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Debt (Schedule Of Principal Payments Of Long-Term Debt) (Details) (Ethanol Production Segment [Member], Term Loan [Member], USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Green Plains Fairmont and Green Plains Wood River [Member]
  
Debt Instrument [Line Items]  
Scheduled principal payments, periodic $ 1.3us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ dei_LegalEntityAxis
= gpre_GreenPlainsFairmontAndGreenPlainsWoodRiverMember
/ us-gaap_LongtermDebtTypeAxis
= gpre_TermLoanMember
/ us-gaap_StatementBusinessSegmentsAxis
= gpre_EthanolProductionSegmentMember
Green Plains Holdings II [Member]
  
Debt Instrument [Line Items]  
Scheduled principal payments, periodic 1.8us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ dei_LegalEntityAxis
= gpre_GreenPlainsHoldingsTwoMember
/ us-gaap_LongtermDebtTypeAxis
= gpre_TermLoanMember
/ us-gaap_StatementBusinessSegmentsAxis
= gpre_EthanolProductionSegmentMember
Green Plains Processing [Member]
  
Debt Instrument [Line Items]  
Scheduled principal payments, periodic $ 0.6us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ dei_LegalEntityAxis
= gpre_GreenPlainsProcessingMember
/ us-gaap_LongtermDebtTypeAxis
= gpre_TermLoanMember
/ us-gaap_StatementBusinessSegmentsAxis
= gpre_EthanolProductionSegmentMember