XML 67 R55.htm IDEA: XBRL DOCUMENT
v3.21.1

COMMITMENTS AND CONTINGENCIES (Schedule of Firm Sales Contracted with Third Parties) (Details) MMBTU in Thousands | Mar. 31, 2021 MMBTU
--- | ---
Commitments and Contingencies Disclosure [Abstract] |
Remaining 2021 (MMBtu per day) | 61
2022 (MMBtu per day) | 49
2023 (MMBtu per day) | 17
Total (MMBtu per day) | 127

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

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

X
- Definition Supply Commitment, Total + References No definition available. + Details
Name: | gpor_SupplyCommitmentTotal
Namespace Prefix: | gpor_
Data Type: | num: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