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v3.19.2

COMMITTMENTS AND CONTINGENCIES (Future Commitments) (Details) $ in Thousands | Jun. 30, 2019 USD ($) MMBTU
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Commitments [Line Items] |
Remaining 2019 (in mmbtu) | MMBTU | 493,000
2020 (in mmbtu) | MMBTU | 276,000
2021 (in mmbtu) | MMBTU | 179,000
2022 (in mmbtu) | MMBTU | 70,000
2023 (in mmbtu) | MMBTU | 42,000
Thereafter (in mmbtu) | MMBTU | 25,000
Total (in mmbtu) | MMBTU | 1,085,000
2020 | $ 24,000
2021 | 24,000
Total | 60,000
Transportation commitment |
Commitments [Line Items] |
Remaining 2019 | 122,128
2020 | 273,973
2021 | 273,011
2022 | 273,011
2023 | 268,209
Thereafter | 2,283,229
Total | $ 3,493,561

X
- Definition Commitments [Line Items] + References No definition available. + Details
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Namespace Prefix: | gpor_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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
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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
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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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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
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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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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
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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
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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: |