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Other Assets (Schedule Of Other Assets) (Details) (USD $) | Mar. 31, 2015 | Dec. 31, 2014
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Schedule of Prepaid Expenses [Line Items] |  |
Plugging and abandonment escrow account on the WCBB properties (Note 8) | $ 3,089,000 gpor_PluggingAndAbandonmentEscrowAccount | $ 3,097,000 gpor_PluggingAndAbandonmentEscrowAccount
Certificates of Deposit securing letter of credit | 275,000 gpor_CertificatesOfDepositSecuringLetterOfCredit | 275,000 gpor_CertificatesOfDepositSecuringLetterOfCredit
Prepaid drilling costs | 269,000 gpor_PrepaidDrillingCosts | 483,000 gpor_PrepaidDrillingCosts
Loan commitment fees | 14,771,000 us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums | 15,390,000 us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums
Deposits | 34,000 us-gaap_DepositAssets | 34,000 us-gaap_DepositAssets
Other | 128,000 gpor_OtherAssetsOther | 117,000 gpor_OtherAssetsOther
Other assets | 18,566,000 us-gaap_OtherAssetsNoncurrent | 19,396,000 us-gaap_OtherAssetsNoncurrent
Prepaid Expenses and Other Current Assets [Member] |  |
Schedule of Prepaid Expenses [Line Items] |  |
Prepaid taxes | 12,100,000 us-gaap_PrepaidTaxes / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember |
Prepaid insurance | 2,300,000 us-gaap_PrepaidInsurance / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember |
Prepaid other expenses | $ 1,400,000 us-gaap_OtherPrepaidExpenseCurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember |

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- Definition Certificates of deposit securing letter of credit. + References No definition available. + Details
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- Definition Plugging And Abandonment Escrow Account + References No definition available. + Details
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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 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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- 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 + Details
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- Definition Amount of asset related to consideration paid in advance for insurance that provides economic benefits within a future period of 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 -Glossary Current Assets -URI http://asc.fasb.org/extlink&oid=6509628 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6787-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 10 -Section 05 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=51662447&loc=d3e5879-108316 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 10 -Section 05 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=51662447&loc=d3e5865-108316 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 + Details
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