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DERIVATIVE INSTRUMENTS (Narrative) (Details)	Sep. 30, 2021 $ / MMBTU
NYMEX
Derivative [Line Items]
Weighted average price (in usd per MMBtu or Bbl)	2.90

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

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_NYMEXMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: