XML 71 R56.htm IDEA: XBRL DOCUMENT
v3.19.2

DERIVATIVE INSTRUMENTS (Net (Loss) Gain on Derivative Instruments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Derivative [Line Items] |  |  |  |
Net gain (loss) on natural gas, oil, and NGLs derivatives | $ 171,140 | $ (70,545) | $ 151,095 | $ (87,074)
Natural gas derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Net gain (loss) on natural gas, oil, and NGLs derivatives | 152,475 | (31,194) | 136,044 | (40,890)
Oil derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Net gain (loss) on natural gas, oil, and NGLs derivatives | 11,871 | (24,419) | 11,417 | (33,566)
NGL derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Net gain (loss) on natural gas, oil, and NGLs derivatives | $ 6,794 | $ (14,932) | $ 3,634 | $ (12,618)

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 Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
Name: | us-gaap_GainLossOnDerivativeInstrumentsNetPretax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | srt_EnergyAxis=gpor_GasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_EnergyAxis=srt_OilReservesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_EnergyAxis=srt_NaturalGasReservesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |