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v3.19.1

COMMITTMENTS AND CONTINGENCIES (Future Commitments) (Details) $ in Thousands | Mar. 31, 2019 USD ($) MMBTU
--- | ---
Remaining 2019 (in mmbtu) | MMBTU | 469,000
2020 (in mmbtu) | MMBTU | 257,000
2021 (in mmbtu) | MMBTU | 169,000
2022 (in mmbtu) | MMBTU | 61,000
2023 (in mmbtu) | MMBTU | 42,000
Thereafter (in mmbtu) | MMBTU | 25,000
Total (in mmbtu) | MMBTU | 1,023,000
2020 | $ 24,000
2021 | 24,000
Total | 66,000
Transportation commitment |
Remaining 2019 | 191,493
2020 | 287,619
2021 | 286,657
2022 | 286,657
2023 | 281,855
Thereafter | 2,394,486
Total | $ 3,728,767

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

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

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

X
- Definition Supply Commitment, Due in Year Three + References No definition available. + Details
Name: | gpor_SupplyCommitmentDueinYearThree
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
- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
Name: | us-gaap_OtherCommitment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of other commitment maturing after the fifth fiscal year following the latest fiscal year for commitments not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in this taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
Name: | us-gaap_OtherCommitmentDueAfterFifthYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of other commitment maturing in the fifth fiscal year following the latest fiscal year for commitments not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in this taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
Name: | us-gaap_OtherCommitmentDueInFifthYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of other commitment maturing in the fourth fiscal year following the latest fiscal year for commitments not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in this taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
Name: | us-gaap_OtherCommitmentDueInFourthYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of other commitment maturing in the second fiscal year following the latest fiscal year for commitments not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in this taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
Name: | us-gaap_OtherCommitmentDueInSecondYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of other commitment maturing in the third fiscal year following the latest fiscal year for commitments not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in this taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
Name: | us-gaap_OtherCommitmentDueInThirdYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of other commitments maturing in the remainder of the fiscal year following the latest fiscal year ended. + References No definition available. + Details
Name: | us-gaap_OtherCommitmentsFutureMinimumPaymentsRemainderOfFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_OtherCommitmentsAxis=gpor_TransportationCommitmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |