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Segment Information (Summary Of Total Assets For Operating Segments) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]    
Total assets $ 1,828,557us-gaap_Assets $ 1,532,045us-gaap_Assets
Ethanol Production [Member]    
Segment Reporting Information [Line Items]    
Total assets 983,289us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= gpre_EthanolProductionMember
911,315us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= gpre_EthanolProductionMember
Corn Oil Production [Member]    
Segment Reporting Information [Line Items]    
Total assets 31,405us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= gpre_CornOilProductionMember
28,569us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= gpre_CornOilProductionMember
Agribusiness [Member]    
Segment Reporting Information [Line Items]    
Total assets 234,626us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= gpre_AgribusinessMember
165,570us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= gpre_AgribusinessMember
Marketing And Distribution [Member]    
Segment Reporting Information [Line Items]    
Total assets 305,675us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= gpre_MarketingAndDistributionMember
258,361us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= gpre_MarketingAndDistributionMember
Corporate Assets [Member]    
Segment Reporting Information [Line Items]    
Total assets 290,123us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= gpre_CorporateAssetsMember
175,210us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= gpre_CorporateAssetsMember
Intersegment Eliminations [Member]    
Segment Reporting Information [Line Items]    
Total assets $ (16,561)us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_IntersegmentEliminationMember
$ (6,980)us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_IntersegmentEliminationMember