$CRK
COMSTOCK RESOURCES INC Stock $crk

$crk Overview Financials Valuation SEC Filings Company Website

2019 Q4 Form 10-K Financial Statement

#000002319421000015 Filed on February 17, 2021

Income Statement

Concept	2019 Q4	2018 Q3	2017 Q4
Revenue	$289.2M	$70.12M	$73.20M
YoY Change	88.44%	4.97%	50.93%
Cost Of Revenue	$69.20M	$21.80M	$15.90M
YoY Change	148.03%	39.74%	14.39%
Gross Profit	$220.0M	$81.00M	$57.30M
YoY Change	75.16%	58.2%	65.61%
Gross Profit Margin	76.06%	115.51%	78.28%
Selling, General & Admin	$6.500M	$6.300M	$7.000M
YoY Change	-19.75%	1.61%	-17.65%
% of Gross Profit	2.95%	7.78%	12.22%
Research & Development	$0.00		$0.00
YoY Change
% of Gross Profit	0.0%		0.0%
Depreciation & Amortization	$111.8M	$14.08M	$30.60M
YoY Change	209.7%	-57.08%	5.15%
% of Gross Profit	50.82%	17.39%	53.4%
Operating Expenses	$118.4M	$24.36M	$37.60M
YoY Change	167.87%	-37.54%	-0.27%
Operating Profit	$101.7M	$34.58M	-$24.22M
YoY Change	24.84%	209.03%	317.3%
Interest Expense	-$34.30M	$22.14M	-$37.00M
YoY Change	110.43%	-161.16%	-17.23%
% of Operating Profit	-33.73%	64.02%
Other Income/Expense, Net	$300.0K	-$24.49M	$100.0K
YoY Change	200.0%	-12344.0%	0.0%
Pretax Income	$67.70M	-$16.26M	-$61.10M
YoY Change	3.68%	-34.45%	18.64%
Income Tax	$12.60M	$3.940M	$300.0K
% Of Pretax Income	18.61%
Net Earnings	$55.12M	$13.82M	-$42.30M
YoY Change	9.58%	-155.88%	-23.0%
Net Earnings / Revenue	19.05%	19.71%	-57.78%
Basic Earnings Per Share	$0.22	$0.13
Diluted Earnings Per Share	$0.19	$0.13	-$2.858M
COMMON SHARES
Basic Shares Outstanding	190.0M	15.47M
Diluted Shares Outstanding		15.47M

Balance Sheet

Concept	2019 Q4	2018 Q3	2017 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$18.50M	$31.80M	$61.30M
YoY Change	-20.26%	25.2%	-6.98%
Cash & Equivalents	$18.53M	$894.2M	$61.26M
Short-Term Investments
Other Short-Term Assets	$10.40M	$19.10M	$4.100M
YoY Change	-24.8%	235.09%	124.78%
Inventory
Prepaid Expenses
Receivables	$120.1M	$80.60M	$237.2M
Other Receivables	$5.200M	$0.00	$0.00
Total Short-Term Assets	$289.7M	$131.5M	$302.5M
YoY Change	81.7%	100.76%	235.47%
LONG-TERM ASSETS
Property, Plant & Equipment	$4.009B	$1.594B	$607.9M
YoY Change	140.34%	91.26%	-23.89%
Goodwill	$335.9M	$335.9M
YoY Change	0.0%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$231.0K	$500.0K	$900.0K
YoY Change	11450.0%	-44.44%	-10.0%
Total Long-Term Assets	$4.367B	$1.963B	$627.9M
YoY Change	115.31%	135.33%	-21.49%
TOTAL ASSETS
Total Short-Term Assets	$289.7M	$131.5M	$302.5M
Total Long-Term Assets	$4.367B	$1.963B	$627.9M
Total Assets	$4.657B	$2.094B	$930.4M
YoY Change	112.86%	132.81%	4.55%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$253.0M	$124.0M	$126.0M
YoY Change	82.32%	34.34%	178.15%
Accrued Expenses	$137.2M	$53.30M	$42.50M
YoY Change	101.46%	209.88%	5.2%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$392.4M	$180.1M	$168.5M
YoY Change	89.69%	60.52%	83.75%
LONG-TERM LIABILITIES
Long-Term Debt	$2.500B	$1.243B	$1.111B
YoY Change	100.92%	14.05%	6.32%
Other Long-Term Liabilities	$6.351M	$4.700M	$10.40M
YoY Change	24.53%	-70.81%	-34.18%
Total Long-Term Liabilities	$2.506B	$1.248B	$1.121B
YoY Change	101.43%	12.81%	5.72%
TOTAL LIABILITIES
Total Short-Term Liabilities	$392.4M	$180.1M	$168.5M
Total Long-Term Liabilities	$2.506B	$1.248B	$1.121B
Total Liabilities	$3.135B	$1.573B	$1.300B
YoY Change	93.7%	28.11%	11.94%
SHAREHOLDERS EQUITY
Retained Earnings	$138.6M
YoY Change	116.14%
Common Stock	$95.00M
YoY Change	-81.2%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$1.143B	-$458.5M	-$369.3M
YoY Change
Total Liabilities & Shareholders Equity	$4.657B	$2.094B	$930.4M
YoY Change	112.86%	132.81%	4.55%

Cashflow Statement

Concept	2019 Q4	2018 Q3	2017 Q4
OPERATING ACTIVITIES
Net Income	$55.12M	$13.82M	-$42.30M
YoY Change	9.58%	-155.88%	-23.0%
Depreciation, Depletion And Amortization	$111.8M	$14.08M	$30.60M
YoY Change	209.7%	-57.08%	5.15%
Cash From Operating Activities	$168.4M	$3.609M	$83.80M
YoY Change	70.62%	-89.78%	170.32%
INVESTING ACTIVITIES
Capital Expenditures	-$178.1M	$59.02M	-$48.00M
YoY Change	60.74%	-226.37%	194.48%
Acquisitions
YoY Change
Other Investing Activities	$100.0K	$7.400M	$0.00
YoY Change	-112.5%	393.33%	-100.0%
Cash From Investing Activities	-$177.9M	-$50.05M	-$48.00M
YoY Change	59.55%	10.72%	-605.26%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net		$1.291B
YoY Change
Cash From Financing Activities	-25.20M	-816.0M	0.000
YoY Change	-686.05%		-100.0%
NET CHANGE
Cash From Operating Activities	168.4M	3.609M	83.80M
Cash From Investing Activities	-177.9M	-50.05M	-48.00M
Cash From Financing Activities	-25.20M	-816.0M	0.000
Net Change In Cash	-34.70M	-862.4M	35.80M
YoY Change	308.24%	8611.18%	-8.91%
FREE CASH FLOW
Cash From Operating Activities	$168.4M	$3.609M	$83.80M
Capital Expenditures	-$178.1M	$59.02M	-$48.00M
Free Cash Flow	$346.5M	-$55.41M	$131.8M
YoY Change	65.39%	-167.57%	178.65%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2020	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
CY2020	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2020	dei	Entity Central Index Key EntityCentralIndexKey	0000023194
CY2020	dei	Document Type DocumentType	10-K
CY2020	dei	Document Annual Report DocumentAnnualReport	true
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-12-31
CY2020	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2020	dei	Document Transition Report DocumentTransitionReport	false
CY2020	dei	Entity File Number EntityFileNumber	001-03262
CY2020	dei	Entity Registrant Name EntityRegistrantName	COMSTOCK RESOURCES, INC.
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	NV
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	94-1667468
CY2020	dei	Entity Address Address Line1 EntityAddressAddressLine1	5300 Town and Country Blvd.
CY2020	dei	Entity Address Address Line2 EntityAddressAddressLine2	Suite 500
CY2020	dei	Entity Address City Or Town EntityAddressCityOrTown	Frisco
CY2020	dei	Entity Address State Or Province EntityAddressStateOrProvince	TX
CY2020	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	75034
CY2020	dei	City Area Code CityAreaCode	972
CY2020	dei	Local Phone Number LocalPhoneNumber	668-8800
CY2020	dei	Security12b Title Security12bTitle	Common Stock, par value $0.50 (per share)
CY2020	dei	Trading Symbol TradingSymbol	CRK
CY2020	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2020	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No
CY2020	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2020	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2020	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2020	dei	Entity Filer Category EntityFilerCategory	Accelerated Filer
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CY2020	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-224659000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-91689000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	83066000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	124692000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-61627000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1065000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	18944000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	27803000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-9210000	USD
	us-gaap	Net Income Loss NetIncomeLoss	-92754000	USD
	us-gaap	Net Income Loss NetIncomeLoss	64122000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	96889000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	-52417000	USD
	crk	Preferred Stock Dividends And Accretion PreferredStockDividendsAndAccretion	0	USD
	crk	Preferred Stock Dividends And Accretion PreferredStockDividendsAndAccretion	0	USD
CY2019	crk	Preferred Stock Dividends And Accretion PreferredStockDividendsAndAccretion	22415000	USD
CY2020	crk	Preferred Stock Dividends And Accretion PreferredStockDividendsAndAccretion	30996000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-92754000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	64122000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	74474000	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-83413000	USD
	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	-6.08
	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.61
CY2019	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	0.52
CY2020	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	-0.39
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	15262000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	105453000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	142750000	shares
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	215194000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	15262000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	105459000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	187378000	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	215194000	shares
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	-369272000	USD
	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	3912000	USD
	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	369000	USD
	us-gaap	Stock Issued During Period Value Conversion Of Convertible Securities StockIssuedDuringPeriodValueConversionOfConvertibleSecurities	29000	USD
	us-gaap	Net Income Loss NetIncomeLoss	-92754000	USD
CY2018Q3	us-gaap	Stockholders Equity StockholdersEquity	-458454000	USD
CY2018Q3	crk	Issuance Of Successor Common Stock Value IssuanceOfSuccessorCommonStockValue	140531000	USD
	crk	Stock Issued Value Contribution Transaction StockIssuedValueContributionTransaction	360188000	USD
	crk	Stock Issued Value Vesting Of Equity Awards StockIssuedValueVestingOfEquityAwards	8826000	USD
	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	4695000	USD
	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	994000	USD
	crk	Stock Issuance Costs During Period Value Contribution Transaction StockIssuanceCostsDuringPeriodValueContributionTransaction	-395000	USD
	us-gaap	Net Income Loss NetIncomeLoss	64122000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	569571000	USD
CY2019	crk	Stock Issued Value Contribution Transaction StockIssuedValueContributionTransaction	-1969000	USD
CY2019	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	4020000	USD
CY2019	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	498633000	USD
CY2019	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	220000	USD
CY2019	crk	Equity Issuance Costs During Period Value EquityIssuanceCostsDuringPeriodValue	-1487000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	96889000	USD
CY2019	us-gaap	Preferred Stock Accretion Of Redemption Discount PreferredStockAccretionOfRedemptionDiscount	4583000	USD
CY2019	crk	Temporary Equity Dividends On Temporary Equity Value TemporaryEquityDividendsOnTemporaryEquityValue	17832000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	1143022000	USD
CY2020	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	6464000	USD
CY2020	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	211638000	USD
CY2020	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	692000	USD
CY2020	crk	Stock Issuance Costs During Period Value Contribution Transaction StockIssuanceCostsDuringPeriodValueContributionTransaction	-10246000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	-52417000	USD
CY2020	us-gaap	Preferred Stock Accretion Of Redemption Discount PreferredStockAccretionOfRedemptionDiscount	5417000	USD
CY2020	crk	Temporary Equity Dividends On Temporary Equity Value TemporaryEquityDividendsOnTemporaryEquityValue	25579000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	1266773000	USD
	us-gaap	Profit Loss ProfitLoss	-92754000	USD
	us-gaap	Profit Loss ProfitLoss	64122000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	96889000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	-52417000	USD
	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	1052000	USD
	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	29079000	USD
CY2019	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	28026000	USD
CY2020	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	-9409000	USD
	us-gaap	Exploration Abandonment And Impairment Expense ExplorationAbandonmentAndImpairmentExpense	0	USD
	us-gaap	Exploration Abandonment And Impairment Expense ExplorationAbandonmentAndImpairmentExpense	0	USD
CY2019	us-gaap	Exploration Abandonment And Impairment Expense ExplorationAbandonmentAndImpairmentExpense	0	USD
CY2020	us-gaap	Exploration Abandonment And Impairment Expense ExplorationAbandonmentAndImpairmentExpense	27000	USD
	us-gaap	Gain Loss On Sale Of Property GainLossOnSaleOfProperty	-35438000	USD
	us-gaap	Gain Loss On Sale Of Property GainLossOnSaleOfProperty	155000	USD
CY2019	us-gaap	Gain Loss On Sale Of Property GainLossOnSaleOfProperty	-25000	USD
CY2020	us-gaap	Gain Loss On Sale Of Property GainLossOnSaleOfProperty	17000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	68032000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	53944000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	276526000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	417112000	USD
	us-gaap	Gain Loss On Sale Of Commodity Contracts GainLossOnSaleOfCommodityContracts	881000	USD
	us-gaap	Gain Loss On Sale Of Commodity Contracts GainLossOnSaleOfCommodityContracts	10465000	USD
CY2019	us-gaap	Gain Loss On Sale Of Commodity Contracts GainLossOnSaleOfCommodityContracts	51735000	USD
CY2020	us-gaap	Gain Loss On Sale Of Commodity Contracts GainLossOnSaleOfCommodityContracts	9951000	USD
	crk	Derivative Cash Paid Received On Hedge DerivativeCashPaidReceivedOnHedge	-2842000	USD
	crk	Derivative Cash Paid Received On Hedge DerivativeCashPaidReceivedOnHedge	5579000	USD
CY2019	crk	Derivative Cash Paid Received On Hedge DerivativeCashPaidReceivedOnHedge	-52684000	USD
CY2020	crk	Derivative Cash Paid Received On Hedge DerivativeCashPaidReceivedOnHedge	-134496000	USD
	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	29457000	USD
	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	2404000	USD
CY2019	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	16274000	USD
CY2020	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	34038000	USD
	us-gaap	Paid In Kind Interest PaidInKindInterest	25004000	USD
	us-gaap	Paid In Kind Interest PaidInKindInterest	0	USD
CY2019	us-gaap	Paid In Kind Interest PaidInKindInterest	0	USD
CY2020	us-gaap	Paid In Kind Interest PaidInKindInterest	0	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	3912000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	994000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	4020000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	6464000	USD
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2020	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-861000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-2834000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	61048000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-3220000	USD
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-34555000	USD
	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	-337000	USD
	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	12527000	USD
CY2019	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	-9823000	USD
CY2020	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	-7019000	USD
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	10462000	USD
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	41533000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	15485000	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	12923000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	85735000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	102302000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	575701000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	451237000	USD
	crk	Payments To Acquire Business Net For Cash Acquired From Acquisition PaymentsToAcquireBusinessNetForCashAcquiredFromAcquisition	0	USD
	crk	Payments To Acquire Business Net For Cash Acquired From Acquisition PaymentsToAcquireBusinessNetForCashAcquiredFromAcquisition	0	USD
CY2019	crk	Payments To Acquire Business Net For Cash Acquired From Acquisition PaymentsToAcquireBusinessNetForCashAcquiredFromAcquisition	693869000	USD
CY2020	crk	Payments To Acquire Business Net For Cash Acquired From Acquisition PaymentsToAcquireBusinessNetForCashAcquiredFromAcquisition	0	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	150106000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	169786000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	486781000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	509690000	USD
	crk	Advance Payments For Drilling Costs AdvancePaymentsForDrillingCosts	3692000	USD
	crk	Advance Payments For Drilling Costs AdvancePaymentsForDrillingCosts	5644000	USD
CY2019	crk	Advance Payments For Drilling Costs AdvancePaymentsForDrillingCosts	-9336000	USD
CY2020	crk	Advance Payments For Drilling Costs AdvancePaymentsForDrillingCosts	1795000	USD
	crk	Proceeds From Payments For Sale Of Oil And Gas Properties ProceedsFromPaymentsForSaleOfOilAndGasProperties	103593000	USD
	crk	Proceeds From Payments For Sale Of Oil And Gas Properties ProceedsFromPaymentsForSaleOfOilAndGasProperties	13796000	USD
CY2019	crk	Proceeds From Payments For Sale Of Oil And Gas Properties ProceedsFromPaymentsForSaleOfOilAndGasProperties	475000	USD
CY2020	crk	Proceeds From Payments For Sale Of Oil And Gas Properties ProceedsFromPaymentsForSaleOfOilAndGasProperties	287000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-50205000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-161634000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1170839000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-511198000	USD
	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	865577000	USD
	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	450000000	USD
CY2019	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	927000000	USD
CY2020	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	157000000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2019	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2020	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	751500000	USD
	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	49679000	USD
	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	1291352000	USD
CY2019	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	127000000	USD
CY2020	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	907000000	USD
	crk	Repayments Of Lines Of Credit From Acquisition RepaymentsOfLinesOfCreditFromAcquisition	0	USD
	crk	Repayments Of Lines Of Credit From Acquisition RepaymentsOfLinesOfCreditFromAcquisition	0	USD
CY2019	crk	Repayments Of Lines Of Credit From Acquisition RepaymentsOfLinesOfCreditFromAcquisition	533390000	USD
CY2020	crk	Repayments Of Lines Of Credit From Acquisition RepaymentsOfLinesOfCreditFromAcquisition	0	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	300000000	USD
CY2020	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	206626000	USD
	us-gaap	Proceeds From Issuance Of Convertible Preferred Stock ProceedsFromIssuanceOfConvertiblePreferredStock	0	USD
	us-gaap	Proceeds From Issuance Of Convertible Preferred Stock ProceedsFromIssuanceOfConvertiblePreferredStock	0	USD
CY2019	us-gaap	Proceeds From Issuance Of Convertible Preferred Stock ProceedsFromIssuanceOfConvertiblePreferredStock	175000000	USD
CY2020	us-gaap	Proceeds From Issuance Of Convertible Preferred Stock ProceedsFromIssuanceOfConvertiblePreferredStock	0	USD
	us-gaap	Payments For Repurchase Of Preferred Stock And Preference Stock PaymentsForRepurchaseOfPreferredStockAndPreferenceStock	0	USD
	us-gaap	Payments For Repurchase Of Preferred Stock And Preference Stock PaymentsForRepurchaseOfPreferredStockAndPreferenceStock	0	USD
CY2019	us-gaap	Payments For Repurchase Of Preferred Stock And Preference Stock PaymentsForRepurchaseOfPreferredStockAndPreferenceStock	0	USD
CY2020	us-gaap	Payments For Repurchase Of Preferred Stock And Preference Stock PaymentsForRepurchaseOfPreferredStockAndPreferenceStock	210000000	USD
	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	0	USD
	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	0	USD
CY2019	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	17832000	USD
CY2020	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	25580000	USD
	us-gaap	Proceeds From Contributions From Affiliates ProceedsFromContributionsFromAffiliates	0	USD
	us-gaap	Proceeds From Contributions From Affiliates ProceedsFromContributionsFromAffiliates	40736000	USD
CY2019	us-gaap	Proceeds From Contributions From Affiliates ProceedsFromContributionsFromAffiliates	0	USD
CY2020	us-gaap	Proceeds From Contributions From Affiliates ProceedsFromContributionsFromAffiliates	0	USD
	us-gaap	Payment Of Financing And Stock Issuance Costs PaymentOfFinancingAndStockIssuanceCosts	18127000	USD
	us-gaap	Payment Of Financing And Stock Issuance Costs PaymentOfFinancingAndStockIssuanceCosts	6351000	USD
CY2019	us-gaap	Payment Of Financing And Stock Issuance Costs PaymentOfFinancingAndStockIssuanceCosts	8617000	USD
CY2020	us-gaap	Payment Of Financing And Stock Issuance Costs PaymentOfFinancingAndStockIssuanceCosts	24617000	USD
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	369000	USD
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	4695000	USD
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	220000	USD
CY2020	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	692000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	797402000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-811662000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	714941000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-52763000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	832932000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-870994000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-4661000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	11740000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	61255000	USD
CY2018Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	894187000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	23193000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	18532000	USD
CY2018Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	894187000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	23193000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	18532000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	30272000	USD
CY2019Q3	crk	Management Gas Price Outlook ManagementGasPriceOutlook	3.32
CY2019Q3	crk	Minimum Discount Factor To Future Net Cash Flows Percentage MinimumDiscountFactorToFutureNetCashFlowsPercentage	0.10
CY2018Q3	crk	Stock Issued During Period Shares Contribution Transaction StockIssuedDuringPeriodSharesContributionTransaction	88571429	shares
CY2018Q3	crk	Stock Issued Ownership Percentage Contribution Transaction StockIssuedOwnershipPercentageContributionTransaction	0.84
CY2019Q3	crk	Management Oil Price Outlook ManagementOilPriceOutlook	74.80
CY2019Q3	crk	Maximum Discount Factor To Future Net Cash Flows Percentage MaximumDiscountFactorToFutureNetCashFlowsPercentage	0.25
CY2020	us-gaap	Use Of Estimates UseOfEstimates	<div style="margin-top:10pt;text-align:justify;text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-style:italic;font-weight:700;line-height:120%">Use of Estimates in the Preparation of Financial Statements</span></div><div style="margin-top:10pt;text-align:justify;text-indent:27pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">The preparation of financial statements in conformity with generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual amounts could differ from those estimates. Changes in the future estimated oil and natural gas reserves or the estimated future cash flows attributable to the reserves that are utilized for impairment analyses could have a significant impact on the future results of operations.</span></div>
CY2020	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Gain Loss Included In Earnings FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings	15943000	USD
CY2019Q4	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis With Unobservable Inputs FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs	4351000	USD
CY2019	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Gain Loss Included In Earnings FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings	4351000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	0	USD
CY2019Q4	us-gaap	Other Assets Current OtherAssetsCurrent	10399000	USD
CY2020Q4	us-gaap	Other Assets Current OtherAssetsCurrent	14839000	USD
CY2018Q4	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis With Unobservable Inputs FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs	0	USD
CY2019	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Settlements FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSettlements	0	USD
CY2020	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Transfers Out Of Level3 FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersOutOfLevel3	-11630000	USD
CY2019Q4	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis With Unobservable Inputs FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs	4351000	USD
CY2020Q4	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis With Unobservable Inputs FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs	-22588000	USD
CY2020	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Settlements FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSettlements	-31252000	USD
CY2019	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Transfers Out Of Level3 FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersOutOfLevel3	0	USD
CY2019Q4	us-gaap	Goodwill Goodwill	335900000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	335900000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	3500000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	3000000.0	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	22569000	USD
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	35814000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	2000000.0	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	2500000	USD
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P1Y11M15D
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P1Y6M14D
CY2019Q4	us-gaap	Lessee Operating Lease Discount Rate LesseeOperatingLeaseDiscountRate	0.050
CY2020Q4	us-gaap	Lessee Operating Lease Discount Rate LesseeOperatingLeaseDiscountRate	0.043
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	2366000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	562000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	196000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	3124000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	99000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	3025000	USD
CY2019Q4	us-gaap	Interest Payable Current InterestPayableCurrent	39501000	USD
CY2020Q4	us-gaap	Interest Payable Current InterestPayableCurrent	67265000	USD
CY2019Q4	crk	Accrued Drilling Costs AccruedDrillingCosts	42193000	USD
CY2020Q4	crk	Accrued Drilling Costs AccruedDrillingCosts	24959000	USD
CY2019Q4	crk	Accrued Transportation Costs AccruedTransportationCosts	26907000	USD
CY2020Q4	crk	Accrued Transportation Costs AccruedTransportationCosts	25353000	USD
CY2019Q4	crk	Accrued Transaction Costs AccruedTransactionCosts	10830000	USD
CY2020Q4	crk	Accrued Transaction Costs AccruedTransactionCosts	462000	USD
CY2019Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	8653000	USD
CY2020Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	7519000	USD
CY2019Q4	crk	Accrued Lease Operating Expenses AccruedLeaseOperatingExpenses	4990000	USD
CY2020Q4	crk	Accrued Lease Operating Expenses AccruedLeaseOperatingExpenses	3466000	USD
CY2019Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	4092000	USD
CY2020Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	3995000	USD
CY2019Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	137166000	USD
CY2020Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	133019000	USD
CY2018Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	5136000	USD
CY2019Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	18151000	USD
CY2019	crk	Asset Retirement Obligation Liabilities For Wells Acquired AssetRetirementObligationLiabilitiesForWellsAcquired	5700000	USD
CY2020	crk	Asset Retirement Obligation Liabilities For Wells Acquired AssetRetirementObligationLiabilitiesForWellsAcquired	0	USD
CY2019	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	516000	USD
CY2020	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	733000	USD
CY2019	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	6333000	USD
CY2020	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	-699000	USD
CY2019	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	57000	USD
CY2020	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	80000	USD
CY2019	crk	Asset Retirement Obligation Assets Disposed AssetRetirementObligationAssetsDisposed	45000	USD
CY2020	crk	Asset Retirement Obligation Assets Disposed AssetRetirementObligationAssetsDisposed	0	USD
CY2019	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	568000	USD
CY2020	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	1185000	USD
CY2019Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	18151000	USD
CY2020Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	19290000	USD
CY2020Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	125000000.0	USD
CY2020	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	1	segment
CY2020	crk	Number Of Primary Products NumberOfPrimaryProducts	2	product
CY2020	crk	Contract Cash Settlement Max Days ContractCashSettlementMaxDays	P25D
CY2020	crk	Contract Cancellable Notice Term ContractCancellableNoticeTerm	P30D
CY2019Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	120100000	USD
	crk	General And Administrative Expense Reimbursements Of Overhead Costs GeneralAndAdministrativeExpenseReimbursementsOfOverheadCosts	8500000	USD
	crk	General And Administrative Expense Reimbursements Of Overhead Costs GeneralAndAdministrativeExpenseReimbursementsOfOverheadCosts	4500000	USD
CY2019	crk	General And Administrative Expense Reimbursements Of Overhead Costs GeneralAndAdministrativeExpenseReimbursementsOfOverheadCosts	16800000	USD
CY2020	crk	General And Administrative Expense Reimbursements Of Overhead Costs GeneralAndAdministrativeExpenseReimbursementsOfOverheadCosts	24700000	USD
	crk	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Option Nonvested Weighted Average Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionNonvestedWeightedAverageNumber	839000	shares
	crk	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Option Nonvested Weighted Average Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionNonvestedWeightedAverageNumber	410000	shares
CY2019	crk	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Option Nonvested Weighted Average Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionNonvestedWeightedAverageNumber	685000	shares
	crk	Antidilutive Securities Performance Share Units Excluded From Computation Of Eps Amount AntidilutiveSecuritiesPerformanceShareUnitsExcludedFromComputationOfEPSAmount	476000	shares
	crk	Antidilutive Securities Excluded From Computation Of Earnings Per Unit Weighted Average Convertible Preferred Stock AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerUnitWeightedAverageConvertiblePreferredStock	0	shares
CY2020	crk	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Option Nonvested Weighted Average Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionNonvestedWeightedAverageNumber	1149000	shares
CY2020	crk	Performance Units Adjustment For Performance Multiplier Range Minimum PerformanceUnitsAdjustmentForPerformanceMultiplierRangeMinimum	0
CY2020	crk	Performance Units Adjustment For Performance Multiplier Range Maximum PerformanceUnitsAdjustmentForPerformanceMultiplierRangeMaximum	2
CY2020Q4	us-gaap	Class Of Warrant Or Right Exercise Price Of Warrants Or Rights1 ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1	0.01
CY2020	crk	Temporary Equity Stock Conversion Price TemporaryEquityStockConversionPrice	4.00
	crk	Antidilutive Securities Performance Share Units Excluded From Computation Of Eps Amount AntidilutiveSecuritiesPerformanceShareUnitsExcludedFromComputationOfEPSAmount	328000	shares
CY2019	crk	Antidilutive Securities Performance Share Units Excluded From Computation Of Eps Amount AntidilutiveSecuritiesPerformanceShareUnitsExcludedFromComputationOfEPSAmount	0	shares
CY2020	crk	Antidilutive Securities Performance Share Units Excluded From Computation Of Eps Amount AntidilutiveSecuritiesPerformanceShareUnitsExcludedFromComputationOfEPSAmount	632000	shares
	crk	Antidilutive Securities Excluded From Computation Of Earnings Per Unit Weighted Average Grant Date Fair Value Price AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerUnitWeightedAverageGrantDateFairValuePrice	13.83
	crk	Antidilutive Securities Excluded From Computation Of Earnings Per Unit Weighted Average Grant Date Fair Value Price AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerUnitWeightedAverageGrantDateFairValuePrice	12.93
CY2019	crk	Antidilutive Securities Excluded From Computation Of Earnings Per Unit Weighted Average Grant Date Fair Value Price AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerUnitWeightedAverageGrantDateFairValuePrice	0
CY2020	crk	Antidilutive Securities Excluded From Computation Of Earnings Per Unit Weighted Average Grant Date Fair Value Price AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerUnitWeightedAverageGrantDateFairValuePrice	9.33
	crk	Antidilutive Securities Excluded From Computation Of Earnings Per Unit Weighted Average Convertible Preferred Stock AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerUnitWeightedAverageConvertiblePreferredStock	0	shares
CY2019	crk	Antidilutive Securities Excluded From Computation Of Earnings Per Unit Weighted Average Convertible Preferred Stock AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerUnitWeightedAverageConvertiblePreferredStock	0	shares
CY2020	crk	Antidilutive Securities Excluded From Computation Of Earnings Per Unit Weighted Average Convertible Preferred Stock AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerUnitWeightedAverageConvertiblePreferredStock	63832000	shares
	crk	Antidilutive Securities Warrants For Common Stock Excluded From Computation Of Eps Amount AntidilutiveSecuritiesWarrantsForCommonStockExcludedFromComputationOfEPSAmount	142000	shares
	crk	Antidilutive Securities Warrants For Common Stock Excluded From Computation Of Eps Amount AntidilutiveSecuritiesWarrantsForCommonStockExcludedFromComputationOfEPSAmount	0	shares
CY2019	crk	Antidilutive Securities Warrants For Common Stock Excluded From Computation Of Eps Amount AntidilutiveSecuritiesWarrantsForCommonStockExcludedFromComputationOfEPSAmount	0	shares
CY2020	crk	Antidilutive Securities Warrants For Common Stock Excluded From Computation Of Eps Amount AntidilutiveSecuritiesWarrantsForCommonStockExcludedFromComputationOfEPSAmount	0	shares
	crk	Antidilutive Securities Contingently Convertible Shares Excluded From Computation Of Eps Amount AntidilutiveSecuritiesContingentlyConvertibleSharesExcludedFromComputationOfEPSAmount	39819000	shares
	crk	Antidilutive Securities Contingently Convertible Shares Excluded From Computation Of Eps Amount AntidilutiveSecuritiesContingentlyConvertibleSharesExcludedFromComputationOfEPSAmount	0	shares
CY2019	crk	Antidilutive Securities Contingently Convertible Shares Excluded From Computation Of Eps Amount AntidilutiveSecuritiesContingentlyConvertibleSharesExcludedFromComputationOfEPSAmount	0	shares
CY2020	crk	Antidilutive Securities Contingently Convertible Shares Excluded From Computation Of Eps Amount AntidilutiveSecuritiesContingentlyConvertibleSharesExcludedFromComputationOfEPSAmount	0	shares
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-92754000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	64122000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	74474000	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-83413000	USD
	crk	Net Income Loss Allocated To Unvested Restricted Shares NetIncomeLossAllocatedToUnvestedRestrictedShares	0	USD
	crk	Net Income Loss Allocated To Unvested Restricted Shares NetIncomeLossAllocatedToUnvestedRestrictedShares	-248000	USD
CY2019	crk	Net Income Loss Allocated To Unvested Restricted Shares NetIncomeLossAllocatedToUnvestedRestrictedShares	-356000	USD
CY2020	crk	Net Income Loss Allocated To Unvested Restricted Shares NetIncomeLossAllocatedToUnvestedRestrictedShares	0	USD
	crk	Net Income Loss Available To Common Stockholders After Unvested Restricted Shares NetIncomeLossAvailableToCommonStockholdersAfterUnvestedRestrictedShares	-92754000	USD
	crk	Net Income Loss Available To Common Stockholders After Unvested Restricted Shares NetIncomeLossAvailableToCommonStockholdersAfterUnvestedRestrictedShares	63874000	USD
CY2019	crk	Net Income Loss Available To Common Stockholders After Unvested Restricted Shares NetIncomeLossAvailableToCommonStockholdersAfterUnvestedRestrictedShares	74118000	USD
CY2020	crk	Net Income Loss Available To Common Stockholders After Unvested Restricted Shares NetIncomeLossAvailableToCommonStockholdersAfterUnvestedRestrictedShares	-83413000	USD
	crk	Income Loss Allocable To Convertible Preferred Stock IncomeLossAllocableToConvertiblePreferredStock	0	USD
	crk	Income Loss Allocable To Convertible Preferred Stock IncomeLossAllocableToConvertiblePreferredStock	0	USD
CY2019	crk	Income Loss Allocable To Convertible Preferred Stock IncomeLossAllocableToConvertiblePreferredStock	22415000	USD
CY2020	crk	Income Loss Allocable To Convertible Preferred Stock IncomeLossAllocableToConvertiblePreferredStock	0	USD
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-92754000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	63874000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	96533000	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-83413000	USD
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	15262000	shares
CY2020	crk	Incremental Common Shares Attributable To Performance Stock Units IncrementalCommonSharesAttributableToPerformanceStockUnits	0	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	105453000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	142750000	shares
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	215194000	shares
	crk	Incremental Common Shares Attributable To Performance Stock Units IncrementalCommonSharesAttributableToPerformanceStockUnits	0	shares
	crk	Incremental Common Shares Attributable To Performance Stock Units IncrementalCommonSharesAttributableToPerformanceStockUnits	0	shares
CY2019	crk	Incremental Common Shares Attributable To Performance Stock Units IncrementalCommonSharesAttributableToPerformanceStockUnits	63000	shares
	us-gaap	Incremental Common Shares Attributable To Conversion Of Preferred Stock IncrementalCommonSharesAttributableToConversionOfPreferredStock	0	shares
	us-gaap	Incremental Common Shares Attributable To Conversion Of Preferred Stock IncrementalCommonSharesAttributableToConversionOfPreferredStock	0	shares
CY2019	us-gaap	Incremental Common Shares Attributable To Conversion Of Preferred Stock IncrementalCommonSharesAttributableToConversionOfPreferredStock	44565000	shares
CY2020	us-gaap	Incremental Common Shares Attributable To Conversion Of Preferred Stock IncrementalCommonSharesAttributableToConversionOfPreferredStock	0	shares
	us-gaap	Incremental Common Shares Attributable To Call Options And Warrants IncrementalCommonSharesAttributableToCallOptionsAndWarrants	0	shares
	us-gaap	Incremental Common Shares Attributable To Call Options And Warrants IncrementalCommonSharesAttributableToCallOptionsAndWarrants	6000	shares
CY2019	us-gaap	Incremental Common Shares Attributable To Call Options And Warrants IncrementalCommonSharesAttributableToCallOptionsAndWarrants	0	shares
CY2020	us-gaap	Incremental Common Shares Attributable To Call Options And Warrants IncrementalCommonSharesAttributableToCallOptionsAndWarrants	0	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	15262000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	105459000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	187378000	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	215194000	shares
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-6.08
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.61
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.52
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.39
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-6.08
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.61
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.52
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.39
	us-gaap	Interest Paid InterestPaid	36187000	USD
	us-gaap	Interest Paid InterestPaid	8042000	USD
CY2019	us-gaap	Interest Paid InterestPaid	149039000	USD
CY2020	us-gaap	Interest Paid InterestPaid	228555000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-2000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	0	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-2000	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	10218000	USD
	crk	Noncash Or Part Noncash Increase Decrease In Accrued Capital Expenditure NoncashOrPartNoncashIncreaseDecreaseInAccruedCapitalExpenditure	-3255000	USD
	crk	Noncash Or Part Noncash Increase Decrease In Accrued Capital Expenditure NoncashOrPartNoncashIncreaseDecreaseInAccruedCapitalExpenditure	15301000	USD
CY2019	crk	Noncash Or Part Noncash Increase Decrease In Accrued Capital Expenditure NoncashOrPartNoncashIncreaseDecreaseInAccruedCapitalExpenditure	24273000	USD
CY2020	crk	Noncash Or Part Noncash Increase Decrease In Accrued Capital Expenditure NoncashOrPartNoncashIncreaseDecreaseInAccruedCapitalExpenditure	-17234000	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	0	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	0	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	5372000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	1761000	USD
	us-gaap	Noncash Or Part Noncash Acquisition Debt Assumed1 NoncashOrPartNoncashAcquisitionDebtAssumed1	0	USD
	us-gaap	Noncash Or Part Noncash Acquisition Debt Assumed1 NoncashOrPartNoncashAcquisitionDebtAssumed1	0	USD
CY2019	us-gaap	Noncash Or Part Noncash Acquisition Debt Assumed1 NoncashOrPartNoncashAcquisitionDebtAssumed1	446625000	USD
CY2020	us-gaap	Noncash Or Part Noncash Acquisition Debt Assumed1 NoncashOrPartNoncashAcquisitionDebtAssumed1	0	USD
	crk	Noncash Or Part Noncash Acquisition Working Capital NoncashOrPartNoncashAcquisitionWorkingCapital	0	USD
	crk	Noncash Or Part Noncash Acquisition Working Capital NoncashOrPartNoncashAcquisitionWorkingCapital	36351000	USD
CY2019	crk	Noncash Or Part Noncash Acquisition Working Capital NoncashOrPartNoncashAcquisitionWorkingCapital	41365000	USD
CY2020	crk	Noncash Or Part Noncash Acquisition Working Capital NoncashOrPartNoncashAcquisitionWorkingCapital	520000	USD
	crk	Retirement Of Debt In Exchange For Common Stock RetirementOfDebtInExchangeForCommonStock	0	USD
	crk	Retirement Of Debt In Exchange For Common Stock RetirementOfDebtInExchangeForCommonStock	0	USD
CY2019	crk	Retirement Of Debt In Exchange For Common Stock RetirementOfDebtInExchangeForCommonStock	0	USD
CY2020	crk	Retirement Of Debt In Exchange For Common Stock RetirementOfDebtInExchangeForCommonStock	4151000	USD
	crk	Issuance Of Common Stock In Exchange For Debt IssuanceOfCommonStockInExchangeForDebt	0	USD
	crk	Issuance Of Common Stock In Exchange For Debt IssuanceOfCommonStockInExchangeForDebt	0	USD
CY2019	crk	Issuance Of Common Stock In Exchange For Debt IssuanceOfCommonStockInExchangeForDebt	0	USD
CY2020	crk	Issuance Of Common Stock In Exchange For Debt IssuanceOfCommonStockInExchangeForDebt	5012000	USD
	crk	Oil And Gas Properties Sold Oil And Gas Sales OilAndGasPropertiesSoldOilAndGasSales	17747000	USD
	crk	Oil And Gas Properties Sold Operating Expenses OilAndGasPropertiesSoldOperatingExpenses	6134000	USD
	crk	Oil And Gas Properties Sold Operating Income Loss OilAndGasPropertiesSoldOperatingIncomeLoss	11613000	USD
CY2018Q3	crk	Working Interests Reacquired Under Joint Venture WorkingInterestsReacquiredUnderJointVenture	17900000	USD
CY2018Q3	crk	Proceeds From Sale Of Undeveloped Acreage ProceedsFromSaleOfUndevelopedAcreage	13700000	USD
CY2019Q4	crk	Capitalized Costs Lease Hold Costs CapitalizedCostsLeaseHoldCosts	2912196000	USD
CY2020Q4	crk	Capitalized Costs Lease Hold Costs CapitalizedCostsLeaseHoldCosts	3010760000	USD
CY2019Q4	us-gaap	Capitalized Costs Wells And Related Equipment And Facilities CapitalizedCostsWellsAndRelatedEquipmentAndFacilities	1165317000	USD
CY2020Q4	us-gaap	Capitalized Costs Wells And Related Equipment And Facilities CapitalizedCostsWellsAndRelatedEquipmentAndFacilities	1636428000	USD
CY2019Q4	us-gaap	Capitalized Costs Accumulated Depreciation Depletion Amortization And Valuation Allowance For Relating To Oil And Gas Producing Activities CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities	485851000	USD
CY2020Q4	us-gaap	Capitalized Costs Accumulated Depreciation Depletion Amortization And Valuation Allowance For Relating To Oil And Gas Producing Activities CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities	901003000	USD
CY2019Q4	us-gaap	Capitalized Costs Proved Properties CapitalizedCostsProvedProperties	3591662000	USD
CY2020Q4	us-gaap	Capitalized Costs Proved Properties CapitalizedCostsProvedProperties	3746185000	USD
CY2019Q4	us-gaap	Capitalized Costs Unproved Properties CapitalizedCostsUnprovedProperties	410897000	USD
CY2020Q4	us-gaap	Capitalized Costs Unproved Properties CapitalizedCostsUnprovedProperties	332765000	USD
CY2019Q4	us-gaap	Capitalized Costs Oil And Gas Producing Activities Net CapitalizedCostsOilAndGasProducingActivitiesNet	4002559000	USD
CY2020Q4	us-gaap	Capitalized Costs Oil And Gas Producing Activities Net CapitalizedCostsOilAndGasProducingActivitiesNet	4078950000	USD
	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties CostsIncurredAcquisitionOfOilAndGasProperties	39323000	USD
	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties CostsIncurredAcquisitionOfOilAndGasProperties	21013000	USD
CY2019	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties CostsIncurredAcquisitionOfOilAndGasProperties	2097451000	USD
CY2020	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties CostsIncurredAcquisitionOfOilAndGasProperties	0	USD
	crk	Exploratory Leasehold Costs ExploratoryLeaseholdCosts	0	USD
	crk	Exploratory Leasehold Costs ExploratoryLeaseholdCosts	0	USD
CY2019	crk	Exploratory Leasehold Costs ExploratoryLeaseholdCosts	0	USD
CY2020	crk	Exploratory Leasehold Costs ExploratoryLeaseholdCosts	7949000	USD
	crk	Costs Incurred Development Leasehold Costs CostsIncurredDevelopmentLeaseholdCosts	2848000	USD
	crk	Costs Incurred Development Leasehold Costs CostsIncurredDevelopmentLeaseholdCosts	1715000	USD
CY2019	crk	Costs Incurred Development Leasehold Costs CostsIncurredDevelopmentLeaseholdCosts	7603000	USD
CY2020	crk	Costs Incurred Development Leasehold Costs CostsIncurredDevelopmentLeaseholdCosts	13022000	USD
	crk	Costs Incurred Development Drilling Costs CostsIncurredDevelopmentDrillingCosts	90840000	USD
	crk	Costs Incurred Development Drilling Costs CostsIncurredDevelopmentDrillingCosts	148745000	USD
CY2019	crk	Costs Incurred Development Drilling Costs CostsIncurredDevelopmentDrillingCosts	493625000	USD
CY2020	crk	Costs Incurred Development Drilling Costs CostsIncurredDevelopmentDrillingCosts	436074000	USD
	crk	Costs Incurred Other Development Costs CostsIncurredOtherDevelopmentCosts	13871000	USD
	crk	Costs Incurred Other Development Costs CostsIncurredOtherDevelopmentCosts	13612000	USD
CY2019	crk	Costs Incurred Other Development Costs CostsIncurredOtherDevelopmentCosts	9339000	USD
CY2020	crk	Costs Incurred Other Development Costs CostsIncurredOtherDevelopmentCosts	34525000	USD
	us-gaap	Costs Incurred Oil And Gas Property Acquisition Exploration And Development Activities CostsIncurredOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivities	146882000	USD
	us-gaap	Costs Incurred Oil And Gas Property Acquisition Exploration And Development Activities CostsIncurredOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivities	185085000	USD
CY2019	us-gaap	Costs Incurred Oil And Gas Property Acquisition Exploration And Development Activities CostsIncurredOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivities	2608018000	USD
CY2020	us-gaap	Costs Incurred Oil And Gas Property Acquisition Exploration And Development Activities CostsIncurredOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivities	491570000	USD
CY2019Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	25693000	USD
CY2020Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	34403000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	2500132000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	2517149000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	0	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	0	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	0	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	500000000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	619400000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	1650000000	USD
CY2020Q4	crk	Long Term Debt Principal Amount LongTermDebtPrincipalAmount	2769400000	USD
CY2020Q4	us-gaap	Contractual Obligation Due In Next Twelve Months ContractualObligationDueInNextTwelveMonths	21500000	USD
CY2020Q4	us-gaap	Contractual Obligation Due In Second Year ContractualObligationDueInSecondYear	31200000	USD
CY2020Q4	crk	Contractual Obligation To Be Paid After Year Two ContractualObligationToBePaidAfterYearTwo	24800000	USD
CY2020	crk	Contract Terms Related To Drilling Services Cancellable ContractTermsRelatedToDrillingServicesCancellable	P45D
CY2020Q4	crk	Commitments For Contracted Drilling Services CommitmentsForContractedDrillingServices	6000000.0	USD
CY2019Q3	crk	Temporary Equity Stock Conversion Price TemporaryEquityStockConversionPrice	4.00
CY2019Q3	crk	Temporary Equity Stock Conversion Price TemporaryEquityStockConversionPrice	4.00
CY2019Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	400000000	shares
CY2019Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.50
CY2019Q3	us-gaap	Temporary Equity Shares Authorized TemporaryEquitySharesAuthorized	5000000	shares
CY2018	crk	Stock And Warrants Exercised During Period Shares Preferred Stock And Warrants StockAndWarrantsExercisedDuringPeriodSharesPreferredStockAndWarrants	402708	shares
CY2018Q3	crk	Remaining Stock And Warrants Expired Without Being Exercised During Period Shares Warrants RemainingStockAndWarrantsExpiredWithoutBeingExercisedDuringPeriodSharesWarrants	11955	shares
CY2019Q3	crk	Common Stock And Preferred Stock Shares Authorized CommonStockAndPreferredStockSharesAuthorized	405000000	shares
CY2019Q3	us-gaap	Temporary Equity Par Or Stated Value Per Share TemporaryEquityParOrStatedValuePerShare	10.00
CY2020	crk	Performance Units Adjustment For Performance Multiplier Range Minimum PerformanceUnitsAdjustmentForPerformanceMultiplierRangeMinimum	0
CY2020	crk	Refund Of Unused Alternative Minimum Tax Credit Carryforwards RefundOfUnusedAlternativeMinimumTaxCreditCarryforwards	10200000	USD
CY2020	crk	Performance Units Adjustment For Performance Multiplier Range Maximum PerformanceUnitsAdjustmentForPerformanceMultiplierRangeMaximum	2
	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	508000	USD
	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	252000	USD
CY2019	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	1041000	USD
CY2020	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	1261000	USD
	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-1349000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	13000	USD
	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	82000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	-223000	USD
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	-154000	USD
	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	2412000	USD
	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	16406000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	27550000	USD
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-12037000	USD
	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-1360000	USD
	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	3805000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	476000	USD
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	2981000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1065000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	18944000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	27803000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-9210000	USD
CY2018	crk	Operating Losses Carryforward Indefinitely With No Carryback As Percentage Of Taxable Income OperatingLossesCarryforwardIndefinitelyWithNoCarrybackAsPercentageOfTaxableIncome	0.80
CY2018	crk	Interest Expense Threshold Percentage Of Adjusted Taxable Income Beyond Which Interest Expense Is Deductible InterestExpenseThresholdPercentageOfAdjustedTaxableIncomeBeyondWhichInterestExpenseIsDeductible	0.30
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Asset Retirement Obligations DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations	3812000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Asset Retirement Obligations DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations	4061000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	51656000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	59335000	USD
CY2019Q4	crk	Deferred Tax Assets Interest Expense Limitation DeferredTaxAssetsInterestExpenseLimitation	62552000	USD
CY2020Q4	crk	Deferred Tax Assets Interest Expense Limitation DeferredTaxAssetsInterestExpenseLimitation	55026000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Derivative Instruments DeferredTaxAssetsDerivativeInstruments	0	USD
CY2020Q4	us-gaap	Deferred Tax Assets Derivative Instruments DeferredTaxAssetsDerivativeInstruments	10452000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	9022000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	5661000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	127042000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	134535000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	16876000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	15964000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	110166000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	321938000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	118571000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	269587000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	283959000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	10763000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	0	USD
CY2019Q4	crk	Deferred Tax Liabilities Amortization Of Bond Discount DeferredTaxLiabilitiesAmortizationOfBondDiscount	37458000	USD
CY2020Q4	crk	Deferred Tax Liabilities Amortization Of Bond Discount DeferredTaxLiabilitiesAmortizationOfBondDiscount	30591000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	4130000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	4604000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	319154000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	211772000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	200583000	USD
	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-19255000	USD
	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	17444000	USD
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	26185000	USD
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-12941000	USD
	crk	Income Tax Reconciliation Alternative Minimum Tax Credit Refundable IncomeTaxReconciliationAlternativeMinimumTaxCreditRefundable	0	USD
	crk	Income Tax Reconciliation Alternative Minimum Tax Credit Refundable IncomeTaxReconciliationAlternativeMinimumTaxCreditRefundable	1349000	USD
CY2019	crk	Income Tax Reconciliation Alternative Minimum Tax Credit Refundable IncomeTaxReconciliationAlternativeMinimumTaxCreditRefundable	0	USD
CY2020	crk	Income Tax Reconciliation Alternative Minimum Tax Credit Refundable IncomeTaxReconciliationAlternativeMinimumTaxCreditRefundable	0	USD
	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	22053000	USD
	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-903000	USD
CY2019	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-494000	USD
CY2020	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-919000	USD
	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-3599000	USD
	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	3863000	USD
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-499000	USD
CY2020	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	3746000	USD
	crk	Income Tax Reconciliation Nondeductible Expense Transaction Costs IncomeTaxReconciliationNondeductibleExpenseTransactionCosts	0	USD
	crk	Income Tax Reconciliation Nondeductible Expense Transaction Costs IncomeTaxReconciliationNondeductibleExpenseTransactionCosts	0	USD
CY2019	crk	Income Tax Reconciliation Nondeductible Expense Transaction Costs IncomeTaxReconciliationNondeductibleExpenseTransactionCosts	1417000	USD
CY2020	crk	Income Tax Reconciliation Nondeductible Expense Transaction Costs IncomeTaxReconciliationNondeductibleExpenseTransactionCosts	0	USD
	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-120000	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	886000	USD
	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	668000	USD
CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	1109000	USD
	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	1198000	USD
	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	9000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	308000	USD
CY2020	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-205000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1065000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	18944000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	27803000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-9210000	USD
	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.004
	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0.015
	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.039
CY2020	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
	crk	Effective Income Tax Rate Reconciliation Alternative Minimum Tax Credit Refundable EffectiveIncomeTaxRateReconciliationAlternativeMinimumTaxCreditRefundable	0
	crk	Effective Income Tax Rate Reconciliation Alternative Minimum Tax Credit Refundable EffectiveIncomeTaxRateReconciliationAlternativeMinimumTaxCreditRefundable	-0.016
CY2019	crk	Effective Income Tax Rate Reconciliation Alternative Minimum Tax Credit Refundable EffectiveIncomeTaxRateReconciliationAlternativeMinimumTaxCreditRefundable	0
CY2020	crk	Effective Income Tax Rate Reconciliation Alternative Minimum Tax Credit Refundable EffectiveIncomeTaxRateReconciliationAlternativeMinimumTaxCreditRefundable	0
	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.241
	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.011
	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.047
CY2019	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	-0.004
CY2020	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	-0.061
	crk	Effective Income Tax Rate Reconciliation Nondeductible Expense Transaction Costs EffectiveIncomeTaxRateReconciliationNondeductibleExpenseTransactionCosts	0
	crk	Effective Income Tax Rate Reconciliation Nondeductible Expense Transaction Costs EffectiveIncomeTaxRateReconciliationNondeductibleExpenseTransactionCosts	0
CY2019	crk	Effective Income Tax Rate Reconciliation Nondeductible Expense Transaction Costs EffectiveIncomeTaxRateReconciliationNondeductibleExpenseTransactionCosts	0.011
CY2020	crk	Effective Income Tax Rate Reconciliation Nondeductible Expense Transaction Costs EffectiveIncomeTaxRateReconciliationNondeductibleExpenseTransactionCosts	0
	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	-0.007
	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	-0.001
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.007
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	-0.018
	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.013
	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.003
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.003
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.012
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.229
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.223
CY2020	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.149
CY2020	crk	Net Operating Loss Limitation NetOperatingLossLimitation	3300000	USD
CY2020	crk	Period Of Increase In Net Operating Loss Limitation PeriodOfIncreaseInNetOperatingLossLimitation	P5Y
CY2020	crk	Net Operating Loss Expiration Period NetOperatingLossExpirationPeriod	P20Y
CY2019Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Cash Inflows FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows	13078155000	USD
CY2020Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Cash Inflows FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows	9871616000	USD
CY2018Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Cash Inflows FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows	8054092000	USD
CY2018Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Production Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts	2160912000	USD
CY2019Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Production Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts	3562042000	USD
CY2020Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Production Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts	3173350000	USD
CY2018Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Development Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts	1800335000	USD
CY2019Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Development Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts	3171351000	USD
CY2019	srt	Increase Decrease In Estimated Future Development Costs IncreaseDecreaseInEstimatedFutureDevelopmentCosts	-93476000	USD
CY2020	srt	Increase Decrease In Estimated Future Development Costs IncreaseDecreaseInEstimatedFutureDevelopmentCosts	313191000	USD
CY2020Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Development Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts	2592520000	USD
CY2018Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Income Tax Expense FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense	622241000	USD
CY2019Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Income Tax Expense FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense	676759000	USD
CY2020Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Income Tax Expense FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense	154872000	USD
CY2018Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Net Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows	3470604000	USD
CY2019Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Net Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows	5668003000	USD
CY2020Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Net Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows	3950874000	USD
	crk	Percentage Of Discount Factor PercentageOfDiscountFactor	0.10
CY2019	crk	Percentage Of Discount Factor PercentageOfDiscountFactor	0.10
CY2020	crk	Percentage Of Discount Factor PercentageOfDiscountFactor	0.10
	crk	Percentage Of Discount Factor PercentageOfDiscountFactor	0.10
CY2018Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Ten Percent Annual Discount For Estimated Timing Of Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows	1996764000	USD
CY2019Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Ten Percent Annual Discount For Estimated Timing Of Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows	2754792000	USD
CY2020Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Ten Percent Annual Discount For Estimated Timing Of Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows	2015149000	USD
CY2018Q4	srt	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	1473840000	USD
CY2019Q4	srt	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	2913211000	USD
CY2020Q4	srt	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	1935725000	USD
CY2018Q3	srt	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	1317383000	USD
CY2018Q4	srt	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	1473840000	USD
CY2019Q4	srt	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	2913211000	USD
	srt	Net Increase Decrease In Sales And Transfer Prices And Production Costs NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts	223731000	USD
CY2019	srt	Net Increase Decrease In Sales And Transfer Prices And Production Costs NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts	-716930000	USD
CY2020	srt	Net Increase Decrease In Sales And Transfer Prices And Production Costs NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts	-1858026000	USD
	srt	Previously Estimated Development Costs Incurred PreviouslyEstimatedDevelopmentCostsIncurred	112073000	USD
CY2019	srt	Previously Estimated Development Costs Incurred PreviouslyEstimatedDevelopmentCostsIncurred	311331000	USD
CY2020	srt	Previously Estimated Development Costs Incurred PreviouslyEstimatedDevelopmentCostsIncurred	302135000	USD
	srt	Revisions Of Previous Quantity Estimates RevisionsOfPreviousQuantityEstimates	27090000	USD
CY2019	srt	Revisions Of Previous Quantity Estimates RevisionsOfPreviousQuantityEstimates	16340000	USD
CY2020	srt	Revisions Of Previous Quantity Estimates RevisionsOfPreviousQuantityEstimates	215268000	USD
	srt	Standardized Measure Of Discounted Future Net Cash Flow Relating To Proved Oil And Gas Reserves Accretion Of Discount StandardizedMeasureOfDiscountedFutureNetCashFlowRelatingToProvedOilAndGasReservesAccretionOfDiscount	55692000	USD
CY2019	srt	Standardized Measure Of Discounted Future Net Cash Flow Relating To Proved Oil And Gas Reserves Accretion Of Discount StandardizedMeasureOfDiscountedFutureNetCashFlowRelatingToProvedOilAndGasReservesAccretionOfDiscount	175514000	USD
CY2020	srt	Standardized Measure Of Discounted Future Net Cash Flow Relating To Proved Oil And Gas Reserves Accretion Of Discount StandardizedMeasureOfDiscountedFutureNetCashFlowRelatingToProvedOilAndGasReservesAccretionOfDiscount	326074000	USD
	srt	Increase Decrease In Estimated Future Development Costs IncreaseDecreaseInEstimatedFutureDevelopmentCosts	23139000	USD
	crk	Changes In Timing ChangesInTiming	9434000	USD
CY2019	crk	Changes In Timing ChangesInTiming	180314000	USD
CY2020	crk	Changes In Timing ChangesInTiming	-127663000	USD
	srt	Extensions Discoveries Additions And Improved Recovery Less Related Costs ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts	15263000	USD
CY2019	srt	Extensions Discoveries Additions And Improved Recovery Less Related Costs ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts	442099000	USD
CY2020	srt	Extensions Discoveries Additions And Improved Recovery Less Related Costs ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts	180624000	USD
	srt	Increase Due To Purchases Of Minerals In Place IncreaseDueToPurchasesOfMineralsInPlace	54143000	USD
CY2019	srt	Increase Due To Purchases Of Minerals In Place IncreaseDueToPurchasesOfMineralsInPlace	1813491000	USD
CY2020	srt	Increase Due To Purchases Of Minerals In Place IncreaseDueToPurchasesOfMineralsInPlace	0	USD
	srt	Decrease Due To Sales Of Minerals In Place DecreaseDueToSalesOfMineralsInPlace	42870000	USD
CY2019	srt	Decrease Due To Sales Of Minerals In Place DecreaseDueToSalesOfMineralsInPlace	51070000	USD
CY2020	srt	Decrease Due To Sales Of Minerals In Place DecreaseDueToSalesOfMineralsInPlace	0	USD
	srt	Sales And Transfers Of Oil And Gas Produced Net Of Production Costs SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts	181218000	USD
CY2019	srt	Sales And Transfers Of Oil And Gas Produced Net Of Production Costs SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts	580922000	USD
CY2020	srt	Sales And Transfers Of Oil And Gas Produced Net Of Production Costs SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts	612194000	USD
	srt	Increase Decrease In Future Income Tax Expense Estimates On Future Cash Flows Related To Proved Oil And Gas Reserves IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves	-140020000	USD
CY2019	srt	Increase Decrease In Future Income Tax Expense Estimates On Future Cash Flows Related To Proved Oil And Gas Reserves IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves	-57320000	USD
CY2020	srt	Increase Decrease In Future Income Tax Expense Estimates On Future Cash Flows Related To Proved Oil And Gas Reserves IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves	283105000	USD
CY2018Q4	srt	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	1473840000	USD
CY2019Q4	srt	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	2913211000	USD
CY2020Q4	srt	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	1935725000	USD

Files In Submission

Name	View Source	Status
0000023194-21-000015-index-headers.html	Edgar Link	pending
0000023194-21-000015-index.html	Edgar Link	pending
0000023194-21-000015.txt	Edgar Link	pending
0000023194-21-000015-xbrl.zip	Edgar Link	pending
crk-20201231.htm	Edgar Link	pending
crk-20201231.xsd	Edgar Link	pending
crk-20201231x10kexx311.htm	Edgar Link	pending
crk-20201231x10kexx312.htm	Edgar Link	pending
crk-20201231x10kexx321.htm	Edgar Link	pending
crk-20201231x10kexx322.htm	Edgar Link	pending
crk-20201231_cal.xml	Edgar Link	unprocessable
crk-20201231_def.xml	Edgar Link	unprocessable
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crk-20201231_htm.xml	Edgar Link	completed
crk-20201231_lab.xml	Edgar Link	unprocessable
crk-20201231_pre.xml	Edgar Link	unprocessable
exhibit1020.htm	Edgar Link	pending
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FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
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2019 Q4 Form 10-K Financial Statement

#000002319421000015 Filed on February 17, 2021

Income Statement

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$CRK COMSTOCK RESOURCES INC Stock $crk

2019 Q4 Form 10-K Financial Statement

#000002319421000015 Filed on February 17, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

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COMSTOCK RESOURCES INC Stock $crk