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Dispositions And Discontinued Operations (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 01, 2019
Sep. 30, 2020
Sep. 30, 2020
Business Acquisition [Line Items]      
Gain on disposal of assets   $ 2,000,000 $ 2,000,000
Green Plains Cattle Company LLC [Member]      
Business Acquisition [Line Items]      
Consideration paid for business acquisition $ 76,900,000    
Gain on disposal of assets $ 0    
Percent membership interest sold 50.00%