XML 63 R77.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

SUBSEQUENT EVENTS (Details) bbl in Thousands | 1 Months Ended
--- | ---
Oct. 31, 2019 MMBTU $ / MMBTU bbl | Dec. 31, 2018 MMBTU $ / MMBTU
2019 |  |
Subsequent Event [Line Items] |  |
Daily volume (in MMBtu) |  | 100,000
Weighted average price (in usd per MMBtu or Bbl) | $ / MMBTU |  | 3.05
2019 | Subsequent Event |  |
Subsequent Event [Line Items] |  |
Daily Volume (Bbls/day) | bbl | 1 |
Daily volume (in MMBtu) | 120,000 |
2020 | Subsequent Event |  |
Subsequent Event [Line Items] |  |
Daily volume (in MMBtu) | 28,000 |
Weighted average price (in usd per MMBtu or Bbl) | $ / MMBTU | 2.85 |

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: | num: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: | num: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
- 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
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | gpor_PositionMaturityAxis=gpor_FixedPriceSwap2019Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | gpor_PositionMaturityAxis=gpor_FixedPriceSwap2020Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |