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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