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Debt (Schedule Of The Components Of Long-Term Debt) (Details) (USD $) | Dec. 31, 2014 | Dec. 31, 2013 | Jul. 31, 2014 | Aug. 31, 2014
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Debt Instrument [Line Items] |  |  |  |
Total long-term debt | $ 462,905,000 us-gaap_LongTermDebt | $ 563,679,000 us-gaap_LongTermDebt |  |
Less: current portion of long-term debt | (63,465,000)us-gaap_LongTermDebtCurrent | (82,933,000)us-gaap_LongTermDebtCurrent |  |
Long-term Debt, Excluding Current Maturities | 399,440,000 us-gaap_LongTermDebtNoncurrent | 480,746,000 us-gaap_LongTermDebtNoncurrent |  |
Debt instrument amount |  | 22,000,000 us-gaap_DebtInstrumentFaceAmount |  |
Notes Due 2015 [Member] | Convertible Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt |  | 90,000,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = gpre_NotesDue2015Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember |  |
Debt instrument amount | 90,000,000 us-gaap_DebtInstrumentFaceAmount / dei_LegalEntityAxis = gpre_NotesDue2015Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember |  |  |
3.25% Notes due 2018 [Member] | Convertible Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt | 100,845,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = gpre_NotesDue2018Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember | 96,653,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = gpre_NotesDue2018Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember |  |
Debt instrument amount | 120,000,000 us-gaap_DebtInstrumentFaceAmount / dei_LegalEntityAxis = gpre_NotesDue2018Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember |  |  |
Green Plains Bluffton [Member] | Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt |  | 26,621,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = gpre_GreenPlainsBlufftonMember / us-gaap_LongtermDebtTypeAxis = gpre_TermLoanMember |  |
Debt instrument amount | 70,000,000 us-gaap_DebtInstrumentFaceAmount / dei_LegalEntityAxis = gpre_GreenPlainsBlufftonMember / us-gaap_LongtermDebtTypeAxis = gpre_TermLoanMember |  |  |
Green Plains Bluffton [Member] | Revolving Term Loans [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt |  | 15,000,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = gpre_GreenPlainsBlufftonMember / us-gaap_LongtermDebtTypeAxis = gpre_RevolvingTermLoansMember |  |
Debt instrument amount | 20,000,000 us-gaap_DebtInstrumentFaceAmount / dei_LegalEntityAxis = gpre_GreenPlainsBlufftonMember / us-gaap_LongtermDebtTypeAxis = gpre_RevolvingTermLoansMember |  |  |
Green Plains Bluffton [Member] | Revenue Bond [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt |  | 15,780,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = gpre_GreenPlainsBlufftonMember / us-gaap_LongtermDebtTypeAxis = gpre_RevenueBondMember |  |
Debt instrument amount | 22,000,000 us-gaap_DebtInstrumentFaceAmount / dei_LegalEntityAxis = gpre_GreenPlainsBlufftonMember / us-gaap_LongtermDebtTypeAxis = gpre_RevenueBondMember |  |  |
Green Plains Central City [Member] | Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt |  | 33,100,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = gpre_GreenPlainsCentralCityMember / us-gaap_LongtermDebtTypeAxis = gpre_TermLoanMember |  |
Debt instrument amount | 55,000,000 us-gaap_DebtInstrumentFaceAmount / dei_LegalEntityAxis = gpre_GreenPlainsCentralCityMember / us-gaap_LongtermDebtTypeAxis = gpre_TermLoanMember |  |  |
Green Plains Central City [Member] | Revolving Term Loans [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt |  | 17,739,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = gpre_GreenPlainsCentralCityMember / us-gaap_LongtermDebtTypeAxis = gpre_RevolvingTermLoansMember |  |
Debt instrument amount | 30,500,000 us-gaap_DebtInstrumentFaceAmount / dei_LegalEntityAxis = gpre_GreenPlainsCentralCityMember / us-gaap_LongtermDebtTypeAxis = gpre_RevolvingTermLoansMember |  |  |
Green Plains Central City [Member] | Equipment Financing Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt |  | 36,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = gpre_GreenPlainsCentralCityMember / us-gaap_LongtermDebtTypeAxis = gpre_EquipmentFinancingLoanMember |  |
Green Plains Fairmont and Green Plains Wood River [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument amount |  |  | 50,000,000 us-gaap_DebtInstrumentFaceAmount / dei_LegalEntityAxis = gpre_GreenPlainsFairmontAndGreenPlainsWoodRiverMember |
Green Plains Fairmont and Green Plains Wood River [Member] | Tax Increment Financing Bond [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt | 3,589,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = gpre_GreenPlainsFairmontAndGreenPlainsWoodRiverMember / us-gaap_LongtermDebtTypeAxis = gpre_TaxIncrementFinancingBondMember | 3,626,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = gpre_GreenPlainsFairmontAndGreenPlainsWoodRiverMember / us-gaap_LongtermDebtTypeAxis = gpre_TaxIncrementFinancingBondMember |  |
Green Plains Fairmont and Green Plains Wood River [Member] | Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt |  | 26,756,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = gpre_GreenPlainsFairmontAndGreenPlainsWoodRiverMember / us-gaap_LongtermDebtTypeAxis = gpre_TermLoanMember |  |
Debt instrument amount | 27,000,000 us-gaap_DebtInstrumentFaceAmount / dei_LegalEntityAxis = gpre_GreenPlainsFairmontAndGreenPlainsWoodRiverMember / us-gaap_LongtermDebtTypeAxis = gpre_TermLoanMember |  |  |
Green Plains Fairmont and Green Plains Wood River [Member] | Term Loan I [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt | 40,000,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = gpre_GreenPlainsFairmontAndGreenPlainsWoodRiverMember / us-gaap_LongtermDebtTypeAxis = gpre_TermLoanIMember | 50,000,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = gpre_GreenPlainsFairmontAndGreenPlainsWoodRiverMember / us-gaap_LongtermDebtTypeAxis = gpre_TermLoanIMember |  |
Debt instrument amount | 62,500,000 us-gaap_DebtInstrumentFaceAmount / dei_LegalEntityAxis = gpre_GreenPlainsFairmontAndGreenPlainsWoodRiverMember / us-gaap_LongtermDebtTypeAxis = gpre_TermLoanIMember |  |  |
Green Plains Fairmont and Green Plains Wood River [Member] | Equipment Financing Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt | 4,192,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = gpre_GreenPlainsFairmontAndGreenPlainsWoodRiverMember / us-gaap_LongtermDebtTypeAxis = gpre_EquipmentFinancingLoanMember | 5,489,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = gpre_GreenPlainsFairmontAndGreenPlainsWoodRiverMember / us-gaap_LongtermDebtTypeAxis = gpre_EquipmentFinancingLoanMember |  |
Green Plains Fairmont and Green Plains Wood River [Member] | Capital Lease Payable [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt | 9,994,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = gpre_GreenPlainsFairmontAndGreenPlainsWoodRiverMember / us-gaap_LongtermDebtTypeAxis = gpre_CapitalLeasePayableMember | 9,994,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = gpre_GreenPlainsFairmontAndGreenPlainsWoodRiverMember / us-gaap_LongtermDebtTypeAxis = gpre_CapitalLeasePayableMember |  |
Green Plains Holdings II [Member] | Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt | 29,510,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = gpre_GreenPlainsHoldingsTwoMember / us-gaap_LongtermDebtTypeAxis = gpre_TermLoanMember | 15,914,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = gpre_GreenPlainsHoldingsTwoMember / us-gaap_LongtermDebtTypeAxis = gpre_TermLoanMember |  |
Debt instrument amount | 46,800,000 us-gaap_DebtInstrumentFaceAmount / dei_LegalEntityAxis = gpre_GreenPlainsHoldingsTwoMember / us-gaap_LongtermDebtTypeAxis = gpre_TermLoanMember |  |  |
Green Plains Holdings II [Member] | Revolving Term Loans [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt | 6,000,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = gpre_GreenPlainsHoldingsTwoMember / us-gaap_LongtermDebtTypeAxis = gpre_RevolvingTermLoansMember | 31,960,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = gpre_GreenPlainsHoldingsTwoMember / us-gaap_LongtermDebtTypeAxis = gpre_RevolvingTermLoansMember |  |
Debt instrument amount | 20,000,000 us-gaap_DebtInstrumentFaceAmount / dei_LegalEntityAxis = gpre_GreenPlainsHoldingsTwoMember / us-gaap_LongtermDebtTypeAxis = gpre_RevolvingTermLoansMember |  |  |
Green Plains Obion [Member] | Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt |  | 3,879,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = gpre_GreenPlainsObionMember / us-gaap_LongtermDebtTypeAxis = gpre_TermLoanMember |  |
Debt instrument amount | 60,000,000 us-gaap_DebtInstrumentFaceAmount / dei_LegalEntityAxis = gpre_GreenPlainsObionMember / us-gaap_LongtermDebtTypeAxis = gpre_TermLoanMember |  |  |
Green Plains Obion [Member] | Revolving Term Loans [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt | 27,400,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = gpre_GreenPlainsObionMember / us-gaap_LongtermDebtTypeAxis = gpre_RevolvingTermLoansMember | 28,400,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = gpre_GreenPlainsObionMember / us-gaap_LongtermDebtTypeAxis = gpre_RevolvingTermLoansMember |  |
Debt instrument amount | 37,400,000 us-gaap_DebtInstrumentFaceAmount / dei_LegalEntityAxis = gpre_GreenPlainsObionMember / us-gaap_LongtermDebtTypeAxis = gpre_RevolvingTermLoansMember |  |  |
Green Plains Obion [Member] | Equipment Financing Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt |  | 126,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = gpre_GreenPlainsObionMember / us-gaap_LongtermDebtTypeAxis = gpre_EquipmentFinancingLoanMember |  |
Green Plains Obion [Member] | Economic Development Grant [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt | 1,156,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = gpre_GreenPlainsObionMember / us-gaap_LongtermDebtTypeAxis = gpre_EconomicDevelopmentGrantMember | 1,245,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = gpre_GreenPlainsObionMember / us-gaap_LongtermDebtTypeAxis = gpre_EconomicDevelopmentGrantMember |  |
Green Plains Ord [Member] | Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt |  | 15,143,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = gpre_GreenPlainsOrdMember / us-gaap_LongtermDebtTypeAxis = gpre_TermLoanMember |  |
Debt instrument amount | 25,000,000 us-gaap_DebtInstrumentFaceAmount / dei_LegalEntityAxis = gpre_GreenPlainsOrdMember / us-gaap_LongtermDebtTypeAxis = gpre_TermLoanMember |  |  |
Green Plains Ord [Member] | Revolving Term Loans [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt |  | 2,151,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = gpre_GreenPlainsOrdMember / us-gaap_LongtermDebtTypeAxis = gpre_RevolvingTermLoansMember |  |
Debt instrument amount | 13,000,000 us-gaap_DebtInstrumentFaceAmount / dei_LegalEntityAxis = gpre_GreenPlainsOrdMember / us-gaap_LongtermDebtTypeAxis = gpre_RevolvingTermLoansMember |  |  |
Green Plains Processing [Member] | Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt | 213,775,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = gpre_GreenPlainsProcessingMember / us-gaap_LongtermDebtTypeAxis = gpre_TermLoanMember |  |  |
Debt instrument amount | 225,000,000 us-gaap_DebtInstrumentFaceAmount / dei_LegalEntityAxis = gpre_GreenPlainsProcessingMember / us-gaap_LongtermDebtTypeAxis = gpre_TermLoanMember |  |  |
Green Plains Otter Tail [Member] | Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt |  | 17,960,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = gpre_GreenPlainsOtterTailMember / us-gaap_LongtermDebtTypeAxis = gpre_TermLoanMember |  |
Debt instrument amount | 30,300,000 us-gaap_DebtInstrumentFaceAmount / dei_LegalEntityAxis = gpre_GreenPlainsOtterTailMember / us-gaap_LongtermDebtTypeAxis = gpre_TermLoanMember |  |  |
Green Plains Otter Tail [Member] | Note Payable [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt |  | 19,151,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = gpre_GreenPlainsOtterTailMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember |  |
Debt instrument amount | 19,200,000 us-gaap_DebtInstrumentFaceAmount / dei_LegalEntityAxis = gpre_GreenPlainsOtterTailMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember |  |  |
Green Plains Otter Tail [Member] | Equipment Financing Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt | 11,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = gpre_GreenPlainsOtterTailMember / us-gaap_LongtermDebtTypeAxis = gpre_EquipmentFinancingLoanMember |  |  |
Green Plains Shenandoah [Member] | Revolving Term Loans [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt |  | 9,000,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = gpre_GreenPlainsShenandoahMember / us-gaap_LongtermDebtTypeAxis = gpre_RevolvingTermLoansMember |  |
Debt instrument amount | 17,000,000 us-gaap_DebtInstrumentFaceAmount / dei_LegalEntityAxis = gpre_GreenPlainsShenandoahMember / us-gaap_LongtermDebtTypeAxis = gpre_RevolvingTermLoansMember |  |  |
Green Plains Superior [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument amount |  |  |  | 10,000,000 us-gaap_DebtInstrumentFaceAmount / dei_LegalEntityAxis = gpre_GreenPlainsSuperiorMember
Green Plains Superior [Member] | Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt |  | 9,750,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = gpre_GreenPlainsSuperiorMember / us-gaap_LongtermDebtTypeAxis = gpre_TermLoanMember |  |
Debt instrument amount | 40,000,000 us-gaap_DebtInstrumentFaceAmount / dei_LegalEntityAxis = gpre_GreenPlainsSuperiorMember / us-gaap_LongtermDebtTypeAxis = gpre_TermLoanMember |  |  |
Green Plains Superior [Member] | Revolving Term Loans [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt | 15,025,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = gpre_GreenPlainsSuperiorMember / us-gaap_LongtermDebtTypeAxis = gpre_RevolvingTermLoansMember | 8,000,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = gpre_GreenPlainsSuperiorMember / us-gaap_LongtermDebtTypeAxis = gpre_RevolvingTermLoansMember |  |
Debt instrument amount | 15,600,000 us-gaap_DebtInstrumentFaceAmount / dei_LegalEntityAxis = gpre_GreenPlainsSuperiorMember / us-gaap_LongtermDebtTypeAxis = gpre_RevolvingTermLoansMember |  |  |
Green Plains Superior [Member] | Equipment Financing Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt |  | 18,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = gpre_GreenPlainsSuperiorMember / us-gaap_LongtermDebtTypeAxis = gpre_EquipmentFinancingLoanMember |  |
Corporate [Member] | Capital Lease Payable [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt |  | 188,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_CorporateMember / us-gaap_LongtermDebtTypeAxis = gpre_CapitalLeasePayableMember |  |
Corporate [Member] | Other Debt Obligations [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt | $ 11,408,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_CorporateMember / us-gaap_LongtermDebtTypeAxis = us-gaap_OtherDebtSecuritiesMember | $ 10,000,000 us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_CorporateMember / us-gaap_LongtermDebtTypeAxis = us-gaap_OtherDebtSecuritiesMember |  |

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