$AMR
Alpha Metallurgical Resources, Inc. Stock $amr

$amr Overview Financials Valuation SEC Filings Company Website

2020 Q4 Form 10-Q Financial Statement

#000170471520000048 Filed on November 09, 2020

Income Statement

Concept	2020 Q4	2020 Q3	2019 Q3
Revenue	$133.2M	$335.6M	$525.9M
YoY Change	-73.31%	-36.18%	17.41%
Cost Of Revenue	$132.6M	$367.3M	$467.7M
YoY Change	-29.36%	-21.47%	17.31%
Gross Profit	$600.0K	$33.40M	$58.20M
YoY Change	-97.32%	-42.61%	18.53%
Gross Profit Margin	0.45%	9.95%	11.07%
Selling, General & Admin	$15.30M	$14.50M	$17.39M
YoY Change	-40.7%	-16.6%	40.42%
% of Gross Profit	2550.0%	43.42%	29.87%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$1.900M	$53.00M	$60.80M
YoY Change	-112.18%	-12.83%	390.32%
% of Gross Profit	316.67%	158.68%	104.47%
Operating Expenses	$7.300M	$14.50M	$17.39M
YoY Change	-89.33%	-16.6%	40.42%
Operating Profit	-$6.700M	-$48.74M	-$26.21M
YoY Change	-85.43%	85.94%	-209.91%
Interest Expense	-$20.00M	$18.75M	$18.85M
YoY Change	12.36%	-0.54%	120.33%
% of Operating Profit
Other Income/Expense, Net	-$900.0K	-$19.80M	-$20.45M
YoY Change	-87.67%	-3.21%	108.16%
Pretax Income	$105.3M	-$68.53M	-$46.66M
YoY Change	-141.65%	46.87%	-432.76%
Income Tax	$0.00	-$45.00K	-$3.102M
% Of Pretax Income	0.0%
Net Earnings	-$100.2M	-$68.64M	-$68.53M
YoY Change	-28.91%	0.15%	-676.19%
Net Earnings / Revenue	-75.23%	-20.45%	-13.03%
Basic Earnings Per Share		-$3.75	-$3.60
Diluted Earnings Per Share	-$5.475M	-$3.75	-$3.60
COMMON SHARES
Basic Shares Outstanding	18.31M shares	18.32M shares	19.03M shares
Diluted Shares Outstanding		18.32M shares	19.03M shares

Balance Sheet

Concept	2020 Q4	2020 Q3	2019 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$139.2M	$161.4M	$152.6M
YoY Change	-34.59%	5.77%	-35.91%
Cash & Equivalents	$139.2M	$161.4M	$152.6M
Short-Term Investments
Other Short-Term Assets	$117.2M	$120.9M	$185.3M
YoY Change	28.23%	-34.75%	121.92%
Inventory	$108.1M	$124.2M	$172.6M
Prepaid Expenses
Receivables	$145.7M	$179.7M	$259.9M
Other Receivables	$13.25M	$0.00	$0.00
Total Short-Term Assets	$510.1M	$586.3M	$770.5M
YoY Change	-28.3%	-23.9%	48.5%
LONG-TERM ASSETS
Property, Plant & Equipment	$832.5M	$897.3M	$614.6M
YoY Change	42.73%	45.99%	181.49%
Goodwill			$124.4M
YoY Change
Intangibles	$88.20M	$100.4M	$138.7M
YoY Change	-29.02%	-27.66%	2215.94%
Long-Term Investments	$18.38M
YoY Change	-0.16%
Other Assets	$149.4M	$221.6M	$189.5M
YoY Change	-21.16%	16.91%	390.99%
Total Long-Term Assets	$1.170B	$1.337B	$1.899B
YoY Change	-26.48%	-29.62%	389.79%
TOTAL ASSETS
Total Short-Term Assets	$510.1M	$586.3M	$770.5M
Total Long-Term Assets	$1.170B	$1.337B	$1.899B
Total Assets	$1.680B	$1.923B	$2.670B
YoY Change	-27.04%	-27.97%	194.49%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$58.41M	$75.84M	$98.61M
YoY Change	-29.39%	-23.09%	24.25%
Accrued Expenses	$140.4M	$153.4M	$149.0M
YoY Change	0.66%	2.95%	165.95%
Deferred Revenue	$13.20M
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$28.80M	$44.90M	$29.00M
YoY Change	1.05%	54.83%	504.17%
Total Short-Term Liabilities	$259.1M	$292.3M	$330.2M
YoY Change	-17.8%	-11.48%	87.56%
LONG-TERM LIABILITIES
Long-Term Debt	$553.7M	$552.7M	$563.8M
YoY Change	-1.91%	-1.97%	55.83%
Other Long-Term Liabilities	$28.07M	$54.94M	$35.16M
YoY Change	4.66%	56.26%	-43.0%
Total Long-Term Liabilities	$28.07M	$54.94M	$35.16M
YoY Change	4.66%	56.26%	-43.0%
TOTAL LIABILITIES
Total Short-Term Liabilities	$259.1M	$292.3M	$330.2M
Total Long-Term Liabilities	$28.07M	$54.94M	$35.16M
Total Liabilities	$1.480B	$1.580B	$1.801B
YoY Change	-7.89%	-12.26%	169.84%
SHAREHOLDERS EQUITY
Retained Earnings	-$360.5M	-$260.4M	$227.8M
YoY Change	-515.31%	-214.32%	-7.64%
Common Stock	$206.0K	$206.0K	$205.0K
YoY Change	0.49%	0.49%	89.81%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$107.0M	$107.0M	$107.7M
YoY Change	-0.9%	-0.67%	96.06%
Treasury Stock Shares
Shareholders Equity	$200.1M	$343.0M	$868.9M
YoY Change
Total Liabilities & Shareholders Equity	$1.680B	$1.923B	$2.670B
YoY Change	-27.04%	-27.97%	194.49%

Cashflow Statement

Concept	2020 Q4	2020 Q3	2019 Q3
OPERATING ACTIVITIES
Net Income	-$100.2M	-$68.64M	-$68.53M
YoY Change	-28.91%	0.15%	-676.19%
Depreciation, Depletion And Amortization	$1.900M	$53.00M	$60.80M
YoY Change	-112.18%	-12.83%	390.32%
Cash From Operating Activities	$56.20M	-$5.900M	$20.50M
YoY Change	-1085.96%	-128.78%	-66.23%
INVESTING ACTIVITIES
Capital Expenditures	-$35.10M	-$27.80M	-$60.30M
YoY Change	-27.18%	-53.9%	227.72%
Acquisitions
YoY Change
Other Investing Activities	-$50.10M	$3.100M	-$31.20M
YoY Change	-307.88%	-109.94%	940.0%
Cash From Investing Activities	-$85.20M	-$24.70M	-$91.50M
YoY Change	252.07%	-73.01%	327.57%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-19.10M	-28.90M	-46.30M
YoY Change	241.07%	-37.58%	2793.75%
NET CHANGE
Cash From Operating Activities	56.20M	-5.900M	20.50M
Cash From Investing Activities	-85.20M	-24.70M	-91.50M
Cash From Financing Activities	-19.10M	-28.90M	-46.30M
Net Change In Cash	-48.10M	-59.50M	-117.3M
YoY Change	35.49%	-49.28%	-411.14%
FREE CASH FLOW
Cash From Operating Activities	$56.20M	-$5.900M	$20.50M
Capital Expenditures	-$35.10M	-$27.80M	-$60.30M
Free Cash Flow	$91.30M	$21.90M	$80.80M
YoY Change	114.82%	-72.9%	2.15%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Entity Central Index Key EntityCentralIndexKey	0001704715
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Document Period End Date DocumentPeriodEndDate	2020-09-30
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	dei	Amendment Flag AmendmentFlag	false
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	dei	Document Type DocumentType	10-Q
	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2020-09-30
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity File Number EntityFileNumber	001-38735
	dei	Entity File Number EntityFileNumber	001-38735
	dei	Entity Registrant Name EntityRegistrantName	CONTURA ENERGY, INC.
	dei	Entity Registrant Name EntityRegistrantName	CONTURA ENERGY, INC.
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	81-3015061
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	81-3015061
	dei	Entity Address Address Line1 EntityAddressAddressLine1	340 Martin Luther King Jr. Blvd.
	dei	Entity Address Address Line1 EntityAddressAddressLine1	340 Martin Luther King Jr. Blvd.
	dei	Entity Address City Or Town EntityAddressCityOrTown	Bristol
	dei	Entity Address City Or Town EntityAddressCityOrTown	Bristol
	dei	Entity Address State Or Province EntityAddressStateOrProvince	TN
	dei	Entity Address State Or Province EntityAddressStateOrProvince	TN
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	37620
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	37620
	dei	City Area Code CityAreaCode	423
	dei	City Area Code CityAreaCode	423
	dei	Local Phone Number LocalPhoneNumber	573-0300
	dei	Local Phone Number LocalPhoneNumber	573-0300
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Filer Category EntityFilerCategory	Accelerated Filer
	dei	Entity Filer Category EntityFilerCategory	Accelerated Filer
	dei	Entity Small Business EntitySmallBusiness	false
	dei	Entity Small Business EntitySmallBusiness	false
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Entity Shell Company EntityShellCompany	false
	dei	Security12b Title Security12bTitle	Common Stock
	dei	Trading Symbol TradingSymbol	CTRA
	dei	Security Exchange Name SecurityExchangeName	NYSE
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	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-2200000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-8880000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-68637000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-43561000	USD
	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-346746000	USD
	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-11271000	USD
CY2020Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	0	USD
CY2019Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	-11516000	USD
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	0	USD
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	-176973000	USD
CY2020Q3	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	0	USD
CY2019Q3	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	13455000	USD
	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	0	USD
	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	-12866000	USD
CY2020Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	0	USD
CY2019Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-24971000	USD
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	0	USD
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-164107000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	-68637000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	-68532000	USD
	us-gaap	Net Income Loss NetIncomeLoss	-346746000	USD
	us-gaap	Net Income Loss NetIncomeLoss	-175378000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-3.75
CY2019Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-2.29
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-18.96
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-0.59
CY2020Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	0
CY2019Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	-1.31
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	0
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare	-8.63
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-3.75
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-3.60
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-18.96
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-9.22
CY2020Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-3.75
CY2019Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-2.29
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-18.96
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-0.59
CY2020Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare	0
CY2019Q3	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare	-1.31
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare	0
	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Diluted Share DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare	-8.63
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-3.75
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-3.60
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-18.96
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-9.22
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	18319947	shares
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	19025462	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	18290346	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	19014974	shares
CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	18319947	shares
CY2019Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	19025462	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	18290346	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	19014974	shares
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	-68637000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	-68532000	USD
	us-gaap	Net Income Loss NetIncomeLoss	-346746000	USD
	us-gaap	Net Income Loss NetIncomeLoss	-175378000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent	-1133000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent	86000	USD
	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent	9998000	USD
	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent	-1340000	USD
CY2020Q3	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 Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent	22000	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	-350000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1133000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-64000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-9998000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	990000	USD
CY2020Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-67504000	USD
CY2019Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-68596000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-356744000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-174388000	USD
CY2020Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	161434000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	212793000	USD
CY2020Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	432000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	0	USD
CY2020Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	179671000	USD
CY2019Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	244666000	USD
CY2020Q3	us-gaap	Inventory Net InventoryNet	124245000	USD
CY2019Q4	us-gaap	Inventory Net InventoryNet	162659000	USD
CY2020Q3	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	120939000	USD
CY2019Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	91361000	USD
CY2020Q3	us-gaap	Assets Current AssetsCurrent	586289000	USD
CY2019Q4	us-gaap	Assets Current AssetsCurrent	711479000	USD
CY2020Q3	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization	395397000	USD
CY2019Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization	314276000	USD
CY2020Q3	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	401197000	USD
CY2019Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	583262000	USD
CY2020Q3	us-gaap	Mineral Properties Accumulated Depletion MineralPropertiesAccumulatedDepletion	40623000	USD
CY2019Q4	us-gaap	Mineral Properties Accumulated Depletion MineralPropertiesAccumulatedDepletion	27877000	USD
CY2020Q3	us-gaap	Mineral Rights MineralRights	489631000	USD
CY2019Q4	us-gaap	Mineral Rights MineralRights	523141000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	38806000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	32686000	USD
CY2020Q3	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	100350000	USD
CY2019Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	125145000	USD
CY2020Q3	us-gaap	Restricted Cash Noncurrent RestrictedCashNoncurrent	124065000	USD
CY2019Q4	us-gaap	Restricted Cash Noncurrent RestrictedCashNoncurrent	122524000	USD
CY2020Q3	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	0	USD
CY2019Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	33065000	USD
CY2020Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	221591000	USD
CY2019Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	204207000	USD
CY2020Q3	us-gaap	Assets Assets	1923123000	USD
CY2019Q4	us-gaap	Assets Assets	2302823000	USD
CY2020Q3	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	44864000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	28485000	USD
CY2020Q3	us-gaap	Accounts Payable Current AccountsPayableCurrent	75836000	USD
CY2019Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	98746000	USD
CY2020Q3	ctra	Acquisition Related Obligations Carrying Amount Current AcquisitionRelatedObligationsCarryingAmountCurrent	18206000	USD
CY2019Q4	ctra	Acquisition Related Obligations Carrying Amount Current AcquisitionRelatedObligationsCarryingAmountCurrent	33639000	USD
CY2020Q3	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	153372000	USD
CY2019Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	154282000	USD
CY2020Q3	us-gaap	Liabilities Current LiabilitiesCurrent	292278000	USD
CY2019Q4	us-gaap	Liabilities Current LiabilitiesCurrent	315152000	USD
CY2020Q3	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	552676000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	564481000	USD
CY2020Q3	ctra	Acquisition Related Obligations Carrying Amount Noncurrent AcquisitionRelatedObligationsCarryingAmountNoncurrent	19286000	USD
CY2019Q4	ctra	Acquisition Related Obligations Carrying Amount Noncurrent AcquisitionRelatedObligationsCarryingAmountNoncurrent	46259000	USD
CY2020Q3	ctra	Liability Defined Benefit Plan Postretirement Black Lung Health Coverageand Workers Compensation Noncurrent LiabilityDefinedBenefitPlanPostretirementBlackLungHealthCoverageandWorkersCompensationNoncurrent	263517000	USD
CY2019Q4	ctra	Liability Defined Benefit Plan Postretirement Black Lung Health Coverageand Workers Compensation Noncurrent LiabilityDefinedBenefitPlanPostretirementBlackLungHealthCoverageandWorkersCompensationNoncurrent	260778000	USD
CY2020Q3	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	186089000	USD
CY2019Q4	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	204086000	USD
CY2020Q3	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	210998000	USD
CY2019Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	184130000	USD
CY2020Q3	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	368000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	422000	USD
CY2020Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	54943000	USD
CY2019Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	31393000	USD
CY2020Q3	us-gaap	Liabilities Liabilities	1580155000	USD
CY2019Q4	us-gaap	Liabilities Liabilities	1606701000	USD
CY2020Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2019Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2020Q3	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2019Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2020Q3	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000.0	shares
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CY2019Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
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CY2020Q3	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
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CY2019Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2020Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2019Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	50000000.0	shares
CY2020Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	50000000.0	shares
CY2020Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	20600000	shares
CY2020Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	18300000	shares
CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	20500000	shares
CY2019Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	18200000	shares
CY2020Q3	us-gaap	Common Stock Value CommonStockValue	206000	USD
CY2019Q4	us-gaap	Common Stock Value CommonStockValue	205000	USD
CY2020Q3	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	778728000	USD
CY2019Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	775707000	USD
CY2020Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-68614000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-58616000	USD
CY2020Q3	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	2300000	shares
CY2019Q4	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	2300000	shares
CY2020Q3	us-gaap	Treasury Stock Value TreasuryStockValue	106976000	USD
CY2019Q4	us-gaap	Treasury Stock Value TreasuryStockValue	107984000	USD
CY2020Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-260376000	USD
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	86810000	USD
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	342968000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	696122000	USD
CY2020Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1923123000	USD
CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2302823000	USD
	us-gaap	Net Income Loss NetIncomeLoss	-346746000	USD
	us-gaap	Net Income Loss NetIncomeLoss	-175378000	USD
	ctra	Depreciation Depletion And Amortization Excluding Acquired Intangibles Including Discontinued Operations DepreciationDepletionAndAmortizationExcludingAcquiredIntangiblesIncludingDiscontinuedOperations	154466000	USD
	ctra	Depreciation Depletion And Amortization Excluding Acquired Intangibles Including Discontinued Operations DepreciationDepletionAndAmortizationExcludingAcquiredIntangiblesIncludingDiscontinuedOperations	330840000	USD
	ctra	Amortizationof Intangibles AmortizationofIntangibles	5180000	USD
	ctra	Amortizationof Intangibles AmortizationofIntangibles	-4712000	USD
	ctra	Acquisition Related Obligations Discount Accretion Expense AcquisitionRelatedObligationsDiscountAccretionExpense	-2882000	USD
	ctra	Acquisition Related Obligations Discount Accretion Expense AcquisitionRelatedObligationsDiscountAccretionExpense	-4367000	USD
	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	11087000	USD
	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	10446000	USD
	ctra	Acquisition Related Obligations Changesin Fair Value Gain Loss AcquisitionRelatedObligationsChangesinFairValueGainLoss	13425000	USD
	ctra	Acquisition Related Obligations Changesin Fair Value Gain Loss AcquisitionRelatedObligationsChangesinFairValueGainLoss	288000	USD
	ctra	Gain Losson Dispositionof Assets Including Costof Sales GainLossonDispositionofAssetsIncludingCostofSales	2179000	USD
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	us-gaap	Nonmonetary Transaction Gain Loss Recognized On Transfer NonmonetaryTransactionGainLossRecognizedOnTransfer	0	USD
	us-gaap	Nonmonetary Transaction Gain Loss Recognized On Transfer NonmonetaryTransactionGainLossRecognizedOnTransfer	9083000	USD
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	us-gaap	Restructuring Costs And Asset Impairment Charges RestructuringCostsAndAssetImpairmentCharges	221453000	USD
	us-gaap	Restructuring Costs And Asset Impairment Charges RestructuringCostsAndAssetImpairmentCharges	23020000	USD
	ctra	Asset Retirement Obligation Accretion Expense Including Adjustmentfor Liabilities Heldfor Saleand Discontinued Operations AssetRetirementObligationAccretionExpenseIncludingAdjustmentforLiabilitiesHeldforSaleandDiscontinuedOperations	23806000	USD
	ctra	Asset Retirement Obligation Accretion Expense Including Adjustmentfor Liabilities Heldfor Saleand Discontinued Operations AssetRetirementObligationAccretionExpenseIncludingAdjustmentforLiabilitiesHeldforSaleandDiscontinuedOperations	24906000	USD
	us-gaap	Pension And Other Postretirement Benefits Expense Reversal Of Expense Noncash PensionAndOtherPostretirementBenefitsExpenseReversalOfExpenseNoncash	15135000	USD
	us-gaap	Pension And Other Postretirement Benefits Expense Reversal Of Expense Noncash PensionAndOtherPostretirementBenefitsExpenseReversalOfExpenseNoncash	14513000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	33011000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-22021000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	4200000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	7512000	USD
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-3085000	USD
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-4804000	USD
	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-5356000	USD
	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	351000	USD
	us-gaap	Increase Decrease In Operating Capital IncreaseDecreaseInOperatingCapital	33566000	USD
	us-gaap	Increase Decrease In Operating Capital IncreaseDecreaseInOperatingCapital	99620000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	73033000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	137578000	USD
	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	118896000	USD
	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	144183000	USD
	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	3131000	USD
	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	1170000	USD
	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	18618000	USD
	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	65193000	USD
	us-gaap	Proceeds From Sale Maturity And Collections Of Investments ProceedsFromSaleMaturityAndCollectionsOfInvestments	12678000	USD
	us-gaap	Proceeds From Sale Maturity And Collections Of Investments ProceedsFromSaleMaturityAndCollectionsOfInvestments	50775000	USD
	ctra	Payments To Acquire Equity Method Investments Capital Contributions PaymentsToAcquireEquityMethodInvestmentsCapitalContributions	3196000	USD
	ctra	Payments To Acquire Equity Method Investments Capital Contributions PaymentsToAcquireEquityMethodInvestmentsCapitalContributions	7600000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-68000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	2548000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-124833000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-167579000	USD
	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	57500000	USD
	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	544946000	USD
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	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	551405000	USD
	us-gaap	Repayments Of Notes Payable RepaymentsOfNotesPayable	14951000	USD
	us-gaap	Repayments Of Notes Payable RepaymentsOfNotesPayable	14054000	USD
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	2291000	USD
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	2960000	USD
	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	6104000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	171000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	35485000	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	0	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	952000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-3277000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-64110000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-55077000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-94111000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	347680000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	477246000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	292603000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	383135000	USD
CY2020Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	161434000	USD
CY2019Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	152638000	USD
CY2020Q3	us-gaap	Restricted Cash Current RestrictedCashCurrent	7104000	USD
CY2019Q3	us-gaap	Restricted Cash Current RestrictedCashCurrent	21456000	USD
CY2020Q3	us-gaap	Restricted Cash Noncurrent RestrictedCashNoncurrent	124065000	USD
CY2019Q3	us-gaap	Restricted Cash Noncurrent RestrictedCashNoncurrent	209041000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	292603000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	383135000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	1071140000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	6815000	USD
CY2019Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	177000	USD
CY2019Q1	ctra	Stock Issued During Period Value Sharebased Compensation Including Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period StockIssuedDuringPeriodValueSharebasedCompensationIncludingAdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriod	6377000	USD
CY2019Q1	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	306000	USD
CY2019Q1	ctra	Treasury Stock Value Acquired Cost Method And Stock Issued During Period Value Treasury Stock Reissued Net TreasuryStockValueAcquiredCostMethodAndStockIssuedDuringPeriodValueTreasuryStockReissuedNet	4171000	USD
CY2019Q1	us-gaap	Stockholders Equity StockholdersEquity	1080644000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	-113661000	USD
CY2019Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	877000	USD
CY2019Q2	ctra	Stock Issued During Period Value Sharebased Compensation Including Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period StockIssuedDuringPeriodValueSharebasedCompensationIncludingAdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriod	-545000	USD
CY2019Q2	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	590000	USD
CY2019Q2	ctra	Treasury Stock Value Acquired Cost Method And Stock Issued During Period Value Treasury Stock Reissued Net TreasuryStockValueAcquiredCostMethodAndStockIssuedDuringPeriodValueTreasuryStockReissuedNet	703000	USD
CY2019Q2	ctra	Stock Issued During Period Value Warrants Exercised StockIssuedDuringPeriodValueWarrantsExercised	19000	USD
CY2019Q2	us-gaap	Stockholders Equity StockholdersEquity	967221000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	-68532000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-64000	USD
CY2019Q3	ctra	Stock Issued During Period Value Sharebased Compensation Including Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period StockIssuedDuringPeriodValueSharebasedCompensationIncludingAdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriod	2739000	USD
CY2019Q3	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	38000	USD
CY2019Q3	ctra	Treasury Stock Value Acquired Cost Method And Stock Issued During Period Value Treasury Stock Reissued Net TreasuryStockValueAcquiredCostMethodAndStockIssuedDuringPeriodValueTreasuryStockReissuedNet	32464000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	868938000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	696122000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	-39808000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-4010000	USD
CY2020Q1	ctra	Stock Issued During Period Value Sharebased Compensation Including Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period StockIssuedDuringPeriodValueSharebasedCompensationIncludingAdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriod	900000	USD
CY2020Q1	ctra	Treasury Stock Value Acquired Cost Method And Stock Issued During Period Value Treasury Stock Reissued Net TreasuryStockValueAcquiredCostMethodAndStockIssuedDuringPeriodValueTreasuryStockReissuedNet	-1071000	USD
CY2020Q1	us-gaap	Stockholders Equity StockholdersEquity	653835000	USD
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	-238301000	USD
CY2020Q3	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	0	USD
CY2020Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-7121000	USD
CY2020Q2	ctra	Stock Issued During Period Value Sharebased Compensation Including Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period StockIssuedDuringPeriodValueSharebasedCompensationIncludingAdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriod	1044000	USD
CY2020Q2	ctra	Treasury Stock Value Acquired Cost Method And Stock Issued During Period Value Treasury Stock Reissued Net TreasuryStockValueAcquiredCostMethodAndStockIssuedDuringPeriodValueTreasuryStockReissuedNet	42000	USD
CY2020Q2	us-gaap	Stockholders Equity StockholdersEquity	409415000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	-68637000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1133000	USD
CY2020Q3	ctra	Stock Issued During Period Value Sharebased Compensation Including Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period StockIssuedDuringPeriodValueSharebasedCompensationIncludingAdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriod	1078000	USD
CY2020Q3	ctra	Treasury Stock Value Acquired Cost Method And Stock Issued During Period Value Treasury Stock Reissued Net TreasuryStockValueAcquiredCostMethodAndStockIssuedDuringPeriodValueTreasuryStockReissuedNet	21000	USD
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	342968000	USD
CY2020Q2	ctra	Unusualor Infrequent Itemor Both Idled Operation Term UnusualorInfrequentItemorBothIdledOperationTerm	P30D
CY2020Q3	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	138188000	USD
CY2020Q3	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	268185000	USD
CY2020Q3	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	200877000	USD
CY2020Q3	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	0	USD
CY2020Q3	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	0	USD
CY2020Q3	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	607250000	USD
CY2020Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1243866	shares
CY2019Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1136318	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1380076	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	556282	shares
CY2020Q3	ctra	Weighted Average Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount WeightedAverageAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	31665	shares
CY2019Q3	ctra	Weighted Average Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount WeightedAverageAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	57301	shares
	ctra	Weighted Average Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount WeightedAverageAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	38648	shares
	ctra	Weighted Average Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount WeightedAverageAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	332794	shares
CY2020Q3	us-gaap	Inventory Net InventoryNet	124245000	USD
CY2019Q4	us-gaap	Inventory Net InventoryNet	162659000	USD
CY2020Q2	us-gaap	Inventory Write Down InventoryWriteDown	807000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	100350000	USD
CY2020Q3	ctra	Finite Lived Intangible Liabilities Gross FiniteLivedIntangibleLiabilitiesGross	875000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	99475000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	125145000	USD
CY2019Q4	ctra	Finite Lived Intangible Liabilities Gross FiniteLivedIntangibleLiabilitiesGross	6018000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	119127000	USD
CY2020Q1	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	33709000	USD
CY2019Q3	ctra	Impairment Of Prepaid Expenses And Other Assets ImpairmentOfPrepaidExpensesAndOtherAssets	32000	USD
	ctra	Impairment Of Prepaid Expenses And Other Assets ImpairmentOfPrepaidExpensesAndOtherAssets	5858000	USD
CY2019Q3	us-gaap	Restructuring Charges RestructuringCharges	0	USD
	us-gaap	Restructuring Charges RestructuringCharges	0	USD
CY2020Q3	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	5921000	USD
CY2019Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	9718000	USD
CY2020Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	6481000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	8678000	USD
CY2020Q3	ctra	Lease Rightof Use Asset LeaseRightofUseAsset	12402000	USD
CY2019Q4	ctra	Lease Rightof Use Asset LeaseRightofUseAsset	18396000	USD
CY2020Q3	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	3222000	USD
CY2019Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	3275000	USD
CY2020Q3	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	949000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	1813000	USD
CY2020Q3	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	2552000	USD
CY2019Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	4674000	USD
CY2020Q3	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	5532000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	6866000	USD
CY2020Q3	ctra	Lease Liability LeaseLiability	12255000	USD
CY2019Q4	ctra	Lease Liability LeaseLiability	16628000	USD
CY2020Q3	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	805000	USD
CY2019Q3	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	1143000	USD
	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	2546000	USD
	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	2796000	USD
CY2020Q3	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	81000	USD
CY2019Q3	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	108000	USD
	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	277000	USD
	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	366000	USD
CY2020Q3	us-gaap	Operating Lease Cost OperatingLeaseCost	509000	USD
CY2019Q3	us-gaap	Operating Lease Cost OperatingLeaseCost	732000	USD
	us-gaap	Operating Lease Cost OperatingLeaseCost	1603000	USD
	us-gaap	Operating Lease Cost OperatingLeaseCost	2062000	USD
CY2020Q3	us-gaap	Short Term Lease Cost ShortTermLeaseCost	380000	USD
CY2019Q3	us-gaap	Short Term Lease Cost ShortTermLeaseCost	494000	USD
	us-gaap	Short Term Lease Cost ShortTermLeaseCost	1255000	USD
	us-gaap	Short Term Lease Cost ShortTermLeaseCost	1474000	USD
CY2020Q3	us-gaap	Lease Cost LeaseCost	1775000	USD
CY2019Q3	us-gaap	Lease Cost LeaseCost	2477000	USD
	us-gaap	Lease Cost LeaseCost	5681000	USD
	us-gaap	Lease Cost LeaseCost	6698000	USD
	us-gaap	Sublease Income SubleaseIncome	0	USD
	us-gaap	Sublease Income SubleaseIncome	0	USD
	us-gaap	Variable Lease Cost VariableLeaseCost	0	USD
	us-gaap	Variable Lease Cost VariableLeaseCost	0	USD
	ctra	Lease Payments LeasePayments	5426000	USD
	ctra	Lease Payments LeasePayments	6862000	USD
	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	276000	USD
	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	366000	USD
	us-gaap	Operating Lease Payments OperatingLeasePayments	2859000	USD
	us-gaap	Operating Lease Payments OperatingLeasePayments	3536000	USD
	ctra	Finance Lease Payments FinanceLeasePayments	2291000	USD
	ctra	Finance Lease Payments FinanceLeasePayments	2960000	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	243000	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	1142000	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	-12000	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	140000	USD
CY2020Q3	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.063
CY2019Q3	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.052
CY2020Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.114
CY2019Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.109
CY2020Q3	us-gaap	Finance Lease Liability Payments Remainder Of Fiscal Year FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear	945000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	489000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	3110000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	1489000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	1854000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	1354000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	272000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	1101000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	6000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	982000	USD
CY2020Q3	ctra	Finance Lease Liability To Be Paid After Year Four FinanceLeaseLiabilityToBePaidAfterYearFour	0	USD
CY2020Q3	ctra	Lessee Operating Lease Liability To Be Paid After Year Four LesseeOperatingLeaseLiabilityToBePaidAfterYearFour	4915000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	6187000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations Including Current Maturities LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities	592966000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	28485000	USD
CY2020Q3	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	44864000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	10330000	USD
CY2020Q3	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	413000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	3849000	USD
CY2020Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	5774000	USD
CY2020Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	6481000	USD
CY2020Q3	us-gaap	Debt Instrument Unamortized Discount Premium And Debt Issuance Costs Net DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet	20358000	USD
CY2019Q4	us-gaap	Debt Instrument Unamortized Discount Premium And Debt Issuance Costs Net DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet	29695000	USD
CY2020Q3	us-gaap	Long Term Debt And Capital Lease Obligations Including Current Maturities LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities	597540000	USD
CY2020Q3	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	552676000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	564481000	USD
CY2020Q3	ctra	Acquisition Related Obligations Discount Premium AcquisitionRelatedObligationsDiscountPremium	1952000	USD
CY2019Q4	ctra	Acquisition Related Obligations Discount Premium AcquisitionRelatedObligationsDiscountPremium	4834000	USD
CY2020Q3	ctra	Acquisition Related Obligations Carrying Amount AcquisitionRelatedObligationsCarryingAmount	37492000	USD
CY2019Q4	ctra	Acquisition Related Obligations Carrying Amount AcquisitionRelatedObligationsCarryingAmount	79898000	USD
CY2020Q3	ctra	Acquisition Related Obligations Carrying Amount Current AcquisitionRelatedObligationsCarryingAmountCurrent	18206000	USD
CY2019Q4	ctra	Acquisition Related Obligations Carrying Amount Current AcquisitionRelatedObligationsCarryingAmountCurrent	33639000	USD
CY2020Q3	ctra	Acquisition Related Obligations Carrying Amount Noncurrent AcquisitionRelatedObligationsCarryingAmountNoncurrent	19286000	USD
CY2019Q4	ctra	Acquisition Related Obligations Carrying Amount Noncurrent AcquisitionRelatedObligationsCarryingAmountNoncurrent	46259000	USD
CY2019Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	224704000	USD
	ctra	Asset Retirement Obligation Accretion Expense Excluding Liabilities Heldfor Sale AssetRetirementObligationAccretionExpenseExcludingLiabilitiesHeldforSale	23806000	USD
	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	621000	USD
	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	13244000	USD
	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	16532000	USD
CY2020Q3	us-gaap	Asset Retirement Obligation AssetRetirementObligation	245843000	USD
CY2020Q3	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	34845000	USD
CY2020Q3	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	210998000	USD
	ctra	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Measurement Period Adjustments FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityMeasurementPeriodAdjustments	5738000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-2200000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-348946000	USD
CY2020Q1	ctra	Effective Income Tax Rate Reconciliation Tax Credit Alternative Minimum Tax Credit EffectiveIncomeTaxRateReconciliationTaxCreditAlternativeMinimumTaxCredit	2123000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-8880000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-20151000	USD
	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	92804000	USD
CY2020Q1	ctra	Income Taxes Receivable Alternative Minimum Tax Cares Act IncomeTaxesReceivableAlternativeMinimumTaxCARESAct	68252000	USD
	us-gaap	Unrecognized Tax Benefits Period Increase Decrease UnrecognizedTaxBenefitsPeriodIncreaseDecrease	-23800000	USD
CY2020Q3	ctra	Defined Benefit Plan Plan Assets Increase In Target Allocation Term DefinedBenefitPlanPlanAssetsIncreaseInTargetAllocationTerm	P10M
CY2020Q3	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	628000	USD
CY2019Q3	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	4158000	USD
	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	6520000	USD
	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	23461000	USD
CY2020Q3	ctra	Self Insurance Period Expense SelfInsurancePeriodExpense	17327000	USD
CY2019Q3	ctra	Self Insurance Period Expense SelfInsurancePeriodExpense	20976000	USD
	ctra	Self Insurance Period Expense SelfInsurancePeriodExpense	48430000	USD
	ctra	Self Insurance Period Expense SelfInsurancePeriodExpense	58873000	USD
CY2020Q3	us-gaap	Royalty Expense RoyaltyExpense	16176000	USD
CY2019Q3	us-gaap	Royalty Expense RoyaltyExpense	21868000	USD
	us-gaap	Royalty Expense RoyaltyExpense	52092000	USD
	us-gaap	Royalty Expense RoyaltyExpense	73119000	USD
CY2020Q3	us-gaap	Income Tax Receivable IncomeTaxReceivable	66129000	USD
CY2020Q3	ctra	Income Tax Receivable Operating Loss Carryforwards IncomeTaxReceivableOperatingLossCarryforwards	64160000	USD
CY2020Q3	ctra	Income Tax Receivable Operating Loss Carryforwards Interest IncomeTaxReceivableOperatingLossCarryforwardsInterest	5126000	USD
CY2020Q3	us-gaap	Restricted Cash RestrictedCash	131169000	USD
CY2019Q4	us-gaap	Restricted Cash RestrictedCash	134887000	USD
CY2020Q3	us-gaap	Restricted Cash Current RestrictedCashCurrent	7104000	USD
CY2019Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	12363000	USD
CY2020Q3	us-gaap	Restricted Cash Noncurrent RestrictedCashNoncurrent	124065000	USD
CY2019Q4	us-gaap	Restricted Cash Noncurrent RestrictedCashNoncurrent	122524000	USD
CY2020Q3	us-gaap	Restricted Investments RestrictedInvestments	27793000	USD
CY2019Q4	us-gaap	Restricted Investments RestrictedInvestments	21886000	USD
CY2020Q3	us-gaap	Debt Securities Trading Restricted DebtSecuritiesTradingRestricted	26015000	USD
CY2019Q4	us-gaap	Debt Securities Trading Restricted DebtSecuritiesTradingRestricted	13508000	USD
CY2020Q3	us-gaap	Held To Maturity Securities Restricted HeldToMaturitySecuritiesRestricted	1778000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Restricted HeldToMaturitySecuritiesRestricted	8378000	USD
CY2020Q3	us-gaap	Deposit Assets DepositAssets	21079000	USD
CY2019Q4	us-gaap	Deposit Assets DepositAssets	10723000	USD
	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3	segment
	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3	segment
CY2020Q3	us-gaap	Revenues Revenues	400691000	USD
CY2020Q3	ctra	Depreciation Depletion And Amortization Excluding Acquired Intangibles DepreciationDepletionAndAmortizationExcludingAcquiredIntangibles	50739000	USD
CY2020Q3	ctra	Amortizationof Intangibles AmortizationofIntangibles	2219000	USD
CY2020Q3	ctra	Adjusted Earnings Before Income Tax Interest Depreciation And Amortization AdjustedEarningsBeforeIncomeTaxInterestDepreciationAndAmortization	19687000	USD
CY2020Q3	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	27806000	USD
CY2019Q3	us-gaap	Revenues Revenues	525864000	USD
CY2019Q3	ctra	Depreciation Depletion And Amortization Excluding Acquired Intangibles DepreciationDepletionAndAmortizationExcludingAcquiredIntangibles	60842000	USD
CY2019Q3	ctra	Amortizationof Intangibles AmortizationofIntangibles	2314000	USD
CY2019Q3	ctra	Adjusted Earnings Before Income Tax Interest Depreciation And Amortization AdjustedEarningsBeforeIncomeTaxInterestDepreciationAndAmortization	40023000	USD
CY2019Q3	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	60301000	USD
	us-gaap	Revenues Revenues	1282989000	USD
	ctra	Depreciation Depletion And Amortization Excluding Acquired Intangibles DepreciationDepletionAndAmortizationExcludingAcquiredIntangibles	154466000	USD
	ctra	Amortizationof Intangibles AmortizationofIntangibles	5180000	USD
	ctra	Adjusted Earnings Before Income Tax Interest Depreciation And Amortization AdjustedEarningsBeforeIncomeTaxInterestDepreciationAndAmortization	96830000	USD
	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	118896000	USD
	us-gaap	Revenues Revenues	1791184000	USD
	ctra	Depreciation Depletion And Amortization Excluding Acquired Intangibles DepreciationDepletionAndAmortizationExcludingAcquiredIntangibles	184927000	USD
	ctra	Amortizationof Intangibles AmortizationofIntangibles	-4712000	USD
	ctra	Adjusted Earnings Before Income Tax Interest Depreciation And Amortization AdjustedEarningsBeforeIncomeTaxInterestDepreciationAndAmortization	264157000	USD
	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	144183000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-68637000	USD
CY2020Q3	us-gaap	Interest Expense InterestExpense	18389000	USD
CY2020Q3	us-gaap	Investment Income Interest InvestmentIncomeInterest	378000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-45000	USD
CY2020Q3	ctra	Depreciation Depletion And Amortization Excluding Acquired Intangibles DepreciationDepletionAndAmortizationExcludingAcquiredIntangibles	50739000	USD
CY2020Q3	ctra	Noncash Allocated Sharebased Compensation Expense NoncashAllocatedSharebasedCompensationExpense	1078000	USD
CY2020Q3	ctra	Acquisition Related Obligations Changesin Fair Value Gain Loss AcquisitionRelatedObligationsChangesinFairValueGainLoss	-3624000	USD
CY2020Q3	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	9127000	USD
CY2020Q3	ctra	Amortizationof Intangibles AmortizationofIntangibles	2219000	USD
CY2020Q3	ctra	Adjusted Earnings Before Income Tax Interest Depreciation And Amortization AdjustedEarningsBeforeIncomeTaxInterestDepreciationAndAmortization	19687000	USD
CY2020Q3	us-gaap	Asset Impairment Charges AssetImpairmentCharges	3516000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-43561000	USD
CY2019Q3	us-gaap	Interest Expense InterestExpense	18847000	USD
CY2019Q3	us-gaap	Investment Income Interest InvestmentIncomeInterest	1763000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-3102000	USD
CY2019Q3	ctra	Depreciation Depletion And Amortization Excluding Acquired Intangibles DepreciationDepletionAndAmortizationExcludingAcquiredIntangibles	60842000	USD
CY2019Q3	ctra	Business Acquisition Integrationand Other Related Costs BusinessAcquisitionIntegrationandOtherRelatedCosts	68000	USD
CY2019Q3	ctra	Noncash Allocated Sharebased Compensation Expense NoncashAllocatedSharebasedCompensationExpense	2738000	USD
CY2019Q3	ctra	Acquisition Related Obligations Fair Value Adjustment AcquisitionRelatedObligationsFairValueAdjustment	3238000	USD
CY2019Q3	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	6846000	USD
CY2019Q3	us-gaap	Asset Impairment Charges AssetImpairmentCharges	32000	USD
CY2019Q3	ctra	Amortizationof Intangibles AmortizationofIntangibles	2314000	USD
CY2019Q3	ctra	Adjusted Earnings Before Income Tax Interest Depreciation And Amortization AdjustedEarningsBeforeIncomeTaxInterestDepreciationAndAmortization	40023000	USD
	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-346746000	USD
	us-gaap	Interest Expense InterestExpense	54808000	USD
	us-gaap	Investment Income Interest InvestmentIncomeInterest	6889000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-2200000	USD
	ctra	Depreciation Depletion And Amortization Excluding Acquired Intangibles DepreciationDepletionAndAmortizationExcludingAcquiredIntangibles	154466000	USD
	ctra	Noncash Allocated Sharebased Compensation Expense NoncashAllocatedSharebasedCompensationExpense	4200000	USD
	ctra	Acquisition Related Obligations Fair Value Adjustment AcquisitionRelatedObligationsFairValueAdjustment	13425000	USD
	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	23806000	USD
	ctra	Defined Benefit Planand Other Benefit Plan Settlement Gain Loss DefinedBenefitPlanandOtherBenefitPlanSettlementGainLoss	-1230000	USD
	ctra	Amortizationof Intangibles AmortizationofIntangibles	5180000	USD
	ctra	Adjusted Earnings Before Income Tax Interest Depreciation And Amortization AdjustedEarningsBeforeIncomeTaxInterestDepreciationAndAmortization	96830000	USD
	us-gaap	Asset Impairment Charges AssetImpairmentCharges	198963000	USD
	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-11271000	USD
	us-gaap	Interest Expense InterestExpense	50079000	USD
	us-gaap	Investment Income Interest InvestmentIncomeInterest	5584000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-8880000	USD
	ctra	Depreciation Depletion And Amortization Excluding Acquired Intangibles DepreciationDepletionAndAmortizationExcludingAcquiredIntangibles	184927000	USD
	ctra	Business Acquisition Integrationand Other Related Costs BusinessAcquisitionIntegrationandOtherRelatedCosts	1055000	USD
	ctra	Noncash Allocated Sharebased Compensation Expense NoncashAllocatedSharebasedCompensationExpense	7463000	USD
	ctra	Acquisition Related Obligations Fair Value Adjustment AcquisitionRelatedObligationsFairValueAdjustment	288000	USD
	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	19925000	USD
	ctra	Gain Loss On Extinguishment And Modification Of Debt GainLossOnExtinguishmentAndModificationOfDebt	-26459000	USD
	us-gaap	Asset Impairment Charges AssetImpairmentCharges	5858000	USD
	ctra	Inventory Fair Value Adjustment InventoryFairValueAdjustment	8209000	USD
	us-gaap	Nonmonetary Transaction Gain Loss Recognized On Transfer NonmonetaryTransactionGainLossRecognizedOnTransfer	9083000	USD
	ctra	Amortizationof Intangibles AmortizationofIntangibles	-4712000	USD
	ctra	Adjusted Earnings Before Income Tax Interest Depreciation And Amortization AdjustedEarningsBeforeIncomeTaxInterestDepreciationAndAmortization	264157000	USD
	us-gaap	Nonmonetary Transaction Gain Loss Recognized On Transfer NonmonetaryTransactionGainLossRecognizedOnTransfer	9083000	USD
CY2020Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	399954000	USD
CY2019Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	523987000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1278935000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1784775000	USD

Files In Submission

Name	View Source	Status
0001704715-20-000048-index-headers.html	Edgar Link	pending
0001704715-20-000048-index.html	Edgar Link	pending
0001704715-20-000048.txt	Edgar Link	pending
0001704715-20-000048-xbrl.zip	Edgar Link	pending
a9302020exhibit101.htm	Edgar Link	pending
a9302020exhibit31.htm	Edgar Link	pending
a9302020exhibit32.htm	Edgar Link	pending
a9302020exhibit95.htm	Edgar Link	pending
ctra-20200930.htm	Edgar Link	pending
ctra-20200930.xsd	Edgar Link	pending
ctra-20200930_cal.xml	Edgar Link	unprocessable
ctra-20200930_def.xml	Edgar Link	unprocessable
ctra-20200930_g1.jpg	Edgar Link	pending
ctra-20200930_htm.xml	Edgar Link	completed
ctra-20200930_lab.xml	Edgar Link	unprocessable
ctra-20200930_pre.xml	Edgar Link	unprocessable
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
R1.htm	Edgar Link	pending
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$AMR
Alpha Metallurgical Resources, Inc. Stock $amr

2020 Q4 Form 10-Q Financial Statement

#000170471520000048 Filed on November 09, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AMR Alpha Metallurgical Resources, Inc. Stock $amr

2020 Q4 Form 10-Q Financial Statement

#000170471520000048 Filed on November 09, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AMR
Alpha Metallurgical Resources, Inc. Stock $amr