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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