$AMR
Alpha Metallurgical Resources, Inc. Stock $amr

$amr Overview Financials Valuation SEC Filings Company Website

2021 Q4 Form 10-K Financial Statement

#000170471522000012 Filed on March 07, 2022

Income Statement

Concept	2021 Q4	2021	2020 Q4
Revenue	$828.2M	$2.259B	$133.2M
YoY Change	521.78%	59.48%	-73.31%
Cost Of Revenue	$497.4M	$1.680B	$132.6M
YoY Change	275.1%	31.13%	-29.36%
Gross Profit	$330.8M	$578.8M	$600.0K
YoY Change	55039.17%	328.14%	-97.32%
Gross Profit Margin	39.95%	25.63%	0.45%
Selling, General & Admin	$19.01M	$63.90M	$15.30M
YoY Change	24.25%	11.41%	-40.7%
% of Gross Profit	5.75%	11.04%	2550.0%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$33.63M	$123.3M	$1.900M
YoY Change	1669.89%	-23.71%	-112.18%
% of Gross Profit	10.16%	21.3%	316.67%
Operating Expenses	$53.51M	$63.90M	$7.300M
YoY Change	632.96%	11.41%	-89.33%
Operating Profit	$277.3M	$357.1M	-$6.700M
YoY Change	-4239.24%	-309.24%	-85.43%
Interest Expense	-$19.34M	$69.65M	-$20.00M
YoY Change	-3.3%	-6.54%	12.36%
% of Operating Profit	-6.97%	19.5%
Other Income/Expense, Net	$1.442M	-$66.60M	-$900.0K
YoY Change	-260.22%	-8.7%	-87.67%
Pretax Income	$257.9M	$290.5M	$105.3M
YoY Change	144.93%	-219.25%	-141.65%
Income Tax	$3.398M	$3.609M	$0.00
% Of Pretax Income	1.32%	1.24%	0.0%
Net Earnings	$257.4M	$288.8M	-$100.2M
YoY Change	-356.93%	-164.62%	-28.91%
Net Earnings / Revenue	31.08%	12.79%	-75.23%
Basic Earnings Per Share		$15.66
Diluted Earnings Per Share	$13.45M	$15.30	-$5.475M
COMMON SHARES
Basic Shares Outstanding	18.40M shares	18.44M shares	18.31M shares
Diluted Shares Outstanding		18.87M shares

Balance Sheet

Concept	2021 Q4	2021	2020 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$81.21M	$81.21M	$139.2M
YoY Change	-41.66%	-41.66%	-34.59%
Cash & Equivalents	$81.21M	$81.21M	$139.2M
Short-Term Investments
Other Short-Term Assets	$48.15M	$43.99M	$117.2M
YoY Change	-58.91%	11.65%	28.23%
Inventory	$129.4M	$129.4M	$108.1M
Prepaid Expenses
Receivables	$489.2M	$489.2M	$145.7M
Other Receivables	$4.161M	$4.161M	$13.25M
Total Short-Term Assets	$748.0M	$748.0M	$510.1M
YoY Change	46.63%	46.64%	-28.3%
LONG-TERM ASSETS
Property, Plant & Equipment	$806.5M	$811.5M	$832.5M
YoY Change	-3.12%	-2.52%	42.73%
Goodwill	$0.00
YoY Change
Intangibles	$74.20M		$88.20M
YoY Change	-15.87%		-29.02%
Long-Term Investments	$20.46M	$20.46M	$18.38M
YoY Change	11.3%	11.2%	-0.16%
Other Assets	$102.6M	$203.5M	$149.4M
YoY Change	-31.31%	-11.81%	-21.16%
Total Long-Term Assets	$1.110B	$1.110B	$1.170B
YoY Change	-5.15%	-5.15%	-26.48%
TOTAL ASSETS
Total Short-Term Assets	$748.0M	$748.0M	$510.1M
Total Long-Term Assets	$1.110B	$1.110B	$1.170B
Total Assets	$1.858B	$1.858B	$1.680B
YoY Change	10.57%	10.57%	-27.04%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$90.09M	$90.09M	$58.41M
YoY Change	54.23%	54.26%	-29.39%
Accrued Expenses	$174.6M	$109.3M	$140.4M
YoY Change	24.36%	44.9%	0.66%
Deferred Revenue	$0.00		$13.20M
YoY Change	-100.0%
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$2.989M	$2.989M	$28.80M
YoY Change	-89.62%	-89.62%	1.05%
Total Short-Term Liabilities	$295.9M	$295.9M	$259.1M
YoY Change	14.23%	14.21%	-17.8%
LONG-TERM LIABILITIES
Long-Term Debt	$445.6M	$445.6M	$553.7M
YoY Change	-19.53%	-19.53%	-1.91%
Other Long-Term Liabilities	$26.18M	$569.0M	$28.07M
YoY Change	-6.75%	-14.67%	4.66%
Total Long-Term Liabilities	$26.18M	$1.015B	$28.07M
YoY Change	-6.75%	-16.87%	4.66%
TOTAL LIABILITIES
Total Short-Term Liabilities	$295.9M	$295.9M	$259.1M
Total Long-Term Liabilities	$26.18M	$1.015B	$28.07M
Total Liabilities	$1.311B	$1.311B	$1.480B
YoY Change	-11.43%	-11.43%	-7.89%
SHAREHOLDERS EQUITY
Retained Earnings	-$71.74M		-$360.5M
YoY Change	-80.1%		-515.31%
Common Stock	$208.0K		$206.0K
YoY Change	0.97%		0.49%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$107.8M		$107.0M
YoY Change	0.73%		-0.9%
Treasury Stock Shares
Shareholders Equity	$546.9M	$546.9M	$200.1M
YoY Change
Total Liabilities & Shareholders Equity	$1.858B	$1.858B	$1.680B
YoY Change	10.57%	10.57%	-27.04%

Cashflow Statement

Concept	2021 Q4	2021	2020 Q4
OPERATING ACTIVITIES
Net Income	$257.4M	$288.8M	-$100.2M
YoY Change	-356.93%	-164.62%	-28.91%
Depreciation, Depletion And Amortization	$33.63M	$123.3M	$1.900M
YoY Change	1669.89%	-23.71%	-112.18%
Cash From Operating Activities	$104.4M	$174.9M	$56.20M
YoY Change	85.71%	35.37%	-1085.96%
INVESTING ACTIVITIES
Capital Expenditures	-$22.91M	-$83.30M	-$35.10M
YoY Change	-34.72%	-45.91%	-27.18%
Acquisitions
YoY Change
Other Investing Activities	-$4.639M	$3.382M	-$50.10M
YoY Change	-90.74%	-4492.21%	-307.88%
Cash From Investing Activities	-$27.55M	-$89.86M	-$85.20M
YoY Change	-67.66%	-57.21%	252.07%
FINANCING ACTIVITIES
Cash Dividend Paid		$0.00
YoY Change
Common Stock Issuance & Retirement, Net		$786.0K
YoY Change		276.08%
Debt Paid & Issued, Net		$119.1M
YoY Change		55.7%
Cash From Financing Activities	-64.13M	-$147.0M	-19.10M
YoY Change	235.75%	557.15%	241.07%
NET CHANGE
Cash From Operating Activities	104.4M	$174.9M	56.20M
Cash From Investing Activities	-27.55M	-$89.86M	-85.20M
Cash From Financing Activities	-64.13M	-$147.0M	-19.10M
Net Change In Cash	12.69M	-$61.96M	-48.10M
YoY Change	-126.38%	-39.91%	35.49%
FREE CASH FLOW
Cash From Operating Activities	$104.4M	$174.9M	$56.20M
Capital Expenditures	-$22.91M	-$83.30M	-$35.10M
Free Cash Flow	$127.3M	$258.2M	$91.30M
YoY Change	39.41%	-8.82%	114.82%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2021	dei	Entity Central Index Key EntityCentralIndexKey	0001704715
CY2021	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2021
CY2021	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2021	dei	Amendment Flag AmendmentFlag	false
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CY2021Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2021Q4	us-gaap	Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
CY2020Q4	us-gaap	Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#OtherAssetsNoncurrent
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#OtherAssetsNoncurrent
CY2021Q4	us-gaap	Finance Lease Liability Current Statement Of Financial Position Extensible List FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#LongTermDebtAndCapitalLeaseObligationsCurrent
CY2020Q4	us-gaap	Finance Lease Liability Current Statement Of Financial Position Extensible List FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#LongTermDebtAndCapitalLeaseObligationsCurrent
CY2020Q4	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://www.alphametresources.com/20211231#AccruedLiabilitiesandOtherLiabilitiesCurrent
CY2021Q4	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://www.alphametresources.com/20211231#AccruedLiabilitiesandOtherLiabilitiesCurrent
CY2020Q4	us-gaap	Finance Lease Liability Noncurrent Statement Of Financial Position Extensible List FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#LongTermDebtAndCapitalLeaseObligations
CY2021Q4	us-gaap	Finance Lease Liability Noncurrent Statement Of Financial Position Extensible List FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#LongTermDebtAndCapitalLeaseObligations
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent Statement Of Financial Position Extensible List OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#OtherLiabilitiesNoncurrent
CY2021Q4	us-gaap	Operating Lease Liability Noncurrent Statement Of Financial Position Extensible List OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#OtherLiabilitiesNoncurrent
CY2021	dei	Document Type DocumentType	10-K
CY2021	dei	Document Annual Report DocumentAnnualReport	true
CY2021	dei	Document Period End Date DocumentPeriodEndDate	2021-12-31
CY2021	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2021	dei	Document Transition Report DocumentTransitionReport	false
CY2021	dei	Entity File Number EntityFileNumber	001-38735
CY2021	dei	Entity Registrant Name EntityRegistrantName	ALPHA METALLURGICAL RESOURCES, INC.
CY2021	dei	Entity Registrant Name EntityRegistrantName	ALPHA METALLURGICAL RESOURCES, INC.
CY2021	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2021	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	81-3015061
CY2021	dei	Entity Address Address Line1 EntityAddressAddressLine1	340 Martin Luther King Jr. Blvd.
CY2021	dei	Entity Address City Or Town EntityAddressCityOrTown	Bristol
CY2021	dei	Entity Address State Or Province EntityAddressStateOrProvince	TN
CY2021	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	37620
CY2021	dei	City Area Code CityAreaCode	423
CY2021	dei	Local Phone Number LocalPhoneNumber	573-0300
CY2021	dei	Security12b Title Security12bTitle	Common Stock, par value $0.01 per share
CY2021	dei	Trading Symbol TradingSymbol	AMR
CY2021	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2021	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No
CY2021	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2021	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2021	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2021	dei	Entity Filer Category EntityFilerCategory	Accelerated Filer
CY2021	dei	Entity Small Business EntitySmallBusiness	true
CY2021	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2021	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2021	dei	Entity Shell Company EntityShellCompany	false
CY2021Q2	dei	Entity Public Float EntityPublicFloat	270000000	USD
CY2022Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	18532992	shares
CY2021	dei	Auditor Firm AuditorFirmId	49
CY2021	dei	Auditor Name AuditorName	RSM US LLP
CY2021	dei	Auditor Location AuditorLocation	Atlanta, Georgia
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2252597000	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1413124000	USD
CY2021	us-gaap	Other Income OtherIncome	5989000	USD
CY2020	us-gaap	Other Income OtherIncome	3063000	USD
CY2021	us-gaap	Revenues Revenues	2258586000	USD
CY2020	us-gaap	Revenues Revenues	1416187000	USD
CY2021	us-gaap	Cost Of Goods And Service Excluding Depreciation Depletion And Amortization CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization	1679742000	USD
CY2020	us-gaap	Cost Of Goods And Service Excluding Depreciation Depletion And Amortization CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization	1281011000	USD
CY2021	amr	Depreciation Depletion And Amortization Excluding Acquired Intangibles DepreciationDepletionAndAmortizationExcludingAcquiredIntangibles	110047000	USD
CY2020	amr	Depreciation Depletion And Amortization Excluding Acquired Intangibles DepreciationDepletionAndAmortizationExcludingAcquiredIntangibles	139885000	USD
CY2021	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	26520000	USD
CY2020	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	26504000	USD
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	13244000	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	9214000	USD
CY2021	us-gaap	Restructuring Costs And Asset Impairment Charges RestructuringCostsAndAssetImpairmentCharges	-561000	USD
CY2020	us-gaap	Restructuring Costs And Asset Impairment Charges RestructuringCostsAndAssetImpairmentCharges	83878000	USD
CY2021	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	63901000	USD
CY2020	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	57356000	USD
CY2021	amr	Acquisition Related Obligations Changesin Fair Value Gain Loss AcquisitionRelatedObligationsChangesinFairValueGainLoss	-19525000	USD
CY2020	amr	Acquisition Related Obligations Changesin Fair Value Gain Loss AcquisitionRelatedObligationsChangesinFairValueGainLoss	8750000	USD
CY2021	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	10972000	USD
CY2020	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	2223000	USD
CY2021	us-gaap	Costs And Expenses CostsAndExpenses	1901446000	USD
CY2020	us-gaap	Costs And Expenses CostsAndExpenses	1586875000	USD
CY2021	us-gaap	Operating Income Loss OperatingIncomeLoss	357140000	USD
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	-170688000	USD
CY2021	us-gaap	Interest Expense InterestExpense	69654000	USD
CY2020	us-gaap	Interest Expense InterestExpense	74528000	USD
CY2021	us-gaap	Investment Income Interest InvestmentIncomeInterest	334000	USD
CY2020	us-gaap	Investment Income Interest InvestmentIncomeInterest	7027000	USD
CY2021	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-4149000	USD
CY2020	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-3473000	USD
CY2021	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	6867000	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-1972000	USD
CY2021	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-66602000	USD
CY2020	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-72946000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	290538000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-243634000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3609000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-2164000	USD
CY2021	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	286929000	USD
CY2020	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-241470000	USD
CY2021	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	1660000	USD
CY2020	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	-205429000	USD
CY2021	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	-201000	USD
CY2020	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	0	USD
CY2021	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	1861000	USD
CY2020	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-205429000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	288790000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	-446899000	USD
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CY2021	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	0.10
CY2020	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	-11.22
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CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-24.42
CY2021	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	15.20
CY2020	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-13.20
CY2021	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare	0.10
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CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	15.30
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-24.42
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	18441175	shares
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	18298362	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	18871682	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	18298362	shares
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CY2020	us-gaap	Net Income Loss NetIncomeLoss	-446899000	USD
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CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	-60647000	USD
CY2021	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	0	USD
CY2020	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	0	USD
CY2021	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	47461000	USD
CY2020	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	-60647000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-6021000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-7278000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	0	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	0	USD
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-6021000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-7278000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	53482000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-53369000	USD
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	342272000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-500268000	USD
CY2021Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	81211000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	139227000	USD
CY2021Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	393000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	293000	USD
CY2021Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	489241000	USD
CY2020Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	145670000	USD
CY2021Q4	us-gaap	Inventory Net InventoryNet	129382000	USD
CY2020Q4	us-gaap	Inventory Net InventoryNet	108051000	USD
CY2021Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	47690000	USD
CY2020Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	106252000	USD
CY2021Q4	us-gaap	Assets Of Disposal Group Including Discontinued Operation Current AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent	462000	USD
CY2020Q4	us-gaap	Assets Of Disposal Group Including Discontinued Operation Current AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent	10935000	USD
CY2021Q4	us-gaap	Assets Current AssetsCurrent	747986000	USD
CY2020Q4	us-gaap	Assets Current AssetsCurrent	510135000	USD
CY2021Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization	443856000	USD
CY2020Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization	382423000	USD
CY2021Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	362218000	USD
CY2020Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	363620000	USD
CY2021Q4	us-gaap	Mineral Properties Accumulated Depletion MineralPropertiesAccumulatedDepletion	52444000	USD
CY2020Q4	us-gaap	Mineral Properties Accumulated Depletion MineralPropertiesAccumulatedDepletion	35143000	USD
CY2021Q4	us-gaap	Mineral Rights MineralRights	444302000	USD
CY2020Q4	us-gaap	Mineral Rights MineralRights	463250000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	34221000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	25700000	USD
CY2021Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	74197000	USD
CY2020Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	88196000	USD
CY2021Q4	us-gaap	Restricted Cash Noncurrent RestrictedCashNoncurrent	89426000	USD
CY2020Q4	us-gaap	Restricted Cash Noncurrent RestrictedCashNoncurrent	96033000	USD
CY2021Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	131057000	USD
CY2020Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	149382000	USD
CY2021Q4	us-gaap	Disposal Group Including Discontinued Operation Assets Noncurrent DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent	8526000	USD
CY2020Q4	us-gaap	Disposal Group Including Discontinued Operation Assets Noncurrent DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent	9473000	USD
CY2021Q4	us-gaap	Assets Assets	1857712000	USD
CY2020Q4	us-gaap	Assets Assets	1680089000	USD
CY2021Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	2989000	USD
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	28830000	USD
CY2021Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	90090000	USD
CY2020Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	58413000	USD
CY2021Q4	amr	Acquisition Related Obligations Carrying Amount Current AcquisitionRelatedObligationsCarryingAmountCurrent	22405000	USD
CY2020Q4	amr	Acquisition Related Obligations Carrying Amount Current AcquisitionRelatedObligationsCarryingAmountCurrent	19099000	USD
CY2021Q4	amr	Accrued Liabilitiesand Other Liabilities Current AccruedLiabilitiesandOtherLiabilitiesCurrent	174607000	USD
CY2020Q4	amr	Accrued Liabilitiesand Other Liabilities Current AccruedLiabilitiesandOtherLiabilitiesCurrent	140406000	USD
CY2021Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Current LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent	5838000	USD
CY2020Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Current LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent	12306000	USD
CY2021Q4	us-gaap	Liabilities Current LiabilitiesCurrent	295929000	USD
CY2020Q4	us-gaap	Liabilities Current LiabilitiesCurrent	259054000	USD
CY2021Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	445562000	USD
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	553697000	USD
CY2021Q4	amr	Acquisition Related Obligations Carrying Amount Noncurrent AcquisitionRelatedObligationsCarryingAmountNoncurrent	19000000	USD
CY2020Q4	amr	Acquisition Related Obligations Carrying Amount Noncurrent AcquisitionRelatedObligationsCarryingAmountNoncurrent	20768000	USD
CY2021Q4	amr	Liability Defined Benefit Plan Postretirement Black Lung Health Coverageand Workers Compensation Noncurrent LiabilityDefinedBenefitPlanPostretirementBlackLungHealthCoverageandWorkersCompensationNoncurrent	208193000	USD
CY2020Q4	amr	Liability Defined Benefit Plan Postretirement Black Lung Health Coverageand Workers Compensation Noncurrent LiabilityDefinedBenefitPlanPostretirementBlackLungHealthCoverageandWorkersCompensationNoncurrent	230081000	USD
CY2021Q4	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	159930000	USD
CY2020Q4	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	218671000	USD
CY2021Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	132013000	USD
CY2020Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	140074000	USD
CY2021Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	317000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	480000	USD
CY2021Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	26176000	USD
CY2020Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	28072000	USD
CY2021Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Noncurrent LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent	23683000	USD
CY2020Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Noncurrent LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent	29090000	USD
CY2021Q4	us-gaap	Liabilities Liabilities	1310803000	USD
CY2020Q4	us-gaap	Liabilities Liabilities	1479987000	USD
CY2021Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2020Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2021Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2020Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2020Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000.0	shares
CY2021Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000.0	shares
CY2020Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2021Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2021Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2020Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2020Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2021Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2021Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	50000000.0	shares
CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	50000000.0	shares
CY2021Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	20800000	shares
CY2021Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	18400000	shares
CY2020Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	20600000	shares
CY2020Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	18300000	shares
CY2021Q4	us-gaap	Common Stock Value CommonStockValue	208000	USD
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	206000	USD
CY2021Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	784743000	USD
CY2020Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	779424000	USD
CY2021Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-58503000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-111985000	USD
CY2021Q4	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	2400000	shares
CY2020Q4	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	2300000	shares
CY2021Q4	us-gaap	Treasury Stock Value TreasuryStockValue	107800000	USD
CY2020Q4	us-gaap	Treasury Stock Value TreasuryStockValue	107014000	USD
CY2021Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-71739000	USD
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-360529000	USD
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	546909000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	200102000	USD
CY2021Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1857712000	USD
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1680089000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	288790000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	-446899000	USD
CY2021	amr	Depreciation Depletion And Amortization Excluding Acquired Intangibles Including Discontinued Operations DepreciationDepletionAndAmortizationExcludingAcquiredIntangiblesIncludingDiscontinuedOperations	110047000	USD
CY2020	amr	Depreciation Depletion And Amortization Excluding Acquired Intangibles Including Discontinued Operations DepreciationDepletionAndAmortizationExcludingAcquiredIntangiblesIncludingDiscontinuedOperations	151455000	USD
CY2021	amr	Amortization Of Intangibles Including Discontinued Operations AmortizationOfIntangiblesIncludingDiscontinuedOperations	13244000	USD
CY2020	amr	Amortization Of Intangibles Including Discontinued Operations AmortizationOfIntangiblesIncludingDiscontinuedOperations	10075000	USD
CY2021	amr	Acquisition Related Obligations Discount Accretion Expense AcquisitionRelatedObligationsDiscountAccretionExpense	-1258000	USD
CY2020	amr	Acquisition Related Obligations Discount Accretion Expense AcquisitionRelatedObligationsDiscountAccretionExpense	-3342000	USD
CY2021	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	12338000	USD
CY2020	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	14772000	USD
CY2021	amr	Acquisition Related Obligations Changesin Fair Value Gain Loss AcquisitionRelatedObligationsChangesinFairValueGainLoss	-19525000	USD
CY2020	amr	Acquisition Related Obligations Changesin Fair Value Gain Loss AcquisitionRelatedObligationsChangesinFairValueGainLoss	8750000	USD
CY2021	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	0	USD
CY2020	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	-36113000	USD
CY2021	amr	Gain Losson Dispositionof Assets Including Costof Sales GainLossonDispositionofAssetsIncludingCostofSales	9911000	USD
CY2020	amr	Gain Losson Dispositionof Assets Including Costof Sales GainLossonDispositionofAssetsIncludingCostofSales	2401000	USD
CY2021	amr	Asset Retirement Obligation Accretion Expense Including Adjustmentfor Liabilities Heldfor Saleand Discontinued Operations AssetRetirementObligationAccretionExpenseIncludingAdjustmentforLiabilitiesHeldforSaleandDiscontinuedOperations	26520000	USD
CY2020	amr	Asset Retirement Obligation Accretion Expense Including Adjustmentfor Liabilities Heldfor Saleand Discontinued Operations AssetRetirementObligationAccretionExpenseIncludingAdjustmentforLiabilitiesHeldforSaleandDiscontinuedOperations	30658000	USD
CY2021	us-gaap	Increase Decrease In Pension And Postretirement Obligations IncreaseDecreaseInPensionAndPostretirementObligations	-1751000	USD
CY2020	us-gaap	Increase Decrease In Pension And Postretirement Obligations IncreaseDecreaseInPensionAndPostretirementObligations	14439000	USD
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-163000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	33123000	USD
CY2021	amr	Restructuringand Asset Impairment Charges Including Discontinued Operations RestructuringandAssetImpairmentChargesIncludingDiscontinuedOperations	-561000	USD
CY2020	amr	Restructuringand Asset Impairment Charges Including Discontinued Operations RestructuringandAssetImpairmentChargesIncludingDiscontinuedOperations	256518000	USD
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	5315000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	4896000	USD
CY2021	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-4149000	USD
CY2020	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-3473000	USD
CY2021	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-6570000	USD
CY2020	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-5972000	USD
CY2021	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	336240000	USD
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-91190000	USD
CY2021	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	21331000	USD
CY2020	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-48689000	USD
CY2021	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-61581000	USD
CY2020	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-28152000	USD
CY2021	us-gaap	Increase Decrease In Deposit Other Assets IncreaseDecreaseInDepositOtherAssets	-26853000	USD
CY2020	us-gaap	Increase Decrease In Deposit Other Assets IncreaseDecreaseInDepositOtherAssets	17926000	USD
CY2021	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	250000	USD
CY2020	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	6753000	USD
CY2021	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	25154000	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-28620000	USD
CY2021	us-gaap	Increase Decrease In Other Accounts Payable And Accrued Liabilities IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities	15961000	USD
CY2020	us-gaap	Increase Decrease In Other Accounts Payable And Accrued Liabilities IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities	15428000	USD
CY2021	amr	Increase Decreasein Acquisition Related Obligations IncreaseDecreaseinAcquisitionRelatedObligations	18121000	USD
CY2020	amr	Increase Decreasein Acquisition Related Obligations IncreaseDecreaseinAcquisitionRelatedObligations	32560000	USD
CY2021	us-gaap	Increase Decrease In Asset Retirement Obligations IncreaseDecreaseInAssetRetirementObligations	-16306000	USD
CY2020	us-gaap	Increase Decrease In Asset Retirement Obligations IncreaseDecreaseInAssetRetirementObligations	-19375000	USD
CY2021	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	-24588000	USD
CY2020	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	-43831000	USD
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	174943000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	129236000	USD
CY2021	amr	Paymentsto Acquire Productive Assets Including Discontinued Operations PaymentstoAcquireProductiveAssetsIncludingDiscontinuedOperations	83300000	USD
CY2020	amr	Paymentsto Acquire Productive Assets Including Discontinued Operations PaymentstoAcquireProductiveAssetsIncludingDiscontinuedOperations	153990000	USD
CY2021	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	8224000	USD
CY2020	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	4023000	USD
CY2021	amr	Cash Paid On Sale Of Business CashPaidOnSaleOfBusiness	0	USD
CY2020	amr	Cash Paid On Sale Of Business CashPaidOnSaleOfBusiness	52192000	USD
CY2021	amr	Payments To Acquire Equity Method Investments Capital Contributions PaymentsToAcquireEquityMethodInvestmentsCapitalContributions	6677000	USD
CY2020	amr	Payments To Acquire Equity Method Investments Capital Contributions PaymentsToAcquireEquityMethodInvestmentsCapitalContributions	3443000	USD
CY2021	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	17985000	USD
CY2020	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	21129000	USD
CY2021	us-gaap	Proceeds From Sale Maturity And Collections Of Investments ProceedsFromSaleMaturityAndCollectionsOfInvestments	13265000	USD
CY2020	us-gaap	Proceeds From Sale Maturity And Collections Of Investments ProceedsFromSaleMaturityAndCollectionsOfInvestments	16685000	USD
CY2021	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	3382000	USD
CY2020	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-77000	USD
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-89855000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-209969000	USD
CY2021	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2020	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	57500000	USD
CY2021	amr	Repurchases Of Long Term Debt RepurchasesOfLongTermDebt	18415000	USD
CY2020	amr	Repurchases Of Long Term Debt RepurchasesOfLongTermDebt	0	USD
CY2021	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	119097000	USD
CY2020	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	76491000	USD
CY2021	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	2064000	USD
CY2020	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	3176000	USD
CY2021	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	6683000	USD
CY2020	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
CY2021	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	786000	USD
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	209000	USD
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-147045000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-22376000	USD
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-61957000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-103109000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	244571000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	347680000	USD
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	182614000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	244571000	USD
CY2021	us-gaap	Interest Paid Net InterestPaidNet	63061000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	49294000	USD
CY2021	us-gaap	Income Taxes Paid IncomeTaxesPaid	176000	USD
CY2020	us-gaap	Income Taxes Paid IncomeTaxesPaid	5000	USD
CY2021	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	64498000	USD
CY2020	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	68801000	USD
CY2021	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	787000	USD
CY2020	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	4411000	USD
CY2021	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	9964000	USD
CY2020	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	7493000	USD
CY2021Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	81211000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	139227000	USD
CY2021Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	11977000	USD
CY2020Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	9311000	USD
CY2021Q4	us-gaap	Restricted Cash Noncurrent RestrictedCashNoncurrent	89426000	USD
CY2020Q4	us-gaap	Restricted Cash Noncurrent RestrictedCashNoncurrent	96033000	USD
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	182614000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	244571000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	696122000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	-446899000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-53369000	USD
CY2020	amr	Stock Issued During Period Value Sharebased Compensation Including Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period StockIssuedDuringPeriodValueSharebasedCompensationIncludingAdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriod	3718000	USD
CY2020	amr	Treasury Stock Value Acquired Reissued And Related Expenses TreasuryStockValueAcquiredReissuedAndRelatedExpenses	970000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	200102000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	288790000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	53482000	USD
CY2021	amr	Stock Issued During Period Value Sharebased Compensation Including Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period StockIssuedDuringPeriodValueSharebasedCompensationIncludingAdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriod	5315000	USD
CY2021	amr	Treasury Stock Value Acquired Reissued And Related Expenses TreasuryStockValueAcquiredReissuedAndRelatedExpenses	-786000	USD
CY2021	amr	Stock Issued During Period Value Warrants Exercised StockIssuedDuringPeriodValueWarrantsExercised	6000	USD
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	546909000	USD
CY2021	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	ReclassificationsCertain amounts in the prior year Consolidated Statements of Cash Flows have been reclassified to conform to the current year presentation.
CY2021	us-gaap	Use Of Estimates UseOfEstimates	<div><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:115%">Use of Estimates</span></div><div><span><br/></span></div><div style="text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The preparation of the Company’s Consolidated Financial Statements requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the Consolidated Financial Statements and the reported amounts of revenues and expenses during the reporting period. Significant items subject to such estimates and assumptions include inventories; mineral reserves and resources; long-lived asset impairments; reclamation obligations; post-employment and other employee benefit obligations; useful lives, depletion and amortization; reserves for workers’ compensation and black lung claims; deferred income taxes; income taxes refundable and receivable; reserves for contingencies and litigation; fair value of financial instruments; and fair value adjustments for acquisition accounting. Estimates are based on facts and circumstances believed to be reasonable at the time; however, actual results could differ from those estimates.</span></div>
CY2021Q4	us-gaap	Mineral Rights MineralRights	444302000	USD
CY2020Q4	us-gaap	Mineral Rights MineralRights	463250000	USD
CY2021Q4	amr	Asset Retirement Obligation Assets AssetRetirementObligationAssets	10354000	USD
CY2020Q4	amr	Asset Retirement Obligation Assets AssetRetirementObligationAssets	10491000	USD
CY2021	us-gaap	Depletion Depletion	23541000	USD
CY2020	us-gaap	Depletion Depletion	-13746000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	74197000	USD
CY2021Q4	amr	Finite Lived Intangible Liabilities Gross FiniteLivedIntangibleLiabilitiesGross	0	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	74197000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	88196000	USD
CY2020Q4	amr	Finite Lived Intangible Liabilities Gross FiniteLivedIntangibleLiabilitiesGross	327000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	87869000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	11749000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	8079000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	6728000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	6723000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	6196000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	34722000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	74197000	USD
CY2021Q4	us-gaap	Workers Compensation Discount Amount WorkersCompensationDiscountAmount	23442000	USD
CY2020Q4	us-gaap	Workers Compensation Discount Amount WorkersCompensationDiscountAmount	24061000	USD
CY2016Q3	us-gaap	Class Of Warrant Or Right Outstanding ClassOfWarrantOrRightOutstanding	810811	shares
CY2016Q3	us-gaap	Class Of Warrant Or Right Exercise Price Of Warrants Or Rights1 ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1	55.93
CY2016Q3	us-gaap	Class Of Warrant Or Right Number Of Securities Called By Each Warrant Or Right ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight	1	shares
CY2016Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2021Q4	us-gaap	Class Of Warrant Or Right Exercise Price Of Warrants Or Rights1 ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1	46.911
CY2020Q4	us-gaap	Class Of Warrant Or Right Exercise Price Of Warrants Or Rights1 ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1	46.911
CY2020Q4	us-gaap	Class Of Warrant Or Right Number Of Securities Called By Each Warrant Or Right ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight	1.15	shares
CY2021Q4	us-gaap	Class Of Warrant Or Right Number Of Securities Called By Each Warrant Or Right ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight	1.15	shares
CY2016Q3	us-gaap	Class Of Warrant Or Right Outstanding ClassOfWarrantOrRightOutstanding	810811	shares
CY2021Q4	us-gaap	Class Of Warrant Or Right Outstanding ClassOfWarrantOrRightOutstanding	801246	shares
CY2021Q4	us-gaap	Class Of Warrant Or Right Number Of Securities Called By Warrants Or Rights ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights	921433	shares
CY2021	amr	Stock Issued During Period Shares Exercise Of Warrants StockIssuedDuringPeriodSharesExerciseOfWarrants	143	shares
CY2021	amr	Shares Withheld Upon Conversionof Convertible Securities SharesWithheldUponConversionofConvertibleSecurities	17	shares
CY2016Q3	us-gaap	Class Of Warrant Or Right Outstanding ClassOfWarrantOrRightOutstanding	810811	shares
CY2020Q4	us-gaap	Class Of Warrant Or Right Outstanding ClassOfWarrantOrRightOutstanding	801370	shares
CY2020Q4	us-gaap	Class Of Warrant Or Right Number Of Securities Called By Warrants Or Rights ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights	921576	shares
CY2021Q4	us-gaap	Equity Method Investments EquityMethodInvestments	20460000	USD
CY2020Q4	us-gaap	Equity Method Investments EquityMethodInvestments	18383000	USD
CY2021	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1	segment
CY2021	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1	segment
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2252597000	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1413124000	USD
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	65768000	USD
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	14199000	USD
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	0	USD
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	0	USD
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	0	USD
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	79967000	USD
CY2021	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	717992	shares
CY2020	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1317351	shares
CY2020	amr	Weighted Average Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount WeightedAverageAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	142250	shares
CY2021	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	286929000	USD
CY2020	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-241470000	USD
CY2021	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	1861000	USD
CY2020	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-205429000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	288790000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	-446899000	USD
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	18441175	shares
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	18298362	shares
CY2021	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	15.56
CY2020	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-13.20
CY2021	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	0.10
CY2020	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	-11.22
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	15.66
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-24.42
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	18441175	shares
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	18298362	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	18871682	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	18298362	shares
CY2021	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	15.20
CY2020	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-13.20
CY2021	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare	0.10
CY2020	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare	-11.22
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	15.30
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-24.42
CY2021Q4	us-gaap	Inventory Net InventoryNet	129382000	USD
CY2020Q4	us-gaap	Inventory Net InventoryNet	108051000	USD
CY2020	us-gaap	Inventory Write Down InventoryWriteDown	807000	USD
CY2020Q1	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	33709000	USD
CY2020Q2	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	17390000	USD
CY2020Q3	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	219000	USD
CY2020Q4	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	29636000	USD
CY2020	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	80954000	USD
CY2020Q1	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	0	USD
CY2020Q2	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	144348000	USD
CY2020Q3	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	3297000	USD
CY2020Q4	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	0	USD
CY2020	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	147645000	USD
CY2020Q1	us-gaap	Tangible Asset Impairment Charges TangibleAssetImpairmentCharges	33709000	USD
CY2020Q2	us-gaap	Tangible Asset Impairment Charges TangibleAssetImpairmentCharges	161738000	USD
CY2020Q3	us-gaap	Tangible Asset Impairment Charges TangibleAssetImpairmentCharges	3516000	USD
CY2020Q4	us-gaap	Tangible Asset Impairment Charges TangibleAssetImpairmentCharges	29636000	USD
CY2020	us-gaap	Tangible Asset Impairment Charges TangibleAssetImpairmentCharges	228599000	USD
CY2020Q1	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	33709000	USD
CY2020Q2	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	17390000	USD
CY2020Q3	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	219000	USD
CY2020Q4	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	29636000	USD
CY2020	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	80954000	USD
CY2020Q1	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	0	USD
CY2020Q2	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	144348000	USD
CY2020Q3	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	3297000	USD
CY2020Q4	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	0	USD
CY2020	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	147645000	USD
CY2020Q1	us-gaap	Tangible Asset Impairment Charges TangibleAssetImpairmentCharges	33709000	USD
CY2020Q2	us-gaap	Tangible Asset Impairment Charges TangibleAssetImpairmentCharges	161738000	USD
CY2020Q3	us-gaap	Tangible Asset Impairment Charges TangibleAssetImpairmentCharges	3516000	USD
CY2020Q4	us-gaap	Tangible Asset Impairment Charges TangibleAssetImpairmentCharges	29636000	USD
CY2020	us-gaap	Tangible Asset Impairment Charges TangibleAssetImpairmentCharges	228599000	USD
CY2021Q4	amr	Prepaid Freight PrepaidFreight	19671000	USD
CY2020Q4	amr	Prepaid Freight PrepaidFreight	8515000	USD
CY2021Q4	us-gaap	Other Receivables Net Current OtherReceivablesNetCurrent	4161000	USD
CY2020Q4	us-gaap	Other Receivables Net Current OtherReceivablesNetCurrent	13245000	USD
CY2021Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	11977000	USD
CY2020Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	9311000	USD
CY2021Q4	us-gaap	Prepaid Insurance PrepaidInsurance	8525000	USD
CY2020Q4	us-gaap	Prepaid Insurance PrepaidInsurance	6510000	USD
CY2021Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	0	USD
CY2020Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	64565000	USD
CY2021Q4	amr	Prepaid Bond Premium PrepaidBondPremium	1649000	USD
CY2020Q4	amr	Prepaid Bond Premium PrepaidBondPremium	2576000	USD
CY2021Q4	us-gaap	Other Prepaid Expense Current OtherPrepaidExpenseCurrent	1707000	USD
CY2020Q4	us-gaap	Other Prepaid Expense Current OtherPrepaidExpenseCurrent	1530000	USD
CY2021Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	47690000	USD
CY2020Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	106252000	USD
CY2021Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Before Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization	806074000	USD
CY2020Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Before Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization	746043000	USD
CY2021Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization	443856000	USD
CY2020Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization	382423000	USD
CY2021Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	362218000	USD
CY2020Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	363620000	USD
CY2021	amr	Depreciation And Amortization Property Plant And Equipment And Non Mineral Asset Retirement Obligation Assets DepreciationAndAmortizationPropertyPlantAndEquipmentAndNonMineralAssetRetirementObligationAssets	86506000	USD
CY2020	amr	Depreciation And Amortization Property Plant And Equipment And Non Mineral Asset Retirement Obligation Assets DepreciationAndAmortizationPropertyPlantAndEquipmentAndNonMineralAssetRetirementObligationAssets	153631000	USD
CY2021Q4	us-gaap	Prepaid Mineral Royalties Noncurrent PrepaidMineralRoyaltiesNoncurrent	10788000	USD
CY2020Q4	us-gaap	Prepaid Mineral Royalties Noncurrent PrepaidMineralRoyaltiesNoncurrent	13132000	USD
CY2021Q4	us-gaap	Deposits Assets Noncurrent DepositsAssetsNoncurrent	1371000	USD
CY2020Q4	us-gaap	Deposits Assets Noncurrent DepositsAssetsNoncurrent	28200000	USD
CY2021Q4	us-gaap	Restricted Investments Noncurrent RestrictedInvestmentsNoncurrent	28443000	USD
CY2020Q4	us-gaap	Restricted Investments Noncurrent RestrictedInvestmentsNoncurrent	23768000	USD
CY2021Q4	us-gaap	Equity Method Investments EquityMethodInvestments	20460000	USD
CY2020Q4	us-gaap	Equity Method Investments EquityMethodInvestments	18383000	USD
CY2021Q4	amr	Insurance Receivablefor Workers Compensation Noncurrent InsuranceReceivableforWorkersCompensationNoncurrent	45335000	USD
CY2020Q4	amr	Insurance Receivablefor Workers Compensation Noncurrent InsuranceReceivableforWorkersCompensationNoncurrent	48320000	USD
CY2021Q4	us-gaap	Other Assets Miscellaneous Noncurrent OtherAssetsMiscellaneousNoncurrent	24660000	USD
CY2020Q4	us-gaap	Other Assets Miscellaneous Noncurrent OtherAssetsMiscellaneousNoncurrent	17579000	USD
CY2021Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	131057000	USD
CY2020Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	149382000	USD
CY2021Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	2987000	USD
CY2020Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	4262000	USD
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	5003000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	5671000	USD
CY2021Q4	amr	Lease Rightof Use Asset LeaseRightofUseAsset	7990000	USD
CY2020Q4	amr	Lease Rightof Use Asset LeaseRightofUseAsset	9933000	USD
CY2021Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	1878000	USD
CY2020Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	2014000	USD
CY2021Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	547000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	595000	USD
CY2021Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	791000	USD
CY2020Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	1996000	USD
CY2021Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	4456000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	5076000	USD
CY2021Q4	amr	Lease Liability LeaseLiability	7672000	USD
CY2020Q4	amr	Lease Liability LeaseLiability	9681000	USD
CY2021	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	2061000	USD
CY2020	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	3238000	USD
CY2021	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	245000	USD
CY2020	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	358000	USD
CY2021	us-gaap	Operating Lease Cost OperatingLeaseCost	1383000	USD
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	2105000	USD
CY2021	us-gaap	Short Term Lease Cost ShortTermLeaseCost	786000	USD
CY2020	us-gaap	Short Term Lease Cost ShortTermLeaseCost	1518000	USD
CY2021	us-gaap	Lease Cost LeaseCost	4475000	USD
CY2020	us-gaap	Lease Cost LeaseCost	7219000	USD
CY2021	us-gaap	Sublease Income SubleaseIncome	0	USD
CY2020	us-gaap	Sublease Income SubleaseIncome	0	USD
CY2020	us-gaap	Variable Lease Cost VariableLeaseCost	0	USD
CY2021	us-gaap	Variable Lease Cost VariableLeaseCost	0	USD
CY2021	amr	Lease Payments LeasePayments	4478000	USD
CY2020	amr	Lease Payments LeasePayments	7157000	USD
CY2021	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	245000	USD
CY2020	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	358000	USD
CY2021	us-gaap	Operating Lease Payments OperatingLeasePayments	2169000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	3623000	USD
CY2021	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	2064000	USD
CY2020	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	3176000	USD
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	703000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	221000	USD
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	275000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	-12000	USD
CY2021Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P1Y9M
CY2020Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P1Y11M8D
CY2021Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P7Y10M17D
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P8Y5M12D
CY2021Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.096
CY2020Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.061
CY2021Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.113
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.115
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	2072000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	1100000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	522000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	1066000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	259000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	955000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	150000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	897000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	3000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	884000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	0	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	2775000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	3006000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	7677000	USD
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CY2021Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	2669000	USD
CY2021Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	5003000	USD
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CY2021Q4	us-gaap	Workers Compensation Liability Current WorkersCompensationLiabilityCurrent	10582000	USD
CY2020Q4	us-gaap	Workers Compensation Liability Current WorkersCompensationLiabilityCurrent	10355000	USD
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CY2021Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	32159000	USD
CY2020Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	24990000	USD
CY2021Q4	amr	Accrued Interest And Fees AccruedInterestAndFees	14489000	USD
CY2020Q4	amr	Accrued Interest And Fees AccruedInterestAndFees	15902000	USD
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CY2020Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	13197000	USD
CY2021Q4	amr	Accrued Freight AccruedFreight	15085000	USD
CY2020Q4	amr	Accrued Freight AccruedFreight	2610000	USD
CY2021Q4	amr	Other Liabilities Miscellaneous Current OtherLiabilitiesMiscellaneousCurrent	12013000	USD
CY2020Q4	amr	Other Liabilities Miscellaneous Current OtherLiabilitiesMiscellaneousCurrent	4698000	USD
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CY2020Q4	amr	Accrued Liabilitiesand Other Liabilities Current AccruedLiabilitiesandOtherLiabilitiesCurrent	140406000	USD
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CY2020Q4	us-gaap	Debt Instrument Unamortized Discount Premium And Debt Issuance Costs Net DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet	17046000	USD
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CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations Including Current Maturities LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities	582527000	USD
CY2021Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	2989000	USD
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	28830000	USD
CY2021Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	445562000	USD
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	553697000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	2989000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	1367000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	450245000	USD
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CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	3000	USD
CY2021Q4	us-gaap	Long Term Debt LongTermDebt	454746000	USD
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CY2020Q4	amr	Acquisition Related Obligations Discount Premium AcquisitionRelatedObligationsDiscountPremium	1491000	USD
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CY2020Q4	amr	Acquisition Related Obligations Carrying Amount AcquisitionRelatedObligationsCarryingAmount	39867000	USD
CY2021Q4	amr	Acquisition Related Obligations Carrying Amount Current AcquisitionRelatedObligationsCarryingAmountCurrent	22405000	USD
CY2020Q4	amr	Acquisition Related Obligations Carrying Amount Current AcquisitionRelatedObligationsCarryingAmountCurrent	19099000	USD
CY2021Q4	amr	Acquisition Related Obligations Carrying Amount Noncurrent AcquisitionRelatedObligationsCarryingAmountNoncurrent	19000000	USD
CY2020Q4	amr	Acquisition Related Obligations Carrying Amount Noncurrent AcquisitionRelatedObligationsCarryingAmountNoncurrent	20768000	USD
CY2019Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	203137000	USD
CY2020	amr	Asset Retirement Obligation Accretion Expense Excluding Liabilities Heldfor Sale AssetRetirementObligationAccretionExpenseExcludingLiabilitiesHeldforSale	26504000	USD
CY2020	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	621000	USD
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CY2020	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	21433000	USD
CY2020Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	165064000	USD
CY2021	amr	Asset Retirement Obligation Accretion Expense Excluding Liabilities Heldfor Sale AssetRetirementObligationAccretionExpenseExcludingLiabilitiesHeldforSale	26520000	USD
CY2021	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	2125000	USD
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CY2021	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	16793000	USD
CY2021Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	164172000	USD
CY2021Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	32159000	USD
CY2021Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	132013000	USD
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CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3609000	USD
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CY2020	us-gaap	Income Tax Expense Benefit Intraperiod Tax Allocation IncomeTaxExpenseBenefitIntraperiodTaxAllocation	-2164000	USD
CY2021	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	2586000	USD
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-35187000	USD
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CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-2164000	USD
CY2021	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	61013000	USD
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CY2021Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	172883000	USD
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CY2020	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-9640000	USD
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CY2020	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	59929000	USD
CY2021	amr	Effective Income Tax Rate Reconciliation Capital Loss Expiration EffectiveIncomeTaxRateReconciliationCapitalLossExpiration	10552000	USD
CY2020	amr	Effective Income Tax Rate Reconciliation Capital Loss Expiration EffectiveIncomeTaxRateReconciliationCapitalLossExpiration	0	USD
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CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	1739000	USD
CY2021	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-190000	USD
CY2020	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	2368000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3609000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-2164000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Asset Retirement Obligations DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations	36252000	USD
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CY2021Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	187341000	USD
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CY2021Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	7100000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	10976000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	333366000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	444275000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	160483000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	180888000	USD
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CY2020Q4	us-gaap	Deferred Tax Liabilities Prepaid Expenses DeferredTaxLiabilitiesPrepaidExpenses	6211000	USD
CY2021Q4	amr	Deferred Tax Liabilities Restricted Cash DeferredTaxLiabilitiesRestrictedCash	5362000	USD
CY2020Q4	amr	Deferred Tax Liabilities Restricted Cash DeferredTaxLiabilitiesRestrictedCash	11516000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	0	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	55000	USD
CY2021Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	160800000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	181368000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	317000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	480000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	263387000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	133020000	USD
CY2021	amr	Valuation Allowance Deferred Tax Asset Increase Decrease Recognizedin Income Tax Expense Amount ValuationAllowanceDeferredTaxAssetIncreaseDecreaseRecognizedinIncomeTaxExpenseAmount	-78043000	USD
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CY2021	amr	Valuation Allowance Deferred Tax Asset Increase Decrease Not Recognizedin Income Tax Expense Amount ValuationAllowanceDeferredTaxAssetIncreaseDecreaseNotRecognizedinIncomeTaxExpenseAmount	-12461000	USD
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CY2021Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	172883000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	263387000	USD
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CY2021Q4	us-gaap	Decrease In Unrecognized Tax Benefits Is Reasonably Possible DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible	20788000	USD
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CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	20788000	USD
CY2021	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	20788000	USD
CY2021Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	USD
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CY2021Q4	amr	Workers Compensation Liability Net WorkersCompensationLiabilityNet	84341000	USD
CY2020Q4	amr	Workers Compensation Liability Net WorkersCompensationLiabilityNet	97448000	USD
CY2021	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	10276000	USD
CY2020	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	3613000	USD
CY2021	amr	Medical Self Insurance Period Expense MedicalSelfInsurancePeriodExpense	63127000	USD
CY2020	amr	Medical Self Insurance Period Expense MedicalSelfInsurancePeriodExpense	52517000	USD
CY2021Q4	amr	Sharebased Compensation Arrangementby Sharebased Payment Award Numberof Award Types SharebasedCompensationArrangementbySharebasedPaymentAwardNumberofAwardTypes	4	award_type
CY2021	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	7468000	USD
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	5540000	USD
CY2021	us-gaap	Royalty Expense RoyaltyExpense	113685000	USD
CY2020	us-gaap	Royalty Expense RoyaltyExpense	67992000	USD
CY2021Q4	us-gaap	Restricted Cash RestrictedCash	101403000	USD
CY2020Q4	us-gaap	Restricted Cash RestrictedCash	105344000	USD
CY2021Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	11977000	USD
CY2020Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	9311000	USD
CY2021Q4	us-gaap	Restricted Cash Noncurrent RestrictedCashNoncurrent	89426000	USD
CY2020Q4	us-gaap	Restricted Cash Noncurrent RestrictedCashNoncurrent	96033000	USD
CY2021Q4	us-gaap	Restricted Investments RestrictedInvestments	28443000	USD
CY2020Q4	us-gaap	Restricted Investments RestrictedInvestments	23768000	USD
CY2021Q4	us-gaap	Debt Securities Trading Restricted DebtSecuritiesTradingRestricted	28443000	USD
CY2020Q4	us-gaap	Debt Securities Trading Restricted DebtSecuritiesTradingRestricted	22498000	USD
CY2021Q4	us-gaap	Held To Maturity Securities Restricted HeldToMaturitySecuritiesRestricted	0	USD
CY2020Q4	us-gaap	Held To Maturity Securities Restricted HeldToMaturitySecuritiesRestricted	1270000	USD
CY2021Q4	us-gaap	Deposit Assets DepositAssets	1394000	USD
CY2020Q4	us-gaap	Deposit Assets DepositAssets	28247000	USD
CY2021	us-gaap	Revenues Revenues	2258586000	USD
CY2020	us-gaap	Revenues Revenues	1416187000	USD
CY2021	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1	segment
CY2020	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	segment
CY2021	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1	segment
CY2021	us-gaap	Revenues Revenues	2258586000	USD
CY2021	amr	Depreciation Depletion And Amortization Excluding Acquired Intangibles DepreciationDepletionAndAmortizationExcludingAcquiredIntangibles	110047000	USD
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	13244000	USD
CY2021	amr	Adjusted Earnings Before Income Tax Interest Depreciation And Amortization AdjustedEarningsBeforeIncomeTaxInterestDepreciationAndAmortization	532823000	USD
CY2021	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	83300000	USD
CY2020	us-gaap	Revenues Revenues	1416187000	USD
CY2020	amr	Depreciation Depletion And Amortization Excluding Acquired Intangibles DepreciationDepletionAndAmortizationExcludingAcquiredIntangibles	139885000	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	9214000	USD
CY2020	amr	Adjusted Earnings Before Income Tax Interest Depreciation And Amortization AdjustedEarningsBeforeIncomeTaxInterestDepreciationAndAmortization	83401000	USD
CY2020	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	119579000	USD
CY2021	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	286929000	USD
CY2021	us-gaap	Interest Expense InterestExpense	69654000	USD
CY2021	us-gaap	Investment Income Interest InvestmentIncomeInterest	334000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3609000	USD
CY2021	amr	Depreciation Depletion And Amortization Excluding Acquired Intangibles DepreciationDepletionAndAmortizationExcludingAcquiredIntangibles	110047000	USD
CY2021	amr	Noncash Allocated Sharebased Compensation Expense NoncashAllocatedSharebasedCompensationExpense	5315000	USD
CY2021	amr	Acquisition Related Obligations Changesin Fair Value Gain Loss AcquisitionRelatedObligationsChangesinFairValueGainLoss	-19525000	USD
CY2021	amr	Gain Loss On Settlement Of Acquisition Related Obligations GainLossOnSettlementOfAcquisitionRelatedObligations	1125000	USD
CY2021	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	26520000	USD
CY2021	us-gaap	Restructuring Costs And Asset Impairment Charges RestructuringCostsAndAssetImpairmentCharges	-561000	USD
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	13244000	USD
CY2021	amr	Adjusted Earnings Before Income Tax Interest Depreciation And Amortization AdjustedEarningsBeforeIncomeTaxInterestDepreciationAndAmortization	532823000	USD
CY2020	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-241470000	USD
CY2020	us-gaap	Interest Expense InterestExpense	74528000	USD
CY2020	us-gaap	Investment Income Interest InvestmentIncomeInterest	7027000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-2164000	USD
CY2020	amr	Depreciation Depletion And Amortization Excluding Acquired Intangibles DepreciationDepletionAndAmortizationExcludingAcquiredIntangibles	139885000	USD
CY2020	amr	Noncash Allocated Sharebased Compensation Expense NoncashAllocatedSharebasedCompensationExpense	4896000	USD
CY2020	amr	Acquisition Related Obligations Changesin Fair Value Gain Loss AcquisitionRelatedObligationsChangesinFairValueGainLoss	8750000	USD
CY2020	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	26504000	USD
CY2020	us-gaap	Restructuring Costs And Asset Impairment Charges RestructuringCostsAndAssetImpairmentCharges	83878000	USD
CY2020	amr	Defined Benefit Planand Other Benefit Plan Settlement Gain Loss DefinedBenefitPlanandOtherBenefitPlanSettlementGainLoss	-2966000	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	9214000	USD
CY2020	amr	Adjusted Earnings Before Income Tax Interest Depreciation And Amortization AdjustedEarningsBeforeIncomeTaxInterestDepreciationAndAmortization	83401000	USD

Files In Submission

Name	View Source	Status
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0001704715-22-000012-index.html	Edgar Link	pending
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$AMR
Alpha Metallurgical Resources, Inc. Stock $amr

2021 Q4 Form 10-K Financial Statement

#000170471522000012 Filed on March 07, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AMR Alpha Metallurgical Resources, Inc. Stock $amr

2021 Q4 Form 10-K Financial Statement

#000170471522000012 Filed on March 07, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AMR
Alpha Metallurgical Resources, Inc. Stock $amr