$ARCH
ARCH RESOURCES, INC. Stock $arch

$arch Overview Financials Valuation SEC Filings Company Website

2018 Q4 Form 10-Q Financial Statement

#000162828018012798 Filed on October 23, 2018

Income Statement

Concept	2018 Q4	2018 Q3	2017 Q4
Revenue	$651.0M	$633.2M	$560.2M
YoY Change	16.19%	3.2%	-2.68%
Cost Of Revenue	$514.0M	$482.0M	$450.7M
YoY Change	14.04%	-2.5%	-4.17%
Gross Profit	$101.4M	$109.7M	$63.46M
YoY Change	59.78%	65.91%	-39.77%
Gross Profit Margin	15.58%	17.33%	11.33%
Selling, General & Admin	$26.70M	$22.91M	$23.40M
YoY Change	14.1%	7.6%	0.89%
% of Gross Profit	26.33%	20.88%	36.87%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$27.60M	$31.70M	$28.00M
YoY Change	-1.43%	-0.63%	-14.12%
% of Gross Profit	27.22%	28.89%	44.12%
Operating Expenses	$63.40M	$550.3M	$53.60M
YoY Change	18.28%	1.86%	-89.88%
Operating Profit	$86.49M	$82.89M	$51.12M
YoY Change	69.2%	13.06%	10.92%
Interest Expense	$10.30M	$5.179M	-$9.400M
YoY Change	-209.57%	-13.28%	-183.62%
% of Operating Profit	11.91%	6.25%	-18.39%
Other Income/Expense, Net	-$1.000M	-$1.531M	-$200.0K
YoY Change	400.0%	13.41%	-72.49%
Pretax Income	$82.70M	$77.98M	$46.50M
YoY Change	77.85%	16.89%	34.37%
Income Tax	-$3.400M	-$45.22M	-$367.2M
% Of Pretax Income	-4.11%	-57.99%	-789.68%
Net Earnings	$86.09M	$123.2M	$81.27M
YoY Change	5.93%	80.23%	142.97%
Net Earnings / Revenue	13.23%	19.46%	14.51%
Basic Earnings Per Share		$6.40
Diluted Earnings Per Share	$4.44	$6.10	$3.64
COMMON SHARES
Basic Shares Outstanding	18.80M shares	19.25M shares	21.93M shares
Diluted Shares Outstanding		20.21M shares

Balance Sheet

Concept	2018 Q4	2018 Q3	2017 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$427.7M	$408.2M	$429.2M
YoY Change	-0.35%	-9.88%	48.75%
Cash & Equivalents	$264.9M	$245.7M	$273.4M
Short-Term Investments	$162.8M	$162.5M	$155.8M
Other Short-Term Assets	$75.75M	$95.04M	$70.43M
YoY Change	7.56%	49.23%	-26.87%
Inventory	$125.5M	$163.9M	$129.0M
Prepaid Expenses
Receivables	$200.9M	$183.3M	$172.6M
Other Receivables	$49.00M	$27.00M	$29.00M
Total Short-Term Assets	$878.8M	$877.4M	$831.0M
YoY Change	5.75%	0.9%	-5.42%
LONG-TERM ASSETS
Property, Plant & Equipment	$834.8M	$919.6M	$955.9M
YoY Change	-12.67%	-6.24%	-9.27%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$104.7M	$105.3M	$106.1M
YoY Change	-1.35%	-0.8%	10.41%
Other Assets	$68.00M	$95.27M	$59.78M
YoY Change	13.75%	44.49%	-44.8%
Total Long-Term Assets	$173.4M	$200.6M	$192.7M
YoY Change	-9.99%	16.55%	-5.72%
TOTAL ASSETS
Total Short-Term Assets	$878.8M	$877.4M	$831.0M
Total Long-Term Assets	$173.4M	$200.6M	$192.7M
Total Assets	$1.887B	$1.998B	$1.980B
YoY Change	-4.68%	-1.23%	-7.35%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$128.0M	$119.6M	$134.1M
YoY Change	-4.56%	-13.1%	39.79%
Accrued Expenses	$183.5M	$203.7M	$184.2M
YoY Change	-0.35%	23.48%	-10.27%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$18.00M	$11.00M	$16.00M
YoY Change	12.5%	22.22%	45.45%
Total Short-Term Liabilities	$329.3M	$334.8M	$334.1M
YoY Change	-1.42%	7.59%	7.0%
LONG-TERM LIABILITIES
Long-Term Debt	$300.2M	$302.8M	$310.1M
YoY Change	-3.21%	-3.13%	-11.85%
Other Long-Term Liabilities	$48.80M	$61.90M	$59.46M
YoY Change	-17.92%	-19.54%	-6.84%
Total Long-Term Liabilities	$349.0M	$364.7M	$369.6M
YoY Change	-5.57%	-6.37%	-11.08%
TOTAL LIABILITIES
Total Short-Term Liabilities	$329.3M	$334.8M	$334.1M
Total Long-Term Liabilities	$349.0M	$364.7M	$369.6M
Total Liabilities	$1.182B	$1.310B	$1.314B
YoY Change	-10.01%	-2.93%	-5.49%
SHAREHOLDERS EQUITY
Retained Earnings	$527.7M	$449.1M	$247.2M
YoY Change	113.43%	158.6%	639.13%
Common Stock	$717.7M	$712.5M	$700.4M
YoY Change	2.48%	2.15%	1.7%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$583.9M	$495.2M	$302.1M
YoY Change	93.27%	127.45%
Treasury Stock Shares	7.216M shares	6.215M shares	3.977M shares
Shareholders Equity	$704.8M	$687.1M	$665.9M
YoY Change
Total Liabilities & Shareholders Equity	$1.887B	$1.998B	$1.980B
YoY Change	-4.68%	-1.23%	-7.35%

Cashflow Statement

Concept	2018 Q4	2018 Q3	2017 Q4
OPERATING ACTIVITIES
Net Income	$86.09M	$123.2M	$81.27M
YoY Change	5.93%	80.23%	142.97%
Depreciation, Depletion And Amortization	$27.60M	$31.70M	$28.00M
YoY Change	-1.43%	-0.63%	-14.12%
Cash From Operating Activities	$151.9M	$121.1M	$94.40M
YoY Change	60.91%	19.55%	12.12%
INVESTING ACTIVITIES
Capital Expenditures	-$39.60M	$25.69M	-$29.00M
YoY Change	36.55%	89.18%	-290.61%
Acquisitions
YoY Change
Other Investing Activities	-$100.0K	-$2.800M	-$1.000M
YoY Change	-90.0%	-123.33%	-116.13%
Cash From Investing Activities	-$39.70M	-$29.00M	-$29.90M
YoY Change	32.78%	1060.0%	-500.16%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-92.90M	-88.10M	-89.10M
YoY Change	4.26%	-49.91%	-3389.04%
NET CHANGE
Cash From Operating Activities	151.9M	121.1M	94.40M
Cash From Investing Activities	-39.70M	-29.00M	-29.90M
Cash From Financing Activities	-92.90M	-88.10M	-89.10M
Net Change In Cash	19.30M	4.000M	-24.60M
YoY Change	-178.46%	-105.19%	-126.07%
FREE CASH FLOW
Cash From Operating Activities	$151.9M	$121.1M	$94.40M
Capital Expenditures	-$39.60M	$25.69M	-$29.00M
Free Cash Flow	$191.5M	$95.41M	$123.4M
YoY Change	55.19%	8.76%	78.9%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2017Q3	aci	Adjusted Ebitda AdjustedEBITDA	105091000	USD
	aci	Adjusted Ebitda AdjustedEBITDA	321910000	USD
CY2018Q3	aci	Adjusted Ebitda AdjustedEBITDA	124894000	USD
	aci	Adjusted Ebitda AdjustedEBITDA	315192000	USD
CY2017Q3	aci	Change In Fair Value Of Coal Derivatives And Coal Trading Activities Net ChangeInFairValueOfCoalDerivativesAndCoalTradingActivitiesNet	1028000	USD
	aci	Change In Fair Value Of Coal Derivatives And Coal Trading Activities Net ChangeInFairValueOfCoalDerivativesAndCoalTradingActivitiesNet	2745000	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	22142000	USD
CY2017Q4	aci	Coal Supply Agreement Gross Obligation Liability CoalSupplyAgreementGrossObligationLiability	31742000	USD
CY2018Q3	aci	Coal Supply Agreement Gross Obligation Liability CoalSupplyAgreementGrossObligationLiability	31742000	USD
CY2017Q4	aci	Coal Supply Agreement Liability CoalSupplyAgreementLiability	934000	USD
CY2018Q3	aci	Coal Supply Agreement Liability CoalSupplyAgreementLiability	562000	USD
CY2017Q4	aci	Coal Supply Agreement Obligation Net CoalSupplyAgreementObligationNet	1763000	USD
CY2018Q3	aci	Coal Supply Agreement Obligation Net CoalSupplyAgreementObligationNet	959000	USD
CY2017Q3	aci	Depreciation Depletionand Amortization Productionand Nonproduction DepreciationDepletionandAmortizationProductionandNonproduction	31914000	USD
	aci	Depreciation Depletionand Amortization Productionand Nonproduction DepreciationDepletionandAmortizationProductionandNonproduction	94536000	USD
CY2018Q3	aci	Depreciation Depletionand Amortization Productionand Nonproduction DepreciationDepletionandAmortizationProductionandNonproduction	31775000	USD
	aci	Depreciation Depletionand Amortization Productionand Nonproduction DepreciationDepletionandAmortizationProductionandNonproduction	92027000	USD
CY2017Q4	aci	Derivative Asset Excluding Interest Rate Swaps DerivativeAssetExcludingInterestRateSwaps	5508000	USD
CY2018Q3	aci	Derivative Asset Excluding Interest Rate Swaps DerivativeAssetExcludingInterestRateSwaps	7675000	USD
CY2017Q3	aci	Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of2017 Amount EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Amount	0	USD
	aci	Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of2017 Amount EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Amount	0	USD
CY2018Q3	aci	Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of2017 Amount EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Amount	-19780000	USD
	aci	Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of2017 Amount EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Amount	-19780000	USD
CY2017Q4	aci	Finite Lived Coal Supply Agreements Gross FiniteLivedCoalSupplyAgreementsGross	97196000	USD
CY2018Q3	aci	Finite Lived Coal Supply Agreements Gross FiniteLivedCoalSupplyAgreementsGross	97196000	USD
CY2017Q4	aci	Finite Lived Intangible Liabilities Accumulated Amortization FiniteLivedIntangibleLiabilitiesAccumulatedAmortization	29979000	USD
CY2018Q3	aci	Finite Lived Intangible Liabilities Accumulated Amortization FiniteLivedIntangibleLiabilitiesAccumulatedAmortization	30783000	USD
CY2017Q4	aci	Net Total Of Acquired Sales Contracts Assets NetTotalOfAcquiredSalesContractsAssets	10673000	USD
CY2018Q3	aci	Net Total Of Acquired Sales Contracts Assets NetTotalOfAcquiredSalesContractsAssets	1133000	USD
CY2017Q3	aci	Paymentsfor Reorganization Items PaymentsforReorganizationItems	200000	USD
	aci	Paymentsfor Reorganization Items PaymentsforReorganizationItems	4800000	USD
CY2018Q3	aci	Paymentsfor Reorganization Items PaymentsforReorganizationItems	600000	USD
	aci	Paymentsfor Reorganization Items PaymentsforReorganizationItems	1200000	USD
	aci	Proceedsfromconsiderationpaidfordisposalsanddivestitures Proceedsfromconsiderationpaidfordisposalsanddivestitures	11432000	USD
	aci	Proceedsfromconsiderationpaidfordisposalsanddivestitures Proceedsfromconsiderationpaidfordisposalsanddivestitures	512000	USD
	aci	Purchases Of Investments Advances To Affiliates PurchasesOfInvestmentsAdvancesToAffiliates	9216000	USD
	aci	Purchases Of Investments Advances To Affiliates PurchasesOfInvestmentsAdvancesToAffiliates	1817000	USD
CY2018Q3	aci	Revenue Remaining Performance Obligation Fixed Price Volume RevenueRemainingPerformanceObligationFixedPriceVolume	18500000
CY2018Q3	aci	Revenue Remaining Performance Obligation Fixed Price Volume RevenueRemainingPerformanceObligationFixedPriceVolume	80400000
CY2018Q3	aci	Revenue Remaining Performance Obligation Variable Price Volume RevenueRemainingPerformanceObligationVariablePriceVolume	3000000
CY2018Q3	aci	Revenue Remaining Performance Obligation Variable Price Volume RevenueRemainingPerformanceObligationVariablePriceVolume	9800000
	dei	Amendment Flag AmendmentFlag	false
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2018
	dei	Document Period End Date DocumentPeriodEndDate	2018-09-30
	dei	Document Type DocumentType	10-Q
	dei	Entity Central Index Key EntityCentralIndexKey	0001037676
CY2018Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	18799400	shares
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Registrant Name EntityRegistrantName	ARCH COAL INC
	dei	Entity Small Business EntitySmallBusiness	false
CY2017Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	134137000	USD
CY2018Q3	us-gaap	Accounts Payable Current AccountsPayableCurrent	119629000	USD
CY2017Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	172604000	USD
CY2018Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	183318000	USD
CY2017Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	77017000	USD
CY2018Q3	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	72095000	USD
CY2017Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	184161000	USD
CY2018Q3	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	203667000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	20367000	USD
CY2018Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	20705000	USD
CY2017Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	700125000	USD
CY2018Q3	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	712295000	USD
	us-gaap	Amortization Of Advance Royalty AmortizationOfAdvanceRoyalty	2905000	USD
	us-gaap	Amortization Of Advance Royalty AmortizationOfAdvanceRoyalty	134000	USD
	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	2628000	USD
	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	3300000	USD
CY2017Q3	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	7580000	USD
	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	22826000	USD
CY2018Q3	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	6992000	USD
	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	20977000	USD
CY2017Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	19840000	USD
CY2018Q3	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	19840000	USD
CY2017Q3	us-gaap	Assets Assets	2022533000	USD
CY2017Q4	us-gaap	Assets Assets	1979632000	USD
CY2018Q3	us-gaap	Assets Assets	1997622000	USD
CY2017Q4	us-gaap	Assets Current AssetsCurrent	830994000	USD
CY2018Q3	us-gaap	Assets Current AssetsCurrent	877417000	USD
CY2018Q3	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	173814000	USD
CY2017Q4	us-gaap	Assets Noncurrent AssetsNoncurrent	192690000	USD
CY2018Q3	us-gaap	Assets Noncurrent AssetsNoncurrent	200592000	USD
CY2017Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	22000	USD
CY2018Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	1000	USD
CY2017Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	365000	USD
CY2018Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	380000	USD
CY2017Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	156189000	USD
CY2018Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	162909000	USD
CY2017Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	155846000	USD
CY2018Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	162530000	USD
CY2017Q4	us-gaap	Available For Sale Securities Debt Securities Current AvailableForSaleSecuritiesDebtSecuritiesCurrent	155846000	USD
CY2018Q3	us-gaap	Available For Sale Securities Debt Securities Current AvailableForSaleSecuritiesDebtSecuritiesCurrent	162530000	USD
CY2017Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	298337000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	273387000	USD
CY2018Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	245679000	USD
CY2016Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	376422000	USD
CY2017Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	298339000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	273602000	USD
CY2018Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	245679000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-78083000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-27923000	USD
CY2017Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.35
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.7
CY2018Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.4
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.2
CY2017Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2018Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2017Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	300000000	shares
CY2018Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	300000000	shares
CY2017Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	25047000	shares
CY2018Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	25047000	shares
CY2017Q4	us-gaap	Common Stock Value CommonStockValue	250000	USD
CY2018Q3	us-gaap	Common Stock Value CommonStockValue	250000	USD
CY2017Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	59811000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	151682000	USD
CY2018Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	126094000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	226821000	USD
CY2017Q3	us-gaap	Cost Of Goods Sold Excluding Depreciation Depletion And Amortization CostOfGoodsSoldExcludingDepreciationDepletionAndAmortization	494379000	USD
	us-gaap	Cost Of Goods Sold Excluding Depreciation Depletion And Amortization CostOfGoodsSoldExcludingDepreciationDepletionAndAmortization	1389294000	USD
CY2018Q3	us-gaap	Cost Of Goods Sold Excluding Depreciation Depletion And Amortization CostOfGoodsSoldExcludingDepreciationDepletionAndAmortization	482029000	USD
	us-gaap	Cost Of Goods Sold Excluding Depreciation Depletion And Amortization CostOfGoodsSoldExcludingDepreciationDepletionAndAmortization	1411197000	USD
CY2017Q4	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	325917000	USD
CY2018Q3	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	314308000	USD
CY2017Q4	us-gaap	Debt Current DebtCurrent	15783000	USD
CY2018Q3	us-gaap	Debt Current DebtCurrent	11478000	USD
CY2017Q4	us-gaap	Debt Instrument Fair Value DebtInstrumentFairValue	336100000	USD
CY2018Q3	us-gaap	Debt Instrument Fair Value DebtInstrumentFairValue	322600000	USD
CY2017Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	132000000	USD
CY2018Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	151600000	USD
CY2017Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	7032000	USD
CY2018Q3	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	6357000	USD
CY2017Q4	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	14036000	USD
CY2018Q3	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	5101000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	94536000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	92027000	USD
CY2017Q4	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	50042000	USD
CY2018Q3	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	42851000	USD
CY2018Q3	us-gaap	Derivative Assets DerivativeAssets	11284000	USD
CY2017Q4	us-gaap	Derivative Assets Liabilities At Fair Value Net DerivativeAssetsLiabilitiesAtFairValueNet	-1709000	USD
CY2018Q3	us-gaap	Derivative Assets Liabilities At Fair Value Net DerivativeAssetsLiabilitiesAtFairValueNet	-28880000	USD
CY2017Q4	us-gaap	Derivative Collateral Obligation To Return Cash DerivativeCollateralObligationToReturnCash	16200000	USD
CY2018Q3	us-gaap	Derivative Collateral Obligation To Return Cash DerivativeCollateralObligationToReturnCash	54600000	USD
CY2017Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	55550000	USD
CY2018Q3	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	50526000	USD
CY2017Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	57259000	USD
CY2018Q3	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	79406000	USD
CY2017Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	7217000	USD
CY2018Q3	us-gaap	Derivative Liabilities DerivativeLiabilities	36555000	USD
CY2017Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	7217000	USD
CY2018Q3	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	36555000	USD
CY2017Q4	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	50042000	USD
CY2018Q3	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	42851000	USD
	us-gaap	Discontinued Operation Gain Loss From Disposal Of Discontinued Operation Before Income Tax DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax	23006000	USD
	us-gaap	Discontinued Operation Gain Loss From Disposal Of Discontinued Operation Before Income Tax DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax	54000	USD
CY2017Q3	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	21574000	USD
	us-gaap	Disposal Group Not Discontinued Operation Gain Loss On Disposal DisposalGroupNotDiscontinuedOperationGainLossOnDisposal	21574000	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	0	USD
CY2017Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.90
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	6.44
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	6.40
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	11.27
CY2017Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.83
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	6.32
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	6.10
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	10.76
CY2017Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	53149000	USD
CY2018Q3	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	48961000	USD
CY2017Q4	us-gaap	Energy Related Inventory Coal EnergyRelatedInventoryCoal	54692000	USD
CY2018Q3	us-gaap	Energy Related Inventory Coal EnergyRelatedInventoryCoal	77497000	USD
CY2017Q4	us-gaap	Equity Method Investments EquityMethodInvestments	106107000	USD
CY2018Q3	us-gaap	Equity Method Investments EquityMethodInvestments	105325000	USD
CY2018Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	-749000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	-4402000	USD
CY2018Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Issues FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues	70000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Issues FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues	724000	USD
CY2018Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	825000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	2481000	USD
CY2018Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	2355000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	6353000	USD
CY2017Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	5426000	USD
CY2018Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	6083000	USD
CY2018Q3	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	5232000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	84760000	USD
CY2018Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	95104000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	12436000	USD
CY2018Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	2092000	USD
CY2017Q3	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-486000	USD
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-2547000	USD
CY2018Q3	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-485000	USD
CY2017Q3	us-gaap	Gross Profit GrossProfit	73310000	USD
	us-gaap	Gross Profit GrossProfit	183219000	USD
CY2018Q3	us-gaap	Gross Profit GrossProfit	82886000	USD
	us-gaap	Gross Profit GrossProfit	192648000	USD
CY2017Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	66708000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	156695000	USD
CY2018Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	77977000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	177358000	USD
CY2017Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-1643000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-484000	USD
CY2018Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-45200000	USD
CY2018Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-45215000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-49125000	USD
CY2017Q3	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-19118000	USD
	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-39336000	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	-62234000	USD
CY2017Q3	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	23347000	USD
	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	54843000	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	37245000	USD
CY2017Q3	us-gaap	Income Tax Reconciliation Nondeductible Expense Depletion IncomeTaxReconciliationNondeductibleExpenseDepletion	-7708000	USD
	us-gaap	Income Tax Reconciliation Nondeductible Expense Depletion IncomeTaxReconciliationNondeductibleExpenseDepletion	-20439000	USD
CY2018Q3	us-gaap	Income Tax Reconciliation Nondeductible Expense Depletion IncomeTaxReconciliationNondeductibleExpenseDepletion	-5964000	USD
	us-gaap	Income Tax Reconciliation Nondeductible Expense Depletion IncomeTaxReconciliationNondeductibleExpenseDepletion	-13059000	USD
CY2017Q3	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-19000	USD
	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	67000	USD
CY2018Q3	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	3393000	USD
	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	3437000	USD
CY2017Q3	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	728000	USD
	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1619000	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	5865000	USD
CY2017Q3	us-gaap	Income Tax Reconciliation Tax Settlements IncomeTaxReconciliationTaxSettlements	1127000	USD
	us-gaap	Income Tax Reconciliation Tax Settlements IncomeTaxReconciliationTaxSettlements	2762000	USD
CY2018Q3	us-gaap	Income Tax Reconciliation Tax Settlements IncomeTaxReconciliationTaxSettlements	511000	USD
	us-gaap	Income Tax Reconciliation Tax Settlements IncomeTaxReconciliationTaxSettlements	-599000	USD
	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-6069000	USD
	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	22999000	USD
	us-gaap	Increase Decrease In Income Taxes Payable Net Of Income Taxes Receivable IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable	-2430000	USD
	us-gaap	Increase Decrease In Income Taxes Payable Net Of Income Taxes Receivable IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable	-1942000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	13102000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	34918000	USD
	us-gaap	Increase Decrease In Other Accounts Payable And Accrued Liabilities IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities	5103000	USD
	us-gaap	Increase Decrease In Other Accounts Payable And Accrued Liabilities IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities	-24762000	USD
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-20612000	USD
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	8334000	USD
	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	24110000	USD
	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	5983000	USD
CY2017Q3	us-gaap	Interest Expense InterestExpense	5972000	USD
	us-gaap	Interest Expense InterestExpense	21400000	USD
CY2018Q3	us-gaap	Interest Expense InterestExpense	5179000	USD
	us-gaap	Interest Expense InterestExpense	15624000	USD
CY2017Q3	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-5252000	USD
	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-19311000	USD
CY2018Q3	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-3378000	USD
	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-10998000	USD
CY2017Q4	us-gaap	Interest Payable Current InterestPayableCurrent	246000	USD
CY2018Q3	us-gaap	Interest Payable Current InterestPayableCurrent	237000	USD
CY2018Q3	us-gaap	Interest Rate Cash Flow Hedge Gain Loss To Be Reclassified During Next12 Months Net InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet	-5500000	USD
CY2017Q4	us-gaap	Inventory Net InventoryNet	128960000	USD
CY2018Q3	us-gaap	Inventory Net InventoryNet	163878000	USD
CY2017Q4	us-gaap	Inventory Parts And Components Net Of Reserves InventoryPartsAndComponentsNetOfReserves	74268000	USD
CY2018Q3	us-gaap	Inventory Parts And Components Net Of Reserves InventoryPartsAndComponentsNetOfReserves	86381000	USD
CY2017Q4	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	300000	USD
CY2018Q3	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	1000000	USD
CY2017Q4	us-gaap	Liabilities Liabilities	1313767000	USD
CY2018Q3	us-gaap	Liabilities Liabilities	1310482000	USD
CY2017Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1979632000	USD
CY2018Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1997622000	USD
CY2017Q4	us-gaap	Liabilities Current LiabilitiesCurrent	334081000	USD
CY2018Q3	us-gaap	Liabilities Current LiabilitiesCurrent	334774000	USD
CY2017Q4	us-gaap	Litigation Reserve LitigationReserve	200000	USD
CY2018Q3	us-gaap	Litigation Reserve LitigationReserve	400000	USD
CY2017Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	310134000	USD
CY2018Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	302830000	USD
CY2017Q4	us-gaap	Mine Reclamation And Closing Liability Noncurrent MineReclamationAndClosingLiabilityNoncurrent	308855000	USD
CY2018Q3	us-gaap	Mine Reclamation And Closing Liability Noncurrent MineReclamationAndClosingLiabilityNoncurrent	319601000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-279577000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-229772000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-100651000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-64266000	USD
CY2017Q3	us-gaap	Net Income Loss NetIncomeLoss	68351000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	302145000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	266115000	USD
	us-gaap	Net Income Loss NetIncomeLoss	157179000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	123192000	USD
	us-gaap	Net Income Loss NetIncomeLoss	226483000	USD
CY2017Q3	us-gaap	Nondebtor Reorganization Items Net Gain Loss On Settlement Of Other Claims1 NondebtorReorganizationItemsNetGainLossOnSettlementOfOtherClaims1	-43000	USD
	us-gaap	Nondebtor Reorganization Items Net Gain Loss On Settlement Of Other Claims1 NondebtorReorganizationItemsNetGainLossOnSettlementOfOtherClaims1	-2892000	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	-1601000	USD
CY2017Q3	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-1350000	USD
	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-7213000	USD
CY2018Q3	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-1531000	USD
	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-4292000	USD
	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	Segment
CY2017Q3	us-gaap	Operating Expenses OperatingExpenses	540228000	USD
	us-gaap	Operating Expenses OperatingExpenses	1581160000	USD
CY2018Q3	us-gaap	Operating Expenses OperatingExpenses	550294000	USD
	us-gaap	Operating Expenses OperatingExpenses	1608176000	USD
CY2017Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	68058000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	163908000	USD
CY2018Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	79508000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	181650000	USD
CY2017Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	6976000	USD
CY2018Q3	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	5630000	USD
CY2017Q4	us-gaap	Other Assets Current OtherAssetsCurrent	70426000	USD
CY2018Q3	us-gaap	Other Assets Current OtherAssetsCurrent	95040000	USD
CY2017Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	86583000	USD
CY2018Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	95267000	USD
CY2017Q3	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent	0	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent	-387000	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	-379000	USD
CY2017Q3	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	0	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-387000	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	-379000	USD
CY2017Q3	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
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
CY2017Q3	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent	8521000	USD
	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent	5367000	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	-6389000	USD
CY2017Q3	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	8521000	USD
	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	5367000	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	-6389000	USD
CY2017Q3	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
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
CY2017Q3	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesBeforeTaxPortionAttributableToParent	-19000	USD
	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesBeforeTaxPortionAttributableToParent	257000	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	-5672000	USD
CY2017Q3	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent	-19000	USD
	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent	257000	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	-5672000	USD
CY2017Q3	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
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 Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-1725000	USD
CY2017Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-8540000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-5497000	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	338000	USD
CY2017Q3	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	13861000	USD
	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	42903000	USD
CY2018Q3	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	3241000	USD
	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	9540000	USD
CY2017Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	59457000	USD
CY2018Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	61896000	USD
CY2017Q4	us-gaap	Other Long Term Debt OtherLongTermDebt	36514000	USD
CY2018Q3	us-gaap	Other Long Term Debt OtherLongTermDebt	26338000	USD
CY2017Q3	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	720000	USD
	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	2089000	USD
CY2018Q3	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	1801000	USD
	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	4626000	USD
CY2017Q3	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	8250000	USD
	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	14078000	USD
CY2018Q3	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	7070000	USD
	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	21320000	USD
CY2017Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent	102369000	USD
CY2018Q3	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent	105400000	USD
CY2017Q4	us-gaap	Other Receivables OtherReceivables	29771000	USD
CY2018Q3	us-gaap	Other Receivables OtherReceivables	26972000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	215735000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	192221000	USD
	us-gaap	Payments Of Debt Restructuring Costs PaymentsOfDebtRestructuringCosts	2400000	USD
	us-gaap	Payments Of Debt Restructuring Costs PaymentsOfDebtRestructuringCosts	2360000	USD
	us-gaap	Payments Of Debt Restructuring Costs PaymentsOfDebtRestructuringCosts	50000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	665865000	USD
CY2018Q3	us-gaap	Stockholders Equity StockholdersEquity	687140000	USD
CY2018Q3	us-gaap	Tax Adjustments Settlements And Unusual Provisions TaxAdjustmentsSettlementsAndUnusualProvisions	24900000	USD
CY2017Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	3977000	shares
	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	10043000	USD
	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	10000000	USD
	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	1009000	USD
	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	1000000	USD
	us-gaap	Payments Of Ordinary Dividends PaymentsOfOrdinaryDividends	16763000	USD
	us-gaap	Payments Of Ordinary Dividends PaymentsOfOrdinaryDividends	23966000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	191327000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	140097000	USD
CY2017Q3	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	13581000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	30503000	USD
CY2018Q3	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	25693000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	55742000	USD
	us-gaap	Payments To Acquire Royalty Interests In Mining Properties PaymentsToAcquireRoyaltyInterestsInMiningProperties	5033000	USD
	us-gaap	Payments To Acquire Royalty Interests In Mining Properties PaymentsToAcquireRoyaltyInterestsInMiningProperties	522000	USD
CY2017Q3	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	821000	USD
	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	1774000	USD
CY2018Q3	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	971000	USD
	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	2206000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	298500000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	10000	USD
	us-gaap	Proceeds From Repayments Of Other Debt ProceedsFromRepaymentsOfOtherDebt	-5992000	USD
	us-gaap	Proceeds From Repayments Of Other Debt ProceedsFromRepaymentsOfOtherDebt	-10286000	USD
	us-gaap	Proceeds From Repayments Of Other Long Term Debt ProceedsFromRepaymentsOfOtherLongTermDebt	-1500000	USD
	us-gaap	Proceeds From Repayments Of Other Long Term Debt ProceedsFromRepaymentsOfOtherLongTermDebt	-2250000	USD
	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	123996000	USD
	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	133400000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	955948000	USD
CY2018Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	919613000	USD
	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-2063000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	325684000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	0	USD
CY2017Q3	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	2000	USD
CY2018Q3	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	0	USD
CY2017Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	247232000	USD
CY2018Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	449122000	USD
CY2017Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	613538000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1764379000	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	1800824000	USD
CY2017Q3	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	21290000	USD
	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	64508000	USD
CY2018Q3	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	22909000	USD
	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	73613000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	7485000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	12161000	USD
CY2018Q3	us-gaap	Treasury Stock Shares TreasuryStockShares	6215000	shares
CY2017Q4	us-gaap	Treasury Stock Value TreasuryStockValue	302109000	USD
CY2018Q3	us-gaap	Treasury Stock Value TreasuryStockValue	495232000	USD
CY2017Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	555000	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	459000	shares
CY2018Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	958000	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	938000	shares
CY2017Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	24135000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	24875000	shares
CY2018Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	20208000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	21040000	shares
CY2017Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	23580000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	24416000	shares
CY2018Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	19250000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	20102000	shares
CY2018Q3	us-gaap	Workers Compensation Discount Amount WorkersCompensationDiscountAmount	4000000	USD
CY2018Q3	us-gaap	Workers Compensation Discount Percent WorkersCompensationDiscountPercent	0.0308
CY2017Q4	us-gaap	Workers Compensation Liability Current WorkersCompensationLiabilityCurrent	18782000	USD
CY2018Q3	us-gaap	Workers Compensation Liability Current WorkersCompensationLiabilityCurrent	19787000	USD
CY2017Q4	us-gaap	Workers Compensation Liability Noncurrent WorkersCompensationLiabilityNoncurrent	184835000	USD
CY2018Q3	us-gaap	Workers Compensation Liability Noncurrent WorkersCompensationLiabilityNoncurrent	180880000	USD

Files In Submission

Name	View Source	Status
0001628280-18-012798-index-headers.html	Edgar Link	pending
0001628280-18-012798-index.html	Edgar Link	pending
0001628280-18-012798.txt	Edgar Link	pending
0001628280-18-012798-xbrl.zip	Edgar Link	pending
aci-20180930.xml	Edgar Link	completed
aci-20180930.xsd	Edgar Link	pending
aci-20180930x10q.htm	Edgar Link	pending
aci-20180930xex107.htm	Edgar Link	pending
aci-20180930xex311.htm	Edgar Link	pending
aci-20180930xex312.htm	Edgar Link	pending
aci-20180930xex321.htm	Edgar Link	pending
aci-20180930xex322.htm	Edgar Link	pending
aci-20180930xex95.htm	Edgar Link	pending
aci-20180930_cal.xml	Edgar Link	unprocessable
aci-20180930_def.xml	Edgar Link	unprocessable
aci-20180930_lab.xml	Edgar Link	unprocessable
aci-20180930_pre.xml	Edgar Link	unprocessable
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
logoa02a01a01a01a01a14.jpg	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
R12.htm	Edgar Link	pending
R13.htm	Edgar Link	pending
R14.htm	Edgar Link	pending
R15.htm	Edgar Link	pending
R16.htm	Edgar Link	pending
R17.htm	Edgar Link	pending
R18.htm	Edgar Link	pending
R19.htm	Edgar Link	pending
R2.htm	Edgar Link	pending
R20.htm	Edgar Link	pending
R21.htm	Edgar Link	pending
R22.htm	Edgar Link	pending
R23.htm	Edgar Link	pending
R24.htm	Edgar Link	pending
R25.htm	Edgar Link	pending
R26.htm	Edgar Link	pending
R27.htm	Edgar Link	pending
R28.htm	Edgar Link	pending
R29.htm	Edgar Link	pending
R3.htm	Edgar Link	pending
R30.htm	Edgar Link	pending
R31.htm	Edgar Link	pending
R32.htm	Edgar Link	pending
R33.htm	Edgar Link	pending
R34.htm	Edgar Link	pending
R35.htm	Edgar Link	pending
R36.htm	Edgar Link	pending
R37.htm	Edgar Link	pending
R38.htm	Edgar Link	pending
R39.htm	Edgar Link	pending
R4.htm	Edgar Link	pending
R40.htm	Edgar Link	pending
R41.htm	Edgar Link	pending
R42.htm	Edgar Link	pending
R43.htm	Edgar Link	pending
R44.htm	Edgar Link	pending
R45.htm	Edgar Link	pending
R46.htm	Edgar Link	pending
R47.htm	Edgar Link	pending
R48.htm	Edgar Link	pending
R49.htm	Edgar Link	pending
R5.htm	Edgar Link	pending
R50.htm	Edgar Link	pending
R51.htm	Edgar Link	pending
R52.htm	Edgar Link	pending
R53.htm	Edgar Link	pending
R54.htm	Edgar Link	pending
R55.htm	Edgar Link	pending
R56.htm	Edgar Link	pending
R57.htm	Edgar Link	pending
R58.htm	Edgar Link	pending
R59.htm	Edgar Link	pending
R6.htm	Edgar Link	pending
R60.htm	Edgar Link	pending
R61.htm	Edgar Link	pending
R62.htm	Edgar Link	pending
R63.htm	Edgar Link	pending
R64.htm	Edgar Link	pending
R65.htm	Edgar Link	pending
R66.htm	Edgar Link	pending
R67.htm	Edgar Link	pending
R68.htm	Edgar Link	pending
R69.htm	Edgar Link	pending
R7.htm	Edgar Link	pending
R70.htm	Edgar Link	pending
R71.htm	Edgar Link	pending
R72.htm	Edgar Link	pending
R73.htm	Edgar Link	pending
R8.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending

Create your account

Find Stocks Worth Researching

Deeply Understand Businesses

Value Businesses Intelligently

$ARCH
ARCH RESOURCES, INC. Stock $arch

2018 Q4 Form 10-Q Financial Statement

#000162828018012798 Filed on October 23, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ARCH ARCH RESOURCES, INC. Stock $arch

2018 Q4 Form 10-Q Financial Statement

#000162828018012798 Filed on October 23, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ARCH
ARCH RESOURCES, INC. Stock $arch