$ARCH
ARCH RESOURCES, INC. Stock $arch

$arch Overview Financials Valuation SEC Filings Company Website

2024 Q1 Form 10-K Financial Statement

#000155837024001229 Filed on February 15, 2024

Income Statement

Concept	2024 Q1	2023 Q4	2023
Revenue	$680.2M	$774.0M	$3.146B
YoY Change	-21.81%	-9.94%	-15.54%
Cost Of Revenue	$567.7M	$567.2M	$2.342B
YoY Change	-0.7%	-2.35%	0.13%
Gross Profit	$58.17M	$206.8M	$546.5M
YoY Change	-75.41%	-25.77%	-50.74%
Gross Profit Margin	8.55%	26.72%	17.37%
Selling, General & Admin	$25.59M	$25.78M	$98.87M
YoY Change	-1.67%	-1.17%	-6.15%
% of Gross Profit	43.98%	12.46%	18.09%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$38.82M	$38.12M	$146.4M
YoY Change	9.42%	10.96%	9.84%
% of Gross Profit	66.73%	18.43%	26.79%
Operating Expenses	$25.59M	$70.02M	$98.87M
YoY Change	-1.67%	8.15%	-6.15%
Operating Profit	$59.96M	$136.8M	$548.9M
YoY Change	-74.57%	-36.04%	-49.93%
Interest Expense	$4.316M	$670.0K	$14.82M
YoY Change	4.6%	-83.96%	-27.56%
% of Operating Profit	7.2%	0.49%	2.7%
Other Income/Expense, Net	-$286.0K	-$1.906M	$2.660M
YoY Change	-46.44%	192.33%	-115.41%
Pretax Income	$59.67M	$135.6M	$551.6M
YoY Change	-74.63%	-37.56%	-48.93%
Income Tax	$3.719M	$20.68M	$87.51M
% Of Pretax Income	6.23%	15.25%	15.87%
Net Earnings	$55.95M	$114.9M	$464.0M
YoY Change	-71.76%	-75.58%	-65.13%
Net Earnings / Revenue	8.23%	14.84%	14.75%
Basic Earnings Per Share	$3.05		$25.45
Diluted Earnings Per Share	$2.98	$6.07	$24.20
COMMON SHARES
Basic Shares Outstanding	18.36M	18.37M	18.23M
Diluted Shares Outstanding	18.78M		19.18M

Balance Sheet

Concept	2024 Q1	2023 Q4	2023
SHORT-TERM ASSETS
Cash & Short-Term Investments	$319.8M	$320.5M	$320.5M
YoY Change	44.14%	17.39%	17.39%
Cash & Equivalents	$285.5M	$287.8M	$287.8M
Short-Term Investments	$34.25M	$32.72M	$32.72M
Other Short-Term Assets	$63.39M	$64.65M	$65.75M
YoY Change	15.07%	-9.43%	-9.29%
Inventory	$243.7M	$244.3M	$244.3M
Prepaid Expenses
Receivables	$224.1M	$273.5M	$273.5M
Other Receivables	$10.52M	$13.70M	$13.70M
Total Short-Term Assets	$862.6M	$917.8M	$917.8M
YoY Change	-0.04%	11.4%	11.4%
LONG-TERM ASSETS
Property, Plant & Equipment	$1.236B	$1.229B	$1.240B
YoY Change	4.52%	3.53%	3.17%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$24.05M	$22.82M	$22.82M
YoY Change	25.66%	32.13%	32.13%
Other Assets	$47.35M	$48.41M	$303.5M
YoY Change	-16.27%	-18.64%	-22.18%
Total Long-Term Assets	$1.572B	$1.566B	$1.566B
YoY Change	0.15%	-2.66%	-2.66%
TOTAL ASSETS
Total Short-Term Assets	$862.6M	$917.8M	$917.8M
Total Long-Term Assets	$1.572B	$1.566B	$1.566B
Total Assets	$2.435B	$2.484B	$2.484B
YoY Change	0.08%	2.1%	2.1%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$178.1M	$205.0M	$205.0M
YoY Change	0.66%	-3.23%	-3.23%
Accrued Expenses	$113.4M	$127.6M	$118.4M
YoY Change	-5.67%	-18.74%	-24.13%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$38.21M	$36.38M	$36.38M
YoY Change	-0.5%	-38.3%	-38.3%
Total Short-Term Liabilities	$326.8M	$368.0M	$368.0M
YoY Change	-2.31%	-13.8%	-13.8%
LONG-TERM LIABILITIES
Long-Term Debt	$108.0M	$105.3M	$107.3M
YoY Change	-2.65%	-9.49%	-10.11%
Other Long-Term Liabilities	$68.12M	$72.74M	$529.4M
YoY Change	-14.16%	-11.39%	1.57%
Total Long-Term Liabilities	$176.1M	$178.0M	$636.8M
YoY Change	-7.45%	-10.28%	-0.61%
TOTAL LIABILITIES
Total Short-Term Liabilities	$326.8M	$368.0M	$368.0M
Total Long-Term Liabilities	$176.1M	$178.0M	$636.8M
Total Liabilities	$967.2M	$1.005B	$1.005B
YoY Change	-0.15%	-5.88%	-5.88%
SHAREHOLDERS EQUITY
Retained Earnings	$1.855B	$1.830B
YoY Change	8.71%	16.91%
Common Stock	$754.4M	$720.3M
YoY Change	7.15%	-0.64%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$1.179B	$1.110B
YoY Change	17.27%	12.52%
Treasury Stock Shares
Shareholders Equity	$1.467B	$1.479B	$1.479B
YoY Change
Total Liabilities & Shareholders Equity	$2.435B	$2.484B	$2.484B
YoY Change	0.08%	2.1%	2.1%

Cashflow Statement

Concept	2024 Q1	2023 Q4	2023
OPERATING ACTIVITIES
Net Income	$55.95M	$114.9M	$464.0M
YoY Change	-71.76%	-75.58%	-65.13%
Depreciation, Depletion And Amortization	$38.82M	$38.12M	$146.4M
YoY Change	9.42%	10.96%	9.84%
Cash From Operating Activities	$128.3M	$181.6M	$635.4M
YoY Change	1.7%	-6.55%	-47.47%
INVESTING ACTIVITIES
Capital Expenditures	$45.45M	$55.11M	$176.0M
YoY Change	48.8%	-29.53%	1.92%
Acquisitions
YoY Change
Other Investing Activities	-$5.578M	-$4.610M	-$8.410M
YoY Change	-614.58%	-84.13%	-71.96%
Cash From Investing Activities	-$51.07M	-$59.62M	-$185.6M
YoY Change	72.72%	-44.41%	-8.92%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net			$125.5M
YoY Change			-19.95%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-79.47M	-17.20M	-398.0M
YoY Change	-44.38%	-94.96%	-63.65%
NET CHANGE
Cash From Operating Activities	128.3M	181.6M	635.4M
Cash From Investing Activities	-51.07M	-59.62M	-185.6M
Cash From Financing Activities	-79.47M	-17.20M	-398.0M
Net Change In Cash	-2.276M	104.7M	51.75M
YoY Change	-95.09%	-141.2%	-158.06%
FREE CASH FLOW
Cash From Operating Activities	$128.3M	$181.6M	$635.4M
Capital Expenditures	$45.45M	$55.11M	$176.0M
Free Cash Flow	$82.82M	$126.5M	$459.3M
YoY Change	-13.35%	8.93%	-55.7%

Facts In Submission

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CY2023	dei	Entity Central Index Key EntityCentralIndexKey	0001037676
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CY2023	arch	Long Term Contracts Life Term Minimum LongTermContractsLifeTermMinimum	P1Y
CY2023	dei	Amendment Flag AmendmentFlag	false
CY2023	dei	Document Type DocumentType	10-K
CY2023	dei	Document Annual Report DocumentAnnualReport	true
CY2023	dei	Document Period End Date DocumentPeriodEndDate	2023-12-31
CY2023	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2023	dei	Document Transition Report DocumentTransitionReport	false
CY2023	dei	Entity File Number EntityFileNumber	1-13105
CY2023	dei	Entity Registrant Name EntityRegistrantName	Arch Resources, Inc.
CY2023	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2023	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	43-0921172
CY2023	dei	Entity Address Address Line1 EntityAddressAddressLine1	1 CityPlace Drive
CY2023	dei	Entity Address Address Line2 EntityAddressAddressLine2	Suite 300
CY2023	dei	Entity Address City Or Town EntityAddressCityOrTown	St. Louis
CY2023	dei	Entity Address State Or Province EntityAddressStateOrProvince	MO
CY2023	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	63141
CY2023	dei	City Area Code CityAreaCode	314
CY2023	dei	Local Phone Number LocalPhoneNumber	994-2700
CY2023	dei	Security12b Title Security12bTitle	Common Stock, $.01 par value
CY2023	dei	Trading Symbol TradingSymbol	ARCH
CY2023	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2023	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2023	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2023	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2023	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2023	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2023	dei	Entity Small Business EntitySmallBusiness	false
CY2023	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2023	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2023	dei	Document Fin Stmt Error Correction Flag DocumentFinStmtErrorCorrectionFlag	false
CY2023	dei	Entity Shell Company EntityShellCompany	false
CY2023Q2	dei	Entity Public Float EntityPublicFloat	2052100000
CY2024Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	18360691
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CY2023Q4	ecd	Rule10b51 Arr Trmntd Flag Rule10b51ArrTrmntdFlag	false
CY2023	dei	Auditor Firm AuditorFirmId	42
CY2023	dei	Auditor Name AuditorName	Ernst & Young LLP
CY2023	dei	Auditor Location AuditorLocation	St. Louis, Missouri
CY2023	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3145843000
CY2022	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3724593000
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2208042000
CY2023	us-gaap	Cost Of Goods And Service Excluding Depreciation Depletion And Amortization CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization	2341956000
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CY2022	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	17721000
CY2021	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	21748000
CY2023	arch	Change In Fair Value Of Coal Derivatives Net ChangeInFairValueOfCoalDerivativesNet	1572000
CY2022	arch	Change In Fair Value Of Coal Derivatives Net ChangeInFairValueOfCoalDerivativesNet	1274000
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CY2022	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	105355000
CY2021	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	92342000
CY2021	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	-24225000
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CY2021	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	-4826000
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CY2022	us-gaap	Gross Profit GrossProfit	1109411000
CY2021	us-gaap	Gross Profit GrossProfit	367130000
CY2023	us-gaap	Interest Expense InterestExpense	14821000
CY2022	us-gaap	Interest Expense InterestExpense	20461000
CY2021	us-gaap	Interest Expense InterestExpense	23972000
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CY2022	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	7299000
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CY2021	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	4339000
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CY2022	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-17261000
CY2021	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-4339000
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CY2022	us-gaap	Net Income Loss NetIncomeLoss	1330914000
CY2021	us-gaap	Net Income Loss NetIncomeLoss	337573000
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	25.45
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	77.67
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	22.04
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	24.20
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	63.88
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	19.20
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	18233000
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17136000
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	15318000
CY2023	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	19183000
CY2022	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	20985000
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	17579000
CY2023	us-gaap	Net Income Loss NetIncomeLoss	464038000
CY2022	us-gaap	Net Income Loss NetIncomeLoss	1330914000
CY2021	us-gaap	Net Income Loss NetIncomeLoss	337573000
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Before Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTaxParent	1763000
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Before Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTaxParent	2128000
CY2022	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	1763000
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	2128000
CY2023	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent	24364000
CY2022	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent	-57930000
CY2021	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent	-47562000
CY2023	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent	1662000
CY2022	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent	-12548000
CY2023	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	22702000
CY2022	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-45382000
CY2021	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-47562000
CY2023	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent	39000
CY2022	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent	161000
CY2021	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent	169000
CY2023	us-gaap	Other Comprehensive Income Availableforsale Securities Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent	-16000
CY2022	us-gaap	Other Comprehensive Income Availableforsale Securities Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent	35000
CY2023	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	55000
CY2022	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	126000
CY2021	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	169000
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-22647000
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	47271000
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	49859000
CY2023	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	441391000
CY2022	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1378185000
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	387432000
CY2023Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	287807000
CY2022Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	236059000
CY2023Q4	us-gaap	Available For Sale Securities Debt Securities Current AvailableForSaleSecuritiesDebtSecuritiesCurrent	32724000
CY2022Q4	us-gaap	Available For Sale Securities Debt Securities Current AvailableForSaleSecuritiesDebtSecuritiesCurrent	36993000
CY2023Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	1100000
CY2022Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	1100000
CY2023Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	0
CY2022Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	0
CY2023Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	273522000
CY2022Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	236999000
CY2023Q4	us-gaap	Other Receivables OtherReceivables	13700000
CY2022Q4	us-gaap	Other Receivables OtherReceivables	18301000
CY2023Q4	us-gaap	Inventory Net InventoryNet	244261000
CY2022Q4	us-gaap	Inventory Net InventoryNet	223015000
CY2023Q4	us-gaap	Other Assets Current OtherAssetsCurrent	64653000
CY2022Q4	us-gaap	Other Assets Current OtherAssetsCurrent	71384000
CY2023Q4	us-gaap	Assets Current AssetsCurrent	917767000
CY2022Q4	us-gaap	Assets Current AssetsCurrent	823851000
CY2023Q4	arch	Coal Lands And Mineral Rights CoalLandsAndMineralRights	402387000
CY2022Q4	arch	Coal Lands And Mineral Rights CoalLandsAndMineralRights	406085000
CY2023Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	1099511000
CY2022Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	968420000
CY2023Q4	arch	Deferred Mine Development DeferredMineDevelopment	509637000
CY2022Q4	arch	Deferred Mine Development DeferredMineDevelopment	475037000
CY2023Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	2011535000
CY2022Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1849542000
CY2023Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	782644000
CY2022Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	662514000
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1228891000
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1187028000
CY2023Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	124024000
CY2022Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	209470000
CY2023Q4	us-gaap	Equity Method Investments EquityMethodInvestments	22815000
CY2022Q4	us-gaap	Equity Method Investments EquityMethodInvestments	17267000
CY2023Q4	arch	Sinking Fund For Asset Retirement Obligation Non Current SinkingFundForAssetRetirementObligationNonCurrent	142266000
CY2022Q4	arch	Sinking Fund For Asset Retirement Obligation Non Current SinkingFundForAssetRetirementObligationNonCurrent	135993000
CY2023Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	48410000
CY2022Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	59499000
CY2023Q4	arch	Other Assets Non Current Total OtherAssetsNonCurrentTotal	337515000
CY2022Q4	arch	Other Assets Non Current Total OtherAssetsNonCurrentTotal	422229000
CY2023Q4	us-gaap	Assets Assets	2484173000
CY2022Q4	us-gaap	Assets Assets	2433108000
CY2023Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	205001000
CY2022Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	211848000
CY2023Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	127617000
CY2022Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	157043000
CY2023Q4	us-gaap	Debt Current DebtCurrent	35343000
CY2022Q4	us-gaap	Debt Current DebtCurrent	57988000
CY2023Q4	us-gaap	Liabilities Current LiabilitiesCurrent	367961000
CY2022Q4	us-gaap	Liabilities Current LiabilitiesCurrent	426879000
CY2023Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	105252000
CY2022Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	116288000
CY2023Q4	us-gaap	Mine Reclamation And Closing Liability Noncurrent MineReclamationAndClosingLiabilityNoncurrent	255740000
CY2022Q4	us-gaap	Mine Reclamation And Closing Liability Noncurrent MineReclamationAndClosingLiabilityNoncurrent	235736000
CY2023Q4	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	878000
CY2022Q4	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	1101000
CY2023Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent	47494000
CY2022Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent	49674000
CY2023Q4	us-gaap	Workers Compensation Liability Noncurrent WorkersCompensationLiabilityNoncurrent	154650000
CY2022Q4	us-gaap	Workers Compensation Liability Noncurrent WorkersCompensationLiabilityNoncurrent	155756000
CY2023Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	72742000
CY2022Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	82094000
CY2023Q4	us-gaap	Liabilities Liabilities	1004717000
CY2022Q4	us-gaap	Liabilities Liabilities	1067528000
CY2023Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2022Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2023Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	300000000
CY2022Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	300000000
CY2023Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	30557000
CY2022Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	28761000
CY2023Q4	us-gaap	Common Stock Value CommonStockValue	306000
CY2022Q4	us-gaap	Common Stock Value CommonStockValue	288000
CY2023Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	720029000
CY2022Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	724660000
CY2023Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1830018000
CY2022Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1565374000
CY2023Q4	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	12197000
CY2022Q4	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	11207000
CY2023Q4	us-gaap	Treasury Stock Value TreasuryStockValue	1109679000
CY2022Q4	us-gaap	Treasury Stock Value TreasuryStockValue	986171000
CY2023Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	38782000
CY2022Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	61429000
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	1479456000
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	1365580000
CY2023Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2484173000
CY2022Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2433108000
CY2023	us-gaap	Profit Loss ProfitLoss	464038000
CY2022	us-gaap	Profit Loss ProfitLoss	1330914000
CY2021	us-gaap	Profit Loss ProfitLoss	337573000
CY2023	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	146418000
CY2022	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	133300000
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	120327000
CY2023	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	21170000
CY2022	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	17721000
CY2021	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	21748000
CY2023	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-87091000
CY2022	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	222023000
CY2021	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-8000
CY2023	us-gaap	Share Based Compensation ShareBasedCompensation	25443000
CY2022	us-gaap	Share Based Compensation ShareBasedCompensation	27383000
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	20539000
CY2023	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	1751000
CY2022	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	2459000
CY2021	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	6549000
CY2023	us-gaap	Discontinued Operation Gain Loss From Disposal Of Discontinued Operation Before Income Tax DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax	731000
CY2022	us-gaap	Discontinued Operation Gain Loss From Disposal Of Discontinued Operation Before Income Tax DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax	997000
CY2021	us-gaap	Discontinued Operation Gain Loss From Disposal Of Discontinued Operation Before Income Tax DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax	-23276000
CY2023	arch	Reclamation Amount Recognized ReclamationAmountRecognized	21456000
CY2022	arch	Reclamation Amount Recognized ReclamationAmountRecognized	13720000
CY2021	arch	Reclamation Amount Recognized ReclamationAmountRecognized	39047000
CY2023	arch	Contribution To Sinking Fund For Asset Retirement Obligations ContributionToSinkingFundForAssetRetirementObligations	6273000
CY2022	arch	Contribution To Sinking Fund For Asset Retirement Obligations ContributionToSinkingFundForAssetRetirementObligations	115993000
CY2021	arch	Contribution To Sinking Fund For Asset Retirement Obligations ContributionToSinkingFundForAssetRetirementObligations	20000000
CY2023	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	31763000
CY2022	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	-77274000
CY2021	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	212950000
CY2023	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	21246000
CY2022	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	66281000
CY2021	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	30726000
CY2023	us-gaap	Increase Decrease In Other Accounts Payable And Accrued Liabilities IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities	-31323000
CY2022	us-gaap	Increase Decrease In Other Accounts Payable And Accrued Liabilities IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities	84947000
CY2021	us-gaap	Increase Decrease In Other Accounts Payable And Accrued Liabilities IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities	45547000
CY2023	us-gaap	Increase Decrease In Income Taxes Payable Net Of Income Taxes Receivable IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable	-938000
CY2022	us-gaap	Increase Decrease In Income Taxes Payable Net Of Income Taxes Receivable IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable	-30507000
CY2021	us-gaap	Increase Decrease In Income Taxes Payable Net Of Income Taxes Receivable IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable	1820000
CY2023	us-gaap	Increase Decrease In Derivative Assets And Liabilities IncreaseDecreaseInDerivativeAssetsAndLiabilities	-1572000
CY2022	us-gaap	Increase Decrease In Derivative Assets And Liabilities IncreaseDecreaseInDerivativeAssetsAndLiabilities	-1274000
CY2021	us-gaap	Increase Decrease In Derivative Assets And Liabilities IncreaseDecreaseInDerivativeAssetsAndLiabilities	3553000
CY2023	us-gaap	Increase Decrease In Asset Retirement Obligations IncreaseDecreaseInAssetRetirementObligations	3441000
CY2022	us-gaap	Increase Decrease In Asset Retirement Obligations IncreaseDecreaseInAssetRetirementObligations	-1193000
CY2021	us-gaap	Increase Decrease In Asset Retirement Obligations IncreaseDecreaseInAssetRetirementObligations	-13697000
CY2023	us-gaap	Increase Decrease In Pension And Postretirement Obligations IncreaseDecreaseInPensionAndPostretirementObligations	-10434000
CY2022	us-gaap	Increase Decrease In Pension And Postretirement Obligations IncreaseDecreaseInPensionAndPostretirementObligations	-25537000
CY2021	us-gaap	Increase Decrease In Pension And Postretirement Obligations IncreaseDecreaseInPensionAndPostretirementObligations	4571000
CY2023	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-8614000
CY2022	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-10519000
CY2021	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	23701000
CY2023	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	635374000
CY2022	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1209540000
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	238284000
CY2023	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	176037000
CY2022	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	172728000
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	245440000
CY2023	us-gaap	Payments To Acquire Royalty Interests In Mining Properties PaymentsToAcquireRoyaltyInterestsInMiningProperties	1175000
CY2022	us-gaap	Payments To Acquire Royalty Interests In Mining Properties PaymentsToAcquireRoyaltyInterestsInMiningProperties	1069000
CY2021	us-gaap	Payments To Acquire Royalty Interests In Mining Properties PaymentsToAcquireRoyaltyInterestsInMiningProperties	1186000
CY2023	arch	Proceeds From Payments For Disposals And Divestitures ProceedsFromPaymentsForDisposalsAndDivestitures	4055000
CY2022	arch	Proceeds From Payments For Disposals And Divestitures ProceedsFromPaymentsForDisposalsAndDivestitures	1972000
CY2021	arch	Proceeds From Payments For Disposals And Divestitures ProceedsFromPaymentsForDisposalsAndDivestitures	21228000
CY2023	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	35412000
CY2022	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	39731000
CY2023	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	40292000
CY2022	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	17337000
CY2021	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	87486000
CY2023	arch	Purchases Of Investments Advances To Affiliates PurchasesOfInvestmentsAdvancesToAffiliates	17345000
CY2022	arch	Purchases Of Investments Advances To Affiliates PurchasesOfInvestmentsAdvancesToAffiliates	9575000
CY2021	arch	Purchases Of Investments Advances To Affiliates PurchasesOfInvestmentsAdvancesToAffiliates	3303000
CY2023	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-185622000
CY2022	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-203794000
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-141215000
CY2023	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	3000000
CY2022	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	273788000
CY2021	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	7895000
CY2021	arch	Proceeds From Equipment Financing ProceedsFromEquipmentFinancing	19438000
CY2021	us-gaap	Proceeds From Issuance Of Debt ProceedsFromIssuanceOfDebt	44985000
CY2023	us-gaap	Repayments Of Convertible Debt RepaymentsOfConvertibleDebt	58430000
CY2022	us-gaap	Repayments Of Convertible Debt RepaymentsOfConvertibleDebt	208130000
CY2023	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	18943000
CY2022	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	11235000
CY2021	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	11195000
CY2022	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	1035000
CY2021	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	2057000
CY2023	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	125508000
CY2022	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	156790000
CY2023	us-gaap	Payments Of Ordinary Dividends PaymentsOfOrdinaryDividends	206125000
CY2022	us-gaap	Payments Of Ordinary Dividends PaymentsOfOrdinaryDividends	456392000
CY2021	us-gaap	Payments Of Ordinary Dividends PaymentsOfOrdinaryDividends	3830000
CY2023	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	30240000
CY2022	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	7052000
CY2021	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	4840000
CY2023	us-gaap	Proceeds From Warrant Exercises ProceedsFromWarrantExercises	44242000
CY2022	us-gaap	Proceeds From Warrant Exercises ProceedsFromWarrantExercises	19540000
CY2021	us-gaap	Proceeds From Warrant Exercises ProceedsFromWarrantExercises	1175000
CY2023	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-398004000
CY2022	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1094882000
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	35781000
CY2023	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	51748000
CY2022	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-89136000
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	132850000
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	237159000
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	326295000
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	193445000
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	288907000
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	237159000
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	326295000
CY2023Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	287807000
CY2022Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	236059000
CY2021Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	325194000
CY2023Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	1100000
CY2022Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	1100000
CY2021Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	1101000
CY2023	us-gaap	Interest Paid Net InterestPaidNet	10466000
CY2022	us-gaap	Interest Paid Net InterestPaidNet	18820000
CY2021	us-gaap	Interest Paid Net InterestPaidNet	31568000
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	283561000
CY2021	us-gaap	Dividends Dividends	4001000
CY2021	us-gaap	Stock Issued During Period Shares Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures	157609
CY2021	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	2000
CY2021	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	20539000
CY2021	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	4842000
CY2021	us-gaap	Adjustments To Additional Paid In Capital Warrant Issued AdjustmentsToAdditionalPaidInCapitalWarrantIssued	1175000
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	387432000
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	683866000
CY2022	arch	Cumulative Effect Of Accounting Change On Convertible Debt CumulativeEffectOfAccountingChangeOnConvertibleDebt	-32521000
CY2022	us-gaap	Dividends Dividends	456459000
CY2022	arch	Dividend Equivalents Earned Equity Instruments Other Than Options Grants DividendEquivalentsEarnedEquityInstrumentsOtherThanOptionsGrants	27451000
CY2022	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	1118457
CY2022	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	158790000
CY2022	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	27383000
CY2022	arch	Stock Issued During Period Value Conversion Of Convertible Debt Repurchased StockIssuedDuringPeriodValueConversionOfConvertibleDebtRepurchased	61124000
CY2022	us-gaap	Stock Issued During Period Shares Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures	92314
CY2022	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	1000
CY2022	us-gaap	Stock Issued During Period Shares Conversion Of Convertible Securities StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities	2636660
CY2022	us-gaap	Stock Issued During Period Value Conversion Of Convertible Securities StockIssuedDuringPeriodValueConversionOfConvertibleSecurities	-6000
CY2022	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	7052000
CY2022Q4	us-gaap	Class Of Warrant Or Right Number Of Securities Called By Warrants Or Rights ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights	561561
CY2022	us-gaap	Adjustments To Additional Paid In Capital Warrant Issued AdjustmentsToAdditionalPaidInCapitalWarrantIssued	19548000
CY2022	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1378185000
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	1365580000
CY2023	us-gaap	Dividends Dividends	192471000
CY2023	arch	Dividend Equivalents Earned Equity Instruments Other Than Options Grants DividendEquivalentsEarnedEquityInstrumentsOtherThanOptionsGrants	6495000
CY2023	us-gaap	Stock Issued During Period Shares Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures	311506
CY2023	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	989792
CY2023	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	123508000
CY2023	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	25443000
CY2023	arch	Stock Issued During Period Value Conversion Of Convertible Debt Repurchased StockIssuedDuringPeriodValueConversionOfConvertibleDebtRepurchased	44486000
CY2023	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	30240000
CY2023Q4	us-gaap	Class Of Warrant Or Right Number Of Securities Called By Warrants Or Rights ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights	1484226
CY2023	us-gaap	Adjustments To Additional Paid In Capital Warrant Issued AdjustmentsToAdditionalPaidInCapitalWarrantIssued	44242000
CY2023	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	441391000
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	1479456000
CY2023	us-gaap	Use Of Estimates UseOfEstimates	<p style="font-family:'Times New Roman','Times','serif';font-size:10pt;font-style:italic;font-weight:bold;margin:0pt 0pt 12pt 0pt;">Accounting Estimates</p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-indent:18pt;margin:0pt 0pt 12pt 0pt;">The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and revenues and expenses in the accompanying consolidated financial statements and the disclosure of contingent assets and liabilities. Actual results could differ from those estimates.</p>
CY2023Q4	arch	Restricted Cash Current Customer Deposits RestrictedCashCurrentCustomerDeposits	1100000
CY2022Q4	arch	Restricted Cash Current Customer Deposits RestrictedCashCurrentCustomerDeposits	1100000
CY2023Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	32715000
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	15000
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	6000
CY2023Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	32724000
CY2023Q4	us-gaap	Mineral Rights MineralRights	215600000
CY2022Q4	us-gaap	Mineral Rights MineralRights	239400000
CY2023Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	1000000.0
CY2023Q4	us-gaap	Deferred Finance Costs Current Net DeferredFinanceCostsCurrentNet	600000
CY2022Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	1600000
CY2022Q4	us-gaap	Deferred Finance Costs Current Net DeferredFinanceCostsCurrentNet	600000
CY2023Q4	us-gaap	Energy Related Inventory Coal EnergyRelatedInventoryCoal	99174000
CY2022Q4	us-gaap	Energy Related Inventory Coal EnergyRelatedInventoryCoal	96954000
CY2023Q4	us-gaap	Inventory Parts And Components Net Of Reserves InventoryPartsAndComponentsNetOfReserves	145087000
CY2022Q4	us-gaap	Inventory Parts And Components Net Of Reserves InventoryPartsAndComponentsNetOfReserves	126061000
CY2023Q4	us-gaap	Inventory Net InventoryNet	244261000
CY2022Q4	us-gaap	Inventory Net InventoryNet	223015000
CY2023Q4	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	1600000
CY2023	arch	Defined Benefit Plan Termination Final Contribution Amount DefinedBenefitPlanTerminationFinalContributionAmount	3200000
CY2020Q4	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	155300000
CY2020Q4	us-gaap	Debt Instrument Interest Rate Stated Percentage DebtInstrumentInterestRateStatedPercentage	0.0525
CY2022Q4	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	2400000
CY2022Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	37014000
CY2022Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	21000
CY2022Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	42000
CY2022Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	36993000
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	2200000
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	22600000
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	2300000
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	0.0
CY2023Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	998000
CY2023Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	165000
CY2022Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	2707000
CY2023Q4	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	0
CY2023Q4	us-gaap	Derivative Assets DerivativeAssets	998000
CY2023Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	165000
CY2023Q4	us-gaap	Derivative Assets Liabilities At Fair Value Net DerivativeAssetsLiabilitiesAtFairValueNet	833000
CY2022Q4	us-gaap	Derivative Assets DerivativeAssets	2707000
CY2022Q4	us-gaap	Derivative Assets Liabilities At Fair Value Net DerivativeAssetsLiabilitiesAtFairValueNet	2707000
CY2023Q4	us-gaap	Derivative Assets Liabilities At Fair Value Net DerivativeAssetsLiabilitiesAtFairValueNet	833000
CY2022Q4	us-gaap	Derivative Assets Liabilities At Fair Value Net DerivativeAssetsLiabilitiesAtFairValueNet	2707000
CY2023	arch	Change In Fair Value Of Coal Derivatives And Coal Trading Activities Net ChangeInFairValueOfCoalDerivativesAndCoalTradingActivitiesNet	-1572000
CY2022	arch	Change In Fair Value Of Coal Derivatives And Coal Trading Activities Net ChangeInFairValueOfCoalDerivativesAndCoalTradingActivitiesNet	-1274000
CY2021	arch	Change In Fair Value Of Coal Derivatives And Coal Trading Activities Net ChangeInFairValueOfCoalDerivativesAndCoalTradingActivitiesNet	2392000
CY2023Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	37259000
CY2022Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	61836000
CY2023Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	51155000
CY2022Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	53105000
CY2023Q4	us-gaap	Interest Payable Current InterestPayableCurrent	2395000
CY2022Q4	us-gaap	Interest Payable Current InterestPayableCurrent	2511000
CY2023Q4	us-gaap	Workers Compensation Liability Current WorkersCompensationLiabilityCurrent	18724000
CY2022Q4	us-gaap	Workers Compensation Liability Current WorkersCompensationLiabilityCurrent	17584000
CY2023Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	6089000
CY2022Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	8632000
CY2023Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	11995000
CY2022Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	13375000
CY2023Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	127617000
CY2022Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	157043000
CY2023Q4	us-gaap	Deferred Finance Costs Gross DeferredFinanceCostsGross	1511000
CY2022Q4	us-gaap	Deferred Finance Costs Gross DeferredFinanceCostsGross	2929000
CY2023Q4	us-gaap	Long Term Debt LongTermDebt	140595000
CY2022Q4	us-gaap	Long Term Debt LongTermDebt	174276000
CY2023Q4	us-gaap	Debt Current DebtCurrent	35343000
CY2022Q4	us-gaap	Debt Current DebtCurrent	57988000
CY2023Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	105252000
CY2022Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	116288000
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	36268000
CY2022Q4	us-gaap	Deferred Tax Liabilities Other Finite Lived Assets DeferredTaxLiabilitiesOtherFiniteLivedAssets	4825000
CY2023Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	5386000
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	105838000
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	0
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	0
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	0
CY2023Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	0
CY2023Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	142106000
CY2023	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	0.0
CY2022	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	1000000.0
CY2021	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	2100000
CY2023	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	106000
CY2022	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-30107000
CY2021	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	1525000
CY2023	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	317000
CY2022	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	204000
CY2021	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	342000
CY2023	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	423000
CY2022	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-29903000
CY2021	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	1867000
CY2023	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	85002000
CY2022	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-209130000
CY2021	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	7000
CY2023	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	2089000
CY2022	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-12893000
CY2023	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	87091000
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-222023000
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	7000
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	87514000
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-251926000
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1874000
CY2023	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	115826000
CY2022	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	226587000
CY2021	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	71284000
CY2023	us-gaap	Income Tax Reconciliation Nondeductible Expense Depletion IncomeTaxReconciliationNondeductibleExpenseDepletion	-30585000
CY2022	us-gaap	Income Tax Reconciliation Nondeductible Expense Depletion IncomeTaxReconciliationNondeductibleExpenseDepletion	-52647000
CY2021	us-gaap	Income Tax Reconciliation Nondeductible Expense Depletion IncomeTaxReconciliationNondeductibleExpenseDepletion	-29392000
CY2023	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	2725000
CY2022	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	2988000
CY2021	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	16490000
CY2023	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-879000
CY2022	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-420688000
CY2021	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-69603000
CY2023	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	427000
CY2022	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-8166000
CY2021	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	13095000
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	87514000
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-251926000
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1874000
CY2023Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	157648000
CY2022Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	219302000
CY2023Q4	arch	Deferred Tax Assets Tax Credit Carryforwards Alternative Minimum Tax And Other Tax Credits DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTaxAndOtherTaxCredits	1584000
CY2022Q4	arch	Deferred Tax Assets Tax Credit Carryforwards Alternative Minimum Tax And Other Tax Credits DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTaxAndOtherTaxCredits	1656000
CY2023Q4	us-gaap	Deferred Tax Assets Investment In Subsidiaries DeferredTaxAssetsInvestmentInSubsidiaries	24933000
CY2022Q4	us-gaap	Deferred Tax Assets Investment In Subsidiaries DeferredTaxAssetsInvestmentInSubsidiaries	39999000
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Asset Retirement Obligations DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations	28070000
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Asset Retirement Obligations DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations	38362000
CY2023Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	212235000
CY2022Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	299319000
CY2023Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	82825000
CY2022Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	83704000
CY2023Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	129410000
CY2022Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	215615000
CY2023Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1075000
CY2022Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1245000
CY2022Q4	us-gaap	Deferred Tax Liabilities Financing Arrangements DeferredTaxLiabilitiesFinancingArrangements	75000
CY2023Q4	us-gaap	Deferred Tax Liabilities Other Finite Lived Assets DeferredTaxLiabilitiesOtherFiniteLivedAssets	4311000
CY2023	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	17747000
CY2022	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	25914000
CY2023	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	21456000
CY2022	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	13720000
CY2023Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	261829000
CY2022Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	244368000
CY2023Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	6089000
CY2022Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	6145000
CY2023Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	124024000
CY2022Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	209470000
CY2023Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	319300000
CY2023Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Subject To Expiration DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration	46600000
CY2023	arch	Deferred Tax Assets Operating Loss Carryforwards Offset Percentage DeferredTaxAssetsOperatingLossCarryforwardsOffsetPercentage	0.80
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	48116000
CY2021	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	3467000
CY2021	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	3931000
CY2021	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	2868000
CY2021	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	3683000
CY2021Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	48963000
CY2022	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	5446000
CY2022	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	768000
CY2022	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	125000
CY2022	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	36988000
CY2022Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	18064000
CY2023	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	3019000
CY2023	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	731000
CY2023	us-gaap	Unrecognized Tax Benefits Increases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsIncreasesResultingFromSettlementsWithTaxingAuthorities	1485000
CY2023	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	2732000
CY2023Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	20567000
CY2023Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	0
CY2022Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	244368000
CY2021Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	214453000
CY2023	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	21170000
CY2022	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	17721000
CY2022Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	8632000
CY2023Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	255740000
CY2022Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	235736000
CY2023Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	32724000
CY2023Q4	us-gaap	Interest Rate Derivative Assets At Fair Value InterestRateDerivativeAssetsAtFairValue	998000
CY2023Q4	us-gaap	Asset Retirement Obligation Legally Restricted Assets Fair Value AssetRetirementObligationLegallyRestrictedAssetsFairValue	142266000
CY2023Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	175988000
CY2023Q4	us-gaap	Interest Rate Derivative Liabilities At Fair Value InterestRateDerivativeLiabilitiesAtFairValue	165000
CY2022Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	36993000
CY2022Q4	us-gaap	Interest Rate Derivative Assets At Fair Value InterestRateDerivativeAssetsAtFairValue	3955000
CY2022Q4	us-gaap	Asset Retirement Obligation Legally Restricted Assets Fair Value AssetRetirementObligationLegallyRestrictedAssetsFairValue	135993000
CY2022Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	176941000
CY2022Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	1300000
CY2021Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	1219000
CY2023	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	-4192000
CY2022	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	7019000
CY2023	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	5400000
CY2022	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	4673000
CY2023	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	1510000
CY2022	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	11611000
CY2023Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	998000
CY2022Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	1300000
CY2023Q4	us-gaap	Debt Instrument Fair Value DebtInstrumentFairValue	142100000
CY2022Q4	us-gaap	Debt Instrument Fair Value DebtInstrumentFairValue	223000000.0
CY2023Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	3.11
CY2023Q1	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	66902000
CY2023Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.45
CY2023Q2	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	45011000
CY2023Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	3.97
CY2023Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	71877000
CY2023Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.13
CY2023Q4	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	22335000
CY2023	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	10.66
CY2023	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	206125000
CY2022Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.25
CY2022Q1	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	3851000
CY2022Q2	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	150716000
CY2022Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	6.00
CY2022Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	8.11
CY2022Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	110071000
CY2022Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	10.75
CY2022Q4	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	191754000
CY2022	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	25.11
CY2022	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	456392000
CY2023	us-gaap	Dividends Common Stock DividendsCommonStock	792100000
CY2022Q2	us-gaap	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	500000000
CY2023	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	989792
CY2023	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	124.78
CY2023	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	123500000
	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	12196627
	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	90.98
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	1109700000
CY2023Q4	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	217700000
CY2020Q1	arch	Additional Collateral Contingent Amount Self Insured AdditionalCollateralContingentAmountSelfInsured	71100000
CY2020Q1	arch	Threshold For Number Of Days To Post Additional Collateral ThresholdForNumberOfDaysToPostAdditionalCollateral	P30D
CY2023Q1	arch	Self Insured Operators Must Post Security Percentage SelfInsuredOperatorsMustPostSecurityPercentage	1.20
CY2023	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	3974000
CY2022	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	5991000
CY2021	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	7796000
CY2023	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	6041000
CY2022	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	4610000
CY2021	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	4439000
CY2023	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-965000
CY2022	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	628000
CY2021	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	2363000
CY2023	arch	Increase Decrease Workers Compensation Obligations Change In Discount Rate IncreaseDecreaseWorkersCompensationObligationsChangeInDiscountRate	3200000
CY2023Q4	us-gaap	Workers Compensation Liability Current And Noncurrent WorkersCompensationLiabilityCurrentAndNoncurrent	173374000
CY2022Q4	us-gaap	Workers Compensation Liability Current And Noncurrent WorkersCompensationLiabilityCurrentAndNoncurrent	173340000
CY2023Q4	us-gaap	Workers Compensation Liability Current WorkersCompensationLiabilityCurrent	18724000
CY2022Q4	us-gaap	Workers Compensation Liability Current WorkersCompensationLiabilityCurrent	17584000
CY2023Q4	us-gaap	Workers Compensation Liability Noncurrent WorkersCompensationLiabilityNoncurrent	154650000
CY2022Q4	us-gaap	Workers Compensation Liability Noncurrent WorkersCompensationLiabilityNoncurrent	155756000
CY2023Q4	us-gaap	Liability For Future Policy Benefits Disability And Accident Benefits LiabilityForFuturePolicyBenefitsDisabilityAndAccidentBenefits	6900000
CY2023Q4	us-gaap	Insurance Settlements Receivable Current InsuranceSettlementsReceivableCurrent	400000
CY2023Q4	us-gaap	Insurance Settlements Receivable Noncurrent InsuranceSettlementsReceivableNoncurrent	6500000
CY2023	us-gaap	Defined Benefit Plan Cost Of Providing Special Or Contractual Termination Benefit Recognized During Period DefinedBenefitPlanCostOfProvidingSpecialOrContractualTerminationBenefitRecognizedDuringPeriod	3200000
CY2023Q4	us-gaap	Defined Benefit Plan Health Care Cost Trend Rate Assumed Next Fiscal Year DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear	0.0737
CY2023Q4	us-gaap	Defined Benefit Plan Ultimate Health Care Cost Trend Rate1 DefinedBenefitPlanUltimateHealthCareCostTrendRate1	0.040
CY2022Q4	arch	Defined Benefit Plan Fair Value Of Plan Assets Net DefinedBenefitPlanFairValueOfPlanAssetsNet	121127000
CY2023	us-gaap	Net Income Loss NetIncomeLoss	464038000
CY2022	us-gaap	Net Income Loss NetIncomeLoss	1330914000
CY2021	us-gaap	Net Income Loss NetIncomeLoss	337573000
CY2023	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther	108000
CY2022	us-gaap	Dilutive Securities Effect On Basic Earnings Per Share Other DilutiveSecuritiesEffectOnBasicEarningsPerShareOther	4726000
CY2022	arch	Dilutive Securities Adjustment For Inducement Payments DilutiveSecuritiesAdjustmentForInducementPayments	4914000
CY2023	us-gaap	Net Income Loss Attributable To Parent Diluted NetIncomeLossAttributableToParentDiluted	464146000
CY2022	us-gaap	Net Income Loss Attributable To Parent Diluted NetIncomeLossAttributableToParentDiluted	1340554000
CY2021	us-gaap	Net Income Loss Attributable To Parent Diluted NetIncomeLossAttributableToParentDiluted	337573000
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	18233000
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	17136000
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	15318000
CY2023	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	866000
CY2022	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	1730000
CY2021	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	654000
CY2023	us-gaap	Incremental Common Shares Attributable To Conversion Of Debt Securities IncrementalCommonSharesAttributableToConversionOfDebtSecurities	84000
CY2022	us-gaap	Incremental Common Shares Attributable To Conversion Of Debt Securities IncrementalCommonSharesAttributableToConversionOfDebtSecurities	2119000
CY2021	us-gaap	Incremental Common Shares Attributable To Conversion Of Debt Securities IncrementalCommonSharesAttributableToConversionOfDebtSecurities	1607000
CY2023	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	19183000
CY2022	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	20985000
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	17579000
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	9626000
CY2022Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	12106000
CY2023Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	1621000
CY2022Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	2918000
CY2023Q4	arch	Lease Assets LeaseAssets	11247000
CY2022Q4	arch	Lease Assets LeaseAssets	15024000
CY2023Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	1041000
CY2022Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	977000
CY2023Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	2789000
CY2022Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	2722000
CY2023Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	2079000
CY2022Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	3121000
CY2023Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	7351000
CY2022Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	9993000
CY2023Q4	arch	Lease Liabilities LeaseLiabilities	13260000
CY2022Q4	arch	Lease Liabilities LeaseLiabilities	16813000
CY2023Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P3Y3M25D
CY2022Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P4Y1M20D
CY2023Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P1Y3M
CY2022Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P2Y3M
CY2023Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.055
CY2022Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.055
CY2023Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.064
CY2022Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.064
CY2023	us-gaap	Operating Lease Cost OperatingLeaseCost	3263000
CY2022	us-gaap	Operating Lease Cost OperatingLeaseCost	3323000
CY2023	us-gaap	Operating Lease Payments OperatingLeasePayments	3356000
CY2022	us-gaap	Operating Lease Payments OperatingLeasePayments	3389000
CY2023	arch	Finance Lease Cost FinanceLeaseCost	1572000
CY2022	arch	Finance Lease Cost FinanceLeaseCost	1572000
CY2023	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	1210000
CY2022	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	1210000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	3281000
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	1210000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	3266000
CY2023Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	2111000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	3080000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	1533000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	11160000
CY2023Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	3321000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	1020000
CY2023Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	201000
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	10140000
CY2023Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	3120000
CY2023	us-gaap	Operating Lease Expense OperatingLeaseExpense	12800000
CY2022	us-gaap	Operating Lease Expense OperatingLeaseExpense	10400000
CY2021	us-gaap	Operating Lease Expense OperatingLeaseExpense	8100000
CY2023	us-gaap	Royalty Expense RoyaltyExpense	177100000
CY2022	us-gaap	Royalty Expense RoyaltyExpense	189700000
CY2021	us-gaap	Royalty Expense RoyaltyExpense	127800000
CY2023Q4	arch	Surety Bonds Outstanding Lease Obligations SuretyBondsOutstandingLeaseObligations	40400000
CY2023	arch	Goods Sold During Year GoodsSoldDuringYear	75000000
CY2023	arch	Percentage Of Goods Sold Under Long Term Contract PercentageOfGoodsSoldUnderLongTermContract	0.75
CY2023	arch	Percentage Company Revenue PercentageCompanyRevenue	0.46
CY2023	arch	Long Term Contracts Life Term Maximum LongTermContractsLifeTermMaximum	P4Y
CY2023	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3145843000
CY2022	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3724593000
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2208042000
CY2023Q4	us-gaap	Litigation Reserve LitigationReserve	0.0
CY2022Q4	us-gaap	Litigation Reserve LitigationReserve	2000000.0
CY2023Q4	arch	Surety Bonds Outstanding SuretyBondsOutstanding	552500000
CY2023Q4	us-gaap	Deposits Assets Noncurrent DepositsAssetsNoncurrent	5600000
CY2023Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On First Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary	221200000
CY2023	arch	Number Of Distinct Lines Of Business NumberOfDistinctLinesOfBusiness	2
CY2023	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3145843000
CY2023	arch	Adjusted Ebitda AdjustedEBITDA	714042000
CY2023	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	146418000
CY2023	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	21170000
CY2023Q4	us-gaap	Assets Assets	2484173000
CY2023	us-gaap	Segment Expenditure Addition To Long Lived Assets SegmentExpenditureAdditionToLongLivedAssets	176037000
CY2022	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3724593000
CY2022	arch	Adjusted Ebitda AdjustedEBITDA	1260432000
CY2022	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	133300000
CY2022	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	17721000
CY2022Q4	us-gaap	Assets Assets	2433108000
CY2022	us-gaap	Segment Expenditure Addition To Long Lived Assets SegmentExpenditureAdditionToLongLivedAssets	172728000
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2208042000
CY2021	arch	Adjusted Ebitda AdjustedEBITDA	533430000
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	120327000
CY2021	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	21748000
CY2021Q4	us-gaap	Assets Assets	2117160000
CY2021	us-gaap	Segment Expenditure Addition To Long Lived Assets SegmentExpenditureAdditionToLongLivedAssets	245440000
CY2023	us-gaap	Net Income Loss NetIncomeLoss	464038000
CY2022	us-gaap	Net Income Loss NetIncomeLoss	1330914000
CY2021	us-gaap	Net Income Loss NetIncomeLoss	337573000
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	87514000
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-251926000
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1874000
CY2023	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	2438000
CY2022	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-13162000
CY2021	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-23344000
CY2023	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	146418000
CY2022	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	133300000
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	120327000
CY2023	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	21170000
CY2022	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	17721000
CY2021	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	21748000
CY2021	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	-24225000
CY2023	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	-3786000
CY2022	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	2841000
CY2021	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	4339000
CY2023	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-1126000
CY2022	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-14420000
CY2023	arch	Adjusted Ebitda AdjustedEBITDA	714042000
CY2022	arch	Adjusted Ebitda AdjustedEBITDA	1260432000
CY2021	arch	Adjusted Ebitda AdjustedEBITDA	533430000
CY2023	arch	Ebitd From Idled Or Otherwise Disposed Operations EBITDFromIdledOrOtherwiseDisposedOperations	15986000
CY2022	arch	Ebitd From Idled Or Otherwise Disposed Operations EBITDFromIdledOrOtherwiseDisposedOperations	-828000
CY2021	arch	Ebitd From Idled Or Otherwise Disposed Operations EBITDFromIdledOrOtherwiseDisposedOperations	2469000
CY2023	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	98871000
CY2022	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	105355000
CY2021	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	92342000
CY2023	arch	Other Income Expense OtherIncomeExpense	14404000
CY2022	arch	Other Income Expense OtherIncomeExpense	10857000
CY2021	arch	Other Income Expense OtherIncomeExpense	-9702000
CY2023	arch	Segment Adjusted Ebitd From Coal Operations SegmentAdjustedEBITDFromCoalOperations	843303000
CY2022	arch	Segment Adjusted Ebitd From Coal Operations SegmentAdjustedEBITDFromCoalOperations	1375816000
CY2021	arch	Segment Adjusted Ebitd From Coal Operations SegmentAdjustedEBITDFromCoalOperations	618539000

Files In Submission

Name	View Source	Status
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arch-20231231.xsd	Edgar Link	pending
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arch-20231231x10k003.jpg	Edgar Link	pending
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$ARCH
ARCH RESOURCES, INC. Stock $arch

2024 Q1 Form 10-K Financial Statement

#000155837024001229 Filed on February 15, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ARCH ARCH RESOURCES, INC. Stock $arch

2024 Q1 Form 10-K Financial Statement

#000155837024001229 Filed on February 15, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ARCH
ARCH RESOURCES, INC. Stock $arch