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Income Taxes (Schedule Of Significant Components Of Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Income Taxes [Abstract] |  |
Deferrred tax assets: Net operating loss carryforwards - State | $ 471 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal | $ 1,232 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
Deferrred tax assets: Tax credit carryforwards - Federal |  | 2,062 gpre_DeferredTaxAssetsTaxCreditCarryforwardsDomestic
Deferrred tax assets: Tax credit carryforwards - State | 4,910 gpre_DeferredTaxAssetsTaxCreditCarryforwardsStateAndLocal | 5,662 gpre_DeferredTaxAssetsTaxCreditCarryforwardsStateAndLocal
Deferrred tax assets: Derivative financial instruments | 975 us-gaap_DeferredTaxAssetsDerivativeInstruments | 2,297 us-gaap_DeferredTaxAssetsDerivativeInstruments
Deferred tax assets: Organizational and start-up costs | 851 gpre_DeferredTaxAssetsOrganizationalAndStartUpCosts | 2,371 gpre_DeferredTaxAssetsOrganizationalAndStartUpCosts
Deferrred tax assets: Stock-based compensation | 2,868 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost | 2,975 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Deferred tax assets: Accrued Expenses | 7,196 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities | 7,219 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Deferred tax assets: Capital leases | 3,743 gpre_DeferredTaxAssetsCapitalLeases |
Deferred tax assets: Other | 1,532 us-gaap_DeferredTaxAssetsOther | 1,690 us-gaap_DeferredTaxAssetsOther
Total deferred tax assets | 22,546 us-gaap_DeferredTaxAssetsGross | 25,508 us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities: Convertible Debt | (6,878)us-gaap_DeferredTaxLiabilitiesFinancingArrangements | (8,444)us-gaap_DeferredTaxLiabilitiesFinancingArrangements
Deferred tax liabilities: Fixed assets | (118,132)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | (94,864)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Deferred tax liabilities: Investment in partnerships | (1,534)us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates | (1,786)us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates
Total deferred tax liabilities | (126,544)us-gaap_DeferredIncomeTaxLiabilities | (105,094)us-gaap_DeferredIncomeTaxLiabilities
Valuation allowance | (3,742)us-gaap_DeferredTaxAssetsValuationAllowance | (3,765)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred income taxes | $ (107,740)us-gaap_DeferredTaxAssetsLiabilitiesNet | $ (83,351)us-gaap_DeferredTaxAssetsLiabilitiesNet

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- Definition Amount of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Liability -URI http://asc.fasb.org/extlink&oid=6510232 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph b(2) -Article 7 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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