$ARCH
ARCH RESOURCES, INC. Stock $arch

$arch Overview Financials Valuation SEC Filings Company Website

2019 Q4 Form 10-Q Financial Statement

#000162828019012459 Filed on October 22, 2019

Income Statement

Concept	2019 Q4	2019 Q3	2018 Q4
Revenue	$549.5M	$619.5M	$651.0M
YoY Change	-15.59%	-2.17%	16.19%
Cost Of Revenue	$492.5M	$491.0M	$514.0M
YoY Change	-4.18%	1.86%	14.04%
Gross Profit	$23.14M	$106.5M	$101.4M
YoY Change	-77.17%	-2.97%	59.78%
Gross Profit Margin	4.21%	17.19%	15.58%
Selling, General & Admin	$21.90M	$24.57M	$26.70M
YoY Change	-17.98%	7.23%	14.1%
% of Gross Profit	94.62%	23.07%	26.33%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$29.90M	$30.25M	$27.60M
YoY Change	8.33%	-4.58%	-1.43%
% of Gross Profit	129.19%	28.41%	27.22%
Operating Expenses	$46.60M	$513.0M	$63.40M
YoY Change	-26.5%	-6.78%	18.28%
Operating Profit	-$6.960M	$106.1M	$86.49M
YoY Change	-108.05%	28.06%	69.2%
Interest Expense	-$3.200M	$4.049M	$10.30M
YoY Change	-131.07%	-21.82%	-209.57%
% of Operating Profit		3.81%	11.91%
Other Income/Expense, Net	$100.0K	$975.0K	-$1.000M
YoY Change	-110.0%	-163.68%	400.0%
Pretax Income	-$8.800M	$107.1M	$82.70M
YoY Change	-110.64%	37.37%	77.85%
Income Tax	-$300.0K	$347.0K	-$3.400M
% Of Pretax Income		0.32%	-4.11%
Net Earnings	-$8.551M	$106.8M	$86.09M
YoY Change	-109.93%	-13.33%	5.93%
Net Earnings / Revenue	-1.56%	17.24%	13.23%
Basic Earnings Per Share		$6.79
Diluted Earnings Per Share	-$0.57	$6.34	$4.44
COMMON SHARES
Basic Shares Outstanding	15.04M shares	15.74M	18.80M shares
Diluted Shares Outstanding		16.85M

Balance Sheet

Concept	2019 Q4	2019 Q3	2018 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$288.7M	$351.5M	$427.7M
YoY Change	-32.51%	-13.9%	-0.35%
Cash & Equivalents	$153.0M	$175.4M	$264.9M
Short-Term Investments	$135.7M	$176.1M	$162.8M
Other Short-Term Assets	$97.89M	$113.5M	$75.75M
YoY Change	29.23%	19.43%	7.56%
Inventory	$130.9M	$171.5M	$125.5M
Prepaid Expenses
Receivables	$168.1M	$206.1M	$200.9M
Other Receivables	$21.00M	$24.00M	$49.00M
Total Short-Term Assets	$706.7M	$867.0M	$878.8M
YoY Change	-19.58%	-1.19%	5.75%
LONG-TERM ASSETS
Property, Plant & Equipment	$984.5M	$889.3M	$834.8M
YoY Change	17.93%	-3.3%	-12.67%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$105.6M	$107.5M	$104.7M
YoY Change	0.87%	2.11%	-1.35%
Other Assets	$70.91M	$70.79M	$68.00M
YoY Change	4.28%	-25.69%	13.75%
Total Long-Term Assets	$1.161B	$178.3M	$173.4M
YoY Change	569.37%	-11.1%	-9.99%
TOTAL ASSETS
Total Short-Term Assets	$706.7M	$867.0M	$878.8M
Total Long-Term Assets	$1.161B	$178.3M	$173.4M
Total Assets	$1.868B	$1.935B	$1.887B
YoY Change	-1.02%	-3.15%	-4.68%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$133.1M	$166.1M	$128.0M
YoY Change	3.93%	38.87%	-4.56%
Accrued Expenses	$157.2M	$161.9M	$183.5M
YoY Change	-14.36%	-20.49%	-0.35%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$21.00M	$12.00M	$18.00M
YoY Change	16.67%	9.09%	12.5%
Total Short-Term Liabilities	$311.0M	$340.0M	$329.3M
YoY Change	-5.57%	1.56%	-1.42%
LONG-TERM LIABILITIES
Long-Term Debt	$290.1M	$292.8M	$300.2M
YoY Change	-3.37%	-3.32%	-3.21%
Other Long-Term Liabilities	$82.10M	$93.03M	$48.80M
YoY Change	68.23%	50.31%	-17.92%
Total Long-Term Liabilities	$372.2M	$385.8M	$349.0M
YoY Change	6.64%	5.78%	-5.57%
TOTAL LIABILITIES
Total Short-Term Liabilities	$311.0M	$340.0M	$329.3M
Total Long-Term Liabilities	$372.2M	$385.8M	$349.0M
Total Liabilities	$1.227B	$1.229B	$1.182B
YoY Change	3.8%	-6.21%	-10.01%
SHAREHOLDERS EQUITY
Retained Earnings	$731.4M	$746.9M	$527.7M
YoY Change	38.62%	66.31%	113.43%
Common Stock	$730.8M	$735.1M	$717.7M
YoY Change	1.82%	3.16%	2.48%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$827.4M	$816.9M	$583.9M
YoY Change	41.7%	64.95%	93.27%
Treasury Stock Shares	$10.09M	9.955M shares	7.216M shares
Shareholders Equity	$640.5M	$705.4M	$704.8M
YoY Change
Total Liabilities & Shareholders Equity	$1.868B	$1.935B	$1.887B
YoY Change	-1.02%	-3.15%	-4.68%

Cashflow Statement

Concept	2019 Q4	2019 Q3	2018 Q4
OPERATING ACTIVITIES
Net Income	-$8.551M	$106.8M	$86.09M
YoY Change	-109.93%	-13.33%	5.93%
Depreciation, Depletion And Amortization	$29.90M	$30.25M	$27.60M
YoY Change	8.33%	-4.58%	-1.43%
Cash From Operating Activities	$85.60M	$108.2M	$151.9M
YoY Change	-43.65%	-10.65%	60.91%
INVESTING ACTIVITIES
Capital Expenditures	-$129.0M	$49.45M	-$39.60M
YoY Change	225.76%	92.47%	36.55%
Acquisitions
YoY Change
Other Investing Activities	$43.90M	-$14.70M	-$100.0K
YoY Change	-44000.0%	425.0%	-90.0%
Cash From Investing Activities	-$85.10M	-$64.30M	-$39.70M
YoY Change	114.36%	121.72%	32.78%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-22.90M	-100.9M	-92.90M
YoY Change	-75.35%	14.53%	4.26%
NET CHANGE
Cash From Operating Activities	85.60M	108.2M	151.9M
Cash From Investing Activities	-85.10M	-64.30M	-39.70M
Cash From Financing Activities	-22.90M	-100.9M	-92.90M
Net Change In Cash	-22.40M	-57.00M	19.30M
YoY Change	-216.06%	-1525.0%	-178.46%
FREE CASH FLOW
Cash From Operating Activities	$85.60M	$108.2M	$151.9M
Capital Expenditures	-$129.0M	$49.45M	-$39.60M
Free Cash Flow	$214.6M	$58.75M	$191.5M
YoY Change	12.06%	-38.42%	55.19%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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	dei	Amendment Flag AmendmentFlag	false
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2019
	dei	Entity Central Index Key EntityCentralIndexKey	0001037676
CY2018Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.40
CY2018Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.40
CY2018Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.40
CY2019Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.45
CY2018Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2019Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2018Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	300000000	shares
CY2019Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	300000000	shares
CY2018Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	25047000	shares
CY2019Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	25050000	shares
CY2019Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P6Y2M9D
CY2018Q1	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	407091000	shares
CY2018Q2	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	960105000	shares
CY2018Q3	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	870358000	shares
CY2019Q1	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	872317000	shares
CY2019Q2	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	697255000	shares
CY2019Q3	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	1169597000	shares
CY2018Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	7216000	shares
CY2019Q3	us-gaap	Treasury Stock Shares TreasuryStockShares	9955000	shares
	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2019-09-30
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity File Number EntityFileNumber	1-13105
	dei	Entity Registrant Name EntityRegistrantName	Arch Coal Inc
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	43-0921172
	dei	Entity Address Address Line1 EntityAddressAddressLine1	One CityPlace Drive
	dei	Entity Address Address Line2 EntityAddressAddressLine2	Suite 300
	dei	Entity Address City Or Town EntityAddressCityOrTown	St. Louis
	dei	Entity Address State Or Province EntityAddressStateOrProvince	MO
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	63141
	dei	City Area Code CityAreaCode	314
	dei	Local Phone Number LocalPhoneNumber	994-2700
	dei	Security12b Title Security12bTitle	Common stock, $.01 par value
	dei	Trading Symbol TradingSymbol	ARCH
	dei	Security Exchange Name SecurityExchangeName	NYSE
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Small Business EntitySmallBusiness	false
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Entity Shell Company EntityShellCompany	false
	dei	Entity Bankruptcy Proceedings Reporting Current EntityBankruptcyProceedingsReportingCurrent	true
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CY2019Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	619467000	USD
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CY2018Q3	aci	Depreciation Depletionand Amortization Productionand Nonproduction DepreciationDepletionandAmortizationProductionandNonproduction	31775000	USD
	aci	Depreciation Depletionand Amortization Productionand Nonproduction DepreciationDepletionandAmortizationProductionandNonproduction	82199000	USD
	aci	Depreciation Depletionand Amortization Productionand Nonproduction DepreciationDepletionandAmortizationProductionandNonproduction	92027000	USD
CY2019Q3	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	5137000	USD
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	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	15411000	USD
	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	20977000	USD
CY2019Q3	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	-153000	USD
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	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	-77000	USD
	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	9540000	USD
CY2019Q3	aci	Change In Fair Value Of Coal Derivatives And Coal Trading Activities Net ChangeInFairValueOfCoalDerivativesAndCoalTradingActivitiesNet	1530000	USD
CY2018Q3	aci	Change In Fair Value Of Coal Derivatives And Coal Trading Activities Net ChangeInFairValueOfCoalDerivativesAndCoalTradingActivitiesNet	10418000	USD
	aci	Change In Fair Value Of Coal Derivatives And Coal Trading Activities Net ChangeInFairValueOfCoalDerivativesAndCoalTradingActivitiesNet	-19851000	USD
	aci	Change In Fair Value Of Coal Derivatives And Coal Trading Activities Net ChangeInFairValueOfCoalDerivativesAndCoalTradingActivitiesNet	22142000	USD
CY2019Q3	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	24566000	USD
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	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	73864000	USD
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CY2019Q3	aci	Operating Income Expense Relatedto Joint Venture OperatingIncomeExpenseRelatedtoJointVenture	-3754000	USD
CY2018Q3	aci	Operating Income Expense Relatedto Joint Venture OperatingIncomeExpenseRelatedtoJointVenture	0	USD
	aci	Operating Income Expense Relatedto Joint Venture OperatingIncomeExpenseRelatedtoJointVenture	-6772000	USD
	aci	Operating Income Expense Relatedto Joint Venture OperatingIncomeExpenseRelatedtoJointVenture	0	USD
CY2019Q3	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	0	USD
CY2018Q3	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	0	USD
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CY2019Q3	us-gaap	Gain Loss Related To Litigation Settlement GainLossRelatedToLitigationSettlement	39000000	USD
CY2018Q3	us-gaap	Gain Loss Related To Litigation Settlement GainLossRelatedToLitigationSettlement	0	USD
	us-gaap	Gain Loss Related To Litigation Settlement GainLossRelatedToLitigationSettlement	39000000	USD
	us-gaap	Gain Loss Related To Litigation Settlement GainLossRelatedToLitigationSettlement	0	USD
CY2019Q3	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	4254000	USD
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	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	9143000	USD
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	us-gaap	Interest Expense InterestExpense	12856000	USD
	us-gaap	Interest Expense InterestExpense	15624000	USD
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	us-gaap	Operating Income Loss OperatingIncomeLoss	244914000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	181650000	USD
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	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-4292000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	107116000	USD
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	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	242858000	USD
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	us-gaap	Net Income Loss NetIncomeLoss	242350000	USD
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CY2019Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.45
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	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.35
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.20
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	106769000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	123192000	USD
	us-gaap	Net Income Loss NetIncomeLoss	242350000	USD
	us-gaap	Net Income Loss NetIncomeLoss	226483000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesBeforeTaxPortionAttributableToParent	-2360000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesBeforeTaxPortionAttributableToParent	64000	USD
	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesBeforeTaxPortionAttributableToParent	-2421000	USD
	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesBeforeTaxPortionAttributableToParent	-5672000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesTaxPortionAttributableToParent	0	USD
CY2018Q3	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesTaxPortionAttributableToParent	0	USD
	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesTaxPortionAttributableToParent	0	USD
	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesTaxPortionAttributableToParent	0	USD
CY2019Q3	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent	-2360000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent	64000	USD
	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent	-2421000	USD
	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent	-5672000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent	4019000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent	-2736000	USD
	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent	1117000	USD
	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent	-6389000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent	0	USD
CY2018Q3	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent	0	USD
	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent	0	USD
	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent	0	USD
CY2019Q3	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	4019000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-2736000	USD
	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	1117000	USD
	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-6389000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent	-98000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent	102000	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent	553000	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent	-379000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Availableforsale Securities Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent	0	USD
CY2018Q3	us-gaap	Other Comprehensive Income Availableforsale Securities Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent	0	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent	0	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent	0	USD
CY2019Q3	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-98000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	102000	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	553000	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-379000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-6477000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	2902000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-2985000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	338000	USD
CY2019Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	100292000	USD
CY2018Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	126094000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	239365000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	226821000	USD
CY2019Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	175428000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	264937000	USD
CY2019Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	206149000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	834828000	USD
CY2019Q3	us-gaap	Equity Method Investments EquityMethodInvestments	107543000	USD
CY2018Q4	us-gaap	Equity Method Investments EquityMethodInvestments	104676000	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Securities Current AvailableForSaleSecuritiesDebtSecuritiesCurrent	176056000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Securities Current AvailableForSaleSecuritiesDebtSecuritiesCurrent	162797000	USD
CY2019Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	70793000	USD
CY2018Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	68773000	USD
CY2019Q3	us-gaap	Assets Noncurrent AssetsNoncurrent	178336000	USD
CY2018Q4	us-gaap	Assets Noncurrent AssetsNoncurrent	173449000	USD
CY2019Q3	us-gaap	Assets Assets	1934600000	USD
CY2018Q4	us-gaap	Assets Assets	1887060000	USD
CY2019Q3	us-gaap	Accounts Payable Current AccountsPayableCurrent	166129000	USD
CY2018Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	128024000	USD
CY2019Q3	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	161939000	USD
CY2018Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	48801000	USD
CY2019Q3	us-gaap	Liabilities Liabilities	1229164000	USD
CY2018Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	200904000	USD
CY2019Q3	us-gaap	Other Receivables OtherReceivables	24291000	USD
CY2018Q4	us-gaap	Other Receivables OtherReceivables	48926000	USD
CY2019Q3	us-gaap	Inventory Net InventoryNet	171543000	USD
CY2018Q4	us-gaap	Inventory Net InventoryNet	125470000	USD
CY2019Q3	us-gaap	Other Assets Current OtherAssetsCurrent	113502000	USD
CY2018Q4	us-gaap	Other Assets Current OtherAssetsCurrent	75749000	USD
CY2019Q3	us-gaap	Assets Current AssetsCurrent	866969000	USD
CY2018Q4	us-gaap	Assets Current AssetsCurrent	878783000	USD
CY2019Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	889295000	USD
CY2018Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	183514000	USD
CY2019Q3	us-gaap	Debt Current DebtCurrent	11925000	USD
CY2018Q4	us-gaap	Debt Current DebtCurrent	17797000	USD
CY2019Q3	us-gaap	Liabilities Current LiabilitiesCurrent	339993000	USD
CY2018Q4	us-gaap	Liabilities Current LiabilitiesCurrent	329335000	USD
CY2019Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	292781000	USD
CY2018Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	300186000	USD
CY2019Q3	us-gaap	Mine Reclamation And Closing Liability Noncurrent MineReclamationAndClosingLiabilityNoncurrent	238440000	USD
CY2018Q4	us-gaap	Mine Reclamation And Closing Liability Noncurrent MineReclamationAndClosingLiabilityNoncurrent	230304000	USD
CY2019Q3	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	12491000	USD
CY2018Q4	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	16147000	USD
CY2019Q3	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent	78308000	USD
CY2018Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent	83163000	USD
CY2019Q3	us-gaap	Workers Compensation Liability Noncurrent WorkersCompensationLiabilityNoncurrent	174118000	USD
CY2018Q4	us-gaap	Workers Compensation Liability Noncurrent WorkersCompensationLiabilityNoncurrent	174303000	USD
CY2019Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	93033000	USD
CY2018Q4	us-gaap	Common Stock Value CommonStockValue	250000	USD
CY2018Q4	us-gaap	Liabilities Liabilities	1182239000	USD
CY2019Q3	us-gaap	Common Stock Value CommonStockValue	250000	USD
CY2019Q3	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	734829000	USD
CY2018Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	717492000	USD
CY2019Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	746928000	USD
CY2018Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	527666000	USD
CY2019Q3	us-gaap	Treasury Stock Value TreasuryStockValue	816882000	USD
CY2018Q4	us-gaap	Treasury Stock Value TreasuryStockValue	583883000	USD
CY2019Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	40311000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	43296000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	705436000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	704821000	USD
CY2019Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1934600000	USD
CY2018Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1887060000	USD
	us-gaap	Net Income Loss NetIncomeLoss	242350000	USD
	us-gaap	Net Income Loss NetIncomeLoss	226483000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	82199000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	92027000	USD
	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	15411000	USD
	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	20977000	USD
	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	-77000	USD
	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	9540000	USD
	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-13680000	USD
	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	22999000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	17305000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	12161000	USD
	us-gaap	Discontinued Operation Gain Loss From Disposal Of Discontinued Operation Before Income Tax DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax	818000	USD
	us-gaap	Discontinued Operation Gain Loss From Disposal Of Discontinued Operation Before Income Tax DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax	54000	USD
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-485000	USD
	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	2757000	USD
	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	3300000	USD
	us-gaap	Gain Loss Related To Litigation Settlement GainLossRelatedToLitigationSettlement	39000000	USD
	us-gaap	Gain Loss Related To Litigation Settlement GainLossRelatedToLitigationSettlement	0	USD
	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	4622000	USD
	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	5983000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	46073000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	34918000	USD
	us-gaap	Increase Decrease In Other Accounts Payable And Accrued Liabilities IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities	1569000	USD
	us-gaap	Increase Decrease In Other Accounts Payable And Accrued Liabilities IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities	-24762000	USD
	us-gaap	Increase Decrease In Income Taxes Payable Net Of Income Taxes Receivable IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable	32440000	USD
	us-gaap	Increase Decrease In Income Taxes Payable Net Of Income Taxes Receivable IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable	-1942000	USD
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-16932000	USD
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	8200000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	334053000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	266115000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	137396000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	55742000	USD
	us-gaap	Payments To Acquire Royalty Interests In Mining Properties PaymentsToAcquireRoyaltyInterestsInMiningProperties	1187000	USD
	us-gaap	Payments To Acquire Royalty Interests In Mining Properties PaymentsToAcquireRoyaltyInterestsInMiningProperties	522000	USD
	aci	Proceedsfromconsiderationpaidfordisposalsanddivestitures Proceedsfromconsiderationpaidfordisposalsanddivestitures	1799000	USD
	aci	Proceedsfromconsiderationpaidfordisposalsanddivestitures Proceedsfromconsiderationpaidfordisposalsanddivestitures	512000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	158578000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	140097000	USD
	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	146170000	USD
	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	133400000	USD
	aci	Purchases Of Investments Advances To Affiliates PurchasesOfInvestmentsAdvancesToAffiliates	4810000	USD
	aci	Purchases Of Investments Advances To Affiliates PurchasesOfInvestmentsAdvancesToAffiliates	1817000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-154002000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-64266000	USD
	us-gaap	Proceeds From Repayments Of Other Long Term Debt ProceedsFromRepaymentsOfOtherLongTermDebt	-2250000	USD
	us-gaap	Proceeds From Repayments Of Other Long Term Debt ProceedsFromRepaymentsOfOtherLongTermDebt	-2250000	USD
	us-gaap	Proceeds From Repayments Of Other Debt ProceedsFromRepaymentsOfOtherDebt	-12077000	USD
	us-gaap	Proceeds From Repayments Of Other Debt ProceedsFromRepaymentsOfOtherDebt	-10286000	USD
	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	0	USD
	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	1009000	USD
	us-gaap	Payments Of Debt Restructuring Costs PaymentsOfDebtRestructuringCosts	0	USD
	us-gaap	Payments Of Debt Restructuring Costs PaymentsOfDebtRestructuringCosts	50000	USD
	us-gaap	Payments Of Ordinary Dividends PaymentsOfOrdinaryDividends	22264000	USD
	us-gaap	Payments Of Ordinary Dividends PaymentsOfOrdinaryDividends	23966000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	232999000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	192221000	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	30000	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	10000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-269560000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-229772000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-89509000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-27923000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	264937000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	273602000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	175428000	USD
CY2018Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	245679000	USD
CY2019Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	175428000	USD
CY2018Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	245679000	USD
CY2019Q3	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	0	USD
CY2018Q3	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	0	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	175428000	USD
CY2018Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	245679000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	704821000	USD
CY2019Q1	us-gaap	Dividends Dividends	8111000	USD
CY2019Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	75835000	USD
CY2019Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	5651000	USD
CY2019Q1	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	78249000	USD
CY2019Q1	us-gaap	Stockholders Equity StockholdersEquity	699947000	USD
CY2019Q2	us-gaap	Dividends Dividends	7696000	USD
CY2019Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	63238000	USD
CY2019Q2	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	5822000	USD
CY2019Q2	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	63392000	USD
CY2019Q2	us-gaap	Adjustments To Additional Paid In Capital Warrant Issued AdjustmentsToAdditionalPaidInCapitalWarrantIssued	31000	USD
CY2019Q2	us-gaap	Stockholders Equity StockholdersEquity	697950000	USD
CY2019Q3	us-gaap	Dividends Dividends	7281000	USD
CY2019Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	100292000	USD
CY2019Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	5833000	USD
CY2019Q3	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	91358000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	705436000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	665865000	USD
CY2018Q1	us-gaap	Dividends Dividends	8553000	USD
CY2018Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	65884000	USD
CY2018Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	3845000	USD
CY2018Q1	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	38589000	USD
CY2018Q1	us-gaap	Adjustments To Additional Paid In Capital Warrant Issued AdjustmentsToAdditionalPaidInCapitalWarrantIssued	10000	USD
CY2018Q1	us-gaap	Stockholders Equity StockholdersEquity	688462000	USD
CY2018Q2	us-gaap	Dividends Dividends	8217000	USD
CY2018Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	34843000	USD
CY2018Q2	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	4147000	USD
CY2018Q2	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	78287000	USD
CY2018Q2	us-gaap	Adjustments To Additional Paid In Capital Warrant Issued AdjustmentsToAdditionalPaidInCapitalWarrantIssued	0	USD
CY2018Q2	us-gaap	Stockholders Equity StockholdersEquity	640948000	USD
CY2018Q3	us-gaap	Dividends Dividends	7823000	USD
CY2018Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	126094000	USD
CY2018Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	4168000	USD
CY2018Q3	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	76247000	USD
CY2018Q3	us-gaap	Stockholders Equity StockholdersEquity	687140000	USD
CY2019Q3	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	1700000	USD
CY2018Q4	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	600000	USD
	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	6184000	USD
	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	9169000	USD
CY2019Q3	us-gaap	Energy Related Inventory Coal EnergyRelatedInventoryCoal	79746000	USD
CY2018Q4	us-gaap	Energy Related Inventory Coal EnergyRelatedInventoryCoal	40982000	USD
CY2019Q3	us-gaap	Inventory Parts And Components Net Of Reserves InventoryPartsAndComponentsNetOfReserves	91797000	USD
CY2018Q4	us-gaap	Inventory Parts And Components Net Of Reserves InventoryPartsAndComponentsNetOfReserves	84488000	USD
CY2019Q3	us-gaap	Inventory Net InventoryNet	171543000	USD
CY2018Q4	us-gaap	Inventory Net InventoryNet	125470000	USD
CY2019Q3	us-gaap	Interest Rate Cash Flow Hedge Gain Loss To Be Reclassified During Next12 Months Net InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet	3100000	USD
CY2019Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	175847000	USD
CY2019Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	327000	USD
CY2019Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	118000	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	176056000	USD
CY2018Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	163140000	USD
CY2018Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	15000	USD
CY2018Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	358000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	162797000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	51700000	USD
CY2018Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	115200000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	0.0	USD
CY2018Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	32400000	USD
CY2019Q3	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	42646000	USD
CY2019Q3	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	33292000	USD
CY2018Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	18879000	USD
CY2018Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	31089000	USD
CY2019Q3	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	32663000	USD
CY2019Q3	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	32663000	USD
CY2018Q4	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	17801000	USD
CY2018Q4	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	17801000	USD
CY2019Q3	aci	Derivative Asset Excluding Interest Rate Swaps DerivativeAssetExcludingInterestRateSwaps	9983000	USD
CY2019Q3	us-gaap	Derivative Liabilities DerivativeLiabilities	629000	USD
CY2019Q3	us-gaap	Derivative Assets Liabilities At Fair Value Net DerivativeAssetsLiabilitiesAtFairValueNet	9354000	USD
CY2018Q4	aci	Derivative Asset Excluding Interest Rate Swaps DerivativeAssetExcludingInterestRateSwaps	1078000	USD
CY2018Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	13288000	USD
CY2018Q4	us-gaap	Derivative Assets Liabilities At Fair Value Net DerivativeAssetsLiabilitiesAtFairValueNet	-12210000	USD
CY2019Q3	us-gaap	Derivative Assets Liabilities At Fair Value Net DerivativeAssetsLiabilitiesAtFairValueNet	9354000	USD
CY2018Q4	us-gaap	Derivative Assets Liabilities At Fair Value Net DerivativeAssetsLiabilitiesAtFairValueNet	-12210000	USD
CY2019Q3	us-gaap	Derivative Collateral Obligation To Return Cash DerivativeCollateralObligationToReturnCash	1900000	USD
CY2018Q4	us-gaap	Derivative Collateral Obligation To Return Cash DerivativeCollateralObligationToReturnCash	24700000	USD
CY2019Q3	aci	Change In Fair Value Of Coal Derivatives And Coal Trading Activities Net ChangeInFairValueOfCoalDerivativesAndCoalTradingActivitiesNet	1530000	USD
CY2018Q3	aci	Change In Fair Value Of Coal Derivatives And Coal Trading Activities Net ChangeInFairValueOfCoalDerivativesAndCoalTradingActivitiesNet	10418000	USD
	aci	Change In Fair Value Of Coal Derivatives And Coal Trading Activities Net ChangeInFairValueOfCoalDerivativesAndCoalTradingActivitiesNet	-19851000	USD
	aci	Change In Fair Value Of Coal Derivatives And Coal Trading Activities Net ChangeInFairValueOfCoalDerivativesAndCoalTradingActivitiesNet	22142000	USD
CY2019Q3	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	49566000	USD
CY2018Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	57166000	USD
CY2019Q3	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	71738000	USD
CY2018Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	75017000	USD
CY2019Q3	us-gaap	Interest Payable Current InterestPayableCurrent	131000	USD
CY2018Q4	us-gaap	Interest Payable Current InterestPayableCurrent	156000	USD
CY2019Q3	aci	Coal Supply Agreement Liability CoalSupplyAgreementLiability	203000	USD
CY2018Q4	aci	Coal Supply Agreement Liability CoalSupplyAgreementLiability	570000	USD
CY2019Q3	us-gaap	Workers Compensation Liability Current WorkersCompensationLiabilityCurrent	18053000	USD
CY2018Q4	us-gaap	Workers Compensation Liability Current WorkersCompensationLiabilityCurrent	20044000	USD
CY2019Q3	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	12297000	USD
CY2018Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	13113000	USD
CY2019Q3	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	9951000	USD
CY2018Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	17448000	USD
CY2019Q3	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	161939000	USD
CY2018Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	183514000	USD
CY2019Q3	us-gaap	Loans Payable To Bank LoansPayableToBank	291524000	USD
CY2018Q4	us-gaap	Loans Payable To Bank LoansPayableToBank	293626000	USD
CY2019Q3	us-gaap	Other Long Term Debt OtherLongTermDebt	18471000	USD
CY2018Q4	us-gaap	Other Long Term Debt OtherLongTermDebt	30449000	USD
CY2019Q3	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	5289000	USD
CY2018Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	6092000	USD
CY2019Q3	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	304706000	USD
CY2018Q4	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	317983000	USD
CY2019Q3	us-gaap	Debt Current DebtCurrent	11925000	USD
CY2018Q4	us-gaap	Debt Current DebtCurrent	17797000	USD
CY2019Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	292781000	USD
CY2018Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	300186000	USD
CY2019Q3	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	22494000	USD
CY2018Q3	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	16375000	USD
	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	51000000	USD
	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	37245000	USD
CY2019Q3	us-gaap	Income Tax Reconciliation Nondeductible Expense Depletion IncomeTaxReconciliationNondeductibleExpenseDepletion	-6347000	USD
CY2018Q3	us-gaap	Income Tax Reconciliation Nondeductible Expense Depletion IncomeTaxReconciliationNondeductibleExpenseDepletion	-5964000	USD
	us-gaap	Income Tax Reconciliation Nondeductible Expense Depletion IncomeTaxReconciliationNondeductibleExpenseDepletion	-14111000	USD
	us-gaap	Income Tax Reconciliation Nondeductible Expense Depletion IncomeTaxReconciliationNondeductibleExpenseDepletion	-13059000	USD
CY2019Q3	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1825000	USD
CY2018Q3	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	4528000	USD
	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	3668000	USD
	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	5865000	USD
CY2019Q3	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-19120000	USD
CY2018Q3	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-44278000	USD
	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-42925000	USD
	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-62234000	USD
CY2019Q3	us-gaap	Income Tax Reconciliation Tax Settlements IncomeTaxReconciliationTaxSettlements	1495000	USD
CY2018Q3	us-gaap	Income Tax Reconciliation Tax Settlements IncomeTaxReconciliationTaxSettlements	511000	USD
	us-gaap	Income Tax Reconciliation Tax Settlements IncomeTaxReconciliationTaxSettlements	2932000	USD
	us-gaap	Income Tax Reconciliation Tax Settlements IncomeTaxReconciliationTaxSettlements	-599000	USD
CY2019Q3	us-gaap	Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of2017 Amount EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Amount	0	USD
CY2018Q3	us-gaap	Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of2017 Amount EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Amount	-19780000	USD
	us-gaap	Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of2017 Amount EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Amount	0	USD
	us-gaap	Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of2017 Amount EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Amount	-19780000	USD
CY2019Q3	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	0	USD
CY2018Q3	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	3393000	USD
	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-56000	USD
	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	3437000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	347000	USD
CY2018Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-45215000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	508000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-49125000	USD
CY2018Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-45200000	USD
CY2018Q3	us-gaap	Unrecognized Tax Benefits Period Increase Decrease UnrecognizedTaxBenefitsPeriodIncreaseDecrease	-24900000	USD
CY2019Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	755000	USD
CY2018Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	532000	USD
CY2019Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	-1252000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	-1794000	USD
CY2019Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	562000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	1562000	USD
CY2019Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Issues FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues	45000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Issues FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues	45000	USD
CY2019Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	422000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	187000	USD
CY2019Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	442000	USD
CY2019Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	442000	USD
CY2019Q3	us-gaap	Debt Instrument Fair Value DebtInstrumentFairValue	306900000	USD
CY2018Q4	us-gaap	Debt Instrument Fair Value DebtInstrumentFairValue	318600000	USD
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	15736000	shares
CY2018Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	19250000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	16591000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	20102000	shares
CY2019Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	1116000	shares
CY2018Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	958000	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	1153000	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	938000	shares
CY2019Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	16852000	shares
CY2018Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	20208000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	17744000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	21040000	shares
CY2018Q3	us-gaap	Assets Assets	1997622000	USD
	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	Segment
CY2019Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	619467000	USD
CY2019Q3	aci	Adjusted Ebitda AdjustedEBITDA	106621000	USD
CY2019Q3	aci	Depreciation Depletionand Amortization Productionand Nonproduction DepreciationDepletionandAmortizationProductionandNonproduction	30402000	USD
CY2019Q3	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	5137000	USD
CY2019Q3	us-gaap	Assets Assets	1934600000	USD
CY2019Q3	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	49452000	USD
CY2018Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	633180000	USD
CY2018Q3	aci	Adjusted Ebitda AdjustedEBITDA	124894000	USD
CY2018Q3	aci	Depreciation Depletionand Amortization Productionand Nonproduction DepreciationDepletionandAmortizationProductionandNonproduction	31775000	USD
CY2018Q3	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	6992000	USD
CY2018Q3	us-gaap	Assets Assets	1997622000	USD
CY2018Q3	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	25693000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1744872000	USD
	aci	Adjusted Ebitda AdjustedEBITDA	319439000	USD
	aci	Depreciation Depletionand Amortization Productionand Nonproduction DepreciationDepletionandAmortizationProductionandNonproduction	82199000	USD
	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	15411000	USD
CY2019Q3	us-gaap	Assets Assets	1934600000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	137396000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1800824000	USD
	aci	Adjusted Ebitda AdjustedEBITDA	315192000	USD
	aci	Depreciation Depletionand Amortization Productionand Nonproduction DepreciationDepletionandAmortizationProductionandNonproduction	92027000	USD
	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	20977000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	55742000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	106769000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	123192000	USD
	us-gaap	Net Income Loss NetIncomeLoss	242350000	USD
	us-gaap	Net Income Loss NetIncomeLoss	226483000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	347000	USD
CY2018Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-45215000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	508000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-49125000	USD
CY2019Q3	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-340000	USD
CY2018Q3	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-3378000	USD
	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-4916000	USD
	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-10998000	USD
CY2019Q3	aci	Depreciation Depletionand Amortization Productionand Nonproduction DepreciationDepletionandAmortizationProductionandNonproduction	30402000	USD
CY2018Q3	aci	Depreciation Depletionand Amortization Productionand Nonproduction DepreciationDepletionandAmortizationProductionandNonproduction	31775000	USD
	aci	Depreciation Depletionand Amortization Productionand Nonproduction DepreciationDepletionandAmortizationProductionandNonproduction	82199000	USD
	aci	Depreciation Depletionand Amortization Productionand Nonproduction DepreciationDepletionandAmortizationProductionandNonproduction	92027000	USD
CY2019Q3	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	5137000	USD
CY2018Q3	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	6992000	USD
	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	15411000	USD
	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	20977000	USD
CY2019Q3	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	-153000	USD
CY2018Q3	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	3241000	USD
	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	-77000	USD
	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	9540000	USD
CY2019Q3	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	0	USD
CY2018Q3	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	0	USD
	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	-4304000	USD
	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	0	USD
CY2019Q3	us-gaap	Gain Loss Related To Litigation Settlement GainLossRelatedToLitigationSettlement	39000000	USD
CY2018Q3	us-gaap	Gain Loss Related To Litigation Settlement GainLossRelatedToLitigationSettlement	0	USD
	us-gaap	Gain Loss Related To Litigation Settlement GainLossRelatedToLitigationSettlement	39000000	USD
	us-gaap	Gain Loss Related To Litigation Settlement GainLossRelatedToLitigationSettlement	0	USD
CY2019Q3	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2018Q3	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-485000	USD
CY2019Q3	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	-975000	USD
CY2018Q3	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	971000	USD
	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	2127000	USD
	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	2206000	USD
CY2019Q3	us-gaap	Nondebtor Reorganization Items Net Gain Loss On Settlement Of Other Claims1 NondebtorReorganizationItemsNetGainLossOnSettlementOfOtherClaims1	0	USD
CY2018Q3	us-gaap	Nondebtor Reorganization Items Net Gain Loss On Settlement Of Other Claims1 NondebtorReorganizationItemsNetGainLossOnSettlementOfOtherClaims1	-560000	USD
	us-gaap	Nondebtor Reorganization Items Net Gain Loss On Settlement Of Other Claims1 NondebtorReorganizationItemsNetGainLossOnSettlementOfOtherClaims1	71000	USD
	us-gaap	Nondebtor Reorganization Items Net Gain Loss On Settlement Of Other Claims1 NondebtorReorganizationItemsNetGainLossOnSettlementOfOtherClaims1	-1601000	USD
CY2019Q3	aci	Operating Income Expense Relatedto Joint Venture OperatingIncomeExpenseRelatedtoJointVenture	-3754000	USD
CY2018Q3	aci	Operating Income Expense Relatedto Joint Venture OperatingIncomeExpenseRelatedtoJointVenture	0	USD
	aci	Operating Income Expense Relatedto Joint Venture OperatingIncomeExpenseRelatedtoJointVenture	-6772000	USD
	aci	Operating Income Expense Relatedto Joint Venture OperatingIncomeExpenseRelatedtoJointVenture	0	USD
CY2019Q3	aci	Adjusted Ebitda AdjustedEBITDA	106621000	USD
CY2018Q3	aci	Adjusted Ebitda AdjustedEBITDA	124894000	USD
	aci	Adjusted Ebitda AdjustedEBITDA	319439000	USD
	aci	Adjusted Ebitda AdjustedEBITDA	315192000	USD
CY2019Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	619467000	USD
CY2018Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	633180000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1744872000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1800824000	USD
CY2019Q3	aci	Revenue Remaining Performance Obligation Fixed Price Volume RevenueRemainingPerformanceObligationFixedPriceVolume	17300000
CY2019Q3	aci	Revenue Remaining Performance Obligation Variable Price Volume RevenueRemainingPerformanceObligationVariablePriceVolume	1800000
CY2019Q3	aci	Revenue Remaining Performance Obligation Fixed Price Volume RevenueRemainingPerformanceObligationFixedPriceVolume	96800000
CY2019Q3	aci	Revenue Remaining Performance Obligation Variable Price Volume RevenueRemainingPerformanceObligationVariablePriceVolume	6000000.0
	us-gaap	Operating Lease Cost OperatingLeaseCost	1071000	USD
	us-gaap	Operating Lease Payments OperatingLeasePayments	1078000	USD
CY2019Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.055
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	1024000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	3616000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	3367000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	3292000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	3261000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	11153000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	25713000	USD
CY2019Q3	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	4725000	USD
CY2019Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	20988000	USD
CY2019Q3	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	2713000	USD
CY2019Q3	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	18275000	USD
CY2019Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	20988000	USD
CY2019Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	20300000	USD

Files In Submission

Name	View Source	Status
0001628280-19-012459-index-headers.html	Edgar Link	pending
0001628280-19-012459-index.html	Edgar Link	pending
0001628280-19-012459.txt	Edgar Link	pending
0001628280-19-012459-xbrl.zip	Edgar Link	pending
aci-20190930.xsd	Edgar Link	pending
aci-20190930x10q.htm	Edgar Link	pending
aci-20190930x10q_htm.xml	Edgar Link	completed
aci-20190930xex311.htm	Edgar Link	pending
aci-20190930xex312.htm	Edgar Link	pending
aci-20190930xex321.htm	Edgar Link	pending
aci-20190930xex322.htm	Edgar Link	pending
aci-20190930xex95.htm	Edgar Link	pending
aci-20190930_cal.xml	Edgar Link	unprocessable
aci-20190930_def.xml	Edgar Link	unprocessable
aci-20190930_lab.xml	Edgar Link	unprocessable
aci-20190930_pre.xml	Edgar Link	unprocessable
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
logoa02a01a01a01a01a17.jpg	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
R1.htm	Edgar Link	pending
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R9999.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$ARCH
ARCH RESOURCES, INC. Stock $arch

2019 Q4 Form 10-Q Financial Statement

#000162828019012459 Filed on October 22, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ARCH ARCH RESOURCES, INC. Stock $arch

2019 Q4 Form 10-Q Financial Statement

#000162828019012459 Filed on October 22, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ARCH
ARCH RESOURCES, INC. Stock $arch