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Commitments And Contingencies (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
gal
Trading Activity, Gains and Losses, Net [Line Items]      
Lease expenses $ 31,800,000us-gaap_OperatingLeasesRentExpenseNet $ 19,900,000us-gaap_OperatingLeasesRentExpenseNet $ 18,300,000us-gaap_OperatingLeasesRentExpenseNet
Contracted future deliveries 308,300,000us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted    
Non-monetary settlement requirement     20,000,000gpre_NonMonetarySettlementRequirement
After-tax charge for settlement     2,400,000us-gaap_PaymentsForLegalSettlements
Gain on disposal of assets (4,658,000)gpre_GainOnInsuranceRecovery    
Damages From Preferential Transfers [Member]      
Trading Activity, Gains and Losses, Net [Line Items]      
Damages from transfers     24,400,000us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= gpre_DamagesFromPreferentialTransfersMember
Damages From Fraudulent Transfers [Member]      
Trading Activity, Gains and Losses, Net [Line Items]      
Damages from transfers     28,400,000us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= gpre_DamagesFromFraudulentTransfersMember
Property Damage Portion Of Insurance Claim [Member]      
Trading Activity, Gains and Losses, Net [Line Items]      
Insurance Recoveries 7,800,000us-gaap_InsuranceRecoveries
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= gpre_PropertyDamagePortionOfInsuranceClaimMember
   
Business Interruption Portion Of Insurance Claim [Member]      
Trading Activity, Gains and Losses, Net [Line Items]      
Insurance Recoveries 10,500,000us-gaap_InsuranceRecoveries
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= gpre_BusinessInterruptionPortionOfInsuranceClaimMember
   
Green Plains Otter Tail [Member] | Property Damage Portion Of Insurance Claim [Member]      
Trading Activity, Gains and Losses, Net [Line Items]      
Gain on disposal of assets $ 4,200,000gpre_GainOnInsuranceRecovery
/ dei_LegalEntityAxis
= gpre_GreenPlainsOtterTailMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= gpre_PropertyDamagePortionOfInsuranceClaimMember