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Segment Information (Summary Of Total Assets For Operating Segments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]    
Total assets [1] $ 1,578,917 $ 1,698,218
Operating Segments [Member] | Ethanol Production [Member]    
Segment Reporting Information [Line Items]    
Total assets [1] 852,959 884,293
Operating Segments [Member] | Agribusiness & Energy Services [Member]    
Segment Reporting Information [Line Items]    
Total assets [1] 426,724 410,400
Operating Segments [Member] | Green Plains Partners [Member]    
Segment Reporting Information [Line Items]    
Total assets [1] 91,205 90,011
Intersegment Eliminations [Member]    
Segment Reporting Information [Line Items]    
Total assets [1] (20,045) (10,766)
Corporate, Non-Segment [Member]    
Segment Reporting Information [Line Items]    
Total assets [1] $ 228,074 $ 324,280
[1] Asset balances by segment exclude intercompany payable and receivable balances