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

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- Definition Gain on property and equipment insurance recovery. + References No definition available. + Details
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- Definition Non Monetary Settlement Requirement + References No definition available. + Details
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- Definition The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The value (monetary amount) of the award the plaintiff seeks in the legal matter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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- Definition The amount of cash paid for the settlement of litigation or for other legal issues during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.25) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 25 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 17 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.17) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a)(19)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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