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Common Stock Options, Warrants And Changes In Capitalization (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended |  |  |  |  |  |  |
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Feb. 15, 2013 | Dec. 24, 2012 acre | Mar. 31, 2002 | Nov. 13, 2013 | Jan. 07, 2013 | Dec. 24, 2012 | Mar. 31, 2012 | Feb. 28, 2014 acre | Dec. 19, 2012 acre | Dec. 17, 2012 acre | Apr. 19, 2013 | Apr. 20, 2006 | Apr. 19, 2006
Common Stock Options, Restricted Stock, Warrants And Changes In Capitalization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock, net of offering costs | $ 689 us-gaap_ProceedsFromIssuanceOfCommonStock | $ 766,495 us-gaap_ProceedsFromIssuanceOfCommonStock | $ 427,091 us-gaap_ProceedsFromIssuanceOfCommonStock |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (usd per share) | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividend rate | 12.00%us-gaap_PreferredStockDividendRatePercentage | 12.00%us-gaap_PreferredStockDividendRatePercentage |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants, expired |  |  |  |  |  |  |  |  |  | 8,875 gpor_ClassOfWarrantOrRightExpired |  |  |  |  |  |
Utica Shale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Options, Restricted Stock, Warrants And Changes In Capitalization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock, net of offering costs |  |  |  | 325,800 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_BusinessAcquisitionAxis = gpor_UticaShaleMember | 460,700 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_BusinessAcquisitionAxis = gpor_UticaShaleMember |  |  |  |  |  |  |  |  |  |  |
Gas and oil acreage, undeveloped, net |  |  |  | 22,000 us-gaap_GasAndOilAreaUndevelopedNet / us-gaap_BusinessAcquisitionAxis = gpor_UticaShaleMember | 37,000 us-gaap_GasAndOilAreaUndevelopedNet / us-gaap_BusinessAcquisitionAxis = gpor_UticaShaleMember |  |  |  | 37,000 us-gaap_GasAndOilAreaUndevelopedNet / us-gaap_BusinessAcquisitionAxis = gpor_UticaShaleMember |  | 8,000 us-gaap_GasAndOilAreaUndevelopedNet / us-gaap_BusinessAcquisitionAxis = gpor_UticaShaleMember | 7,000 us-gaap_GasAndOilAreaUndevelopedNet / us-gaap_BusinessAcquisitionAxis = gpor_UticaShaleMember | 30,000 us-gaap_GasAndOilAreaUndevelopedNet / us-gaap_BusinessAcquisitionAxis = gpor_UticaShaleMember |  |  |
Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Options, Restricted Stock, Warrants And Changes In Capitalization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Private placement offering (in units) |  |  |  |  |  | 10,000 gpor_PrivatePlacementUnitsOffered / gpor_SaleOfStockAxis = us-gaap_PrivatePlacementMember |  |  |  |  |  |  |  |  |  |
Number of securities called by each warrant (shares) |  |  |  |  |  | 250 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight / gpor_SaleOfStockAxis = us-gaap_PrivatePlacementMember |  |  |  |  |  |  |  |  |  |
Common stock, par value (usd per share) |  |  |  |  |  | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare / gpor_SaleOfStockAxis = us-gaap_PrivatePlacementMember |  |  |  |  |  |  |  |  |  |
Preferred stock dividend rate |  |  |  |  |  | 15.00%us-gaap_PreferredStockDividendRatePercentage / gpor_SaleOfStockAxis = us-gaap_PrivatePlacementMember |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  |  |  | 12.00%gpor_PreferredStockDividendRateStockPercentage / gpor_SaleOfStockAxis = us-gaap_PrivatePlacementMember |  |  |  |  |  |  |  |  |  |
Warrants outstanding |  |  |  |  |  | 2,322,962 us-gaap_ClassOfWarrantOrRightOutstanding / gpor_SaleOfStockAxis = us-gaap_PrivatePlacementMember |  |  |  |  |  |  |  |  |  |
Term Of warrants expiration |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |
Warrant, exercise price (usd per share) |  |  |  |  |  | 1.19 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights / gpor_SaleOfStockAxis = us-gaap_PrivatePlacementMember |  |  |  |  |  |  |  |  |  |
Common Stock [Member] | Public Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Options, Restricted Stock, Warrants And Changes In Capitalization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock in public offering (shares) |  |  |  | 8,912,500 us-gaap_StockIssuedDuringPeriodSharesNewIssues / gpor_SaleOfStockAxis = gpor_PublicOfferingMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |  | 7,475,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / gpor_SaleOfStockAxis = gpor_PublicOfferingMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  | 11,750,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / gpor_SaleOfStockAxis = gpor_PublicOfferingMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |
Stock option, portion available to underwriters (shares) |  |  |  |  |  |  |  |  | 1,650,000 gpor_StockIssuedDuringPeriodSharesOverAllotmentOptionSharesAvailableToUnderwriters / gpor_SaleOfStockAxis = gpor_PublicOfferingMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |
Stock option, portion attributable to underwriters (shares) |  |  |  |  |  |  |  | 900,000 gpor_StockIssuedDuringPeriodSharesOverAllotmentOptionPortionAttributableToUnderwriters / gpor_SaleOfStockAxis = gpor_PublicOfferingMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 750,000 gpor_StockIssuedDuringPeriodSharesOverAllotmentOptionPortionAttributableToUnderwriters / gpor_SaleOfStockAxis = gpor_PublicOfferingMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |
Share price (usd per share) |  |  |  | $ 38.00 us-gaap_SharesIssuedPricePerShare / gpor_SaleOfStockAxis = gpor_PublicOfferingMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | $ 38.00 us-gaap_SharesIssuedPricePerShare / gpor_SaleOfStockAxis = gpor_PublicOfferingMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  | $ 56.75 us-gaap_SharesIssuedPricePerShare / gpor_SaleOfStockAxis = gpor_PublicOfferingMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  | $ 38.00 us-gaap_SharesIssuedPricePerShare / gpor_SaleOfStockAxis = gpor_PublicOfferingMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |
Proceeds from issuance of common stock, net of offering costs |  |  |  | $ 325,800 us-gaap_ProceedsFromIssuanceOfCommonStock / gpor_SaleOfStockAxis = gpor_PublicOfferingMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |  | $ 408,000 us-gaap_ProceedsFromIssuanceOfCommonStock / gpor_SaleOfStockAxis = gpor_PublicOfferingMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  | $ 460,700 us-gaap_ProceedsFromIssuanceOfCommonStock / gpor_SaleOfStockAxis = gpor_PublicOfferingMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |
1999 Stock Option Plan [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Options, Restricted Stock, Warrants And Changes In Capitalization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted to employees under previous plan (shares) |  | 627,337 gpor_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateOptionsGranted / us-gaap_PlanNameAxis = gpor_NineteenNinetyNineStockOptionPlanMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |  |  |  |  | 627,337 gpor_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateOptionsGranted / us-gaap_PlanNameAxis = gpor_NineteenNinetyNineStockOptionPlanMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |
2005 Stock Incentive Plan [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Options, Restricted Stock, Warrants And Changes In Capitalization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for grant (shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 258,361 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = gpor_TwoThousandFiveStockIncentivePlanMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 3,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = gpor_TwoThousandFiveStockIncentivePlanMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 1,904,606 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = gpor_TwoThousandFiveStockIncentivePlanMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Granted for purchase of previous Plan's common stock (shares) | 997,269 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_PlanNameAxis = gpor_TwoThousandFiveStockIncentivePlanMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2013 Restated Stock Incentive Plan [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Options, Restricted Stock, Warrants And Changes In Capitalization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for grant (shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,500,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = gpor_TwoThousandThirteenRestatedStockIncentivePlanMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 3,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = gpor_TwoThousandThirteenRestatedStockIncentivePlanMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
Restricted Stock [Member] | 2005 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Options, Restricted Stock, Warrants And Changes In Capitalization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted for purchase of previous Plan's common stock (shares) | 1,143,217 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_PlanNameAxis = gpor_TwoThousandFiveStockIncentivePlanMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RestrictedStockMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Fractional interest owned based on working interests or other economic arrangements of lease area on which wells have not been drilled or completed to a point that would permit the production of commercial quantities of oil and gas regardless of whether or not such area contains proved reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Industry Guide -Number 2 -Paragraph 5 + Details
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