Basis Of Presentation, Description Of Business And Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands			3 Months Ended		6 Months Ended
		Jul. 01, 2015	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Variable Interest Entity [Line Items]
Asset	[1]		$ 1,992,954		$ 1,992,954		$ 1,578,917
Total liabilities			987,724		987,724		802,253
Additional paid-in capital			900,952		900,952		740,889
Retained earnings			53,991		53,991		39,375
Long-term debt			538,619		538,619		287,299
Revenues			724,418	$ 388,024	1,278,058	$ 1,020,893
Cost of goods sold			639,408	360,896	1,148,641	978,124
Ethanol Production [Member]
Variable Interest Entity [Line Items]
Revenues			555,273	290,542	978,995	766,267
Agribusiness and Energy Services [Member]
Variable Interest Entity [Line Items]
Revenues			173,487	100,491	307,431	263,680
Partnership [Member]
Variable Interest Entity [Line Items]
Revenues			19,701	20,381	40,107	40,652
Green Plains Partners L.P. [Member]
Variable Interest Entity [Line Items]
Asset			92,400		92,400		91,200
Total liabilities			$ 105,400		$ 105,400		151,200
IPO [Member] | Limited Partner [Member]
Variable Interest Entity [Line Items]
Ownership interest, public, percentage		49.10%
IPO [Member] | Limited Partner [Member] | Parent Company [Member]
Variable Interest Entity [Line Items]
Ownership interest, percentage		48.90%
IPO [Member] | General Partner [Member] | Parent Company [Member]
Variable Interest Entity [Line Items]
Ownership interest, percentage		2.00%
Restatement Adjustment [Member]
Variable Interest Entity [Line Items]
Additional paid-in capital							(49,500)
Retained earnings							11,400
Long-term debt							38,100
Debt principal offset							39,400
Debt issuance costs							$ 1,300
Revision of Prior Period, Error Correction, Adjustment [Member]
Variable Interest Entity [Line Items]
Revenues				(30,000)		(30,000)
Cost of goods sold				$ (30,000)		$ (30,000)

[1] Asset balances by segment exclude intercompany balances.