XML 64 R53.htm IDEA: XBRL DOCUMENT
v3.23.1

DERIVATIVE INSTRUMENTS - Schedule of Derivative Instruments (Details) | 3 Months Ended
--- | ---
Mar. 31, 2023 MMBTU $ / MMBTU $ / bbl bbl
NYMEX Henry Hub - Remaining 2022 |
Derivative [Line Items] |
Daily volume (in MMBtu) | MMBTU | 220,145
Weighted average price (in usd per MMBtu or Bbl) | 4.13
NYMEX Henry Hub - Remaining 2022 | Call Option |
Derivative [Line Items] |
Daily volume (in MMBtu) | MMBTU | 407,925
Weighted average price (in usd per MMBtu or Bbl) | 3.21
NYMEX Henry Hub - 2024 |
Derivative [Line Items] |
Daily volume (in MMBtu) | MMBTU | 234,973
Weighted average price (in usd per MMBtu or Bbl) | 4.26
NYMEX Henry Hub - 2024 | Call Option |
Derivative [Line Items] |
Daily volume (in MMBtu) | MMBTU | 202,000
Weighted average price (in usd per MMBtu or Bbl) | 3.33
NYMEX Henry Hub 2025 |
Derivative [Line Items] |
Daily volume (in MMBtu) | MMBTU | 20,000
Weighted average price (in usd per MMBtu or Bbl) | 4.10
NYMEX Henry Hub 2025 | Call Option |
Derivative [Line Items] |
Daily volume (in MMBtu) | MMBTU | 193,315
Weighted average price (in usd per MMBtu or Bbl) | 5.80
NYMEX WTI - Remaining 2022 |
Derivative [Line Items] |
Daily volume (Bbl/d) | bbl | 3,000
Weighted average price (in usd per MMBtu or Bbl) | $ / bbl | 74.47
Mont Belvieu C3 - Remaining 2022 |
Derivative [Line Items] |
Daily volume (Bbl/d) | bbl | 3,000
Weighted average price (in usd per MMBtu or Bbl) | $ / bbl | 38.07
NYMEX Henry Hub - Remaining 2022 Index1 |
Derivative [Line Items] |
Daily volume (in MMBtu) | MMBTU | 285,000
Weighted average floor price (in usd per MMBtu) | 2.93
Weighted average ceiling price (in usd per MMBtu) | 4.78
NYMEX Henry Hub Index 1 |
Derivative [Line Items] |
Daily volume (in MMBtu) | MMBTU | 180,000
Weighted average floor price (in usd per MMBtu) | 3.43
Weighted average ceiling price (in usd per MMBtu) | 5.49
Basis Swap, Rex Zone 3 - 2022 |
Derivative [Line Items] |
Daily volume (in MMBtu) | MMBTU | 140,000
Weighted average price (in usd per MMBtu or Bbl) | (0.22)
Basis Swap, NGPL TXOK 2023 |
Derivative [Line Items] |
Daily volume (in MMBtu) | MMBTU | 80,000
Weighted average price (in usd per MMBtu or Bbl) | (0.35)
TETCO M2 |
Derivative [Line Items] |
Daily volume (in MMBtu) | MMBTU | 170,145
Weighted average price (in usd per MMBtu or Bbl) | (0.91)
Basis Swap, Rex Zone 3 - 2024 Member |
Derivative [Line Items] |
Daily volume (in MMBtu) | MMBTU | 70,000
Weighted average price (in usd per MMBtu or Bbl) | (0.15)
Basis Swap, NGPL TXOK 2024 |
Derivative [Line Items] |
Daily volume (in MMBtu) | MMBTU | 60,000
Weighted average price (in usd per MMBtu or Bbl) | (0.31)
Basis Swap, TETCO M2 2024 |
Derivative [Line Items] |
Daily volume (in MMBtu) | MMBTU | 69,945
Weighted average price (in usd per MMBtu or Bbl) | (0.89)

X
- Definition The average cap rate on a group of price risk derivatives such as caps or collars. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract. + References No definition available. + Details
Name: | us-gaap_DerivativeAverageCapPrice
Namespace Prefix: | us-gaap_
Data Type: | srt-types:perUnitItemType
Balance Type: | na
Period Type: | instant

X
- Definition The average floor rate on a group of price risk derivatives such as floors or collars. A payment or receipt is triggered if the market rate falls below the floor rate on the contract. + References No definition available. + Details
Name: | us-gaap_DerivativeAverageFloorPrice
Namespace Prefix: | us-gaap_
Data Type: | srt-types:perUnitItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Nominal energy measure used to calculate payments on a derivative instrument. + References No definition available. + Details
Name: | us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:energyItemType
Balance Type: | na
Period Type: | duration

X
- Definition Nominal volume used to calculate payments on a derivative instrument. + References No definition available. + Details
Name: | us-gaap_DerivativeNonmonetaryNotionalAmountVolume
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:volumeItemType
Balance Type: | na
Period Type: | duration

X
- Definition Average fixed price related to the group of price risk swap derivatives. + References No definition available. + Details
Name: | us-gaap_DerivativeSwapTypeAverageFixedPrice
Namespace Prefix: | us-gaap_
Data Type: | srt-types:perUnitItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=gpor_NYMEXHenryHubRemaining2023Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_OptionIndexedToIssuersEquityEquityAxis=us-gaap_CallOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=gpor_NYMEXHenryHub2024Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=gpor_NYMEXHenryHub2025Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=gpor_NYMEXWTIRemaining2023Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=gpor_MontBelvieuC3Remaining2023Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=gpor_NYMEXHenryHubRemaining2023Index1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=gpor_NYMEXHenryHub2024Index1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=gpor_BasisSwapRexZone32023Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=gpor_BasisSwapNGPLTXOK2023Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=gpor_BasisSwapTETCOM22023Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=gpor_BasisSwapRexZone32024Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=gpor_BasisSwapNGPLTXOK2024Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=gpor_BasisSwapTETCOM22024Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |