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Property And Equipment (Schedule Of Components Of Property And Equipment) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Total property and equipment $ 1,099,753us-gaap_PropertyPlantAndEquipmentGross $ 1,021,565us-gaap_PropertyPlantAndEquipmentGross
Less: accumulated depreciation (274,543)us-gaap_PropertyPlantAndEquipmentOwnedAccumulatedDepreciation (215,519)us-gaap_PropertyPlantAndEquipmentOwnedAccumulatedDepreciation
Property and equipment, net 825,210us-gaap_PropertyPlantAndEquipmentNet 806,046us-gaap_PropertyPlantAndEquipmentNet
Plant Equipment [Member]    
Total property and equipment 777,987us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember
749,627us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember
Plant, Buildings And Improvements [Member]    
Total property and equipment 159,178us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= gpre_PlantBuildingsAndImprovementsMember
147,663us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= gpre_PlantBuildingsAndImprovementsMember
Land And Improvements [Member]    
Total property and equipment 73,819us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandAndLandImprovementsMember
59,481us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandAndLandImprovementsMember
Railroad Track And Equipment [Member]    
Total property and equipment 40,882us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_RailroadTransportationEquipmentMember
39,852us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_RailroadTransportationEquipmentMember
Construction-In-Progress [Member]    
Total property and equipment 23,276us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
3,789us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
Computer And Software [Member]    
Total property and equipment 9,305us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= gpre_ComputerAndSoftwareMember
7,380us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= gpre_ComputerAndSoftwareMember
Office Furniture And Equipment [Member]    
Total property and equipment 2,127us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
1,662us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
Leasehold Improvements And Other [Member]    
Total property and equipment $ 13,179us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= gpre_LeaseholdImprovementsAndOtherMember
$ 12,111us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= gpre_LeaseholdImprovementsAndOtherMember