$MGY
Magnolia Oil & Gas Corp Stock $mgy

$mgy Overview Financials Valuation SEC Filings Company Website

2020 Q4 Form 10-K Financial Statement

#000169899021000003 Filed on February 23, 2021

Income Statement

Concept	2020 Q4	2020	2019 Q4
Revenue	$149.2M	$541.3M	$229.7M
YoY Change	-35.05%	-42.55%	-9.82%
Cost Of Revenue	$26.00M	$107.8M	$31.90M
YoY Change	-18.5%	-16.24%	12.32%
Gross Profit	$123.3M	$426.7M	$197.8M
YoY Change	-37.66%	-47.15%	-12.56%
Gross Profit Margin	82.64%	78.83%	86.11%
Selling, General & Admin	$26.80M	$100.2M	$29.70M
YoY Change	-9.76%	-18.67%	-8.05%
% of Gross Profit	21.74%	23.48%	15.02%
Research & Development	$3.700M	$567.3M	$2.700M
YoY Change	37.04%	4366.93%	285.71%
% of Gross Profit	3.0%	132.95%	1.37%
Depreciation & Amortization	$48.70M	$283.4M	$141.3M
YoY Change	-65.53%	-45.88%	21.29%
% of Gross Profit	39.5%	66.41%	71.44%
Operating Expenses	$80.60M	$971.1M	$175.1M
YoY Change	-53.97%	42.91%	16.11%
Operating Profit	$42.70M	-$1.926B	$22.70M
YoY Change	88.11%	-1610.3%	-69.89%
Interest Expense	-$4.500M	-$26.00M	-$6.500M
YoY Change	-30.77%	-5.45%	-7.14%
% of Operating Profit	-10.54%		-28.63%
Other Income/Expense, Net	$3.900M	-$22.66M	-$200.0K
YoY Change	-2050.0%	-18.31%	-85.71%
Pretax Income	$42.00M	-$1.948B	$15.90M
YoY Change	164.15%	-2052.91%	-75.5%
Income Tax	$0.00	-$79.34M	$2.300M
% Of Pretax Income	0.0%		14.47%
Net Earnings	$27.70M	-$1.208B	$8.100M
YoY Change	241.98%	-2507.34%	-75.0%
Net Earnings / Revenue	18.57%	-223.24%	3.53%
Basic Earnings Per Share
Diluted Earnings Per Share	$168.0K	-$7.266M	$44.09K
COMMON SHARES
Basic Shares Outstanding		166.3M shares
Diluted Shares Outstanding		166.3M shares

Balance Sheet

Concept	2020 Q4	2020	2019 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$192.6M	$192.6M	$182.6M
YoY Change	5.48%	5.48%	34.46%
Cash & Equivalents	$192.6M	$192.6M	$182.6M
Short-Term Investments
Other Short-Term Assets	$3.601M	$7.400M	$4.511M
YoY Change	-20.17%	54.17%	11.16%
Inventory
Prepaid Expenses
Receivables	$81.56M	$81.60M	$105.8M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$281.5M	$281.5M	$293.2M
YoY Change	-3.99%	-3.99%	0.29%
LONG-TERM ASSETS
Property, Plant & Equipment	$1.150B	$1.150B	$3.117B
YoY Change	-63.12%	-63.12%	1.42%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$0.00	$0.00	$19.73M
YoY Change	-100.0%	-100.0%	4.54%
Other Assets	$6.979M	$13.00M	$4.460M
YoY Change	56.48%	0.78%
Total Long-Term Assets	$1.172B	$1.172B	$3.173B
YoY Change	-63.07%	-63.07%	1.02%
TOTAL ASSETS
Total Short-Term Assets	$281.5M	$281.5M	$293.2M
Total Long-Term Assets	$1.172B	$1.172B	$3.173B
Total Assets	$1.453B	$1.453B	$3.466B
YoY Change	-58.07%	-58.07%	0.96%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$62.63M	$62.60M	$79.43M
YoY Change	-21.15%	-21.16%	4.1%
Accrued Expenses	$37.60M	$37.60M
YoY Change
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	$128.9M	$128.9M	$175.2M
YoY Change	-26.4%	-26.43%	-11.22%
LONG-TERM LIABILITIES
Long-Term Debt	$391.1M	$391.1M	$389.8M
YoY Change	0.33%	0.33%	0.31%
Other Long-Term Liabilities	$5.702M	$93.90M	$1.476M
YoY Change	286.31%	-1.16%
Total Long-Term Liabilities	$485.0M	$485.0M	$562.7M
YoY Change	-13.79%	0.04%	6.52%
TOTAL LIABILITIES
Total Short-Term Liabilities	$128.9M	$128.9M	$175.2M
Total Long-Term Liabilities	$485.0M	$485.0M	$562.7M
Total Liabilities	$614.0M	$905.3M	$737.9M
YoY Change	-16.79%	-46.44%	1.7%
SHAREHOLDERS EQUITY
Retained Earnings	-$1.125B		$82.94M
YoY Change	-1456.94%		133.59%
Common Stock
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$548.2M	$548.2M	$1.776B
YoY Change
Total Liabilities & Shareholders Equity	$1.453B	$1.453B	$3.466B
YoY Change	-58.07%	-58.07%	0.96%

Cashflow Statement

Concept	2020 Q4	2020	2019 Q4
OPERATING ACTIVITIES
Net Income	$27.70M	-$1.208B	$8.100M
YoY Change	241.98%	-2507.34%	-75.0%
Depreciation, Depletion And Amortization	$48.70M	$283.4M	$141.3M
YoY Change	-65.53%	-45.88%	21.29%
Cash From Operating Activities	$79.10M	$310.1M	$159.0M
YoY Change	-50.25%	-52.11%	-25.98%
INVESTING ACTIVITIES
Capital Expenditures	-$40.60M	-$197.9M	-$70.10M
YoY Change	-42.08%	-54.51%	-32.92%
Acquisitions		$0.00
YoY Change		-100.0%
Other Investing Activities	$21.40M	$1.148M	$0.00
YoY Change		374.38%	-100.0%
Cash From Investing Activities	-$19.20M	-$270.0M	-$70.10M
YoY Change	-72.61%	-48.5%	-39.46%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net		$0.00
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-15.90M	-$30.21M	-70.70M
YoY Change	-77.51%	-60.51%
NET CHANGE
Cash From Operating Activities	79.10M	$310.1M	159.0M
Cash From Investing Activities	-19.20M	-$270.0M	-70.10M
Cash From Financing Activities	-15.90M	-$30.21M	-70.70M
Net Change In Cash	44.00M	$9.928M	18.20M
YoY Change	141.76%	-78.82%	-81.62%
FREE CASH FLOW
Cash From Operating Activities	$79.10M	$310.1M	$159.0M
Capital Expenditures	-$40.60M	-$197.9M	-$70.10M
Free Cash Flow	$119.7M	$508.0M	$229.1M
YoY Change	-47.75%	-53.07%	-28.25%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2020	dei	City Area Code CityAreaCode	713
CY2020	dei	Local Phone Number LocalPhoneNumber	842-9050
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	81-5365682
CY2020	dei	Entity Address Address Line1 EntityAddressAddressLine1	Nine Greenway Plaza, Suite 1300
CY2020	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	77046
CY2020	dei	Entity Address City Or Town EntityAddressCityOrTown	Houston,
CY2020	dei	Entity Address State Or Province EntityAddressStateOrProvince	TX
CY2020	dei	Entity Central Index Key EntityCentralIndexKey	0001698990
CY2020	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
CY2020	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2020	dei	Amendment Flag AmendmentFlag	false
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	us-gaap:OtherAssets
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	us-gaap:OtherAssets
CY2019Q4	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	us-gaap:OtherLiabilitiesCurrent
CY2020Q4	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	us-gaap:OtherLiabilitiesCurrent
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent Statement Of Financial Position Extensible List OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	us-gaap:OtherLiabilitiesNoncurrent
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent Statement Of Financial Position Extensible List OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	us-gaap:OtherLiabilitiesNoncurrent
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	001-38083
CY2020	dei	Entity Registrant Name EntityRegistrantName	Magnolia Oil & Gas Corp
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2020	dei	Security12b Title Security12bTitle	Class A Common Stock, par value $0.0001
CY2020	dei	Trading Symbol TradingSymbol	MGY
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	Large Accelerated Filer
CY2020	dei	Entity Small Business EntitySmallBusiness	false
CY2020	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2020	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2020	dei	Entity Shell Company EntityShellCompany	false
CY2020Q2	dei	Entity Public Float EntityPublicFloat	700000000	USD
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CY2019Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	105775000	USD
CY2020Q4	mgy	Drilling Advances DrillingAdvances	3805000	USD
CY2019Q4	mgy	Drilling Advances DrillingAdvances	299000	USD
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	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	220338000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-79340000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	14760000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	11455000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1785000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	-1868983000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	85005000	USD
	us-gaap	Profit Loss ProfitLoss	82448000	USD
	us-gaap	Profit Loss ProfitLoss	218553000	USD
CY2020	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-660593000	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	34809000	USD
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	43353000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	-1208390000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	50196000	USD
	us-gaap	Net Income Loss NetIncomeLoss	39095000	USD
CY2020	mgy	Classof Warrantor Right Noncash Deemed Dividend ClassofWarrantorRightNoncashDeemedDividend	0	USD
CY2019	mgy	Classof Warrantor Right Noncash Deemed Dividend ClassofWarrantorRightNoncashDeemedDividend	2763000	USD
	mgy	Classof Warrantor Right Noncash Deemed Dividend ClassofWarrantorRightNoncashDeemedDividend	0	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-1208390000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	47433000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	39095000	USD
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	166270000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	161886000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	154527000	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	166270000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	167047000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	158232000	shares
CY2017Q4	mgy	Net Parent Investment NetParentInvestment	1597838000	USD
	mgy	Net Parent Investment Increasefrom Contribution NetParentInvestmentIncreasefromContribution	62641000	USD
	us-gaap	Profit Loss ProfitLoss	218553000	USD
CY2018Q3	mgy	Net Parent Investment NetParentInvestment	1879032000	USD
CY2018Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4784000	USD
CY2018Q3	mgy	Stock Issued During Period Value Releasedfrom Possible Redemption StockIssuedDuringPeriodValueReleasedfromPossibleRedemption	619479000	USD
CY2018Q3	us-gaap	Stock Redeemed Or Called During Period Value StockRedeemedOrCalledDuringPeriodValue	9000	USD
CY2018Q3	us-gaap	Stock Issued During Period Value Conversion Of Convertible Securities StockIssuedDuringPeriodValueConversionOfConvertibleSecurities	0	USD
CY2018Q3	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	1423484000	USD
CY2018Q3	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	355000000	USD
CY2018Q3	mgy	Adjustments To Additional Paid In Capital Earnout Consideration Issued As Part Of Business Combination AdjustmentsToAdditionalPaidInCapitalEarnoutConsiderationIssuedAsPartOfBusinessCombination	149700000	USD
CY2018Q3	mgy	Adjustments To Additional Paid In Capital Noncompete Consideration AdjustmentsToAdditionalPaidInCapitalNoncompeteConsideration	44400000	USD
CY2018Q3	us-gaap	Minority Interest Period Increase Decrease MinorityInterestPeriodIncreaseDecrease	0	USD
CY2018Q3	mgy	Adjustments To Additional Paid In Capital Changes In Deferred Tax Liability AdjustmentsToAdditionalPaidInCapitalChangesInDeferredTaxLiability	-52787000	USD
CY2018Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2544051000	USD
	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	58212000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1851000	USD
	us-gaap	Profit Loss ProfitLoss	82448000	USD
	us-gaap	Minority Interest Period Increase Decrease MinorityInterestPeriodIncreaseDecrease	0	USD
	mgy	Adjustments To Additional Paid In Capital Changes In Deferred Tax Liability AdjustmentsToAdditionalPaidInCapitalChangesInDeferredTaxLiability	21393000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2707955000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2707955000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	11089000	USD
CY2019	us-gaap	Minority Interest Period Increase Decrease MinorityInterestPeriodIncreaseDecrease	-8980000	USD
CY2019	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	33693000	USD
CY2019	mgy	Shares Redeemed During Period Business Acquisition Value SharesRedeemedDuringPeriodBusinessAcquisitionValue	25245000	USD
CY2019	mgy	Stock Issued During Period Value Warrants Exchange StockIssuedDuringPeriodValueWarrantsExchange	-2232000	USD
CY2019	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	771000	USD
CY2019	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	10277000	USD
CY2019	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	69093000	USD
CY2019	us-gaap	Noncontrolling Interest Increase From Subsidiary Equity Issuance NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance	8809000	USD
CY2019	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	1424000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	85005000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2728529000	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	10029000	USD
CY2020	us-gaap	Minority Interest Period Increase Decrease MinorityInterestPeriodIncreaseDecrease	0	USD
CY2020	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	792000	USD
CY2020	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	28681000	USD
CY2020	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	680000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	-1868983000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	839422000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	-1868983000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	85005000	USD
	us-gaap	Profit Loss ProfitLoss	82448000	USD
	us-gaap	Profit Loss ProfitLoss	218553000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	283353000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	523572000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	177890000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	137871000	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	14505000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	14505000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	6044000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	0	USD
CY2020	mgy	Noncash Exploration Expense NoncashExplorationExpense	563999000	USD
CY2019	mgy	Noncash Exploration Expense NoncashExplorationExpense	1154000	USD
	mgy	Noncash Exploration Expense NoncashExplorationExpense	567000	USD
	mgy	Noncash Exploration Expense NoncashExplorationExpense	0	USD
CY2020	mgy	Impairment Of Proved Oil And Gas Properties ImpairmentOfProvedOilAndGasProperties	1381258000	USD
CY2019	mgy	Impairment Of Proved Oil And Gas Properties ImpairmentOfProvedOilAndGasProperties	0	USD
	mgy	Impairment Of Proved Oil And Gas Properties ImpairmentOfProvedOilAndGasProperties	0	USD
	mgy	Impairment Of Proved Oil And Gas Properties ImpairmentOfProvedOilAndGasProperties	0	USD
CY2020	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	5718000	USD
CY2019	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	5512000	USD
	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	1668000	USD
	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	104000	USD
CY2020	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	3628000	USD
CY2019	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	3541000	USD
	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	1461000	USD
	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	0	USD
CY2020	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	277000	USD
CY2019	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	0	USD
	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	0	USD
	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	9490000	USD
CY2020	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	5071000	USD
CY2019	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	0	USD
	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	0	USD
	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	0	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-77834000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	14261000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	12128000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	324000	USD
CY2020	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	0	USD
CY2019	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	0	USD
	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	6700000	USD
	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	0	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	10029000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	11089000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	1851000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	0	USD
CY2020	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	728000	USD
CY2019	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	668000	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	773000	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	796000	USD
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-24216000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-7952000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	50610000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	61405000	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-16961000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-6834000	USD
	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	25041000	USD
	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-4522000	USD
CY2020	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-2457000	USD
CY2019	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-19181000	USD
	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	53973000	USD
	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	4558000	USD
CY2020	mgy	Increase Decreasein Drilling Advances IncreaseDecreaseinDrillingAdvances	3506000	USD
CY2019	mgy	Increase Decreasein Drilling Advances IncreaseDecreaseinDrillingAdvances	-11960000	USD
	mgy	Increase Decreasein Drilling Advances IncreaseDecreaseinDrillingAdvances	9559000	USD
	mgy	Increase Decreasein Drilling Advances IncreaseDecreaseinDrillingAdvances	0	USD
CY2020	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	768000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	4249000	USD
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	3359000	USD
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	385000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	310121000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	647619000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	305470000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	284812000	USD
CY2020	mgy	Proceedsfrom Withdrawal From Trust Account ProceedsfromWithdrawalFromTrustAccount	0	USD
CY2019	mgy	Proceedsfrom Withdrawal From Trust Account ProceedsfromWithdrawalFromTrustAccount	0	USD
	mgy	Proceedsfrom Withdrawal From Trust Account ProceedsfromWithdrawalFromTrustAccount	656078000	USD
	mgy	Proceedsfrom Withdrawal From Trust Account ProceedsfromWithdrawalFromTrustAccount	0	USD
CY2020	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	-4250000	USD
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	1219217000	USD
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2020	us-gaap	Payments To Acquire Business Two Net Of Cash Acquired PaymentsToAcquireBusinessTwoNetOfCashAcquired	73702000	USD
CY2019	us-gaap	Payments To Acquire Business Two Net Of Cash Acquired PaymentsToAcquireBusinessTwoNetOfCashAcquired	93221000	USD
	us-gaap	Payments To Acquire Business Two Net Of Cash Acquired PaymentsToAcquireBusinessTwoNetOfCashAcquired	146532000	USD
	us-gaap	Payments To Acquire Business Two Net Of Cash Acquired PaymentsToAcquireBusinessTwoNetOfCashAcquired	150139000	USD
CY2020	us-gaap	Proceeds From Sale Of Equity Method Investments ProceedsFromSaleOfEquityMethodInvestments	27074000	USD
CY2019	us-gaap	Proceeds From Sale Of Equity Method Investments ProceedsFromSaleOfEquityMethodInvestments	0	USD
	us-gaap	Proceeds From Sale Of Equity Method Investments ProceedsFromSaleOfEquityMethodInvestments	0	USD
	us-gaap	Proceeds From Sale Of Equity Method Investments ProceedsFromSaleOfEquityMethodInvestments	0	USD
CY2020	us-gaap	Payments To Acquire Oil And Gas Property And Equipment PaymentsToAcquireOilAndGasPropertyAndEquipment	197858000	USD
CY2019	us-gaap	Payments To Acquire Oil And Gas Property And Equipment PaymentsToAcquireOilAndGasPropertyAndEquipment	425124000	USD
	us-gaap	Payments To Acquire Oil And Gas Property And Equipment PaymentsToAcquireOilAndGasPropertyAndEquipment	192252000	USD
	us-gaap	Payments To Acquire Oil And Gas Property And Equipment PaymentsToAcquireOilAndGasPropertyAndEquipment	182068000	USD
CY2020	mgy	Payments To Acquire Oil And Gas Property And Equipment Changes In Working Capital PaymentsToAcquireOilAndGasPropertyAndEquipmentChangesInWorkingCapital	24354000	USD
CY2019	mgy	Payments To Acquire Oil And Gas Property And Equipment Changes In Working Capital PaymentsToAcquireOilAndGasPropertyAndEquipmentChangesInWorkingCapital	9911000	USD
	mgy	Payments To Acquire Oil And Gas Property And Equipment Changes In Working Capital PaymentsToAcquireOilAndGasPropertyAndEquipmentChangesInWorkingCapital	-50633000	USD
	mgy	Payments To Acquire Oil And Gas Property And Equipment Changes In Working Capital PaymentsToAcquireOilAndGasPropertyAndEquipmentChangesInWorkingCapital	15246000	USD
CY2020	us-gaap	Payment For Contingent Consideration Liability Investing Activities PaymentForContingentConsiderationLiabilityInvestingActivities	0	USD
CY2019	us-gaap	Payment For Contingent Consideration Liability Investing Activities PaymentForContingentConsiderationLiabilityInvestingActivities	0	USD
	us-gaap	Payment For Contingent Consideration Liability Investing Activities PaymentForContingentConsiderationLiabilityInvestingActivities	26000000	USD
	us-gaap	Payment For Contingent Consideration Liability Investing Activities PaymentForContingentConsiderationLiabilityInvestingActivities	0	USD
CY2020	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	1148000	USD
CY2019	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	242000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	350000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	0	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-269988000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-524248000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-877640000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-347453000	USD
CY2020	us-gaap	Proceeds From Contributions From Parent ProceedsFromContributionsFromParent	0	USD
CY2019	us-gaap	Proceeds From Contributions From Parent ProceedsFromContributionsFromParent	0	USD
	us-gaap	Proceeds From Contributions From Parent ProceedsFromContributionsFromParent	0	USD
	us-gaap	Proceeds From Contributions From Parent ProceedsFromContributionsFromParent	62641000	USD
CY2020	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	0	USD
CY2019	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	7301000	USD
	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	0	USD
	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	0	USD
CY2020	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	680000	USD
CY2019	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	1424000	USD
	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	0	USD
	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	0	USD
CY2020	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	355000000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2020	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
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	400000000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2020	mgy	Repayments Of Deferred Stock Issuance Costs RepaymentsOfDeferredStockIssuanceCosts	0	USD
CY2019	mgy	Repayments Of Deferred Stock Issuance Costs RepaymentsOfDeferredStockIssuanceCosts	0	USD
	mgy	Repayments Of Deferred Stock Issuance Costs RepaymentsOfDeferredStockIssuanceCosts	22750000	USD
	mgy	Repayments Of Deferred Stock Issuance Costs RepaymentsOfDeferredStockIssuanceCosts	0	USD
CY2020	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
CY2019	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	23336000	USD
	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
CY2020	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-844000	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-3003000	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-1009000	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	0	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-30205000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-76496000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	707905000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	62641000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	9928000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	46875000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	135735000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	0	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	182633000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	135758000	USD
CY2018Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	23000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	0	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	192561000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	182633000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	135758000	USD
CY2018Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	0	USD
CY2020	us-gaap	Use Of Estimates UseOfEstimates	<div style="text-align:justify;text-indent:36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%">Use of Estimates </span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify;text-indent:36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The preparation of financial statements in conformity with GAAP requires the Company’s management to make estimates and assumptions that affect the reported amounts of assets and liabilities, 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 results could differ from those estimates, and changes in these estimates are recorded when known. Significant estimates with regard to these financial statements include the fair value determination of acquired assets and liabilities, the assessment of asset retirement obligations, the estimate of proved oil and natural gas reserves and related present value estimates of future net cash flows, and the estimates of fair value for long-lived assets.</span></div>
CY2020Q4	us-gaap	Cash Equivalents At Carrying Value CashEquivalentsAtCarryingValue	192600000	USD
CY2019Q4	us-gaap	Cash Equivalents At Carrying Value CashEquivalentsAtCarryingValue	182600000	USD
CY2020	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	0	USD
CY2018Q3	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	0	USD
CY2020	mgy	Revenue From Contract With Customers General Required Payment Period RevenueFromContractWithCustomersGeneralRequiredPaymentPeriod	P30D
CY2020Q4	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	72000000.0	USD
CY2019Q4	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	100400000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	0	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	0	USD
	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	0	USD
CY2020	us-gaap	Gain Loss On Sale Of Derivatives GainLossOnSaleOfDerivatives	288000	USD
CY2019	us-gaap	Gain Loss On Sale Of Derivatives GainLossOnSaleOfDerivatives	0	USD
	us-gaap	Gain Loss On Sale Of Derivatives GainLossOnSaleOfDerivatives	0	USD
	us-gaap	Gain Loss On Sale Of Derivatives GainLossOnSaleOfDerivatives	-27617000	USD
CY2020	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	277000	USD
CY2019	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	0	USD
	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	0	USD
	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	9490000	USD
CY2020	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	565000	USD
CY2019	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	0	USD
	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-18127000	USD
CY2020Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	0	USD
CY2020Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	0	USD
CY2019Q4	us-gaap	Derivative Number Of Instruments Held DerivativeNumberOfInstrumentsHeld	0	derivative
CY2020Q1	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	1900000000	USD
CY2020Q1	mgy	Impairment Of Proved Oil And Gas Properties ImpairmentOfProvedOilAndGasProperties	1400000000	USD
CY2020Q1	mgy	Impairment Of Unproved Oil And Gas Properties ImpairmentOfUnprovedOilAndGasProperties	600000000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	35054000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	20549000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	9346000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	23851000	USD
CY2020	us-gaap	Acquired Finite Lived Intangible Assets Weighted Average Useful Life AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife	P3Y3M
CY2019	us-gaap	Acquired Finite Lived Intangible Assets Weighted Average Useful Life AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife	P3Y3M
CY2019	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	3104000	USD
	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	166000	USD
	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	85000	USD
CY2020Q4	mgy	Accrued Capital Expenditures Current AccruedCapitalExpendituresCurrent	16368000	USD
CY2019Q4	mgy	Accrued Capital Expenditures Current AccruedCapitalExpendituresCurrent	40722000	USD
CY2020Q4	mgy	Accrued Generaland Administrative Expenses Current AccruedGeneralandAdministrativeExpensesCurrent	11243000	USD
CY2019Q4	mgy	Accrued Generaland Administrative Expenses Current AccruedGeneralandAdministrativeExpensesCurrent	9753000	USD
CY2020Q4	mgy	Accrued Interest Current AccruedInterestCurrent	10000000	USD
CY2019Q4	mgy	Accrued Interest Current AccruedInterestCurrent	10000000	USD
CY2020Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current And Noncurrent AccrualForTaxesOtherThanIncomeTaxesCurrentAndNoncurrent	8145000	USD
CY2019Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current And Noncurrent AccrualForTaxesOtherThanIncomeTaxesCurrentAndNoncurrent	8741000	USD
CY2020Q4	us-gaap	Other Sundry Liabilities Current OtherSundryLiabilitiesCurrent	20567000	USD
CY2019Q4	us-gaap	Other Sundry Liabilities Current OtherSundryLiabilitiesCurrent	26564000	USD
CY2020Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	66323000	USD
CY2019Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	95780000	USD
CY2020	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	5718000	USD
CY2019	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	5512000	USD
CY2019Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	95542000	USD
CY2018Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	85983000	USD
CY2018Q3	us-gaap	Asset Retirement Obligation AssetRetirementObligation	0	USD
CY2017Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	3929000	USD
CY2020	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	-14883000	USD
CY2019	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	69000	USD
	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	39584000	USD
	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	0	USD
CY2020	mgy	Asset Retirement Obligation Liabilities Incurredand Assumed Through Business Combination AssetRetirementObligationLiabilitiesIncurredandAssumedThroughBusinessCombination	3484000	USD
CY2019	mgy	Asset Retirement Obligation Liabilities Incurredand Assumed Through Business Combination AssetRetirementObligationLiabilitiesIncurredandAssumedThroughBusinessCombination	7082000	USD
	mgy	Asset Retirement Obligation Liabilities Incurredand Assumed Through Business Combination AssetRetirementObligationLiabilitiesIncurredandAssumedThroughBusinessCombination	44897000	USD
	mgy	Asset Retirement Obligation Liabilities Incurredand Assumed Through Business Combination AssetRetirementObligationLiabilitiesIncurredandAssumedThroughBusinessCombination	553000	USD
CY2020	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	1457000	USD
	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	1668000	USD
	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	104000	USD
CY2020Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	88404000	USD
CY2019Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	95542000	USD
CY2018Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	85983000	USD
CY2018Q3	us-gaap	Asset Retirement Obligation AssetRetirementObligation	4501000	USD
CY2020Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	400000000	USD
CY2019Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	400000000	USD
CY2020Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	8885000	USD
CY2019Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	10165000	USD
CY2020Q4	us-gaap	Long Term Debt LongTermDebt	391115000	USD
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	389835000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	324000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-79340000	USD
CY2020	mgy	Lessee Operating Lease Remaining Lease Term LesseeOperatingLeaseRemainingLeaseTerm	P7Y
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	6470000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	4035000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	1801000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	2550000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	5703000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	1476000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	7504000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	4026000	USD
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P4Y2M12D
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P1Y10M24D
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.040
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.038
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.122
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	3400000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	2800000	USD
CY2020	us-gaap	Short Term Lease Cost ShortTermLeaseCost	21400000	USD
CY2019	us-gaap	Short Term Lease Cost ShortTermLeaseCost	26900000	USD
CY2020	us-gaap	Variable Lease Cost VariableLeaseCost	1700000	USD
CY2019	us-gaap	Variable Lease Cost VariableLeaseCost	3200000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	3000000.0	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	2800000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	2054000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	1843000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	1391000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	1139000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	1135000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	600000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	8162000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	14760000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	658000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	7504000	USD
CY2020Q4	us-gaap	Litigation Reserve LitigationReserve	0	USD
CY2019Q4	us-gaap	Litigation Reserve LitigationReserve	0	USD
CY2020Q4	us-gaap	Purchase Obligation PurchaseObligation	2198000	USD
CY2020Q4	us-gaap	Purchase Obligation Due In Next Twelve Months PurchaseObligationDueInNextTwelveMonths	674000	USD
CY2020Q4	us-gaap	Purchase Obligation Due In Second And Third Year PurchaseObligationDueInSecondAndThirdYear	1140000	USD
CY2020Q4	us-gaap	Purchase Obligation Due In Fourth And Fifth Year PurchaseObligationDueInFourthAndFifthYear	384000	USD
CY2020Q4	us-gaap	Purchase Obligation Due After Fifth Year PurchaseObligationDueAfterFifthYear	0	USD
CY2020Q4	mgy	Lessee Operating Lease Liability And Operating Lease Not Yet Commenced LesseeOperatingLeaseLiabilityAndOperatingLeaseNotYetCommenced	8162000	USD
CY2020Q4	mgy	Lessee Operating Lease Liabilityand Operating Lease Not Yet Commenced Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityandOperatingLeaseNotYetCommencedPaymentsDueNextTwelveMonths	2054000	USD
CY2020Q4	mgy	Lessee Operating Lease Liabilityand Operating Lease Not Yet Commenced Payments Duein Secondand Third Year LesseeOperatingLeaseLiabilityandOperatingLeaseNotYetCommencedPaymentsDueinSecondandThirdYear	3234000	USD
CY2020Q4	mgy	Lessee Operating Lease Liabilityand Operating Lease Not Yet Commenced Payments Duein Fourthand Fifth Year LesseeOperatingLeaseLiabilityandOperatingLeaseNotYetCommencedPaymentsDueinFourthandFifthYear	2274000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	11455000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1785000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	0	USD
CY2020Q4	mgy	Lessee Operating Lease Liabilityand Operating Lease Not Yet Commenced Payments Dueafter Fifth Year LesseeOperatingLeaseLiabilityandOperatingLeaseNotYetCommencedPaymentsDueafterFifthYear	600000	USD
CY2020Q4	us-gaap	Contractual Obligation ContractualObligation	10360000	USD
CY2020Q4	us-gaap	Contractual Obligation Due In Next Twelve Months ContractualObligationDueInNextTwelveMonths	2728000	USD
CY2020Q4	us-gaap	Contractual Obligation Due In Second And Third Year ContractualObligationDueInSecondAndThirdYear	4374000	USD
CY2020Q4	us-gaap	Contractual Obligation Due In Fourth And Fifth Year ContractualObligationDueInFourthAndFifthYear	2658000	USD
CY2020Q4	us-gaap	Contractual Obligation Due After Fifth Year ContractualObligationDueAfterFifthYear	600000	USD
CY2020	mgy	Contractual Obligation Costs Incurred ContractualObligationCostsIncurred	1200000	USD
CY2019	mgy	Contractual Obligation Costs Incurred ContractualObligationCostsIncurred	1500000	USD
CY2018	mgy	Contractual Obligation Costs Incurred ContractualObligationCostsIncurred	700000	USD
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-1167000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-1054000	USD
	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	-339000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	499000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	USD
CY2020	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.041
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.148
	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	381000	USD
	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1461000	USD
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-1506000	USD
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-409148000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	499000	USD
	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-673000	USD
	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	1461000	USD
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-71792000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	13817000	USD
	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	11431000	USD
	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	0	USD
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-6042000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	444000	USD
	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	697000	USD
	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	324000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-77834000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	14261000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	12128000	USD
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	20966000	USD
	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	19706000	USD
	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	0	USD
CY2020	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-12759000	USD
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	847000	USD
	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1028000	USD
	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1785000	USD
CY2020	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	-141027000	USD
CY2019	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	7309000	USD
	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	9103000	USD
	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	0	USD
CY2020	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	201786000	USD
CY2019	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	0	USD
	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	0	USD
	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	0	USD
CY2020	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-246000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	256000	USD
	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-176000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-79340000	USD
	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	0	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	14760000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	11455000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1785000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Investments DeferredTaxAssetsInvestments	162437000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Investments DeferredTaxAssetsInvestments	0	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	28461000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	1274000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Capital Loss Carryforwards DeferredTaxAssetsCapitalLossCarryforwards	1727000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Capital Loss Carryforwards DeferredTaxAssetsCapitalLossCarryforwards	0	USD
CY2020Q4	us-gaap	Deferred Tax Assets Property Plant And Equipment DeferredTaxAssetsPropertyPlantAndEquipment	6224000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Property Plant And Equipment DeferredTaxAssetsPropertyPlantAndEquipment	0	USD
CY2020Q4	mgy	Deferred Tax Assets Capitalized Transaction Costs DeferredTaxAssetsCapitalizedTransactionCosts	2937000	USD
CY2019Q4	mgy	Deferred Tax Assets Capitalized Transaction Costs DeferredTaxAssetsCapitalizedTransactionCosts	3185000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	201786000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	4459000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Investment In Noncontrolled Affiliates DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates	0	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Investment In Noncontrolled Affiliates DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates	76260000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	0	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	6033000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	0	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	82293000	USD
CY2020Q4	mgy	Deferred Tax Assets Net Before Valuation Allowance DeferredTaxAssetsNetBeforeValuationAllowance	201786000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	77834000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	201786000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	0	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	77834000	USD
CY2020	us-gaap	Tax Adjustments Settlements And Unusual Provisions TaxAdjustmentsSettlementsAndUnusualProvisions	-1200000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	201800000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	201800000	USD
CY2019Q3	us-gaap	Class Of Warrant Or Right Outstanding ClassOfWarrantOrRightOutstanding	31700000	shares
	mgy	Classof Warrantor Right Noncash Deemed Dividend ClassofWarrantorRightNoncashDeemedDividend	2800000	USD
	mgy	Adjustmentsto Additional Paidin Capital Offering Expenses Incurredin Connectionwith Warrants Exchange AdjustmentstoAdditionalPaidinCapitalOfferingExpensesIncurredinConnectionwithWarrantsExchange	2200000	USD
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	10000000.0	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	11100000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	1900000	USD
	us-gaap	Interest Paid Net InterestPaidNet	0	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-724000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	390000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	0	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	336000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	25895000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	26226000	USD
	us-gaap	Interest Paid Net InterestPaidNet	889000	USD
CY2020	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	16368000	USD
CY2019	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	40722000	USD
	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	50633000	USD
	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	38028000	USD
CY2020	mgy	Noncashor Part Noncash Acquisition Contingent Consideration Issued NoncashorPartNoncashAcquisitionContingentConsiderationIssued	0	USD
CY2019	mgy	Noncashor Part Noncash Acquisition Contingent Consideration Issued NoncashorPartNoncashAcquisitionContingentConsiderationIssued	0	USD
	mgy	Noncashor Part Noncash Acquisition Contingent Consideration Issued NoncashorPartNoncashAcquisitionContingentConsiderationIssued	149700000	USD
	mgy	Noncashor Part Noncash Acquisition Contingent Consideration Issued NoncashorPartNoncashAcquisitionContingentConsiderationIssued	0	USD
CY2020	us-gaap	Noncash Or Part Noncash Acquisition Intangible Assets Acquired1 NoncashOrPartNoncashAcquisitionIntangibleAssetsAcquired1	0	USD
CY2019	us-gaap	Noncash Or Part Noncash Acquisition Intangible Assets Acquired1 NoncashOrPartNoncashAcquisitionIntangibleAssetsAcquired1	0	USD
	us-gaap	Noncash Or Part Noncash Acquisition Intangible Assets Acquired1 NoncashOrPartNoncashAcquisitionIntangibleAssetsAcquired1	44400000	USD
	us-gaap	Noncash Or Part Noncash Acquisition Intangible Assets Acquired1 NoncashOrPartNoncashAcquisitionIntangibleAssetsAcquired1	0	USD
CY2020	us-gaap	Business Combination Consideration Transferred Equity Interests Issued And Issuable BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable	0	USD
CY2019	us-gaap	Business Combination Consideration Transferred Equity Interests Issued And Issuable BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable	33693000	USD
	us-gaap	Business Combination Consideration Transferred Equity Interests Issued And Issuable BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable	1481692000	USD
	us-gaap	Business Combination Consideration Transferred Equity Interests Issued And Issuable BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable	0	USD
CY2020	mgy	Classof Warrantor Right Noncash Deemed Dividend ClassofWarrantorRightNoncashDeemedDividend	0	USD
CY2019	mgy	Classof Warrantor Right Noncash Deemed Dividend ClassofWarrantorRightNoncashDeemedDividend	2763000	USD
	mgy	Classof Warrantor Right Noncash Deemed Dividend ClassofWarrantorRightNoncashDeemedDividend	0	USD
	mgy	Classof Warrantor Right Noncash Deemed Dividend ClassofWarrantorRightNoncashDeemedDividend	0	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	5923000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	6720000	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

Files In Submission

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$MGY
Magnolia Oil & Gas Corp Stock $mgy

2020 Q4 Form 10-K Financial Statement

#000169899021000003 Filed on February 23, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MGY Magnolia Oil & Gas Corp Stock $mgy

2020 Q4 Form 10-K Financial Statement

#000169899021000003 Filed on February 23, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MGY
Magnolia Oil & Gas Corp Stock $mgy