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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
Income Taxes [Abstract]    
Deferrred tax assets: Net operating loss carryforwards - State $ 471us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal $ 1,232us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
Deferrred tax assets: Tax credit carryforwards - Federal   2,062gpre_DeferredTaxAssetsTaxCreditCarryforwardsDomestic
Deferrred tax assets: Tax credit carryforwards - State 4,910gpre_DeferredTaxAssetsTaxCreditCarryforwardsStateAndLocal 5,662gpre_DeferredTaxAssetsTaxCreditCarryforwardsStateAndLocal
Deferrred tax assets: Derivative financial instruments 975us-gaap_DeferredTaxAssetsDerivativeInstruments 2,297us-gaap_DeferredTaxAssetsDerivativeInstruments
Deferred tax assets: Organizational and start-up costs 851gpre_DeferredTaxAssetsOrganizationalAndStartUpCosts 2,371gpre_DeferredTaxAssetsOrganizationalAndStartUpCosts
Deferrred tax assets: Stock-based compensation 2,868us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 2,975us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Deferred tax assets: Accrued Expenses 7,196us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 7,219us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Deferred tax assets: Capital leases 3,743gpre_DeferredTaxAssetsCapitalLeases  
Deferred tax assets: Other 1,532us-gaap_DeferredTaxAssetsOther 1,690us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 22,546us-gaap_DeferredTaxAssetsGross 25,508us-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