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Acquisitions and Dispositions (Schedule Of Disposed Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Acquisitions And Dispositions [Line Items] |  |
Current assets | $ 910,910 us-gaap_AssetsCurrent | $ 633,305 us-gaap_AssetsCurrent
Property and equipment, net | 825,210 us-gaap_PropertyPlantAndEquipmentNet | 806,046 us-gaap_PropertyPlantAndEquipmentNet
Current liabilities | 511,540 us-gaap_LiabilitiesCurrent | 409,197 us-gaap_LiabilitiesCurrent
Long-term debt, net | 462,905 us-gaap_LongTermDebt | 563,679 us-gaap_LongTermDebt
Disposed Asset [Member] |  |
Acquisitions And Dispositions [Line Items] |  |
Current assets |  | 146,527 us-gaap_AssetsCurrent / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = gpre_DisposedAssetMember
Property and equipment, net |  | 44,640 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = gpre_DisposedAssetMember
Disposed Liability [Member] |  |
Acquisitions And Dispositions [Line Items] |  |
Current liabilities |  | 92,386 us-gaap_LiabilitiesCurrent / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = gpre_DisposedLiabilityMember
Long-term debt, net |  | $ 27,974 us-gaap_LongTermDebt / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = gpre_DisposedLiabilityMember

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + 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 210.5-02.9) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6801-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 9 -Article 5 + Details
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