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v3.20.2

SUBSEQUENT EVENTS (Applicable Rate) (Details) - Subsequent Event - Line of Credit - Revolving credit agreement | Jul. 27, 2020
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Level 1 |
Subsequent Event [Line Items] |
Commitment fee | 37.50%
Level 2 |
Subsequent Event [Line Items] |
Commitment fee | 37.50%
Level 3 |
Subsequent Event [Line Items] |
Commitment fee | 50.00%
Level 4 |
Subsequent Event [Line Items] |
Commitment fee | 50.00%
Level 5 |
Subsequent Event [Line Items] |
Commitment fee | 50.00%
Eurodollar Rate Loans | Level 1 |
Subsequent Event [Line Items] |
Variable interest rate | 200.00%
Eurodollar Rate Loans | Level 2 |
Subsequent Event [Line Items] |
Variable interest rate | 225.00%
Eurodollar Rate Loans | Level 3 |
Subsequent Event [Line Items] |
Variable interest rate | 250.00%
Eurodollar Rate Loans | Level 4 |
Subsequent Event [Line Items] |
Variable interest rate | 275.00%
Eurodollar Rate Loans | Level 5 |
Subsequent Event [Line Items] |
Variable interest rate | 300.00%
Base Rate Loans | Level 1 |
Subsequent Event [Line Items] |
Variable interest rate | 100.00%
Base Rate Loans | Level 2 |
Subsequent Event [Line Items] |
Variable interest rate | 125.00%
Base Rate Loans | Level 3 |
Subsequent Event [Line Items] |
Variable interest rate | 150.00%
Base Rate Loans | Level 4 |
Subsequent Event [Line Items] |
Variable interest rate | 175.00%
Base Rate Loans | Level 5 |
Subsequent Event [Line Items] |
Variable interest rate | 200.00%

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_LineOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=gpor_AmendedAndRestatedCreditAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | gpor_VariableRateComponentAxis=gpor_LevelTwoCreditFacilityApplicableRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | gpor_VariableRateComponentAxis=gpor_LevelThreeCreditFacililtyApplicableRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | gpor_VariableRateComponentAxis=gpor_LevelFourCreditFacilityApplicableRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | gpor_VariableRateComponentAxis=gpor_LevelFiveCreditFacilityApplicableRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |