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Other Assets (Schedule Of Other Assets) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Other Assets, Noncurrent Disclosure [Abstract] |  |
Plugging and abandonment escrow account on the WCBB properties (Note 16) | $ 3,097 gpor_PluggingAndAbandonmentEscrowAccount | $ 3,105 gpor_PluggingAndAbandonmentEscrowAccount
Certificates of Deposit securing letter of credit | 275 gpor_CertificatesOfDepositSecuringLetterOfCredit | 275 gpor_CertificatesOfDepositSecuringLetterOfCredit
Prepaid drilling costs | 483 gpor_PrepaidDrillingCosts | 526 gpor_PrepaidDrillingCosts
Loan commitment fees | 15,390 us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums | 9,341 us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums
Derivative receivable | 0 gpor_DerivativeReceivable | 4,493 gpor_DerivativeReceivable
Deposits | 34 us-gaap_DepositAssets | 34 us-gaap_DepositAssets
Other | 117 gpor_OtherAssetsOther | 77 gpor_OtherAssetsOther
Other assets | $ 19,396 us-gaap_OtherAssetsNoncurrent | $ 17,851 us-gaap_OtherAssetsNoncurrent

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- Definition Certificates of deposit securing letter of credit. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Derivative Receivable + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Other Assets, Other + References No definition available. + Details
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- Definition Plugging And Abandonment Escrow Account + References No definition available. + Details
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Balance Type: | debit
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- Definition Prepaid Drilling Costs + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The carrying amount of the asset transferred to a third party to serve as a deposit, which typically serves as security against failure by the transferor to perform under terms of an agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 8 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8,17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Period Type: | instant

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- Definition Aggregate carrying amount, as of the balance sheet date, of noncurrent assets not separately disclosed in the balance sheet. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + Details
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- Details
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- Definition Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6378536&loc=d3e10092-111533 + Details
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