$GPOR
GULFPORT ENERGY CORP Stock $gpor

$gpor Overview Financials Valuation SEC Filings Company Website

2019 Q4 Form 10-K Financial Statement

#000162828020002453 Filed on February 27, 2020

Income Statement

Concept	2019 Q4	2019	2018 Q4
Revenue	$336.5M	$1.563B	$416.0M
YoY Change	-19.11%	0.74%	4.55%
Cost Of Revenue	$24.32M	$508.8M	$37.12M
YoY Change	-34.48%	4.52%	37.98%
Gross Profit	$256.9M	$1.054B	$378.8M
YoY Change	-32.18%	-0.99%	2.11%
Gross Profit Margin	76.37%	67.45%	91.08%
Selling, General & Admin	$79.49M	$554.4M	$82.68M
YoY Change	-3.86%	3.83%	-5.83%
% of Gross Profit	30.94%	52.58%	21.83%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$143.5M	$550.1M	$133.8M
YoY Change	7.2%	13.04%	21.98%
% of Gross Profit	55.83%	52.18%	35.32%
Operating Expenses	$223.7M	$1.108B	$217.6M
YoY Change	2.83%	15.13%	9.93%
Operating Profit	-$1.444B	-$1.704B	$156.5M
YoY Change	-1022.93%	-527.03%	-9.56%
Interest Expense	-$84.30M	$141.8M	-$26.22M
YoY Change	221.54%	-0.09%	48.95%
% of Operating Profit			-16.75%
Other Income/Expense, Net	$32.00K	-$306.2M	-$1.057M
YoY Change	-103.03%	-1071.17%	-628.5%
Pretax Income	-$1.499B	-$2.010B	$134.0M
YoY Change	-1218.6%	-566.89%	-13.88%
Income Tax	$315.8M	-$7.563M	$0.00
% Of Pretax Income			0.0%
Net Earnings	-$1.815B	-$2.002B	$134.0M
YoY Change	-1454.28%	-565.06%	-14.39%
Net Earnings / Revenue	-539.35%	-128.1%	32.22%
Basic Earnings Per Share	-$11.36	-$12.49	$0.78
Diluted Earnings Per Share	-$11.36	-$12.49	$0.78
COMMON SHARES
Basic Shares Outstanding	159.7M shares	160.3M shares	173.3M shares
Diluted Shares Outstanding		160.3M shares

Balance Sheet

Concept	2019 Q4	2019	2018 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$6.060M	$6.060M	$52.30M
YoY Change	-88.41%	-88.41%	-47.49%
Cash & Equivalents	$6.060M	$6.060M	$52.30M
Short-Term Investments
Other Short-Term Assets	$130.6M	$130.6M	$31.37M
YoY Change	316.44%	316.44%	-62.52%
Inventory
Prepaid Expenses
Receivables	$121.2M	$169.2M	$210.2M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$305.9M	$305.9M	$316.4M
YoY Change	-3.31%	-3.31%	-13.45%
LONG-TERM ASSETS
Property, Plant & Equipment	$3.464B	$3.521B	$5.479B
YoY Change	-36.79%	-35.74%	7.39%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$32.04M	$32.04M	$236.1M
YoY Change	-86.43%	-86.43%	-21.84%
Other Assets	$15.54M	$23.67M	$13.80M
YoY Change	12.58%	23.6%	-30.34%
Total Long-Term Assets	$3.577B	$3.577B	$5.735B
YoY Change	-37.63%	-37.63%	5.37%
TOTAL ASSETS
Total Short-Term Assets	$305.9M	$305.9M	$316.4M
Total Long-Term Assets	$3.577B	$3.577B	$5.735B
Total Assets	$3.883B	$3.883B	$6.051B
YoY Change	-35.83%	-35.83%	4.19%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$415.2M	$415.2M	$518.4M
YoY Change	-19.9%	-19.9%	-6.36%
Accrued Expenses	$35.05M	$35.05M	$0.00
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$631.0K	$631.0K	$651.0K
YoY Change	-3.07%	-3.07%	4.66%
Total Short-Term Liabilities	$451.2M	$451.2M	$539.4M
YoY Change	-16.36%	-16.36%	-8.09%
LONG-TERM LIABILITIES
Long-Term Debt	$1.978B	$1.978B	$2.087B
YoY Change	-5.21%	-5.21%	2.38%
Other Long-Term Liabilities	$135.9M	$135.9M	$0.00
YoY Change		44.64%	-100.0%
Total Long-Term Liabilities	$2.117B	$2.114B	$2.087B
YoY Change	1.45%	-3.06%	2.23%
TOTAL LIABILITIES
Total Short-Term Liabilities	$451.2M	$451.2M	$539.4M
Total Long-Term Liabilities	$2.117B	$2.114B	$2.087B
Total Liabilities	$2.568B	$2.568B	$2.723B
YoY Change	-5.69%	-5.69%	0.63%
SHAREHOLDERS EQUITY
Retained Earnings	-$2.848B		-$845.4M
YoY Change	236.86%		-33.74%
Common Stock	$1.597M		$1.630M
YoY Change	-2.02%		-10.98%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$1.315B	$1.315B	$3.328B
YoY Change
Total Liabilities & Shareholders Equity	$3.883B	$3.883B	$6.051B
YoY Change	-35.83%	-35.83%	4.19%

Cashflow Statement

Concept	2019 Q4	2019	2018 Q4
OPERATING ACTIVITIES
Net Income	-$1.815B	-$2.002B	$134.0M
YoY Change	-1454.28%	-565.06%	-14.39%
Depreciation, Depletion And Amortization	$143.5M	$550.1M	$133.8M
YoY Change	7.2%	13.04%	21.98%
Cash From Operating Activities	$106.6M	$724.0M	$155.5M
YoY Change	-31.41%	-7.92%	-17.39%
INVESTING ACTIVITIES
Capital Expenditures	-$73.85M	-$725.1M	-$122.7M
YoY Change	-39.82%	-20.05%	-57.27%
Acquisitions
YoY Change
Other Investing Activities	$37.73M	$3.241M	$427.0K
YoY Change	8735.13%	-65.49%	-107.76%
Cash From Investing Activities	-$36.12M	-$674.8M	-$122.3M
YoY Change	-70.46%	-0.31%	-58.22%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net		$30.00M
YoY Change		-85.02%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-74.58M	-$95.46M	-105.5M
YoY Change	-29.28%	-39.06%	-233.66%
NET CHANGE
Cash From Operating Activities	106.6M	$724.0M	155.5M
Cash From Investing Activities	-36.12M	-$674.8M	-122.3M
Cash From Financing Activities	-74.58M	-$95.46M	-105.5M
Net Change In Cash	-4.064M	-$46.24M	-72.27M
YoY Change	-94.38%	-2.16%	182.32%
FREE CASH FLOW
Cash From Operating Activities	$106.6M	$724.0M	$155.5M
Capital Expenditures	-$73.85M	-$725.1M	-$122.7M
Free Cash Flow	$180.5M	$1.449B	$278.2M
YoY Change	-35.12%	-14.42%	-41.48%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2019Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	200000000	shares
CY2019	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2019	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2019	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2019
CY2019	dei	Entity Central Index Key EntityCentralIndexKey	0000874499
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CY2019Q4	us-gaap	Temporary Equity Shares Authorized TemporaryEquitySharesAuthorized	30000	shares
CY2019	dei	Document Type DocumentType	10-K
CY2019	dei	Document Annual Report DocumentAnnualReport	true
CY2019	dei	Document Period End Date DocumentPeriodEndDate	2019-12-31
CY2019	dei	Document Transition Report DocumentTransitionReport	false
CY2019	dei	Entity File Number EntityFileNumber	000-19514
CY2019	dei	Entity Registrant Name EntityRegistrantName	Gulfport Energy Corp
CY2019	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2019	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	73-1521290
CY2019	dei	Entity Address Address Line1 EntityAddressAddressLine1	3001 Quail Springs Parkway
CY2019	dei	Entity Address City Or Town EntityAddressCityOrTown	Oklahoma City,
CY2019	dei	Entity Address State Or Province EntityAddressStateOrProvince	OK
CY2019	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	73134
CY2019	dei	City Area Code CityAreaCode	405
CY2019	dei	Local Phone Number LocalPhoneNumber	252-4600
CY2019	dei	Security12b Title Security12bTitle	Common Stock, par value $0.01 per share
CY2019	dei	Trading Symbol TradingSymbol	GPOR
CY2019	dei	Security Exchange Name SecurityExchangeName	NASDAQ
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CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	-1703693000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	398959000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	555781000	USD
CY2019	us-gaap	Interest Expense InterestExpense	141786000	USD
CY2018	us-gaap	Interest Expense InterestExpense	141912000	USD
CY2017	us-gaap	Interest Expense InterestExpense	115613000	USD
CY2019	us-gaap	Investment Income Interest InvestmentIncomeInterest	801000	USD
CY2018	us-gaap	Investment Income Interest InvestmentIncomeInterest	314000	USD
CY2017	us-gaap	Investment Income Interest InvestmentIncomeInterest	1009000	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	48630000	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2017	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	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
CY2017	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	12523000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-210148000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	49904000	USD
CY2017	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-17780000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-3725000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-1542000	USD
CY2017	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	1041000	USD
CY2019	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-306228000	USD
CY2018	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	31532000	USD
CY2017	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-118820000	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
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	436961000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-7563000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-69000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1809000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-2002358000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	430560000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	435152000	USD
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-12.49
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.46
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.42
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-12.49
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.45
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.41
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
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	179834146	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
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	180253024	shares
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-2002358000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	430560000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	435152000	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
CY2017	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	12519000	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
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	12519000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-1993165000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	415073000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	447671000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	0	USD
CY2016Q4	us-gaap	Stockholders Equity StockholdersEquity	2183892000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	435152000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	12519000	USD
CY2017	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	10615000	USD
CY2017	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	459436000	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
CY2017	gpor	Deferred Income Tax Expense Benefit Including Discontinued Operations DeferredIncomeTaxExpenseBenefitIncludingDiscontinuedOperations	1690000	USD
CY2019	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	6328000	USD
CY2017	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	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	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
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-2002358000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	430560000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	435152000	USD
CY2019	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	3939000	USD
CY2018	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	4119000	USD
CY2017	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	1611000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	550108000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	486664000	USD
CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	364629000	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
CY2017	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	0	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	4911000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	6799000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	6369000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-210289000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	49625000	USD
CY2017	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-18513000	USD
CY2019	gpor	Gain Losson Extinguishmentof Debt Net GainLossonExtinguishmentofDebtNet	48630000	USD
CY2018	gpor	Gain Losson Extinguishmentof Debt Net GainLossonExtinguishmentofDebtNet	0	USD
CY2017	gpor	Gain Losson Extinguishmentof Debt Net GainLossonExtinguishmentofDebtNet	0	USD
CY2019	us-gaap	Unrealized Gain Loss On Derivatives And Commodity Contracts UnrealizedGainLossOnDerivativesAndCommodityContracts	85230000	USD
CY2018	us-gaap	Unrealized Gain Loss On Derivatives And Commodity Contracts UnrealizedGainLossOnDerivativesAndCommodityContracts	-65051000	USD
CY2017	us-gaap	Unrealized Gain Loss On Derivatives And Commodity Contracts UnrealizedGainLossOnDerivativesAndCommodityContracts	188802000	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
CY2018	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	6121000	USD
CY2017	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	5011000	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
CY2017	gpor	Equity Method Investment Realized Gain Losson Disposaland Other Assets EquityMethodInvestmentRealizedGainLossonDisposalandOtherAssets	12523000	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
CY2017	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	0	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-88990000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	63427000	USD
CY2017	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	35879000	USD
CY2019	gpor	Increase Decreasein Accounts Receivable Joint Operationsand Other IncreaseDecreaseinAccountsReceivableJointOperationsandOther	25478000	USD
CY2018	gpor	Increase Decreasein Accounts Receivable Joint Operationsand Other IncreaseDecreaseinAccountsReceivableJointOperationsandOther	-12943000	USD
CY2017	gpor	Increase Decreasein Accounts Receivable Joint Operationsand Other IncreaseDecreaseinAccountsReceivableJointOperationsandOther	9573000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable Related Parties IncreaseDecreaseInAccountsReceivableRelatedParties	0	USD
CY2017	us-gaap	Increase Decrease In Accounts Receivable Related Parties IncreaseDecreaseInAccountsReceivableRelatedParties	-16000	USD
CY2019	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	-5586000	USD
CY2018	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	5695000	USD
CY2017	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	1777000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-915000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-4066000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	7866000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-19548000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	9768000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	106375000	USD
CY2019	gpor	Increase Decrease In Asset Retirement Obligation IncreaseDecreaseInAssetRetirementObligation	-273000	USD
CY2018	gpor	Increase Decrease In Asset Retirement Obligation IncreaseDecreaseInAssetRetirementObligation	-719000	USD
CY2017	gpor	Increase Decrease In Asset Retirement Obligation IncreaseDecreaseInAssetRetirementObligation	-3057000	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
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	679889000	USD
CY2019	us-gaap	Increase Decrease Of Restricted Investments IncreaseDecreaseOfRestrictedInvestments	0	USD
CY2018	us-gaap	Increase Decrease Of Restricted Investments IncreaseDecreaseOfRestrictedInvestments	0	USD
CY2017	us-gaap	Increase Decrease Of Restricted Investments IncreaseDecreaseOfRestrictedInvestments	-8000	USD
CY2019	us-gaap	Payments To Acquire Other Property Plant And Equipment PaymentsToAcquireOtherPropertyPlantAndEquipment	5021000	USD
CY2018	us-gaap	Payments To Acquire Other Property Plant And Equipment PaymentsToAcquireOtherPropertyPlantAndEquipment	7870000	USD
CY2017	us-gaap	Payments To Acquire Other Property Plant And Equipment PaymentsToAcquireOtherPropertyPlantAndEquipment	19372000	USD
CY2019	gpor	Paymentto Acquire Oiland Gas Propertyand Equipment Net PaymenttoAcquireOilandGasPropertyandEquipmentNet	0	USD
CY2018	gpor	Paymentto Acquire Oiland Gas Propertyand Equipment Net PaymenttoAcquireOilandGasPropertyandEquipmentNet	0	USD
CY2017	gpor	Paymentto Acquire Oiland Gas Propertyand Equipment Net PaymenttoAcquireOilandGasPropertyandEquipmentNet	1348657000	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
CY2017	us-gaap	Payments To Acquire Oil And Gas Property PaymentsToAcquireOilAndGasProperty	1064678000	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
CY2017	us-gaap	Proceeds From Sale Of Oil And Gas Property And Equipment ProceedsFromSaleOfOilAndGasPropertyAndEquipment	4866000	USD
CY2019	us-gaap	Proceeds From Sale Of Other Property Plant And Equipment ProceedsFromSaleOfOtherPropertyPlantAndEquipment	267000	USD
CY2018	us-gaap	Proceeds From Sale Of Other Property Plant And Equipment ProceedsFromSaleOfOtherPropertyPlantAndEquipment	351000	USD
CY2017	us-gaap	Proceeds From Sale Of Other Property Plant And Equipment ProceedsFromSaleOfOtherPropertyPlantAndEquipment	1569000	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
CY2017	us-gaap	Proceeds From Sale Of Equity Method Investments ProceedsFromSaleOfEquityMethodInvestments	0	USD
CY2019	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	432000	USD
CY2018	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	2319000	USD
CY2017	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	55280000	USD
CY2019	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	1945000	USD
CY2018	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	446000	USD
CY2017	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	7376000	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
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2474168000	USD
CY2019	us-gaap	Repayments Of Debt RepaymentsOfDebt	877697000	USD
CY2018	us-gaap	Repayments Of Debt RepaymentsOfDebt	220575000	USD
CY2017	us-gaap	Repayments Of Debt RepaymentsOfDebt	365276000	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
CY2017	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	365000000	USD
CY2019	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	0	USD
CY2018	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	0	USD
CY2017	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	450000000	USD
CY2019	us-gaap	Repayments Of Senior Debt RepaymentsOfSeniorDebt	138786000	USD
CY2018	us-gaap	Repayments Of Senior Debt RepaymentsOfSeniorDebt	0	USD
CY2017	us-gaap	Repayments Of Senior Debt RepaymentsOfSeniorDebt	0	USD
CY2019	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	0	USD
CY2018	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	0	USD
CY2017	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	2951000	USD
CY2019	us-gaap	Payments Of Loan Costs PaymentsOfLoanCosts	288000	USD
CY2018	us-gaap	Payments Of Loan Costs PaymentsOfLoanCosts	831000	USD
CY2017	us-gaap	Payments Of Loan Costs PaymentsOfLoanCosts	14350000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	30688000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	432961000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	200251000	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2017	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	-5364000	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
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
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-1361318000	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
CY2016Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1460875000	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
CY2019	us-gaap	Interest Paid Net InterestPaidNet	142664000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	132995000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	107548000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-1794000	USD
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-1105000	USD
CY2019	gpor	Capitalized Stock Based Compensation CapitalizedStockBasedCompensation	5766000	USD
CY2018	gpor	Capitalized Stock Based Compensation CapitalizedStockBasedCompensation	4533000	USD
CY2017	gpor	Capitalized Stock Based Compensation CapitalizedStockBasedCompensation	4246000	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
CY2017	us-gaap	Asset Retirement Obligation Period Increase Decrease AssetRetirementObligationPeriodIncreaseDecrease	42270000	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
CY2017	gpor	Asset Retirement Obligation Removed Due To Divestiture AssetRetirementObligationRemovedDueToDivestiture	0	USD
CY2019	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	3372000	USD
CY2018	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	4470000	USD
CY2017	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	9470000	USD
CY2019	gpor	Noncashor Part Noncash Acquisition Contingent Consideration NoncashorPartNoncashAcquisitionContingentConsideration	-1137000	USD
CY2018	gpor	Noncashor Part Noncash Acquisition Contingent Consideration NoncashorPartNoncashAcquisitionContingentConsideration	0	USD
CY2017	gpor	Noncashor Part Noncash Acquisition Contingent Consideration NoncashorPartNoncashAcquisitionContingentConsideration	0	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
CY2017	gpor	Foreign Currency Translation Gain Loss On Investment In Equity Method Investment ForeignCurrencyTranslationGainLossOnInvestmentInEquityMethodInvestment	12519000	USD
CY2019	gpor	Accounts Receivable Collection Period AccountsReceivableCollectionPeriod	P30D
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	0	USD
CY2019	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	2000000000.0	USD
CY2019	gpor	Conversion Ratio Gas To Barrels Of Oil ConversionRatioGasToBarrelsOfOil	6
CY2019Q4	us-gaap	Capitalized Costs Of Unproved Properties Excluded From Amortization Cumulative CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative	1700000000	USD
CY2018Q4	us-gaap	Capitalized Costs Of Unproved Properties Excluded From Amortization Cumulative CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative	2900000000	USD
CY2016Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-51709000	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
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	USD
CY2019	gpor	Accounts Receivable Collection Period AccountsReceivableCollectionPeriod	P30D
CY2018	us-gaap	Equity Method Investment Other Than Temporary Impairment EquityMethodInvestmentOtherThanTemporaryImpairment	0	USD
CY2019	us-gaap	Use Of Estimates UseOfEstimates	<div style="line-height:120%;padding-bottom:16px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-style:italic;">Use of Estimates</span></div><div style="line-height:120%;padding-bottom:16px;text-indent:24px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">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>
CY2019	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style="line-height:120%;padding-bottom:16px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-style:italic;">Reclassification</span></div>Certain reclassifications have been made to prior period financial statements and related disclosures to conform to current period presentation. These reclassifications have no impact on previous reported total assets, total liabilities, net (loss) income or total operating cash flows.
CY2019Q3	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	9200000	USD
CY2019Q3	gpor	Disposal Group Including Discontinued Operation Contingent Payment Period DisposalGroupIncludingDiscontinuedOperationContingentPaymentPeriod	P2Y
CY2019	gpor	Asset Retirement Obligation Liabilities Removed Due To Divestitures AssetRetirementObligationLiabilitiesRemovedDueToDivestitures	30000000.0	USD
CY2019	us-gaap	Proceeds From Sale Of Intangible Assets ProceedsFromSaleOfIntangibleAssets	7000000.0	USD
CY2019Q4	us-gaap	Oil And Gas Property Full Cost Method Gross OilAndGasPropertyFullCostMethodGross	10595735000	USD
CY2018Q4	us-gaap	Oil And Gas Property Full Cost Method Gross OilAndGasPropertyFullCostMethodGross	10026836000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	91198000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	87146000	USD
CY2019Q4	us-gaap	Land Land	5521000	USD
CY2018Q4	us-gaap	Land Land	5521000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	10692454000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	10119503000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	7228660000	USD
CY2018Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	4640098000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	3463794000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	5479405000	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
CY2019	gpor	Capitalized Costsof Unproved Properties Period Cost CapitalizedCostsofUnprovedPropertiesPeriodCost	30100000	USD
CY2018	gpor	Capitalized Costsof Unproved Properties Period Cost CapitalizedCostsofUnprovedPropertiesPeriodCost	37700000	USD
CY2017	gpor	Capitalized Costsof Unproved Properties Period Cost CapitalizedCostsofUnprovedPropertiesPeriodCost	35700000	USD
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
CY2017	gpor	Depletionper Mc Fof Gas Equivalent DepletionperMCFofGasEquivalent	0.90	usd_per_mcf
CY2019	us-gaap	Acquisition Costs AcquisitionCosts	9089000	USD
CY2018	us-gaap	Acquisition Costs AcquisitionCosts	98870000	USD
CY2017	us-gaap	Acquisition Costs AcquisitionCosts	756963000	USD
CY2016	us-gaap	Acquisition Costs AcquisitionCosts	806982000	USD
CY2019Q4	us-gaap	Acquisition Costs Cumulative AcquisitionCostsCumulative	1671904000	USD
CY2019	us-gaap	Exploration Costs ExplorationCosts	259000	USD
CY2018	us-gaap	Exploration Costs ExplorationCosts	0	USD
CY2017	us-gaap	Exploration Costs ExplorationCosts	0	USD
CY2016	us-gaap	Exploration Costs ExplorationCosts	0	USD
CY2019Q4	us-gaap	Exploration Costs Cumulative ExplorationCostsCumulative	259000	USD
CY2019	us-gaap	Development Costs DevelopmentCosts	1213000	USD
CY2018	us-gaap	Development Costs DevelopmentCosts	548000	USD
CY2017	us-gaap	Development Costs DevelopmentCosts	869000	USD
CY2016	us-gaap	Development Costs DevelopmentCosts	10325000	USD
CY2019Q4	us-gaap	Development Costs Cumulative DevelopmentCostsCumulative	12955000	USD
CY2019	gpor	Interest Cost Capitalized Not Subjectto Amortization InterestCostCapitalizedNotSubjecttoAmortization	888000	USD
CY2018	gpor	Interest Cost Capitalized Not Subjectto Amortization InterestCostCapitalizedNotSubjecttoAmortization	413000	USD
CY2017	gpor	Interest Cost Capitalized Not Subjectto Amortization InterestCostCapitalizedNotSubjecttoAmortization	247000	USD
CY2016	gpor	Interest Cost Capitalized Not Subjectto Amortization InterestCostCapitalizedNotSubjecttoAmortization	0	USD
CY2019Q4	us-gaap	Accumulated Capitalized Interest Costs AccumulatedCapitalizedInterestCosts	1548000	USD
CY2019	us-gaap	Capitalized Costs Of Unproved Properties Excluded From Amortization CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization	11449000	USD
CY2018	us-gaap	Capitalized Costs Of Unproved Properties Excluded From Amortization CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization	99831000	USD
CY2017	us-gaap	Capitalized Costs Of Unproved Properties Excluded From Amortization CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization	758079000	USD
CY2016	us-gaap	Capitalized Costs Of Unproved Properties Excluded From Amortization CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization	817307000	USD
CY2019Q4	us-gaap	Capitalized Costs Of Unproved Properties Excluded From Amortization Cumulative CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative	1686666000	USD
CY2019Q4	us-gaap	Capitalized Costs Of Unproved Properties Excluded From Amortization Cumulative CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative	1686666000	USD
CY2018Q4	us-gaap	Capitalized Costs Of Unproved Properties Excluded From Amortization Cumulative CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative	2900000000	USD
CY2019	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	5935000	USD
CY2018Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	79952000	USD
CY2017Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	75100000	USD
CY2018	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	1827000	USD
CY2019	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	273000	USD
CY2018	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	719000	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
CY2019	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	3939000	USD
CY2018	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	4119000	USD
CY2019	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	948000	USD
CY2018	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	-375000	USD
CY2019Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	60355000	USD
CY2018Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	79952000	USD
CY2019Q4	us-gaap	Equity Method Investments EquityMethodInvestments	32044000	USD
CY2018Q4	us-gaap	Equity Method Investments EquityMethodInvestments	236121000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-210148000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	49904000	USD
CY2017	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-17780000	USD
CY2019Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Assets EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets	421326000	USD
CY2018Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Assets EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets	471733000	USD
CY2019Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Assets EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets	1260075000	USD
CY2018Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Assets EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets	1302488000	USD
CY2019Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Liabilities EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities	132569000	USD
CY2018Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Liabilities EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities	239975000	USD
CY2019Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Liabilities EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities	163241000	USD
CY2018Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Liabilities EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities	94575000	USD
CY2019	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	625012000	USD
CY2018	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	1729778000	USD
CY2017	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	755374000	USD
CY2019	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	-76523000	USD
CY2018	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	253451000	USD
CY2017	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	-37102000	USD
CY2019Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	23751000	USD
CY2018Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	30733000	USD
CY2019Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	631000	USD
CY2018Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	651000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1978020000	USD
CY2018Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	2086765000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	631000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	120663000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	694000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	330194000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	604186000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	946034000	USD
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	2002402000	USD
CY2019Q3	gpor	Debt Instrument Repurchase Amount Authorized Amount DebtInstrumentRepurchaseAmountAuthorizedAmount	100000000	USD
CY2019Q4	us-gaap	Debt Instrument Repurchased Face Amount DebtInstrumentRepurchasedFaceAmount	200000000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	142664000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	132995000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	107548000	USD
CY2019	gpor	Debt Instrument Increase Decrease Accrued Interest DebtInstrumentIncreaseDecreaseAccruedInterest	-3834000	USD
CY2018	gpor	Debt Instrument Increase Decrease Accrued Interest DebtInstrumentIncreaseDecreaseAccruedInterest	7266000	USD
CY2017	gpor	Debt Instrument Increase Decrease Accrued Interest DebtInstrumentIncreaseDecreaseAccruedInterest	12524000	USD
CY2019	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	3372000	USD
CY2018	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	4470000	USD
CY2017	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	9470000	USD
CY2019	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	6328000	USD
CY2018	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	6121000	USD
CY2017	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	5011000	USD
CY2019	us-gaap	Interest Expense InterestExpense	141786000	USD
CY2018	us-gaap	Interest Expense InterestExpense	141912000	USD
CY2017	us-gaap	Interest Expense InterestExpense	115613000	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	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	100000	shares
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	700000	USD
CY2019	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	12500000	shares
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	10700000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	11300000	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	10600000	USD
CY2019	gpor	Capitalized Stock Based Compensation CapitalizedStockBasedCompensation	5800000	USD
CY2018	gpor	Capitalized Stock Based Compensation CapitalizedStockBasedCompensation	4500000	USD
CY2017	gpor	Capitalized Stock Based Compensation CapitalizedStockBasedCompensation	4200000	USD
CY2019	gpor	Sharebased Compensation Arrangementby Sharebased Payment Award Expected Award Performance Period SharebasedCompensationArrangementbySharebasedPaymentAwardExpectedAwardPerformancePeriod	P2Y
CY2019Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	121200000	USD
CY2018Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	210200000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	36415000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	22569000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	115000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	90000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	30000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	59219000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	1781000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	57438000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	24960000	USD
CY2019	gpor	Operating Lease Cost Related Party OperatingLeaseCostRelatedParty	22440000	USD
CY2019	us-gaap	Variable Lease Cost VariableLeaseCost	2172000	USD
CY2019	gpor	Variable Lease Cost Related Party VariableLeaseCostRelatedParty	66924000	USD
CY2019	us-gaap	Short Term Lease Cost ShortTermLeaseCost	834000	USD
CY2019	us-gaap	Lease Cost LeaseCost	117330000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	182000	USD
CY2019	us-gaap	Operating Lease Payments Use OperatingLeasePaymentsUse	24263000	USD
CY2019	gpor	Operating Lease Payments Use Related Party OperatingLeasePaymentsUseRelatedParty	84750000	USD
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P1Y9M
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0352
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
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	2167000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-7000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	253000	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	3362000	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
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-118000	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
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-3602000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-7563000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-69000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1809000	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
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	436961000	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
CY2017	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	152936000	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
CY2017	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	2299000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	3372000	USD
CY2018	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	1078000	USD
CY2017	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	5731000	USD
CY2019	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2018	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2017	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	190034000	USD
CY2019	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	439464000	USD
CY2018	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-91039000	USD
CY2017	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-158704000	USD
CY2019	gpor	Effective Income Tax Rate Reconciliation Changein Deferred Tax Assets Valuation Allowance Tax Cutsand Jobs Actof2017 Amount EffectiveIncomeTaxRateReconciliationChangeinDeferredTaxAssetsValuationAllowanceTaxCutsandJobsActof2017Amount	0	USD
CY2018	gpor	Effective Income Tax Rate Reconciliation Changein Deferred Tax Assets Valuation Allowance Tax Cutsand Jobs Actof2017 Amount EffectiveIncomeTaxRateReconciliationChangeinDeferredTaxAssetsValuationAllowanceTaxCutsandJobsActof2017Amount	0	USD
CY2017	gpor	Effective Income Tax Rate Reconciliation Changein Deferred Tax Assets Valuation Allowance Tax Cutsand Jobs Actof2017 Amount EffectiveIncomeTaxRateReconciliationChangeinDeferredTaxAssetsValuationAllowanceTaxCutsandJobsActof2017Amount	-190487000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-7563000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-69000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1809000	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
CY2017Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	120626000	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
CY2017Q4	gpor	Deferred Tax Asset Oiland Gas Property Basis Difference DeferredTaxAssetOilandGasPropertyBasisDifference	151260000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Investment In Subsidiaries DeferredTaxAssetsInvestmentInSubsidiaries	58951000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Investment In Subsidiaries DeferredTaxAssetsInvestmentInSubsidiaries	8620000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Investment In Subsidiaries DeferredTaxAssetsInvestmentInSubsidiaries	12343000	USD
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CY2019Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards General Business DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness	370000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards General Business DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness	369000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards General Business DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness	369000	USD
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CY2018Q4	us-gaap	Deferred Tax Assets Charitable Contribution Carryforwards DeferredTaxAssetsCharitableContributionCarryforwards	269000	USD
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CY2018Q4	us-gaap	Deferred Tax Assets Hedging Transactions DeferredTaxAssetsHedgingTransactions	2761000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Hedging Transactions DeferredTaxAssetsHedgingTransactions	0	USD
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CY2018Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Foreign DeferredTaxAssetsTaxCreditCarryforwardsForeign	2009000	USD
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CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	834000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	285000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Asset Retirement Obligations DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations	12744000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Asset Retirement Obligations DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations	16923000	USD
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CY2019Q4	gpor	Deferred Tax Asset Nonoiland Gas Property Basis Difference DeferredTaxAssetNonoilandGasPropertyBasisDifference	0	USD
CY2018Q4	gpor	Deferred Tax Asset Nonoiland Gas Property Basis Difference DeferredTaxAssetNonoilandGasPropertyBasisDifference	104000	USD
CY2017Q4	gpor	Deferred Tax Asset Nonoiland Gas Property Basis Difference DeferredTaxAssetNonoilandGasPropertyBasisDifference	171000	USD
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CY2018Q4	gpor	Deferred Tax Asset Lease Liability DeferredTaxAssetLeaseLiability	0	USD
CY2017Q4	gpor	Deferred Tax Asset Lease Liability DeferredTaxAssetLeaseLiability	0	USD
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CY2018Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	11526000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	6954000	USD
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CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	695538000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	211989000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	311047000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	647575000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	211987000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	298830000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	47963000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	2000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	12217000	USD
CY2019Q4	gpor	Deferred Tax Liabilities Nonoil And Gas Property Basis Difference DeferredTaxLiabilitiesNonoilAndGasPropertyBasisDifference	1859000	USD
CY2018Q4	gpor	Deferred Tax Liabilities Nonoil And Gas Property Basis Difference DeferredTaxLiabilitiesNonoilAndGasPropertyBasisDifference	0	USD
CY2017Q4	gpor	Deferred Tax Liabilities Nonoil And Gas Property Basis Difference DeferredTaxLiabilitiesNonoilAndGasPropertyBasisDifference	0	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	26410000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	2000	USD
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CY2017Q4	gpor	Deferred Tax Liabilities Right Of Use Asset DeferredTaxLiabilitiesRightOfUseAsset	0	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	3000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	0	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	0	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	40400000	USD
CY2018Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	2000	USD
CY2017Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	11009000	USD
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CY2018Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	0	USD
CY2017Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	1208000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-7600000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-69000.0	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Foreign DeferredTaxAssetsTaxCreditCarryforwardsForeign	900000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	647600000	USD
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CY2017	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	-347000000.0	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	3100000	USD
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CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	174675840	shares
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.46
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CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.42
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CY2018	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	722866	shares
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CY2017	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	418878	shares
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-2002358000	USD
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CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	175398706	shares
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.45
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	435152000	USD
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	180253024	shares
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CY2019Q4	us-gaap	Restructuring Charges RestructuringCharges	4600000	USD
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CY2018	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	2600000	USD
CY2017	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	3000000.0	USD
CY2019Q4	gpor	Supply Commitment Duein Next Twelve Months SupplyCommitmentDueinNextTwelveMonths	326000	MMBTU
CY2019Q4	gpor	Supply Commitment Duein Year Two SupplyCommitmentDueinYearTwo	192000	MMBTU
CY2019Q4	gpor	Supply Commitment Duein Year Three SupplyCommitmentDueinYearThree	70000	MMBTU
CY2019Q4	gpor	Supply Commitment Duein Year Four SupplyCommitmentDueinYearFour	17000	MMBTU
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CY2019	us-gaap	Loss Contingency Disclosures LossContingencyDisclosures	<div style="line-height:120%;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-weight:bold;">CONTINGENCIES</span></div><div style="line-height:120%;padding-bottom:16px;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-style:italic;">Litigation and Regulatory Proceedings</span></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">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="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">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="font-family:inherit;font-size:10pt;"><sup style="vertical-align:top;line-height:120%;font-size:7pt">th</sup></span><span style="font-family:inherit;font-size:10pt;"> Judicial District of the State of Louisiana in the 15</span><span style="font-family:inherit;font-size:10pt;"><sup style="vertical-align:top;line-height:120%;font-size:7pt">th</sup></span><span style="font-family:inherit;font-size:10pt;"> 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 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="line-height:120%;padding-bottom:16px;text-indent:24px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">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 alleges 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 seeks 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. </span></div><div style="line-height:120%;padding-bottom:16px;text-indent:24px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">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="line-height:120%;padding-bottom:16px;text-align:justify;text-indent:24px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">In October 2019, Saydee Resources, LLC, on behalf of itself and a class of similarly situated royalty holders, filed an action against the Company in the District Court of Grady County Oklahoma. The suit alleges that the Company underpaid royalty holders and seeks unspecified damages for breach of contract, tortious breach of contract, fraud and unjust enrichment.</span></div><div style="line-height:120%;text-align:left;text-indent:24px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">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 alleges that the Company underpaid royalty owners and seeks unspecified damages for violations of the Oklahoma Production Revenue Standards Act and fraud.</span></div><div style="line-height:120%;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div><div style="line-height:120%;padding-bottom:16px;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-style:italic;">SEC Investigation</span></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">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. We have fully cooperated and intend to continue to cooperate fully with the SEC’s investigation. Although it is not possible to predict the ultimate resolution or financial liability with respect to this matter, the Company believes that the outcome of this matter will not have a material effect on the Company's business, financial condition or results of operations.</span></div><div style="line-height:120%;padding-bottom:16px;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-style:italic;">Business Operations</span></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">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="line-height:120%;padding-bottom:16px;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-style:italic;">Environmental Contingencies</span></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">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="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">The Company received several Finding of Violation (“FOVs”) from the United States Environmental Protection Agency ("USEPA") alleging violations of the Clean Air Act in Ohio. The first FOV for </span><span style="font-family:inherit;font-size:10pt;"><span>one</span></span><span style="font-family:inherit;font-size:10pt;"> site was dated December 11, 2013. </span><span style="font-family:inherit;font-size:10pt;"><span>Two</span></span><span style="font-family:inherit;font-size:10pt;"> subsequent FOVs incorporated and expanded the scope on January 4, 2017 and April 15, 2019. The Company entered into a settlement with the Department of Justice and USEPA agreeing to pay </span><span style="font-family:inherit;font-size:10pt;"><span>$1.7 million</span></span><span style="font-family:inherit;font-size:10pt;"> and invest in improvements at </span><span style="font-family:inherit;font-size:10pt;"><span>17</span></span><span style="font-family:inherit;font-size:10pt;"> well pads. The settlement was filed with the U.S. District Court for the Southern District of Ohio in January 2020, and is pending approval. </span></div><div style="line-height:120%;padding-bottom:16px;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-style:italic;">Other Matters</span></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">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="line-height:120%;padding-bottom:16px;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-style:italic;">Insurance Proceeds</span></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">For the years ended </span><span style="font-family:inherit;font-size:10pt;">December 31, 2019</span><span style="font-family:inherit;font-size:10pt;"> and </span><span style="font-family:inherit;font-size:10pt;">2018</span><span style="font-family:inherit;font-size:10pt;"> the Company was reimbursed </span><span style="font-family:inherit;font-size:10pt;"><span>$0.1 million</span></span><span style="font-family:inherit;font-size:10pt;"> and </span><span style="font-family:inherit;font-size:10pt;"><span>$0.2 million</span></span><span style="font-family:inherit;font-size:10pt;">, respectively, net of related legal fees by its insurance provider, which is included in other expense (income) in the accompanying consolidated statements of operations. There were </span><span style="font-family:inherit;font-size:10pt;"><span>no</span></span><span style="font-family:inherit;font-size:10pt;"> insurance proceeds received in the year ended </span><span style="font-family:inherit;font-size:10pt;">December 31, 2017</span><span style="font-family:inherit;font-size:10pt;">. </span></div><div style="line-height:120%;padding-bottom:16px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-style:italic;">Concentration of Credit Risk</span></div><div style="line-height:120%;padding-bottom:16px;text-indent:24px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">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="line-height:120%;padding-bottom:16px;text-indent:24px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">The Company maintains cash balances at several banks. Accounts at each institution are insured by the Federal Deposit Insurance Corporation up to </span><span style="font-family:inherit;font-size:10pt;"><span>$250,000</span></span><span style="font-family:inherit;font-size:10pt;">. At </span><span style="font-family:inherit;font-size:10pt;">December 31, 2019</span><span style="font-family:inherit;font-size:10pt;">, Gulfport held cash in excess of insured limits in these banks totaling </span><span style="font-family:inherit;font-size:10pt;"><span>$5.6 million</span></span><span style="font-family:inherit;font-size:10pt;">.</span></div><span style="font-family:inherit;font-size:10pt;">During the year ended </span><span style="font-family:inherit;font-size:10pt;">December 31, 2019</span><span style="font-family:inherit;font-size:10pt;">, </span><span style="font-family:inherit;font-size:10pt;background-color:#ffffff;">one</span><span style="font-family:inherit;font-size:10pt;"> customer accounted for approximately </span><span style="font-family:inherit;font-size:10pt;"><span>14%</span></span><span style="font-family:inherit;font-size:10pt;"> of the Company's total sales. During the year ended </span><span style="font-family:inherit;font-size:10pt;">December 31, 2018</span><span style="font-family:inherit;font-size:10pt;">, two customers accounted for approximately </span><span style="font-family:inherit;font-size:10pt;"><span>17%</span></span><span style="font-family:inherit;font-size:10pt;"> and </span><span style="font-family:inherit;font-size:10pt;"><span>10%</span></span><span style="font-family:inherit;font-size:10pt;"> of the Company's total sales. During the year ended </span><span style="font-family:inherit;font-size:10pt;">December 31, 2017</span><span style="font-family:inherit;font-size:10pt;">, one customer accounted for approximately </span><span style="font-family:inherit;font-size:10pt;"><span>40%</span></span> 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.
CY2013Q4	gpor	Site Contingency Numberof Siteswith Violation SiteContingencyNumberofSiteswithViolation	1	violation
CY2019Q2	gpor	Site Contingency Numberof Siteswith Violation SiteContingencyNumberofSiteswithViolation	2	violation
CY2019	us-gaap	Insurance Recoveries InsuranceRecoveries	100000	USD
CY2018	us-gaap	Insurance Recoveries InsuranceRecoveries	200000	USD
CY2017	us-gaap	Insurance Recoveries InsuranceRecoveries	0	USD
CY2019Q4	us-gaap	Cash Uninsured Amount CashUninsuredAmount	5600000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	6060000	USD
CY2019Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	121210000	USD
CY2019Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	563000	USD
CY2019Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	7563000	USD
CY2019Q4	us-gaap	Inventory Noncurrent InventoryNoncurrent	5182000	USD
CY2019Q4	us-gaap	Oil And Gas Joint Interest Billing Receivables Current OilAndGasJointInterestBillingReceivablesCurrent	47975000	USD
CY2019Q4	us-gaap	Due From Affiliate Current DueFromAffiliateCurrent	0	USD
CY2019Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	4431000	USD
CY2019Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	126201000	USD
CY2019Q4	us-gaap	Assets Current AssetsCurrent	305877000	USD
CY2019Q4	us-gaap	Oil And Gas Property Full Cost Method Gross OilAndGasPropertyFullCostMethodGross	10595735000	USD
CY2019Q4	gpor	Property Plantand Equipment Other Than Oil And Gas Property Gross PropertyPlantandEquipmentOtherThanOilAndGasPropertyGross	96719000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	7228660000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	3463794000	USD
CY2019Q4	us-gaap	Equity Method Investments EquityMethodInvestments	32044000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	14168000	USD
CY2019Q4	gpor	Operating Lease Rightof Use Asset Related Parties OperatingLeaseRightofUseAssetRelatedParties	43270000	USD
CY2019Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	10358000	USD
CY2019Q4	gpor	Total Other Assets TotalOtherAssets	113148000	USD
CY2019Q4	us-gaap	Assets Assets	3882819000	USD
CY2019Q4	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	415218000	USD
CY2019Q4	us-gaap	Due To Affiliate Current DueToAffiliateCurrent	0	USD
CY2019Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	303000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	13826000	USD
CY2019Q4	gpor	Operating Lease Liability Current Related Parties OperatingLeaseLiabilityCurrentRelatedParties	21220000	USD
CY2019Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	631000	USD
CY2019Q4	us-gaap	Liabilities Current LiabilitiesCurrent	451198000	USD
CY2019Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	53135000	USD
CY2019Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	60355000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	3127000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	342000	USD
CY2019Q4	gpor	Operating Lease Liability Noncurrent Related Parties OperatingLeaseLiabilityNoncurrentRelatedParties	22050000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1978020000	USD
CY2019Q4	us-gaap	Liabilities Liabilities	2568227000	USD
CY2019Q4	us-gaap	Common Stock Value CommonStockValue	1597000	USD
CY2019Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	4207554000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-46833000	USD
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-2847726000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	1314592000	USD
CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	3882819000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	52297000	USD
CY2018Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	210200000	USD
CY2018Q4	us-gaap	Oil And Gas Joint Interest Billing Receivables Current OilAndGasJointInterestBillingReceivablesCurrent	22497000	USD
CY2018Q4	us-gaap	Due From Affiliate Current DueFromAffiliateCurrent	0	USD
CY2018Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	10017000	USD
CY2018Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	21352000	USD
CY2018Q4	us-gaap	Assets Current AssetsCurrent	316363000	USD
CY2018Q4	us-gaap	Oil And Gas Property Full Cost Method Gross OilAndGasPropertyFullCostMethodGross	10026836000	USD
CY2018Q4	gpor	Property Plantand Equipment Other Than Oil And Gas Property Gross PropertyPlantandEquipmentOtherThanOilAndGasPropertyGross	92667000	USD
CY2018Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	4640098000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	5479405000	USD
CY2018Q4	us-gaap	Equity Method Investments EquityMethodInvestments	236121000	USD
CY2018Q4	us-gaap	Inventory Noncurrent InventoryNoncurrent	5344000	USD
CY2018Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	13803000	USD
CY2018Q4	gpor	Total Other Assets TotalOtherAssets	255268000	USD
CY2018Q4	us-gaap	Assets Assets	6051036000	USD
CY2018Q4	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	518380000	USD
CY2018Q4	us-gaap	Due To Affiliate Current DueToAffiliateCurrent	0	USD
CY2018Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	20401000	USD
CY2018Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	651000	USD
CY2018Q4	us-gaap	Liabilities Current LiabilitiesCurrent	539432000	USD
CY2018Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	13992000	USD
CY2018Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	79952000	USD
CY2018Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	3127000	USD
CY2018Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	2086765000	USD
CY2018Q4	us-gaap	Liabilities Liabilities	2723268000	USD
CY2018Q4	us-gaap	Common Stock Value CommonStockValue	1630000	USD
CY2018Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	4227532000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-56026000	USD
CY2018Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-845368000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	3327768000	USD
CY2018Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	6051036000	USD
CY2019	us-gaap	Revenues Revenues	1346008000	USD
CY2019	us-gaap	Operating Lease Expense OperatingLeaseExpense	82998000	USD
CY2019	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	28571000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	550108000	USD
CY2019	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	2039770000	USD
CY2019	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	47979000	USD
CY2018	us-gaap	Operating Lease Expense OperatingLeaseExpense	91640000	USD
CY2019	us-gaap	Interest Expense InterestExpense	141786000	USD
CY2019	us-gaap	Investment Income Interest InvestmentIncomeInterest	801000	USD
CY2018	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	33480000	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	48630000	USD
CY2019	us-gaap	Restructuring Charges RestructuringCharges	4611000	USD
CY2019	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	3939000	USD
CY2019	us-gaap	Costs And Expenses CostsAndExpenses	3049701000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	-1703693000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-210148000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-3725000	USD
CY2019	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-306228000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-2009921000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-7563000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-2002358000	USD
CY2018	us-gaap	Revenues Revenues	1355044000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	486664000	USD
CY2018	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	49994000	USD
CY2018	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	4119000	USD
CY2018	us-gaap	Costs And Expenses CostsAndExpenses	956085000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	398959000	USD
CY2018	us-gaap	Interest Expense InterestExpense	141912000	USD
CY2018	us-gaap	Investment Income Interest InvestmentIncomeInterest	314000	USD
CY2018	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	124768000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	49904000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-1542000	USD
CY2018	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	31532000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	430491000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-69000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	430560000	USD
CY2017	us-gaap	Revenues Revenues	1320303000	USD
CY2017	us-gaap	Operating Lease Expense OperatingLeaseExpense	80246000	USD
CY2017	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	21126000	USD
CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	364629000	USD
CY2017	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	0	USD
CY2017	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	45523000	USD
CY2017	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	1611000	USD
CY2017	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	2392000	USD
CY2017	us-gaap	Costs And Expenses CostsAndExpenses	764522000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	555781000	USD
CY2017	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-17780000	USD
CY2017	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	1041000	USD
CY2017	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-118820000	USD
CY2017	us-gaap	Interest Expense InterestExpense	115613000	USD
CY2017	us-gaap	Investment Income Interest InvestmentIncomeInterest	1009000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	436961000	USD
CY2017	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	12523000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1809000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	435152000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-2002358000	USD
CY2019	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	9193000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	9193000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-1993165000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	430560000	USD
CY2018	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-15487000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-15487000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	415073000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	435152000	USD
CY2017	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	12519000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	12519000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	447671000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	723993000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-674771000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-95459000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-46237000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	52297000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	6060000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	786271000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-676874000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-156657000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-47260000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	99557000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	52297000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	679889000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2474168000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	432961000	USD
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-1361318000	USD
CY2016Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1460875000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	99557000	USD
CY2019Q4	us-gaap	Capitalized Costs Proved Properties CapitalizedCostsProvedProperties	8909069000	USD
CY2018Q4	us-gaap	Capitalized Costs Proved Properties CapitalizedCostsProvedProperties	7153799000	USD
CY2019Q4	us-gaap	Capitalized Costs Unproved Properties CapitalizedCostsUnprovedProperties	1686666000	USD
CY2018Q4	us-gaap	Capitalized Costs Unproved Properties CapitalizedCostsUnprovedProperties	2873037000	USD
CY2019Q4	us-gaap	Capitalized Costs Oil And Gas Producing Activities Gross CapitalizedCostsOilAndGasProducingActivitiesGross	10595735000	USD
CY2018Q4	us-gaap	Capitalized Costs Oil And Gas Producing Activities Gross CapitalizedCostsOilAndGasProducingActivitiesGross	10026836000	USD
CY2019Q4	us-gaap	Capitalized Costs Accumulated Depreciation Depletion Amortization And Valuation Allowance For Relating To Oil And Gas Producing Activities CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities	7191957000	USD
CY2018Q4	us-gaap	Capitalized Costs Accumulated Depreciation Depletion Amortization And Valuation Allowance For Relating To Oil And Gas Producing Activities CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities	4613293000	USD
CY2019Q4	us-gaap	Capitalized Costs Oil And Gas Producing Activities Net CapitalizedCostsOilAndGasProducingActivitiesNet	3403778000	USD
CY2018Q4	us-gaap	Capitalized Costs Oil And Gas Producing Activities Net CapitalizedCostsOilAndGasProducingActivitiesNet	5413543000	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
CY2017	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties CostsIncurredAcquisitionOfOilAndGasProperties	1946416000	USD
CY2019	us-gaap	Costs Incurred Development Costs CostsIncurredDevelopmentCosts	594673000	USD
CY2018	us-gaap	Costs Incurred Development Costs CostsIncurredDevelopmentCosts	714269000	USD
CY2017	us-gaap	Costs Incurred Development Costs CostsIncurredDevelopmentCosts	1138951000	USD
CY2019	us-gaap	Costs Incurred Exploration Costs CostsIncurredExplorationCosts	9762000	USD
CY2018	us-gaap	Costs Incurred Exploration Costs CostsIncurredExplorationCosts	22081000	USD
CY2017	us-gaap	Costs Incurred Exploration Costs CostsIncurredExplorationCosts	9058000	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
CY2017	gpor	Total Costs Incurred In Oil And Gas Properties Acquisition And Development Activities TotalCostsIncurredInOilAndGasPropertiesAcquisitionAndDevelopmentActivities	3094425000	USD
CY2017	us-gaap	Results Of Operations Revenue From Oil And Gas Producing Activities ResultsOfOperationsRevenueFromOilAndGasProducingActivities	1106624000	USD
CY2019	us-gaap	Results Of Operations Oil And Gas Producing Activities Net Income Excluding Corporate Overhead And Interest Costs ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts	-1837232000	USD
CY2019	gpor	Capitalized Costsof Unproved Properties Period Cost CapitalizedCostsofUnprovedPropertiesPeriodCost	30100000	USD
CY2018	gpor	Capitalized Costsof Unproved Properties Period Cost CapitalizedCostsofUnprovedPropertiesPeriodCost	37700000	USD
CY2017	gpor	Capitalized Costsof Unproved Properties Period Cost CapitalizedCostsofUnprovedPropertiesPeriodCost	35700000	USD
CY2019	us-gaap	Results Of Operations Revenue From Oil And Gas Producing Activities ResultsOfOperationsRevenueFromOilAndGasProducingActivities	1137648000	USD
CY2018	us-gaap	Results Of Operations Revenue From Oil And Gas Producing Activities ResultsOfOperationsRevenueFromOilAndGasProducingActivities	1478523000	USD
CY2019	us-gaap	Results Of Operations Production Or Lifting Costs ResultsOfOperationsProductionOrLiftingCosts	403294000	USD
CY2018	us-gaap	Results Of Operations Production Or Lifting Costs ResultsOfOperationsProductionOrLiftingCosts	415308000	USD
CY2017	us-gaap	Results Of Operations Production Or Lifting Costs ResultsOfOperationsProductionOrLiftingCosts	350367000	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
CY2017	us-gaap	Results Of Operations Depreciation Depletion And Amortization And Valuation Provisions ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions	358792000	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
CY2017	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	0	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
CY2017	us-gaap	Results Of Operations Income Tax Expense ResultsOfOperationsIncomeTaxExpense	-240000	USD
CY2018	us-gaap	Results Of Operations Oil And Gas Producing Activities Net Income Excluding Corporate Overhead And Interest Costs ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts	586766000	USD
CY2017	us-gaap	Results Of Operations Oil And Gas Producing Activities Net Income Excluding Corporate Overhead And Interest Costs ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts	397705000	USD
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
CY2017	gpor	Depletionper Mc Fof Gas Equivalent DepletionperMCFofGasEquivalent	0.90	usd_per_mcf
CY2019	srt	Proved Developed And Undeveloped Reserve Extension And Discovery Energy ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy	1100	Bcfe
CY2019Q4	gpor	Proved Developedand Undeveloped Reserve Decrease Percentage ProvedDevelopedandUndevelopedReserveDecreasePercentage	0.005
CY2018	srt	Proved Developed And Undeveloped Reserve Extension And Discovery Energy ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy	711.2	Bcfe
CY2019Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Cash Inflows FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows	10451179000	USD
CY2018Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Cash Inflows FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows	14483197000	USD
CY2017Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Cash Inflows FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows	11202692000	USD
CY2019Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Development Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts	2058374000	USD
CY2018Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Development Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts	2437853000	USD
CY2017Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Development Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts	3005217000	USD
CY2019Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Production Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts	4512940000	USD
CY2018Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Production Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts	5067554000	USD
CY2017Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Production Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts	2152821000	USD
CY2019Q4	gpor	Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Production Taxes DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesFutureProductionTaxes	332525000	USD
CY2018Q4	gpor	Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Production Taxes DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesFutureProductionTaxes	455840000	USD
CY2017Q4	gpor	Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Production Taxes DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesFutureProductionTaxes	289944000	USD
CY2019Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Income Tax Expense FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense	0	USD
CY2018Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Income Tax Expense FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense	943293000	USD
CY2017Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Income Tax Expense FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense	573965000	USD
CY2019Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Net Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows	3547340000	USD
CY2018Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Net Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows	5578657000	USD
CY2017Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Net Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows	5180745000	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	1843753000	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	2595932000	USD
CY2017Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Ten Percent Annual Discount For Estimated Timing Of Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows	2537181000	USD
CY2019Q4	srt	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	1703587000	USD
CY2018Q4	srt	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	2982725000	USD
CY2017Q4	srt	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	2643564000	USD
CY2019	srt	Sales And Transfers Of Oil And Gas Produced Net Of Production Costs SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts	734354000	USD
CY2018	srt	Sales And Transfers Of Oil And Gas Produced Net Of Production Costs SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts	1063215000	USD
CY2017	srt	Sales And Transfers Of Oil And Gas Produced Net Of Production Costs SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts	756257000	USD
CY2019	gpor	Net Changes In Prices Production Costs And Development NetChangesInPricesProductionCostsAndDevelopment	-1372443000	USD
CY2018	gpor	Net Changes In Prices Production Costs And Development NetChangesInPricesProductionCostsAndDevelopment	590519000	USD
CY2017	gpor	Net Changes In Prices Production Costs And Development NetChangesInPricesProductionCostsAndDevelopment	913714000	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
CY2017	srt	Increase Due To Purchases Of Minerals In Place IncreaseDueToPurchasesOfMineralsInPlace	703866000	USD
CY2019	srt	Extensions Discoveries Additions And Improved Recovery Less Related Costs ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts	388151000	USD
CY2018	srt	Extensions Discoveries Additions And Improved Recovery Less Related Costs ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts	519137000	USD
CY2017	srt	Extensions Discoveries Additions And Improved Recovery Less Related Costs ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts	618039000	USD
CY2019	srt	Previously Estimated Development Costs Incurred PreviouslyEstimatedDevelopmentCostsIncurred	405979000	USD
CY2018	srt	Previously Estimated Development Costs Incurred PreviouslyEstimatedDevelopmentCostsIncurred	402156000	USD
CY2017	srt	Previously Estimated Development Costs Incurred PreviouslyEstimatedDevelopmentCostsIncurred	390673000	USD
CY2019	srt	Revisions Of Previous Quantity Estimates RevisionsOfPreviousQuantityEstimates	-321397000	USD
CY2018	srt	Revisions Of Previous Quantity Estimates RevisionsOfPreviousQuantityEstimates	-356933000	USD
CY2017	srt	Revisions Of Previous Quantity Estimates RevisionsOfPreviousQuantityEstimates	155200000	USD
CY2019	srt	Decrease Due To Sales Of Minerals In Place DecreaseDueToSalesOfMineralsInPlace	48547000	USD
CY2018	srt	Decrease Due To Sales Of Minerals In Place DecreaseDueToSalesOfMineralsInPlace	25882000	USD
CY2017	srt	Decrease Due To Sales Of Minerals In Place DecreaseDueToSalesOfMineralsInPlace	0	USD
CY2019	srt	Standardized Measure Of Discounted Future Net Cash Flow Relating To Proved Oil And Gas Reserves Accretion Of Discount StandardizedMeasureOfDiscountedFutureNetCashFlowRelatingToProvedOilAndGasReservesAccretionOfDiscount	298273000	USD
CY2018	srt	Standardized Measure Of Discounted Future Net Cash Flow Relating To Proved Oil And Gas Reserves Accretion Of Discount StandardizedMeasureOfDiscountedFutureNetCashFlowRelatingToProvedOilAndGasReservesAccretionOfDiscount	264356000	USD
CY2017	srt	Standardized Measure Of Discounted Future Net Cash Flow Relating To Proved Oil And Gas Reserves Accretion Of Discount StandardizedMeasureOfDiscountedFutureNetCashFlowRelatingToProvedOilAndGasReservesAccretionOfDiscount	68804000	USD
CY2018Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	15373000	USD
CY2018Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	115116000	USD
CY2018Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	156480000	USD
CY2018Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-69000	USD
CY2019	srt	Increase Decrease In Future Income Tax Expense Estimates On Future Cash Flows Related To Proved Oil And Gas Reserves IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves	424628000	USD
CY2018	srt	Increase Decrease In Future Income Tax Expense Estimates On Future Cash Flows Related To Proved Oil And Gas Reserves IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves	-185157000	USD
CY2017	srt	Increase Decrease In Future Income Tax Expense Estimates On Future Cash Flows Related To Proved Oil And Gas Reserves IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves	-231545000	USD
CY2019	gpor	Change In Production Rates And Other ChangeInProductionRatesAndOther	-319428000	USD
CY2018	gpor	Change In Production Rates And Other ChangeInProductionRatesAndOther	194180000	USD
CY2017	gpor	Change In Production Rates And Other ChangeInProductionRatesAndOther	93030000	USD
CY2019	srt	Standardized Measure Of Discounted Future Net Cash Flow Of Proved Oil And Gas Reserves Period Increase Decrease StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesPeriodIncreaseDecrease	-1279138000	USD
CY2018	srt	Standardized Measure Of Discounted Future Net Cash Flow Of Proved Oil And Gas Reserves Period Increase Decrease StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesPeriodIncreaseDecrease	339161000	USD
CY2017	srt	Standardized Measure Of Discounted Future Net Cash Flow Of Proved Oil And Gas Reserves Period Increase Decrease StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesPeriodIncreaseDecrease	1955524000	USD
CY2019Q1	us-gaap	Revenues Revenues	320578000	USD
CY2019Q2	us-gaap	Revenues Revenues	458994000	USD
CY2019Q3	us-gaap	Revenues Revenues	285175000	USD
CY2019Q4	us-gaap	Revenues Revenues	281261000	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
CY2018Q1	us-gaap	Revenues Revenues	325392000	USD
CY2018Q2	us-gaap	Revenues Revenues	252740000	USD
CY2018Q3	us-gaap	Revenues Revenues	360962000	USD
CY2018Q4	us-gaap	Revenues Revenues	415950000	USD
CY2018Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	111990000	USD
CY2018Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	0	USD
CY2018Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	0	USD
CY2018Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	0	USD
CY2018Q1	us-gaap	Net Income Loss NetIncomeLoss	90090000	USD
CY2018Q2	us-gaap	Net Income Loss NetIncomeLoss	111319000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	95150000	USD
CY2018Q4	us-gaap	Net Income Loss NetIncomeLoss	134001000	USD
CY2018Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.50
CY2018Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.64
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.55
CY2018Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.78
CY2018Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.50
CY2018Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.64
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.55
CY2018Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.78

Files In Submission

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$GPOR
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2019 Q4 Form 10-K Financial Statement

#000162828020002453 Filed on February 27, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$GPOR GULFPORT ENERGY CORP Stock $gpor

2019 Q4 Form 10-K Financial Statement

#000162828020002453 Filed on February 27, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$GPOR
GULFPORT ENERGY CORP Stock $gpor