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Related Party Transactions (Narrative) (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) item	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Related Party Transaction [Line Items]
Noncontrolling interests	$ 117,929,000		$ 117,929,000		$ 113,381,000
Outstanding accounts payable	89,566,000		89,566,000		156,693,000
Aircraft Lease [Member]
Related Party Transaction [Line Items]
Outstanding accounts payable	0		0		17,000
Green Plains Cattle [Member]
Related Party Transaction [Line Items]
Amount paid on behalf of third party			1,500,000		$ 2,200,000
Reduction in selling, general and administrative expenses	400,000	$ 100,000	1,200,000	$ 100,000
Revenues and cost of goods sold subsequent to disposition	2,200,000	700,000	8,200,000	700,000
Outstanding receivable	$ 2,000,000.0		$ 2,000,000.0
Green Plains Cattle [Member] | Mr. Ejnar Knudsen [Member] | Indirect Interest By Mr. Ejnar Knudsen [Member]
Related Party Transaction [Line Items]
Indirect ownership interest percentage	0.0736%		0.0736%
Noncontrolling interests	$ 100,000		$ 100,000
Board of Directors Chairman [Member] | Aircraft Lease [Member]
Related Party Transaction [Line Items]
Number of related party transaction agreements | item			2
Number of leased aircrafts | item			2
Aircraft lease amount payable, per month			$ 9,766
Aircraft hours available each year under lease			125 hours
Cash payments	$ 6,000	$ 37,000	$ 30,000	$ 106,000

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