XML 21 R52.htm IDEA: XBRL DOCUMENT v2.4.0.6

Subsequent Events (Details)			1 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jul. 31, 2012 New Contract Fixed Price Swap, Period of August 2012 through December 2012	Jul. 31, 2012 New Contract Fixed Price Swap, Period January 2013 through December 2013
Subsequent Event [Line Items]
Daily Volume (Bbls/day)			1,000	3,000
Weighted Average Price	113.20	109.73	99.98	100.04

X

- Definition

Production volume per day in barrels under contract.

+ References

No definition available.

+ Details

Name:	gpor_ProductionBarrelsPerDay
Namespace Prefix:	gpor_
Data Type:	xbrli:decimalItemType
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:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Details

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