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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
Acquisitions And Dispositions [Line Items]
Current assets	$ 910,910us-gaap_AssetsCurrent	$ 633,305us-gaap_AssetsCurrent
Property and equipment, net	825,210us-gaap_PropertyPlantAndEquipmentNet	806,046us-gaap_PropertyPlantAndEquipmentNet
Current liabilities	511,540us-gaap_LiabilitiesCurrent	409,197us-gaap_LiabilitiesCurrent
Long-term debt, net	462,905us-gaap_LongTermDebt	563,679us-gaap_LongTermDebt
Disposed Asset [Member]
Acquisitions And Dispositions [Line Items]
Current assets		146,527us-gaap_AssetsCurrent / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = gpre_DisposedAssetMember
Property and equipment, net		44,640us-gaap_PropertyPlantAndEquipmentNet / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = gpre_DisposedAssetMember
Disposed Liability [Member]
Acquisitions And Dispositions [Line Items]
Current liabilities		92,386us-gaap_LiabilitiesCurrent / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = gpre_DisposedLiabilityMember
Long-term debt, net		$ 27,974us-gaap_LongTermDebt / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = gpre_DisposedLiabilityMember

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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.

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Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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