$GPOR
GULFPORT ENERGY CORP Stock $gpor

$gpor Overview Financials Valuation SEC Filings Company Website

2020 Q4 Form 10-K Financial Statement

#000162828021004026 Filed on March 05, 2021

Income Statement

Concept	2020 Q4	2019 Q4	2019 Q3
Revenue	$244.7M	$336.5M	$341.7M
YoY Change	-27.27%	-19.11%	-5.32%
Cost Of Revenue	$23.37M	$24.32M	$135.0M
YoY Change	-3.91%	-34.48%	71.08%
Gross Profit	$221.4M	$256.9M	$206.7M
YoY Change	-13.85%	-32.18%	-26.7%
Gross Profit Margin	90.45%	76.37%	60.5%
Selling, General & Admin	$134.3M	$79.49M	$148.2M
YoY Change	68.97%	-3.86%	56.4%
% of Gross Profit	60.68%	30.94%	71.69%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$45.38M	$143.5M	$163.3M
YoY Change	-68.37%	7.2%	36.15%
% of Gross Profit	20.5%	55.83%	78.97%
Operating Expenses	$180.5M	$223.7M	$304.0M
YoY Change	-19.32%	2.83%	22.89%
Operating Profit	$19.63M	-$1.444B	-$571.0M
YoY Change	-101.36%	-1022.93%	-595.98%
Interest Expense	-$20.34M	-$84.30M	$35.56M
YoY Change	-75.87%	221.54%	6.93%
% of Operating Profit	-103.6%
Other Income/Expense, Net	-$12.50M	$32.00K	-$57.89M
YoY Change	-39159.38%	-103.03%	214.2%
Pretax Income	-$165.6M	-$1.499B	-$628.8M
YoY Change	-88.95%	-1218.6%	-760.9%
Income Tax	$0.00	$315.8M	-$144.0M
% Of Pretax Income
Net Earnings	-$165.6M	-$1.815B	-$484.8M
YoY Change	-90.88%	-1454.28%	-609.51%
Net Earnings / Revenue	-67.65%	-539.35%	-141.86%
Basic Earnings Per Share	-$1.03	-$11.36	-$3.04
Diluted Earnings Per Share	-$1.03	-$11.36	-$3.04
COMMON SHARES
Basic Shares Outstanding	160.8M shares	159.7M shares	159.5M shares
Diluted Shares Outstanding			159.5M shares

Balance Sheet

Concept	2020 Q4	2019 Q4	2019 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$89.86M	$6.060M	$10.12M
YoY Change	1382.85%	-88.41%	-91.87%
Cash & Equivalents	$89.86M	$6.060M	$10.12M
Short-Term Investments
Other Short-Term Assets	$187.8M	$130.6M	$140.2M
YoY Change	43.77%	316.44%	374.53%
Inventory
Prepaid Expenses
Receivables	$119.9M	$121.2M	$112.7M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$409.8M	$305.9M	$304.3M
YoY Change	33.96%	-3.31%	-13.32%
LONG-TERM ASSETS
Property, Plant & Equipment	$2.086B	$3.464B	$5.585B
YoY Change	-39.77%	-36.79%	1.12%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$24.82M	$32.04M	$73.96M
YoY Change	-22.56%	-86.43%	-68.19%
Other Assets	$18.37M	$15.54M	$11.65M
YoY Change	18.22%	12.58%	-31.61%
Total Long-Term Assets	$2.130B	$3.577B	$5.969B
YoY Change	-40.45%	-37.63%	3.19%
TOTAL ASSETS
Total Short-Term Assets	$409.8M	$305.9M	$304.3M
Total Long-Term Assets	$2.130B	$3.577B	$5.969B
Total Assets	$2.540B	$3.883B	$6.273B
YoY Change	-34.59%	-35.83%	2.25%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$244.9M	$415.2M	$439.0M
YoY Change	-41.02%	-19.9%	-24.63%
Accrued Expenses	$0.00	$35.05M	$33.87M
YoY Change	-100.0%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$253.7M	$631.0K	$622.0K
YoY Change	40112.84%	-3.07%	-3.86%
Total Short-Term Liabilities	$510.3M	$451.2M	$473.9M
YoY Change	13.1%	-16.36%	-26.62%
LONG-TERM LIABILITIES
Long-Term Debt	$0.00	$1.978B	$2.077B
YoY Change	-100.0%	-5.21%	-1.15%
Other Long-Term Liabilities	$2.330B	$135.9M	$160.4M
YoY Change	1614.78%
Total Long-Term Liabilities	$36.60M	$2.117B	$2.077B
YoY Change	-98.27%	1.45%	-1.15%
TOTAL LIABILITIES
Total Short-Term Liabilities	$510.3M	$451.2M	$473.9M
Total Long-Term Liabilities	$36.60M	$2.117B	$2.077B
Total Liabilities	$2.840B	$2.568B	$2.714B
YoY Change	10.6%	-5.69%	-4.54%
SHAREHOLDERS EQUITY
Retained Earnings	-$4.473B	-$2.848B	-$596.9M
YoY Change	57.07%	236.86%	-39.05%
Common Stock	$1.607M	$1.597M	$1.597M
YoY Change	0.63%	-2.02%	-7.79%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	-$300.5M	$1.315B	$3.123B
YoY Change
Total Liabilities & Shareholders Equity	$2.540B	$3.883B	$6.273B
YoY Change	-34.59%	-35.83%	2.25%

Cashflow Statement

Concept	2020 Q4	2019 Q4	2019 Q3
OPERATING ACTIVITIES
Net Income	-$165.6M	-$1.815B	-$484.8M
YoY Change	-90.88%	-1454.28%	-609.51%
Depreciation, Depletion And Amortization	$45.38M	$143.5M	$163.3M
YoY Change	-68.37%	7.2%	36.15%
Cash From Operating Activities	-$104.7M	$106.6M	$217.6M
YoY Change	-198.18%	-31.41%	-1.01%
INVESTING ACTIVITIES
Capital Expenditures	-$28.72M	-$73.85M	-$138.6M
YoY Change	-61.11%	-39.82%	-30.08%
Acquisitions
YoY Change
Other Investing Activities	$4.826M	$37.73M	$10.19M
YoY Change	-87.21%	8735.13%	145.5%
Cash From Investing Activities	-$23.89M	-$36.12M	-$128.4M
YoY Change	-33.86%	-70.46%	-33.83%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	167.4M	-74.58M	-99.82M
YoY Change	-324.47%	-29.28%	391.78%
NET CHANGE
Cash From Operating Activities	-104.7M	106.6M	217.6M
Cash From Investing Activities	-23.89M	-36.12M	-128.4M
Cash From Financing Activities	167.4M	-74.58M	-99.82M
Net Change In Cash	38.82M	-4.064M	-10.65M
YoY Change	-1055.17%	-94.38%	-296.77%
FREE CASH FLOW
Cash From Operating Activities	-$104.7M	$106.6M	$217.6M
Capital Expenditures	-$28.72M	-$73.85M	-$138.6M
Free Cash Flow	-$75.98M	$180.5M	$356.2M
YoY Change	-142.1%	-35.12%	-14.79%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2020	dei	Entity Central Index Key EntityCentralIndexKey	0000874499
CY2020	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
CY2020	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
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	001-19514
CY2020	dei	Entity Registrant Name EntityRegistrantName	Gulfport Energy Corp
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	73-1521290
CY2020	dei	Entity Address Address Line1 EntityAddressAddressLine1	3001 Quail Springs Parkway
CY2020	dei	Entity Address City Or Town EntityAddressCityOrTown	Oklahoma City,
CY2020	dei	Entity Address State Or Province EntityAddressStateOrProvince	OK
CY2020	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	73134
CY2020	dei	City Area Code CityAreaCode	405
CY2020	dei	Local Phone Number LocalPhoneNumber	252-4600
CY2020	dei	Trading Symbol TradingSymbol	GPORQ
CY2020	dei	Security12g Title Security12gTitle	Common Stock
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
CY2020	dei	Entity Small Business EntitySmallBusiness	false
CY2020	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
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CY2020	dei	Entity Shell Company EntityShellCompany	false
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CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	48630000	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2020	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	0	USD
CY2019	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	0	USD
CY2018	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	124768000	USD
CY2020	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-11055000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-210148000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	49904000	USD
CY2020	us-gaap	Reorganization Items ReorganizationItems	152359000	USD
CY2019	us-gaap	Reorganization Items ReorganizationItems	0	USD
CY2018	us-gaap	Reorganization Items ReorganizationItems	0	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-21738000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-3725000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-1542000	USD
CY2020	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-255238000	USD
CY2019	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-306228000	USD
CY2018	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	31532000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-1617843000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-2009921000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	430491000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7290000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-7563000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-69000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	-1625133000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-2002358000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	430560000	USD
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-10.14
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-12.49
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.46
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-10.14
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-12.49
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.45
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	160231335	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	160341125	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	174675840	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	160231335	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	160341125	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	175398706	shares
CY2020	us-gaap	Net Income Loss NetIncomeLoss	-1625133000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-2002358000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	430560000	USD
CY2020	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	3833000	USD
CY2019	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	9193000	USD
CY2018	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-15487000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	3833000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	9193000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-15487000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-1621300000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-1993165000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	415073000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	0	USD
CY2020	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	0	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	0	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	3101614000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	430560000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-15487000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	11332000	USD
CY2018	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	200251000	USD
CY2018	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	3327768000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-2002358000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	9193000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	10677000	USD
CY2019	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	30688000	USD
CY2019	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	1314592000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	-1625133000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	3833000	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	6444000	USD
CY2020	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	236000	USD
CY2020	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	-300500000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	-1625133000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-2002358000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	430560000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	239744000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	550108000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	486664000	USD
CY2020	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	1357099000	USD
CY2019	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	2039770000	USD
CY2018	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	0	USD
CY2020	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-11055000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-210289000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	49625000	USD
CY2020	gpor	Gain Losson Extinguishmentof Debt Net GainLossonExtinguishmentofDebtNet	49579000	USD
CY2019	gpor	Gain Losson Extinguishmentof Debt Net GainLossonExtinguishmentofDebtNet	48630000	USD
CY2018	gpor	Gain Losson Extinguishmentof Debt Net GainLossonExtinguishmentofDebtNet	0	USD
CY2020	us-gaap	Unrealized Gain Loss On Derivatives And Commodity Contracts UnrealizedGainLossOnDerivativesAndCommodityContracts	65291000	USD
CY2019	us-gaap	Unrealized Gain Loss On Derivatives And Commodity Contracts UnrealizedGainLossOnDerivativesAndCommodityContracts	208360000	USD
CY2018	us-gaap	Unrealized Gain Loss On Derivatives And Commodity Contracts UnrealizedGainLossOnDerivativesAndCommodityContracts	-123479000	USD
CY2020	gpor	Cash Settlement On Derivative Instruments CashSettlementOnDerivativeInstruments	159394000	USD
CY2019	gpor	Cash Settlement On Derivative Instruments CashSettlementOnDerivativeInstruments	123130000	USD
CY2018	gpor	Cash Settlement On Derivative Instruments CashSettlementOnDerivativeInstruments	-58428000	USD
CY2020	gpor	Non Cash Reorganization Items NonCashReorganizationItems	21956000	USD
CY2019	gpor	Non Cash Reorganization Items NonCashReorganizationItems	0	USD
CY2018	gpor	Non Cash Reorganization Items NonCashReorganizationItems	0	USD
CY2020	gpor	Deferred Income Tax Expense Benefit Including Discontinued Operations DeferredIncomeTaxExpenseBenefitIncludingDiscontinuedOperations	7290000	USD
CY2019	gpor	Deferred Income Tax Expense Benefit Including Discontinued Operations DeferredIncomeTaxExpenseBenefitIncludingDiscontinuedOperations	-7563000	USD
CY2018	gpor	Deferred Income Tax Expense Benefit Including Discontinued Operations DeferredIncomeTaxExpenseBenefitIncludingDiscontinuedOperations	1208000	USD
CY2020	gpor	Equity Method Investment Realized Gain Losson Disposaland Other Assets EquityMethodInvestmentRealizedGainLossonDisposalandOtherAssets	0	USD
CY2019	gpor	Equity Method Investment Realized Gain Losson Disposaland Other Assets EquityMethodInvestmentRealizedGainLossonDisposalandOtherAssets	220000	USD
CY2018	gpor	Equity Method Investment Realized Gain Losson Disposaland Other Assets EquityMethodInvestmentRealizedGainLossonDisposalandOtherAssets	124768000	USD
CY2020	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	0	USD
CY2019	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	2457000	USD
CY2018	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	3206000	USD
CY2020	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	31984000	USD
CY2019	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	15178000	USD
CY2018	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	17039000	USD
CY2020	us-gaap	Increase Decrease In Operating Capital IncreaseDecreaseInOperatingCapital	-6785000	USD
CY2019	us-gaap	Increase Decrease In Operating Capital IncreaseDecreaseInOperatingCapital	-50192000	USD
CY2018	us-gaap	Increase Decrease In Operating Capital IncreaseDecreaseInOperatingCapital	43064000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	95304000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	723993000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	786271000	USD
CY2020	us-gaap	Payments To Acquire Oil And Gas Property PaymentsToAcquireOilAndGasProperty	367287000	USD
CY2019	us-gaap	Payments To Acquire Oil And Gas Property PaymentsToAcquireOilAndGasProperty	720057000	USD
CY2018	us-gaap	Payments To Acquire Oil And Gas Property PaymentsToAcquireOilAndGasProperty	899083000	USD
CY2020	us-gaap	Proceeds From Sale Of Oil And Gas Property And Equipment ProceedsFromSaleOfOilAndGasPropertyAndEquipment	50971000	USD
CY2019	us-gaap	Proceeds From Sale Of Oil And Gas Property And Equipment ProceedsFromSaleOfOilAndGasPropertyAndEquipment	48527000	USD
CY2018	us-gaap	Proceeds From Sale Of Oil And Gas Property And Equipment ProceedsFromSaleOfOilAndGasPropertyAndEquipment	5114000	USD
CY2020	us-gaap	Proceeds From Sale Of Equity Method Investments ProceedsFromSaleOfEquityMethodInvestments	0	USD
CY2019	us-gaap	Proceeds From Sale Of Equity Method Investments ProceedsFromSaleOfEquityMethodInvestments	0	USD
CY2018	us-gaap	Proceeds From Sale Of Equity Method Investments ProceedsFromSaleOfEquityMethodInvestments	226487000	USD
CY2020	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-1729000	USD
CY2019	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	3241000	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	9392000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-314587000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-674771000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-676874000	USD
CY2020	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	383290000	USD
CY2019	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	877000000	USD
CY2018	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	220000000	USD
CY2020	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	713701000	USD
CY2019	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	952000000	USD
CY2018	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	265000000	USD
CY2020	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	90000000	USD
CY2019	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	0	USD
CY2018	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	0	USD
CY2020	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	90000000	USD
CY2019	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	0	USD
CY2018	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	0	USD
CY2020	us-gaap	Repayments Of Senior Debt RepaymentsOfSeniorDebt	22827000	USD
CY2019	us-gaap	Repayments Of Senior Debt RepaymentsOfSeniorDebt	138786000	USD
CY2018	us-gaap	Repayments Of Senior Debt RepaymentsOfSeniorDebt	0	USD
CY2020	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	2988000	USD
CY2019	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	0	USD
CY2018	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	0	USD
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	30000000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	200251000	USD
CY2020	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-1512000	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-1673000	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-1406000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	303084000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-95459000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-156657000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	83801000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-46237000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-47260000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	6060000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	52297000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	99557000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	89861000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	6060000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	52297000	USD
CY2020	gpor	Decrease In Capital Spending Percentage DecreaseInCapitalSpendingPercentage	0.50
CY2020	gpor	Accounts Receivable Collection Period AccountsReceivableCollectionPeriod	P30D
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	0	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	0	USD
CY2020	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	1400000000	USD
CY2020	gpor	Conversion Ratio Gas To Barrels Of Oil ConversionRatioGasToBarrelsOfOil	6	bbl
CY2020Q4	us-gaap	Capitalized Costs Of Unproved Properties Excluded From Amortization Cumulative CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative	1500000000	USD
CY2019Q4	us-gaap	Capitalized Costs Of Unproved Properties Excluded From Amortization Cumulative CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative	1700000000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-39190000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-54677000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-45484000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-41651000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	0	USD
CY2020	gpor	Accounts Receivable Collection Period AccountsReceivableCollectionPeriod	P30D
CY2018	us-gaap	Equity Method Investment Other Than Temporary Impairment EquityMethodInvestmentOtherThanTemporaryImpairment	0	USD
CY2020	us-gaap	Use Of Estimates UseOfEstimates	<div style="margin-bottom:12pt"><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="margin-bottom:12pt;text-indent:18pt"><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 accounting principles generally accepted in the United States of America requires management to make estimates, judgments and assumptions that affect the reported amounts of assets and liabilities as of the date of the financial statements and revenues and expenses during the reporting period. Actual results could differ materially from those estimates. Significant estimates with regard to these financial statements include the estimate of proved oil and gas reserve quantities and the related present value of estimated future net cash flows there from, the amount and timing of asset retirement obligations, the realization of deferred tax assets, the fair value determination of acquired assets and liabilities and the realization of future net operating loss carryforwards available as reductions of income tax expense. The estimate of the Company’s oil and gas reserves is used to compute depletion, depreciation, amortization and impairment of oil and gas properties.</span></div>
CY2020	gpor	Payments For Reorganization Items PaymentsForReorganizationItems	24553000	USD
CY2019	gpor	Payments For Reorganization Items PaymentsForReorganizationItems	0	USD
CY2018	gpor	Payments For Reorganization Items PaymentsForReorganizationItems	0	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	84823000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	142664000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	132995000	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	0	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-1794000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	0	USD
CY2020	gpor	Capitalized Stock Based Compensation CapitalizedStockBasedCompensation	2860000	USD
CY2019	gpor	Capitalized Stock Based Compensation CapitalizedStockBasedCompensation	5766000	USD
CY2018	gpor	Capitalized Stock Based Compensation CapitalizedStockBasedCompensation	4533000	USD
CY2020	us-gaap	Asset Retirement Obligation Period Increase Decrease AssetRetirementObligationPeriodIncreaseDecrease	2358000	USD
CY2019	us-gaap	Asset Retirement Obligation Period Increase Decrease AssetRetirementObligationPeriodIncreaseDecrease	6883000	USD
CY2018	us-gaap	Asset Retirement Obligation Period Increase Decrease AssetRetirementObligationPeriodIncreaseDecrease	1452000	USD
CY2020	gpor	Asset Retirement Obligation Removed Due To Divestiture AssetRetirementObligationRemovedDueToDivestiture	2213000	USD
CY2019	gpor	Asset Retirement Obligation Removed Due To Divestiture AssetRetirementObligationRemovedDueToDivestiture	30146000	USD
CY2018	gpor	Asset Retirement Obligation Removed Due To Divestiture AssetRetirementObligationRemovedDueToDivestiture	0	USD
CY2020	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	907000	USD
CY2019	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	3372000	USD
CY2018	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	4470000	USD
CY2020	gpor	Transfer Of Debt To Dip Credit Facility TransferOfDebtToDIPCreditFacility	157500000	USD
CY2019	gpor	Transfer Of Debt To Dip Credit Facility TransferOfDebtToDIPCreditFacility	0	USD
CY2018	gpor	Transfer Of Debt To Dip Credit Facility TransferOfDebtToDIPCreditFacility	0	USD
CY2020	gpor	Noncash Or Part Noncash Acquisition Contingent Consideration NoncashOrPartNoncashAcquisitionContingentConsideration	23090000	USD
CY2019	gpor	Noncash Or Part Noncash Acquisition Contingent Consideration NoncashOrPartNoncashAcquisitionContingentConsideration	-1137000	USD
CY2018	gpor	Noncash Or Part Noncash Acquisition Contingent Consideration NoncashOrPartNoncashAcquisitionContingentConsideration	0	USD
CY2020	gpor	Foreign Currency Translation Gain Loss On Investment In Equity Method Investment ForeignCurrencyTranslationGainLossOnInvestmentInEquityMethodInvestment	3833000	USD
CY2019	gpor	Foreign Currency Translation Gain Loss On Investment In Equity Method Investment ForeignCurrencyTranslationGainLossOnInvestmentInEquityMethodInvestment	9193000	USD
CY2018	gpor	Foreign Currency Translation Gain Loss On Investment In Equity Method Investment ForeignCurrencyTranslationGainLossOnInvestmentInEquityMethodInvestment	-15487000	USD
CY2020	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style="margin-bottom:12pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%">Reclassifications</span></div><div style="margin-bottom:12pt;text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">In the fourth quarter of 2020, the Company updated the presentation of certain costs on its consolidated statements of operations to better align its cost reporting with industry peers. In particular, the Company created a new expense line item titled “Taxes other than income” in its consolidated statement of operations. This new line item includes production taxes, property taxes and certain other non-income tax related costs incurred. Prior period amounts have been reclassified to align to this new approach. The reclassifications have no impact on previously reported total assets, liabilities, net (loss) income or total operating cash flows.</span></div>
CY2019	us-gaap	Revenues Revenues	1563126000	USD
CY2019	us-gaap	Cost Of Revenue CostOfRevenue	508843000	USD
CY2019	us-gaap	Costs And Expenses CostsAndExpenses	3266819000	USD
CY2018	us-gaap	Revenues Revenues	1551701000	USD
CY2018	us-gaap	Cost Of Revenue CostOfRevenue	486845000	USD
CY2018	us-gaap	Costs And Expenses CostsAndExpenses	1152742000	USD
CY2020Q4	gpor	Debtor In Possession Financing Percentage Of Lenders Involved DebtorInPossessionFinancingPercentageOfLendersInvolved	0.95
CY2020	gpor	Holders Of An Allowed General Unsecured Claim Percentage Of New Common Stock Received HoldersOfAnAllowedGeneralUnsecuredClaimPercentageOfNewCommonStockReceived	0.94
CY2020	gpor	Holders Of An Allowed General Unsecured Claim Percentage Of New Common Stock Received HoldersOfAnAllowedGeneralUnsecuredClaimPercentageOfNewCommonStockReceived	0.94
CY2020Q4	us-gaap	Debtor In Possession Financing Letters Of Credit Outstanding DebtorInPossessionFinancingLettersOfCreditOutstanding	262500000	USD
CY2020Q4	us-gaap	Debtor In Possession Financing Amount Arranged DebtorInPossessionFinancingAmountArranged	105000000	USD
CY2020Q4	us-gaap	Debtor In Possession Financing Borrowings Outstanding DebtorInPossessionFinancingBorrowingsOutstanding	157500000	USD
CY2020	us-gaap	Debtor Reorganization Items Debtor In Possession Facility Financing Costs DebtorReorganizationItemsDebtorInPossessionFacilityFinancingCosts	3000000.0	USD
CY2020Q4	gpor	Liabilities Subject To Compromise Debt LiabilitiesSubjectToCompromiseDebt	2005219000	USD
CY2020Q4	us-gaap	Liabilities Subject To Compromise Accounts Payable And Accrued Liabilities LiabilitiesSubjectToCompromiseAccountsPayableAndAccruedLiabilities	164939000	USD
CY2020Q4	gpor	Liabilities Subject To Compromise Asset Retirement Obligation LiabilitiesSubjectToCompromiseAssetRetirementObligation	63566000	USD
CY2020Q4	gpor	Liabilities Subject To Compromise Accrued Interest LiabilitiesSubjectToCompromiseAccruedInterest	55634000	USD
CY2020Q4	us-gaap	Liabilities Subject To Compromise Other Liabilities LiabilitiesSubjectToCompromiseOtherLiabilities	4122000	USD
CY2020Q4	us-gaap	Liabilities Subject To Compromise LiabilitiesSubjectToCompromise	2293480000	USD
CY2020	us-gaap	Contractual Interest Expense On Prepetition Liabilities Not Recognized In Statement Of Operations ContractualInterestExpenseOnPrepetitionLiabilitiesNotRecognizedInStatementOfOperations	15300000	USD
CY2020	us-gaap	Debtor Reorganization Items Provision For Expected Allowed Claims DebtorReorganizationItemsProvisionForExpectedAllowedClaims	104943000	USD
CY2020	us-gaap	Debtor Reorganization Items Legal And Advisory Professional Fees DebtorReorganizationItemsLegalAndAdvisoryProfessionalFees	24905000	USD
CY2020	us-gaap	Debtor Reorganization Items Write Off Of Deferred Financing Costs And Debt Discounts DebtorReorganizationItemsWriteOffOfDeferredFinancingCostsAndDebtDiscounts	21956000	USD
CY2020	us-gaap	Debtor Reorganization Items Debtor In Possession Facility Financing Costs DebtorReorganizationItemsDebtorInPossessionFacilityFinancingCosts	2988000	USD
CY2020	us-gaap	Debtor Reorganization Items Gain Loss On Settlement Of Other Claims Net1 DebtorReorganizationItemsGainLossOnSettlementOfOtherClaimsNet1	-2433000	USD
CY2020	us-gaap	Reorganization Items ReorganizationItems	152359000	USD
CY2020Q4	us-gaap	Oil And Gas Property Full Cost Method Gross OilAndGasPropertyFullCostMethodGross	10816909000	USD
CY2019Q4	us-gaap	Oil And Gas Property Full Cost Method Gross OilAndGasPropertyFullCostMethodGross	10595735000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	85530000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	91198000	USD
CY2020Q4	us-gaap	Land Land	3008000	USD
CY2019Q4	us-gaap	Land Land	5521000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	10905447000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	10692454000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	8819178000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	7228660000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	2086269000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	3463794000	USD
CY2020	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	1400000000	USD
CY2019	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	2000000000.0	USD
CY2018	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	0	USD
CY2020	gpor	Capitalized General And Administrative Costs CapitalizedGeneralAndAdministrativeCosts	25000000.0	USD
CY2019	gpor	Capitalized General And Administrative Costs CapitalizedGeneralAndAdministrativeCosts	30100000	USD
CY2018	gpor	Capitalized General And Administrative Costs CapitalizedGeneralAndAdministrativeCosts	37700000	USD
CY2020	gpor	Depletionper Mc Fof Gas Equivalent DepletionperMCFofGasEquivalent	0.61	usd_per_mcf
CY2019	gpor	Depletionper Mc Fof Gas Equivalent DepletionperMCFofGasEquivalent	1.08	usd_per_mcf
CY2018	gpor	Depletionper Mc Fof Gas Equivalent DepletionperMCFofGasEquivalent	0.96	usd_per_mcf
CY2020	us-gaap	Acquisition Costs AcquisitionCosts	18485000	USD
CY2019	us-gaap	Acquisition Costs AcquisitionCosts	8067000	USD
CY2018	us-gaap	Acquisition Costs AcquisitionCosts	98876000	USD
CY2017	us-gaap	Acquisition Costs AcquisitionCosts	1330895000	USD
CY2020Q4	us-gaap	Acquisition Costs Cumulative AcquisitionCostsCumulative	1456323000	USD
CY2020	us-gaap	Exploration Costs ExplorationCosts	0	USD
CY2019	us-gaap	Exploration Costs ExplorationCosts	0	USD
CY2018	us-gaap	Exploration Costs ExplorationCosts	0	USD
CY2017	us-gaap	Exploration Costs ExplorationCosts	0	USD
CY2020Q4	us-gaap	Exploration Costs Cumulative ExplorationCostsCumulative	0	USD
CY2020	us-gaap	Development Costs DevelopmentCosts	0	USD
CY2019	us-gaap	Development Costs DevelopmentCosts	0	USD
CY2018	us-gaap	Development Costs DevelopmentCosts	0	USD
CY2017	us-gaap	Development Costs DevelopmentCosts	0	USD
CY2020Q4	us-gaap	Development Costs Cumulative DevelopmentCostsCumulative	0	USD
CY2020	gpor	Interest Cost Capitalized Not Subjectto Amortization InterestCostCapitalizedNotSubjecttoAmortization	0	USD
CY2019	gpor	Interest Cost Capitalized Not Subjectto Amortization InterestCostCapitalizedNotSubjecttoAmortization	121000	USD
CY2018	gpor	Interest Cost Capitalized Not Subjectto Amortization InterestCostCapitalizedNotSubjecttoAmortization	172000	USD
CY2017	gpor	Interest Cost Capitalized Not Subjectto Amortization InterestCostCapitalizedNotSubjecttoAmortization	427000	USD
CY2020Q4	us-gaap	Accumulated Capitalized Interest Costs AccumulatedCapitalizedInterestCosts	720000	USD
CY2020	us-gaap	Capitalized Costs Of Unproved Properties Excluded From Amortization CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization	18485000	USD
CY2019	us-gaap	Capitalized Costs Of Unproved Properties Excluded From Amortization CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization	8188000	USD
CY2018	us-gaap	Capitalized Costs Of Unproved Properties Excluded From Amortization CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization	99048000	USD
CY2017	us-gaap	Capitalized Costs Of Unproved Properties Excluded From Amortization CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization	1331322000	USD
CY2020Q4	us-gaap	Capitalized Costs Of Unproved Properties Excluded From Amortization Cumulative CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative	1457043000	USD
CY2020Q4	us-gaap	Capitalized Costs Of Unproved Properties Excluded From Amortization Cumulative CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative	1457043000	USD
CY2019Q4	us-gaap	Capitalized Costs Of Unproved Properties Excluded From Amortization Cumulative CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative	1700000000	USD
CY2020	gpor	Non Producing Leases Extension Term NonProducingLeasesExtensionTerm	P5Y
CY2020	gpor	Non Producing Leases Extension Term NonProducingLeasesExtensionTerm	P5Y
CY2019Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	60355000	USD
CY2018Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	79952000	USD
CY2020	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	2358000	USD
CY2019	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	5935000	USD
CY2020	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	0	USD
CY2019	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	273000	USD
CY2020	gpor	Asset Retirement Obligation Removed Due To Divestiture AssetRetirementObligationRemovedDueToDivestiture	2213000	USD
CY2019	gpor	Asset Retirement Obligation Removed Due To Divestiture AssetRetirementObligationRemovedDueToDivestiture	30146000	USD
CY2020	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	3066000	USD
CY2019	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	3939000	USD
CY2020	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	0	USD
CY2019	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	948000	USD
CY2020Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	63566000	USD
CY2019Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	60355000	USD
CY2020Q4	gpor	Liabilities Subject To Compromise Asset Retirement Obligation LiabilitiesSubjectToCompromiseAssetRetirementObligation	63566000	USD
CY2019Q4	gpor	Liabilities Subject To Compromise Asset Retirement Obligation LiabilitiesSubjectToCompromiseAssetRetirementObligation	0	USD
CY2020Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	0	USD
CY2019Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	60355000	USD
CY2020Q4	us-gaap	Equity Method Investments EquityMethodInvestments	24816000	USD
CY2019Q4	us-gaap	Equity Method Investments EquityMethodInvestments	32044000	USD
CY2020	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-11055000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-210148000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	49904000	USD
CY2020Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	0	USD
CY2019Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	23751000	USD
CY2020Q4	us-gaap	Long Term Debt LongTermDebt	2258962000	USD
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	1978651000	USD
CY2020Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	253743000	USD
CY2019Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	631000	USD
CY2020Q4	gpor	Liabilities Subject To Compromise Debt LiabilitiesSubjectToCompromiseDebt	2005219000	USD
CY2019Q4	gpor	Liabilities Subject To Compromise Debt LiabilitiesSubjectToCompromiseDebt	0	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	0	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1978020000	USD
CY2020	us-gaap	Debtor Reorganization Items Write Off Of Deferred Financing Costs And Debt Discounts DebtorReorganizationItemsWriteOffOfDeferredFinancingCostsAndDebtDiscounts	22000000.0	USD
CY2020Q4	us-gaap	Debtor In Possession Financing Letters Of Credit Outstanding DebtorInPossessionFinancingLettersOfCreditOutstanding	262500000	USD
CY2020Q4	us-gaap	Debtor In Possession Financing Amount Arranged DebtorInPossessionFinancingAmountArranged	105000000	USD
CY2020Q4	us-gaap	Debtor In Possession Financing Borrowings Outstanding DebtorInPossessionFinancingBorrowingsOutstanding	157500000	USD
CY2020	us-gaap	Debtor Reorganization Items Debtor In Possession Facility Financing Costs DebtorReorganizationItemsDebtorInPossessionFacilityFinancingCosts	3000000.0	USD
CY2020Q4	gpor	Debtor In Possession Financing Termination Number Of Business Days After Petition Date DebtorInPossessionFinancingTerminationNumberOfBusinessDaysAfterPetitionDate	3	day
CY2020Q4	gpor	Debtor In Possession Financing Termination Number Of Days After The Entry Of The Interim Order DebtorInPossessionFinancingTerminationNumberOfDaysAfterTheEntryOfTheInterimOrder	35	day
CY2020	us-gaap	Debtor Reorganization Items Write Off Of Deferred Financing Costs And Debt Discounts DebtorReorganizationItemsWriteOffOfDeferredFinancingCostsAndDebtDiscounts	22000000.0	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	84823000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	142664000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	132995000	USD
CY2020	gpor	Debt Instrument Increase Decrease Accrued Interest DebtInstrumentIncreaseDecreaseAccruedInterest	30600000	USD
CY2019	gpor	Debt Instrument Increase Decrease Accrued Interest DebtInstrumentIncreaseDecreaseAccruedInterest	-3834000	USD
CY2018	gpor	Debt Instrument Increase Decrease Accrued Interest DebtInstrumentIncreaseDecreaseAccruedInterest	7266000	USD
CY2020	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	907000	USD
CY2019	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	3372000	USD
CY2018	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	4470000	USD
CY2020	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	5563000	USD
CY2019	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	6328000	USD
CY2018	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	6121000	USD
CY2020	us-gaap	Interest Expense InterestExpense	120079000	USD
CY2019	us-gaap	Interest Expense InterestExpense	141786000	USD
CY2018	us-gaap	Interest Expense InterestExpense	141912000	USD
CY2018Q1	us-gaap	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	100000000	USD
CY2018Q2	gpor	Stock Repurchase Program Additional Authorized Amount StockRepurchaseProgramAdditionalAuthorizedAmount	100000000	USD
CY2018Q2	us-gaap	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	200000000	USD
CY2018	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	20700000	shares
CY2018	gpor	Stock Repurchasedand Retired During Period Value Net Of Tax StockRepurchasedandRetiredDuringPeriodValueNetOfTax	200000000.0	USD
CY2019	us-gaap	Shares Paid For Tax Withholding For Share Based Compensation SharesPaidForTaxWithholdingForShareBasedCompensation	100000	shares
CY2019Q1	us-gaap	Stock Repurchase Program Period In Force1 StockRepurchaseProgramPeriodInForce1	P24M
CY2020	us-gaap	Shares Paid For Tax Withholding For Share Based Compensation SharesPaidForTaxWithholdingForShareBasedCompensation	200000	shares
CY2020	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	200000	USD
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	700000	USD
CY2020	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	12500000	shares
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	16300000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	10700000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	11300000	USD
CY2020	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	2900000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	5800000	USD
CY2018	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	4500000	USD
CY2020Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	119900000	USD
CY2019Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	121200000	USD
CY2020	us-gaap	Revenue Performance Obligation Description Of Timing RevenuePerformanceObligationDescriptionOfTiming	However, settlement statements for certain sales may be received for 30 to 90 days after the date production is delivered, and as a result, the Company is required to estimate the amount of production that was delivered to the purchaser and the price that will be received for the sale of the product.
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	160341125	shares
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	129000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	115000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	90000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	30000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	364000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	22000	USD
CY2020Q4	gpor	Liabilities Subject To Compromise Operating Lease Liability LiabilitiesSubjectToCompromiseOperatingLeaseLiability	342000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	0	USD
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	9658000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	24960000	USD
CY2020	gpor	Operating Lease Cost Related Party OperatingLeaseCostRelatedParty	0	USD
CY2019	gpor	Operating Lease Cost Related Party OperatingLeaseCostRelatedParty	22440000	USD
CY2020	us-gaap	Variable Lease Cost VariableLeaseCost	586000	USD
CY2019	us-gaap	Variable Lease Cost VariableLeaseCost	2172000	USD
CY2020	gpor	Variable Lease Cost Related Party VariableLeaseCostRelatedParty	0	USD
CY2019	gpor	Variable Lease Cost Related Party VariableLeaseCostRelatedParty	66924000	USD
CY2020	us-gaap	Short Term Lease Cost ShortTermLeaseCost	9361000	USD
CY2019	us-gaap	Short Term Lease Cost ShortTermLeaseCost	834000	USD
CY2020	us-gaap	Lease Cost LeaseCost	19605000	USD
CY2019	us-gaap	Lease Cost LeaseCost	117330000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	140000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	182000	USD
CY2020	us-gaap	Operating Lease Payments Use OperatingLeasePaymentsUse	10272000	USD
CY2019	us-gaap	Operating Lease Payments Use OperatingLeasePaymentsUse	24263000	USD
CY2020	gpor	Operating Lease Payments Use Related Party OperatingLeasePaymentsUseRelatedParty	6800000	USD
CY2019	gpor	Operating Lease Payments Use Related Party OperatingLeasePaymentsUseRelatedParty	84750000	USD
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P3Y10D
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0422
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	0	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	0	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	-1530000	USD
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-273000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-7000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	253000	USD
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	7563000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-7556000	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	1530000	USD
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	0	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	0	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-322000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7290000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-7563000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-69000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-1617843000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-2009921000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	430491000	USD
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-339747000	USD
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-422083000	USD
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	90403000	USD
CY2020	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-14696000	USD
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-28316000	USD
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-511000	USD
CY2020	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	10800000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	3372000	USD
CY2018	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	1078000	USD
CY2020	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	350933000	USD
CY2018	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-91039000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7290000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-7563000	USD
CY2019	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	439464000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-69000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	392318000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	269851000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	164363000	USD
CY2020Q4	gpor	Deferred Tax Asset Oiland Gas Property Basis Difference DeferredTaxAssetOilandGasPropertyBasisDifference	463705000	USD
CY2019Q4	gpor	Deferred Tax Asset Oiland Gas Property Basis Difference DeferredTaxAssetOilandGasPropertyBasisDifference	289850000	USD
CY2018Q4	gpor	Deferred Tax Asset Oiland Gas Property Basis Difference DeferredTaxAssetOilandGasPropertyBasisDifference	3595000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Investment In Subsidiaries DeferredTaxAssetsInvestmentInSubsidiaries	61078000	USD
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CY2020Q4	gpor	Supply Commitment Duein Next Twelve Months SupplyCommitmentDueinNextTwelveMonths	88000	MMBTU
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CY2020	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Percent DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent	1
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CY2020	us-gaap	Loss Contingency Disclosures LossContingencyDisclosures	CONTINGENCIES<div style="margin-bottom:12pt"><span style="background-color:#ffffff;color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%">Litigation and Regulatory Proceedings</span></div><div style="margin-bottom:12pt;text-indent:18pt"><span style="background-color:#ffffff;color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The Company is involved in a number of litigation and regulatory proceedings that may result in material liabilities, including those described below. Many of these proceedings are in early stages, and many of them seek or may seek damages and penalties, the amount of which is indeterminate. The Company's total accrued liabilities in respect of litigation and regulatory proceedings is determined on a case-by-case basis and represents an estimate of probable losses after considering, among other factors, the progress of each case or proceeding, its experience and the experience of others in similar cases or proceedings, and the opinions and views of legal counsel. Significant judgment is required in making these estimates and their final liabilities may ultimately be materially different.</span></div><div style="margin-bottom:12pt;text-indent:18pt"><span style="background-color:#ffffff;color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The Company, along with a number of other oil and gas companies, has been named as a defendant in two separate complaints, one filed by the State of Louisiana and the Parish of Cameron in the 38th Judicial District Court for the Parish of Cameron on February 9, 2016 and the other filed by the State of Louisiana and the District Attorney for the 15</span><span style="background-color:#ffffff;color:#000000;font-family:'Times New Roman',sans-serif;font-size:6.5pt;font-weight:400;line-height:120%;position:relative;top:-3.5pt;vertical-align:baseline">th</span><span style="background-color:#ffffff;color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%"> Judicial District </span></div><div style="margin-bottom:12pt"><span style="background-color:#ffffff;color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">of the State of Louisiana in the 15</span><span style="background-color:#ffffff;color:#000000;font-family:'Times New Roman',sans-serif;font-size:6.5pt;font-weight:400;line-height:120%;position:relative;top:-3.5pt;vertical-align:baseline">th</span><span style="background-color:#ffffff;color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%"> Judicial District Court for the Parish of Vermilion on July 29, 2016 (together, the "Complaints"). The Complaints allege that certain of the defendants’ operations violated the State and Local Coastal Resources Management Act of 1978, as amended, and the rules, regulations, orders and ordinances adopted thereunder (the "CZM Laws") by causing substantial damage to land and </span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">waterbodies located in the coastal zone of the relevant Parish. The plaintiffs seek damages and other appropriate relief under the CZM Laws, including the payment of costs necessary to clear, re-vegetate, detoxify and otherwise restore the affected coastal zone of the relevant Parish to its original condition, actual restoration of such coastal zone to its original condition, and the payment of reasonable attorney fees and legal expenses and interest. The United States District Court for the Western District of Louisiana issued orders remanding the cases to their respective state court, and the defendants have appealed the remand orders to the 5th Circuit Court of Appeals.</span></div><div style="margin-bottom:12pt;text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">In July 2019, Pigeon Land Company, Inc., a successor in interest to certain of the Company's legacy Louisiana properties, filed an action against the Company and a number of other oil and gas companies in the 16th Judicial District Court for the Parish of Iberia in Louisiana. The suit alleged negligence, strict liability and various violations of Louisiana statutes relating to property damage in connection with the historic development of the Company's Louisiana properties and sought unspecified damages (including punitive damages), an injunction to return the affected property to its original condition, and the payment of reasonable attorney fees and legal expenses and interest. This matter was voluntarily dismissed without prejudice on December 8, 2020.</span></div><div style="margin-bottom:12pt;text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">In September 2019, a stockholder of Mammoth Energy filed a derivative action on behalf of Mammoth Energy against members of Mammoth Energy’s board of directors, including a director designated by the Company, and its significant stockholders, including the Company, in the United States District Court for the Western District of Oklahoma. In January 2020, plaintiffs consolidated actions against the same defendants in the United States District Court for the District of Delaware. The consolidated and amended complaint alleges, among other things, that the Company breached its fiduciary duties and misappropriated information as a controlling shareholder of Mammoth Energy in connection with Mammoth Energy’s activities in Puerto Rico following Hurricane Maria and the Company's secondary offering of Mammoth Energy common stock in June 2018. The complaint seeks unspecified damages, the payment of reasonable attorney fees and legal expenses and interest and to force Mammoth Energy and its board of directors to make specified corporate governance reforms.</span></div><div style="margin-bottom:12pt;text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">In October 2019, Kelsie Wagner, in her capacity as trustee of various trusts and on behalf of the trusts and other similarly situated royalty owners, filed an action against us in the District Court of Grady County, Oklahoma. The suit alleged that the Company underpaid royalty owners and seeks unspecified damages for violations of the Oklahoma Production Revenue Standards Act and fraud. This matter is settled in principal and a voluntary dismissal without prejudice is anticipated.</span></div><div style="margin-bottom:12pt;text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">In March 2020, Robert F. Woodley, individually and on behalf of all others similarly situated, filed a federal securities class action against the Company, David M. Wood, Keri Crowell and Quentin R. Hicks in the United States District Court for the Southern District of New York. The complaint alleges that the Company made materially false and misleading statements regarding the Company’s business and operations in violation of the federal securities laws and seeks unspecified damages, the payment of reasonable attorneys’ fees, expert fees and other costs, pre-judgment and post-judgment interest, and such other and further relief that may be deemed just and proper.</span></div><div style="text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:107%">In June 2020, Sam L. Carter, derivatively on behalf of the Company, filed an action against certain of our current and former executive officers and directors in the United States District Court for the District of Delaware. The complaint alleged that the defendants breached their fiduciary duties to the Company in connection with certain alleged materially false and misleading statements regarding our business and operations in violation of the federal securities laws. The complaint sought to recover unspecified damages from the defendants, the implementation of specified corporate governance reforms, reasonable attorneys’ and experts’ fees, costs and expenses, and such other relief as may be deemed just and proper. The complaint was voluntarily dismissed without prejudice on October 6, 2020.</span></div><div><span><br/></span></div><div style="text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:107%">The Company filed a lawsuit against Stingray Pressure Pumping LLC, a subsidiary of Mammoth Energy (“Stingray”), for breach of contract and to terminate the Master Services Agreement for pressure pumping services, effective as of October 1, 2014, as amended (the “Master Services Agreement”), between Stingray and the Company. In March 2020, Stingray filed a counterclaim against the Company in the Superior Court of the State of Delaware. The counterclaim alleges that the Company has breached the Master Services Agreement. The counterclaim seeks actual damages, and Stingray filed claims in the Chapter 11 proceedings totaling $43.4 million related to breach of contract damages, attorneys' fees and interest.</span></div><div><span><br/></span></div><div style="text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:107%">In April 2020, Bryon Lefort, individually and on behalf of similarly situated individuals, filed an action against the Company in the United States District Court for the Southern District of Ohio Eastern Division. The complaint alleges that the Company violated the Fair Labor Standards Act (“FLSA”), the Ohio Wage Act and the Ohio Prompt Pay Act by classifying the plaintiffs as independent contractors and paying them a daily rate with no overtime compensation for hours worked in excess of 40 hours per week. The complaint seeks to recover unpaid regular and overtime wages, liquidated damages in an amount equal </span></div><div><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:107%">to six of all unpaid overtime compensation, the payment of reasonable attorney fees and legal expenses and pre-judgment and post-judgment interest, and such other damages that may be owed to the workers.</span></div><div><span><br/></span></div><div style="text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:107%">In August 2020, Muskie filed an action against the Company in the Superior Court of the State of Delaware for breach of contract. The complaint alleges that the Company breached its obligation to purchase a certain amount of proppant sand each month or make designated shortfall payments under the Sand Supply Agreement, effective October 1, 2014, as amended (the “Sand Supply Agreement”), between Muskie and the Company, and seeks payment of unpaid shortfall payments, and Muskie filed a claim in the Chapter 11 proceedings for $3.4 million.</span></div><div><span><br/></span></div><div style="margin-bottom:12pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%">SEC Investigation</span></div><div style="text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">The SEC has commenced an investigation with respect to certain actions by former Company management, including alleged improper personal use of Company assets, and potential violations by former management and the Company of the Sarbanes-Oxley Act of 2002 in connection with such actions. On February 24, 2021, without admitting or denying any of findings contained in the order, Gulfport resolved the SEC investigation through an administrative order that Gulfport violated Sections 13(a), 13(b)(2)(A), 13(b)(2)(B) and 14(a) of the Exchange Act and Rules 12b-20, 13a-1, 14a-3 and 14a-9. Under the administrative order and pursuant to Section 21C of the Exchange Act, Gulfport agreed to cease and desist from committing or causing any violations and any future violations of Sections 13(a), 13(b)(2)(A), 13(b)(2)(B) and 14(a) of the Exchange Act and Rules 12b-20, 13a-1, 14a-3 and 14a-9 thereunder. Based on the company’s extensive cooperation and prompt remedial efforts, the SEC did not impose a monetary penalty.</span></div><div style="text-indent:18pt"><span><br/></span></div><div style="margin-bottom:12pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%">Business Operations</span></div><div style="margin-bottom:12pt;text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The Company is involved in various lawsuits and disputes incidental to its business operations, including commercial disputes, personal injury claims, royalty claims, property damage claims and contract actions. </span></div><div style="margin-bottom:12pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%">Environmental Contingencies</span></div><div style="margin-bottom:12pt;text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The nature of the oil and gas business carries with it certain environmental risks for Gulfport and its subsidiaries. They have implemented various policies, programs, procedures, training and audits to reduce and mitigate such environmental risks. They conduct periodic reviews, on a company-wide basis, to assess changes in their environmental risk profile. Environmental reserves are established for environmental liabilities for which economic losses are probable and reasonably estimable. The Company manages its exposure to environmental liabilities in acquisitions by using an evaluation process that seeks to identify pre-existing contamination or compliance concerns and address the potential liability. Depending on the extent of an identified environmental concern, they may, among other things, exclude a property from the transaction, require the seller to remediate the property to their satisfaction in an acquisition or agree to assume liability for the remediation of the property.</span></div><div style="margin-bottom:12pt;text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The Company received several Finding of Violation ("FOVs") from the USEPA alleging violations of the Clean Air Act in Ohio. The Company entered into a settlement with the Department of Justice and USEPA agreeing to pay $1.7 million and invest in improvements at 17 well pads. The settlement was filed with the U.S. District Court for the Southern District of Ohio in January 2020 and was fully paid in October 2020.</span></div><div style="margin-bottom:12pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%">Other Matters</span></div><div style="margin-bottom:12pt;text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Based on management’s current assessment, they are of the opinion that no pending or threatened lawsuit or dispute relating to its business operations is likely to have a material adverse effect on their future consolidated financial position, results of operations or cash flows. The final resolution of such matters could exceed amounts accrued, however, and actual results could differ materially from management’s estimates.</span></div><div style="margin-bottom:12pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%">Concentration of Credit Risk</span></div><div style="margin-bottom:12pt;text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Gulfport operates in the oil and natural gas industry principally in the states of Ohio and Oklahoma with sales to refineries, re-sellers such as marketers, and other end users. While certain of these customers are affected by periodic downturns in the economy in general or in their specific segment of the oil and gas industry, Gulfport believes that its level of credit-related losses due to such economic fluctuations has been immaterial and will continue to be immaterial to the Company’s results of operations in the long term.</span></div><div style="margin-bottom:12pt;text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The Company maintains cash balances at several banks. Accounts at each institution are insured by the Federal Deposit Insurance Corporation. At December 31, 2020, Gulfport held no cash in excess of insured limits in these banks.</span></div>During the year ended December 31, 2020, one customer accounted for approximately 12% of the Company's total sales. During the year ended December 31, 2019, one customer accounted for approximately 14% of the Company's total sales. During the year ended December 31, 2018, two customers accounted for approximately 17% and 10% of the Company's total sales. The Company does not believe that the loss of any of these customers would have a material adverse effect on its natural gas, oil and condensate and NGL sales as alternative customers are readily available.
CY2020	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	2600000	USD
CY2019	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	2900000	USD
CY2020	us-gaap	Loss Contingency New Claims Filed Number LossContingencyNewClaimsFiledNumber	2	claim
CY2020Q2	gpor	Loss Contingency Damages Sought Percentage Of Unpaid Overtime Compensation LossContingencyDamagesSoughtPercentageOfUnpaidOvertimeCompensation	0.06
CY2020Q1	us-gaap	Gain Loss Related To Litigation Settlement GainLossRelatedToLitigationSettlement	1700000	USD
CY2020Q1	gpor	Number Of Well Pad Improvements NumberOfWellPadImprovements	17	well_pad
CY2020Q4	us-gaap	Capitalized Costs Proved Properties CapitalizedCostsProvedProperties	9359866000	USD
CY2019Q4	us-gaap	Capitalized Costs Proved Properties CapitalizedCostsProvedProperties	8909069000	USD
CY2020Q4	us-gaap	Capitalized Costs Unproved Properties CapitalizedCostsUnprovedProperties	1457043000	USD
CY2019Q4	us-gaap	Capitalized Costs Unproved Properties CapitalizedCostsUnprovedProperties	1686666000	USD
CY2020Q4	us-gaap	Capitalized Costs Oil And Gas Producing Activities Gross CapitalizedCostsOilAndGasProducingActivitiesGross	10816909000	USD
CY2019Q4	us-gaap	Capitalized Costs Oil And Gas Producing Activities Gross CapitalizedCostsOilAndGasProducingActivitiesGross	10595735000	USD
CY2020Q4	us-gaap	Capitalized Costs Accumulated Depreciation Depletion Amortization And Valuation Allowance For Relating To Oil And Gas Producing Activities CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities	8778759000	USD
CY2019Q4	us-gaap	Capitalized Costs Accumulated Depreciation Depletion Amortization And Valuation Allowance For Relating To Oil And Gas Producing Activities CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities	7191957000	USD
CY2020Q4	us-gaap	Capitalized Costs Oil And Gas Producing Activities Net CapitalizedCostsOilAndGasProducingActivitiesNet	2038150000	USD
CY2019Q4	us-gaap	Capitalized Costs Oil And Gas Producing Activities Net CapitalizedCostsOilAndGasProducingActivitiesNet	3403778000	USD
CY2020	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties CostsIncurredAcquisitionOfOilAndGasProperties	15260000	USD
CY2019	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties CostsIncurredAcquisitionOfOilAndGasProperties	37598000	USD
CY2018	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties CostsIncurredAcquisitionOfOilAndGasProperties	119444000	USD
CY2020	us-gaap	Costs Incurred Development Costs CostsIncurredDevelopmentCosts	276622000	USD
CY2019	us-gaap	Costs Incurred Development Costs CostsIncurredDevelopmentCosts	594673000	USD
CY2018	us-gaap	Costs Incurred Development Costs CostsIncurredDevelopmentCosts	714269000	USD
CY2020	us-gaap	Costs Incurred Exploration Costs CostsIncurredExplorationCosts	0	USD
CY2019	us-gaap	Costs Incurred Exploration Costs CostsIncurredExplorationCosts	9762000	USD
CY2018	us-gaap	Costs Incurred Exploration Costs CostsIncurredExplorationCosts	22081000	USD
CY2020	gpor	Total Costs Incurred In Oil And Gas Properties Acquisition And Development Activities TotalCostsIncurredInOilAndGasPropertiesAcquisitionAndDevelopmentActivities	291882000	USD
CY2019	gpor	Total Costs Incurred In Oil And Gas Properties Acquisition And Development Activities TotalCostsIncurredInOilAndGasPropertiesAcquisitionAndDevelopmentActivities	642033000	USD
CY2018	gpor	Total Costs Incurred In Oil And Gas Properties Acquisition And Development Activities TotalCostsIncurredInOilAndGasPropertiesAcquisitionAndDevelopmentActivities	855794000	USD
CY2020	gpor	Capitalized General And Administrative Costs CapitalizedGeneralAndAdministrativeCosts	25000000.0	USD
CY2019	gpor	Capitalized General And Administrative Costs CapitalizedGeneralAndAdministrativeCosts	30100000	USD
CY2018	gpor	Capitalized General And Administrative Costs CapitalizedGeneralAndAdministrativeCosts	37700000	USD
CY2020	us-gaap	Results Of Operations Revenue From Oil And Gas Producing Activities ResultsOfOperationsRevenueFromOilAndGasProducingActivities	801251000	USD
CY2019	us-gaap	Results Of Operations Revenue From Oil And Gas Producing Activities ResultsOfOperationsRevenueFromOilAndGasProducingActivities	1354766000	USD
CY2018	us-gaap	Results Of Operations Revenue From Oil And Gas Producing Activities ResultsOfOperationsRevenueFromOilAndGasProducingActivities	1675180000	USD
CY2020	us-gaap	Results Of Operations Production Or Lifting Costs ResultsOfOperationsProductionOrLiftingCosts	537609000	USD
CY2019	us-gaap	Results Of Operations Production Or Lifting Costs ResultsOfOperationsProductionOrLiftingCosts	620412000	USD
CY2018	us-gaap	Results Of Operations Production Or Lifting Costs ResultsOfOperationsProductionOrLiftingCosts	611965000	USD
CY2020	us-gaap	Results Of Operations Depreciation Depletion And Amortization And Valuation Provisions ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions	229702000	USD
CY2019	us-gaap	Results Of Operations Depreciation Depletion And Amortization And Valuation Provisions ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions	539379000	USD
CY2018	us-gaap	Results Of Operations Depreciation Depletion And Amortization And Valuation Provisions ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions	476517000	USD
CY2020	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	1357099000	USD
CY2019	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	2039770000	USD
CY2018	gpor	Depletionper Mc Fof Gas Equivalent DepletionperMCFofGasEquivalent	0.96	usd_per_mcf
CY2018	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	0	USD
CY2020	us-gaap	Results Of Operations Income Tax Expense ResultsOfOperationsIncomeTaxExpense	7290000	USD
CY2019	us-gaap	Results Of Operations Income Tax Expense ResultsOfOperationsIncomeTaxExpense	-7563000	USD
CY2018	us-gaap	Results Of Operations Income Tax Expense ResultsOfOperationsIncomeTaxExpense	-68000	USD
CY2020	us-gaap	Results Of Operations Oil And Gas Producing Activities Net Income Excluding Corporate Overhead And Interest Costs ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts	-1330449000	USD
CY2019	us-gaap	Results Of Operations Oil And Gas Producing Activities Net Income Excluding Corporate Overhead And Interest Costs ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts	-1837232000	USD
CY2018	us-gaap	Results Of Operations Oil And Gas Producing Activities Net Income Excluding Corporate Overhead And Interest Costs ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts	586766000	USD
CY2020	gpor	Depletionper Mc Fof Gas Equivalent DepletionperMCFofGasEquivalent	0.61	usd_per_mcf
CY2019	gpor	Depletionper Mc Fof Gas Equivalent DepletionperMCFofGasEquivalent	1.08	usd_per_mcf
CY2017Q4	srt	Proved Developed And Undeveloped Reserves Net ProvedDevelopedAndUndevelopedReservesNet	5395000000	Bcf
CY2018	srt	Proved Developed And Undeveloped Reserves Purchases Of Minerals In Place ProvedDevelopedAndUndevelopedReservesPurchasesOfMineralsInPlace	0	Bcf
CY2018	srt	Proved Developed And Undeveloped Reserves Extensions Discoveries And Additions ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions	711000000	Bcf
CY2018	srt	Proved Developed And Undeveloped Reserves Sales Of Minerals In Place ProvedDevelopedAndUndevelopedReservesSalesOfMineralsInPlace	45000000	Bcf
CY2018	srt	Proved Developed And Undeveloped Reserves Revisions Of Previous Estimates Increase Decrease ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease	821000000	Bcf
CY2018	srt	Proved Developed And Undeveloped Reserves Production ProvedDevelopedAndUndevelopedReservesProduction	497000000	Bcf
CY2018Q4	srt	Proved Developed And Undeveloped Reserves Net ProvedDevelopedAndUndevelopedReservesNet	4743000000	Bcf
CY2019	srt	Proved Developed And Undeveloped Reserves Purchases Of Minerals In Place ProvedDevelopedAndUndevelopedReservesPurchasesOfMineralsInPlace	0	Bcf
CY2019	srt	Proved Developed And Undeveloped Reserves Extensions Discoveries And Additions ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions	1097000000	Bcf
CY2019	srt	Proved Developed And Undeveloped Reserves Sales Of Minerals In Place ProvedDevelopedAndUndevelopedReservesSalesOfMineralsInPlace	77000000	Bcf
CY2019	srt	Proved Developed And Undeveloped Reserves Revisions Of Previous Estimates Increase Decrease ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease	734000000	Bcf
CY2019	srt	Proved Developed And Undeveloped Reserves Production ProvedDevelopedAndUndevelopedReservesProduction	502000000	Bcf
CY2019Q4	srt	Proved Developed And Undeveloped Reserves Net ProvedDevelopedAndUndevelopedReservesNet	4528000000	Bcf
CY2020	srt	Proved Developed And Undeveloped Reserves Purchases Of Minerals In Place ProvedDevelopedAndUndevelopedReservesPurchasesOfMineralsInPlace	0	Bcf
CY2020	srt	Proved Developed And Undeveloped Reserves Extensions Discoveries And Additions ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions	240000000	Bcf
CY2020	srt	Proved Developed And Undeveloped Reserves Sales Of Minerals In Place ProvedDevelopedAndUndevelopedReservesSalesOfMineralsInPlace	75000000	Bcf
CY2020	srt	Proved Developed And Undeveloped Reserves Revisions Of Previous Estimates Increase Decrease ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease	1725000000	Bcf
CY2020	srt	Proved Developed And Undeveloped Reserves Production ProvedDevelopedAndUndevelopedReservesProduction	380000000	Bcf
CY2020Q4	srt	Proved Developed And Undeveloped Reserves Net ProvedDevelopedAndUndevelopedReservesNet	2588000000	Bcf
CY2018Q4	srt	Proved Developed Reserves Volume ProvedDevelopedReservesVolume	2115000000	Bcf
CY2019Q4	srt	Proved Developed Reserves Volume ProvedDevelopedReservesVolume	1984000000	Bcf
CY2020Q4	srt	Proved Developed Reserves Volume ProvedDevelopedReservesVolume	1527000000	Bcf
CY2018Q4	srt	Proved Undeveloped Reserve Volume ProvedUndevelopedReserveVolume	2628000000	Bcf
CY2019Q4	srt	Proved Undeveloped Reserve Volume ProvedUndevelopedReserveVolume	2544000000	Bcf
CY2020Q4	srt	Proved Undeveloped Reserve Volume ProvedUndevelopedReserveVolume	1061000000	Bcf
CY2020	srt	Proved Developed And Undeveloped Reserve Extension And Discovery Energy ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy	239.8	Bcfe
CY2019	srt	Proved Developed And Undeveloped Reserve Extension And Discovery Energy ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy	1.1	Bcfe
CY2018	srt	Proved Developed And Undeveloped Reserve Extension And Discovery Energy ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy	711.2	Bcfe
CY2020Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Cash Inflows FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows	4079000000	USD
CY2019Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Cash Inflows FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows	10451000000	USD
CY2018Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Cash Inflows FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows	14483000000	USD
CY2020Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Development Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts	652000000	USD
CY2019Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Development Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts	2058000000	USD
CY2018Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Development Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts	2438000000	USD
CY2020Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Income Tax Expense FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense	0	USD
CY2019Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Income Tax Expense FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense	0	USD
CY2020Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Production Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts	2325000000	USD
CY2019Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Production Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts	4513000000	USD
CY2018Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Production Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts	5068000000	USD
CY2020Q4	gpor	Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Production Taxes DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesFutureProductionTaxes	137000000	USD
CY2019Q4	gpor	Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Production Taxes DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesFutureProductionTaxes	333000000	USD
CY2018Q4	gpor	Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Production Taxes DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesFutureProductionTaxes	456000000	USD
CY2018Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Income Tax Expense FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense	943000000	USD
CY2020Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Net Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows	965000000	USD
CY2019Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Net Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows	3547000000	USD
CY2018Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Net Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows	5578000000	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	425000000	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	1844000000	USD
CY2018Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Ten Percent Annual Discount For Estimated Timing Of Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows	2596000000	USD
CY2020Q4	srt	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	540000000	USD
CY2019Q4	srt	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	1703000000	USD
CY2018Q4	srt	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	2982000000	USD
CY2020	srt	Sales And Transfers Of Oil And Gas Produced Net Of Production Costs SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts	264000000	USD
CY2019	srt	Sales And Transfers Of Oil And Gas Produced Net Of Production Costs SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts	734000000	USD
CY2018	srt	Sales And Transfers Of Oil And Gas Produced Net Of Production Costs SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts	1063000000	USD
CY2020	gpor	Net Changes In Prices Production Costs And Development NetChangesInPricesProductionCostsAndDevelopment	-954000000	USD
CY2019	gpor	Net Changes In Prices Production Costs And Development NetChangesInPricesProductionCostsAndDevelopment	-1372000000	USD
CY2018	gpor	Net Changes In Prices Production Costs And Development NetChangesInPricesProductionCostsAndDevelopment	591000000	USD
CY2020	srt	Increase Due To Purchases Of Minerals In Place IncreaseDueToPurchasesOfMineralsInPlace	0	USD
CY2019	srt	Increase Due To Purchases Of Minerals In Place IncreaseDueToPurchasesOfMineralsInPlace	0	USD
CY2018	srt	Increase Due To Purchases Of Minerals In Place IncreaseDueToPurchasesOfMineralsInPlace	0	USD
CY2020	srt	Extensions Discoveries Additions And Improved Recovery Less Related Costs ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts	38000000	USD
CY2019	srt	Extensions Discoveries Additions And Improved Recovery Less Related Costs ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts	388000000	USD
CY2018	srt	Extensions Discoveries Additions And Improved Recovery Less Related Costs ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts	519000000	USD
CY2020	srt	Previously Estimated Development Costs Incurred PreviouslyEstimatedDevelopmentCostsIncurred	215000000	USD
CY2019	srt	Previously Estimated Development Costs Incurred PreviouslyEstimatedDevelopmentCostsIncurred	406000000	USD
CY2018	srt	Previously Estimated Development Costs Incurred PreviouslyEstimatedDevelopmentCostsIncurred	402000000	USD
CY2020	srt	Revisions Of Previous Quantity Estimates RevisionsOfPreviousQuantityEstimates	-255000000	USD
CY2019	srt	Revisions Of Previous Quantity Estimates RevisionsOfPreviousQuantityEstimates	-321000000	USD
CY2018	srt	Revisions Of Previous Quantity Estimates RevisionsOfPreviousQuantityEstimates	-357000000	USD
CY2020	srt	Decrease Due To Sales Of Minerals In Place DecreaseDueToSalesOfMineralsInPlace	6000000	USD
CY2019	srt	Decrease Due To Sales Of Minerals In Place DecreaseDueToSalesOfMineralsInPlace	49000000	USD
CY2018	srt	Decrease Due To Sales Of Minerals In Place DecreaseDueToSalesOfMineralsInPlace	26000000	USD
CY2020	srt	Standardized Measure Of Discounted Future Net Cash Flow Relating To Proved Oil And Gas Reserves Accretion Of Discount StandardizedMeasureOfDiscountedFutureNetCashFlowRelatingToProvedOilAndGasReservesAccretionOfDiscount	170000000	USD
CY2019	srt	Standardized Measure Of Discounted Future Net Cash Flow Relating To Proved Oil And Gas Reserves Accretion Of Discount StandardizedMeasureOfDiscountedFutureNetCashFlowRelatingToProvedOilAndGasReservesAccretionOfDiscount	298000000	USD
CY2018	srt	Standardized Measure Of Discounted Future Net Cash Flow Relating To Proved Oil And Gas Reserves Accretion Of Discount StandardizedMeasureOfDiscountedFutureNetCashFlowRelatingToProvedOilAndGasReservesAccretionOfDiscount	264000000	USD
CY2020	srt	Increase Decrease In Future Income Tax Expense Estimates On Future Cash Flows Related To Proved Oil And Gas Reserves IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves	0	USD
CY2019	srt	Increase Decrease In Future Income Tax Expense Estimates On Future Cash Flows Related To Proved Oil And Gas Reserves IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves	425000000	USD
CY2018	srt	Increase Decrease In Future Income Tax Expense Estimates On Future Cash Flows Related To Proved Oil And Gas Reserves IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves	-185000000	USD
CY2020	gpor	Change In Production Rates And Other ChangeInProductionRatesAndOther	-109000000	USD
CY2019	gpor	Change In Production Rates And Other ChangeInProductionRatesAndOther	-319000000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	0	USD
CY2020Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	0	USD
CY2018	gpor	Change In Production Rates And Other ChangeInProductionRatesAndOther	194000000	USD
CY2020	srt	Standardized Measure Of Discounted Future Net Cash Flow Of Proved Oil And Gas Reserves Period Increase Decrease StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesPeriodIncreaseDecrease	-1165000000	USD
CY2019	srt	Standardized Measure Of Discounted Future Net Cash Flow Of Proved Oil And Gas Reserves Period Increase Decrease StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesPeriodIncreaseDecrease	-1278000000	USD
CY2018	srt	Standardized Measure Of Discounted Future Net Cash Flow Of Proved Oil And Gas Reserves Period Increase Decrease StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesPeriodIncreaseDecrease	339000000	USD
CY2020Q1	us-gaap	Revenues Revenues	299338000	USD
CY2020Q2	us-gaap	Revenues Revenues	186301000	USD
CY2020Q3	us-gaap	Revenues Revenues	136176000	USD
CY2020Q4	us-gaap	Revenues Revenues	244727000	USD
CY2020Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	-480087000	USD
CY2020Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	-555750000	USD
CY2020Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	-346400000	USD
CY2020Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	19632000	USD
CY2020Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7290000	USD
CY2020Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	0	USD
CY2020Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-1.03
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	-517538000	USD
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	-561068000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	-380963000	USD
CY2020Q4	us-gaap	Net Income Loss NetIncomeLoss	-165564000	USD
CY2020Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-3.24
CY2020Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-3.51
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-2.37
CY2020Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-3.24
CY2020Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-3.51
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-2.37
CY2020Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-1.03
CY2019Q1	us-gaap	Revenues Revenues	372462000	USD
CY2019Q2	us-gaap	Revenues Revenues	512451000	USD
CY2019Q3	us-gaap	Revenues Revenues	341745000	USD
CY2019Q4	us-gaap	Revenues Revenues	336468000	USD
CY2019Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	93011000	USD
CY2019Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	218456000	USD
CY2019Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	-570955000	USD
CY2019Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	-1444205000	USD
CY2019Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	0	USD
CY2019Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-179331000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-144047000	USD
CY2019Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	315815000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	62242000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	234956000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	-484802000	USD
CY2019Q4	us-gaap	Net Income Loss NetIncomeLoss	-1814754000	USD
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.38
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.47
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-3.04
CY2019Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-11.36
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.38
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.47
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-3.04
CY2019Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-11.36

Files In Submission

Name	View Source	Status
0001628280-21-004026-index-headers.html	Edgar Link	pending
0001628280-21-004026-index.html	Edgar Link	pending
0001628280-21-004026.txt	Edgar Link	pending
0001628280-21-004026-xbrl.zip	Edgar Link	pending
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Financial_Report.xlsx	Edgar Link	pending
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$GPOR
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2020 Q4 Form 10-K Financial Statement

#000162828021004026 Filed on March 05, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$GPOR GULFPORT ENERGY CORP Stock $gpor

2020 Q4 Form 10-K Financial Statement

#000162828021004026 Filed on March 05, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$GPOR
GULFPORT ENERGY CORP Stock $gpor