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COMMITMENTS AND CONTINGENCIES (Schedule of Firm Sales Contracted with Third Parties) (Details) MMBTU in Thousands | Sep. 30, 2021 MMBTU
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Commitments and Contingencies Disclosure [Abstract] |
Remaining 2021 (MMBtu per day) | 16
2022 (MMBtu per day) | 4

X
- Definition Supply Commitment, Due in Year One + References No definition available. + Details
Name: | gpor_SupplyCommitmentDueInYearOne
Namespace Prefix: | gpor_
Data Type: | dtr-types:energyItemType
Balance Type: | na
Period Type: | instant

X
- Definition Supply Commitment, Remainder of Fiscal Year + References No definition available. + Details
Name: | gpor_SupplyCommitmentRemainderofFiscalYear
Namespace Prefix: | gpor_
Data Type: | dtr-types:energyItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration