,366	35,005
Total acquisition-related obligations	44,366	35,005
Less current portion	(16,166)	(16,005)
Environmental Settlement Obligations
Fair Value, Option, Quantitative Disclosures [Line Items]
Total acquisition-related obligations - long-term, gross	$ 5,238	$ 6,633

Acquisition-Related Obligatio_4

Acquisition-Related Obligations - Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Business Acquisition, Contingent Consideration [Line Items]
Acquisition related obligations	$ 49,480	$ 41,405
Acquisition related obligations, current	21,281	22,405
Contingent Revenue Obligation
Business Acquisition, Contingent Consideration [Line Items]
Acquisition related obligations	44,366	35,005
Acquisition related obligations, current	$ 16,166	$ 16,005

Asset Retirement Obligations (D

Asset Retirement Obligations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Total asset retirement obligations at December 31, 2021	$ 164,172
Accretion for the period	5,954	$ 6,648
Revisions in estimated cash flows	(337)
Expenditures for the period	(3,695)
Total asset retirement obligations at March 31, 2022	166,094		$ 164,172
Less current portion	(32,375)
Long-term portion	$ 133,719		$ 132,013

Fair Value of Financial Instr_3

Fair Value of Financial Instruments and Fair Value Measurements - Total Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total long term debt	$ 246,341	$ 443,241
Carrying Amount | Term Loan | Term Loan Credit Facility - due June 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total long term debt	246,341	443,241
Fair Value, Measurements, Nonrecurring | Total Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total long term debt	249,955	447,561
Fair Value, Measurements, Nonrecurring | Total Fair Value | Quoted Prices in Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total long term debt	0	0
Fair Value, Measurements, Nonrecurring | Total Fair Value | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total long term debt	249,955	447,561
Fair Value, Measurements, Nonrecurring | Total Fair Value | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total long term debt	0	0
Fair Value, Measurements, Nonrecurring | Total Fair Value | Term Loan | Term Loan Credit Facility - due June 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total long term debt	249,955	447,561
Fair Value, Measurements, Nonrecurring | Total Fair Value | Term Loan | Term Loan Credit Facility - due June 2024 | Quoted Prices in Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total long term debt	0	0
Fair Value, Measurements, Nonrecurring | Total Fair Value | Term Loan | Term Loan Credit Facility - due June 2024 | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total long term debt	249,955	447,561
Fair Value, Measurements, Nonrecurring | Total Fair Value | Term Loan | Term Loan Credit Facility - due June 2024 | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total long term debt	$ 0	$ 0

Fair Value of Financial Instr_4

Fair Value of Financial Instruments and Fair Value Measurements - Acquisition-related Obligations at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total acquisition-related obligations	$ 5,114	$ 6,400
Carrying Amount | Environmental Settlement Obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total acquisition-related obligations	5,114	6,400
Fair Value, Measurements, Nonrecurring | Total Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total acquisition-related obligations	5,046	6,270
Fair Value, Measurements, Nonrecurring | Total Fair Value | Quoted Prices in Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total acquisition-related obligations	0	0
Fair Value, Measurements, Nonrecurring | Total Fair Value | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total acquisition-related obligations	0	0
Fair Value, Measurements, Nonrecurring | Total Fair Value | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total acquisition-related obligations	5,046	6,270
Fair Value, Measurements, Nonrecurring | Total Fair Value | Environmental Settlement Obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total acquisition-related obligations	5,046	6,270
Fair Value, Measurements, Nonrecurring | Total Fair Value | Environmental Settlement Obligations | Quoted Prices in Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total acquisition-related obligations	0	0
Fair Value, Measurements, Nonrecurring | Total Fair Value | Environmental Settlement Obligations | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total acquisition-related obligations	0	0
Fair Value, Measurements, Nonrecurring | Total Fair Value | Environmental Settlement Obligations | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total acquisition-related obligations	$ 5,046	$ 6,270

Fair Value of Financial Instr_5

Fair Value of Financial Instruments and Fair Value Measurements - Schedule of Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Contingent Revenue Obligation	$ 44,366	$ 35,005
Trading securities	50	28,443
Quoted Prices in Active Markets (Level 1)
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Contingent Revenue Obligation	0	0
Trading securities	0	27,075
Significant Other Observable Inputs (Level 2)
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Contingent Revenue Obligation	0	0
Trading securities	50	1,368
Significant Unobservable Inputs (Level 3)
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Contingent Revenue Obligation	44,366	35,005
Trading securities	$ 0	$ 0

Fair Value of Financial Instr_6

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, 2022	Mar. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning balance	$ 35,005	$ 28,967
Payments	0	0
Loss (Gain) Recognized in Earnings	9,361	3,176
Transfer In (Out) of Level 3 Fair Value Hierarchy	0	0
Ending balance	$ 44,366	$ 32,143

Fair Value of Financial Instr_7

Fair Value of Financial Instruments and Fair Value Measurements - Narrative (Details)	Mar. 31, 2022	Dec. 31, 2021
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Valuation Technique, Discounted Cash Flow | Measurement Input, Discount Rate | Environmental Settlement Obligations [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Long-term debt and acquisition-related obligations, measurement input	0.12	0.13

Fair Value of Financial Instr_8

Fair Value of Financial Instruments and Fair Value Measurements - Unobservable Inputs (Details) - Black Scholes - Contingent Revenue Obligation $ in Billions	Mar. 31, 2022USD ($)	Dec. 31, 2021USD ($)
Forecasted future revenue | Minimum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Forecasted future revenue	$ 1.5	$ 1.5
Forecasted future revenue | Maximum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Forecasted future revenue	$ 3.1	$ 2
Stated royalty rate | Minimum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Acquisition-related obligation, measurement input	0.010	0.010
Stated royalty rate | Maximum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Acquisition-related obligation, measurement input	0.015	0.015
Annualized volatility | Minimum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Acquisition-related obligation, measurement input	0.207	0.184
Annualized volatility | Maximum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Acquisition-related obligation, measurement input	0.393	0.393
Annualized volatility | Weighted Average
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Acquisition-related obligation, measurement input	0.370	0.299

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ 39,624	$ (5)
Income (loss) from continuing operations before income taxes	440,628	$ (32,696)
Decrease in deferred tax asset valuation allowance	23,453
Current federal and state income tax payable	$ 38,249

Employee Benefit Plans (Details

Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Pension
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest cost	$ 3,984	$ 3,422
Expected return on plan assets	(7,185)	(7,247)
Amortization of net actuarial loss	484	875
Net periodic benefit credit	(2,717)	(2,950)
Black Lung
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	654	739
Interest cost	665	607
Expected return on plan assets	(13)	(14)
Amortization of net actuarial loss	209	522
Net periodic benefit credit	$ 1,515	$ 1,854

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) T in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022USD ($)T	Mar. 31, 2021USD ($)T	Feb. 10, 2022USD ($)	Dec. 31, 2021USD ($)	Feb. 21, 2020USD ($)	Feb. 20, 2020USD ($)
Long-term Purchase Commitment [Line Items]
Coal royalty expense	$ 57,343	$ 18,758
Black Lung
Long-term Purchase Commitment [Line Items]
Collateral for black lung obligations			$ 10,000		$ 65,700	$ 2,600
Surety Bond
Long-term Purchase Commitment [Line Items]
Outstanding surety bonds	174,198
Reclamation-Related Obligations
Long-term Purchase Commitment [Line Items]
Letters of credit outstanding	15,548
Reclamation-Related Obligations | Collateral Pledged
Long-term Purchase Commitment [Line Items]
Restricted cash and deposits	36,774
Line of Credit | New ABL Facility
Long-term Purchase Commitment [Line Items]
Letters of credit outstanding	121,037			$ 121,037
Revolving Credit Facility | Line of Credit | New ABL Facility
Long-term Purchase Commitment [Line Items]
Letters of credit outstanding	121,037
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	1,600
Purchase and sale contingency, mass purchases and sales, remainder of year	$ 61,853
Purchase and sale contingency, mass purchased and sold (in tons) | T	419	700
Purchase and sale contingency, mass purchased and sold, amount	$ 16,185	$ 27,066
Coal Purchase Agreements
Long-term Purchase Commitment [Line Items]
Minimum quantities to be purchased, remainder of 2022	$ 71,226

Commitments and Contingencies_2

Commitments and Contingencies - Schedule of Restricted Cash Deposits (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Long-term Purchase Commitment [Line Items]
Total restricted cash	$ 136,032	$ 101,403
Less current portion	(17,556)	(11,977)	$ (11,427)
Long-term restricted cash	118,476	89,426	$ 85,640
Workers’ compensation and black lung obligations
Long-term Purchase Commitment [Line Items]
Total restricted cash	72,252	70,637
Reclamation-related obligations
Long-term Purchase Commitment [Line Items]
Total restricted cash	36,665	10,449
Financial payments and other performance obligations
Long-term Purchase Commitment [Line Items]
Total restricted cash	9,559	8,340
Contingent Revenue Obligation escrow
Long-term Purchase Commitment [Line Items]
Total restricted cash	$ 17,556	$ 11,977

Commitments and Contingencies_3

Commitments and Contingencies - Schedule of Restricted Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Long-term Purchase Commitment [Line Items]
Total restricted investments	$ 50	$ 28,443
Workers’ compensation obligations
Long-term Purchase Commitment [Line Items]
Total restricted investments	50	210
Reclamation-related obligations
Long-term Purchase Commitment [Line Items]
Total restricted investments	0	26,225
Financial payments and other performance obligations
Long-term Purchase Commitment [Line Items]
Total restricted investments	$ 0	$ 2,008

Commitments and Contingencies_4

Commitments and Contingencies - Cash Deposits Held by Third Parties (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Long-term Purchase Commitment [Line Items]
Total deposits	$ 1,386	$ 1,394
Reclamation-related obligations
Long-term Purchase Commitment [Line Items]
Total deposits	109	118
Financial payments and other performance obligations
Long-term Purchase Commitment [Line Items]
Total deposits	411	403
Other operating agreements
Long-term Purchase Commitment [Line Items]
Total deposits	$ 866	$ 873

Segment Information - Schedule

Segment Information - Schedule of Operating Results and Capital Expenditures (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022USD ($)minesegmentplant	Mar. 31, 2021USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	1
Total revenues	$ 1,071,964	$ 386,253
Depreciation, depletion and amortization	28,035	28,438
Amortization of acquired intangibles, net	5,748	3,869
Adjusted EBITDA	503,807	28,883
Capital expenditures	28,146	20,395
Operating Segments | Met
Segment Reporting Information [Line Items]
Total revenues	1,055,689	359,878
Depreciation, depletion and amortization	27,060	26,536
Amortization of acquired intangibles, net	4,796	4,051
Adjusted EBITDA	513,301	32,582
Capital expenditures	$ 27,297	20,323
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	14
Number of preparation plants | plant	5
All Other
Segment Reporting Information [Line Items]
Total revenues	$ 16,275	26,375
Depreciation, depletion and amortization	975	1,902
Amortization of acquired intangibles, net	952	(182)
Adjusted EBITDA	(9,494)	(3,699)
Capital expenditures	$ 849	$ 72
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, 2022	Mar. 31, 2021
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net income (loss) from continuing operations	$ 401,004	$ (32,691)
Interest expense	13,083	17,990
Interest income	(184)	(164)
Income tax expense	39,624	(5)
Depreciation, depletion and amortization	28,035	28,438
Non-cash stock compensation expense	1,182	2,183
Mark-to-market adjustment for acquisition-related obligations	9,361	3,176
Accretion on asset retirement obligations	5,954	6,648
Asset impairment and restructuring	0	(561)
Amortization of acquired intangibles, net	5,748	3,869
Adjusted EBITDA	503,807	28,883
Operating Segments | Met
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net income (loss) from continuing operations	478,167	(1,438)
Interest expense	49	43
Interest income	(172)	(5)
Income tax expense	0	0
Depreciation, depletion and amortization	27,060	26,536
Non-cash stock compensation expense	3	10
Mark-to-market adjustment for acquisition-related obligations	0	0
Accretion on asset retirement obligations	3,398	3,385
Asset impairment and restructuring		0
Amortization of acquired intangibles, net	4,796	4,051
Adjusted EBITDA	513,301	32,582
All Other
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net income (loss) from continuing operations	(77,163)	(31,253)
Interest expense	13,034	17,947
Interest income	(12)	(159)
Income tax expense	39,624	(5)
Depreciation, depletion and amortization	975	1,902
Non-cash stock compensation expense	1,179	2,173
Mark-to-market adjustment for acquisition-related obligations	9,361	3,176
Accretion on asset retirement obligations	2,556	3,263
Asset impairment and restructuring		(561)
Amortization of acquired intangibles, net	952	(182)
Adjusted EBITDA	$ (9,494)	$ (3,699)

Segment Information - Revenue f

Segment Information - Revenue from External Customers (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022USD ($)customer	Mar. 31, 2021USD ($)customer
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues | $	$ 1,069,738	$ 385,452
Export Coal Revenue
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues | $	$ 894,525	$ 243,783
Revenues | Geographic Concentration Risk | Export Coal Revenue
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk (as a percent)	84.00%	63.00%
Revenues | Customer Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of customers | customer	1	1
Revenues | Customer Concentration Risk | Top Customer
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk (as a percent)	29.00%	13.00%
Revenues | Customer Concentration Risk | Top 10 Customers
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk (as a percent)	73.00%	63.00%
Accounts Receivable | Customer Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of customers | customer	1	3

Subsequent Events (Details)

Subsequent Events (Details) - USD ($)	3 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	May 03, 2022	Mar. 04, 2022
Subsequent Event [Line Items]
Authorized share repurchases				$ 150,000,000
Subsequent Event
Subsequent Event [Line Items]
Authorized share repurchases			$ 600,000,000
Dividends payable (in dollars per share)			$ 1.50
Dividends payable, quarterly (in dollars per share)			$ 0.375
Term Loan | Term Loan Credit Facility - due June 2024
Subsequent Event [Line Items]
Payment of borrowings		$ 200,000,000
Forecast | Term Loan | Term Loan Credit Facility - due June 2024
Subsequent Event [Line Items]
Payment of borrowings	$ 150,000,000