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Basis Of Presentation And Description Of Business (Narrative) (Details)
$ in Thousands, lb in Millions, bu in Millions, T in Millions
 3 Months Ended 12 Months Ended
Oct. 01, 2020
USD ($)
Sep. 01, 2019
Dec. 31, 2020
USD ($)
item
state
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
 [2]
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
item
segment
state
T
lb
bu
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Variable Interest Entity [Line Items]                          
Asset [1]     $ 1,578,917       $ 1,698,218       $ 1,578,917 $ 1,698,218  
Total liabilities     802,253       832,932       802,253 832,932  
Revenues     $ 478,764 $ 424,062 $ 388,024 $ 632,869 715,677 $ 632,350 $ 630,570 $ 438,641 $ 1,923,719 2,417,238 $ 2,983,932
Number Of Ethanol Plants | item     12               12    
Number Of Fuel Terminal Facilities | item     6               6    
Number Of Leased Railcars | item                     2,480    
Number of operating segments | segment                     4    
Number Of Ethanol Storage Facilities | item     31               31    
Reduction in other assets $ (69,700)                        
Reduction in accumulated other comprehensive income $ (10,700)                        
Ethanol Production [Member]                          
Variable Interest Entity [Line Items]                          
Revenues                     $ 1,502,581 1,700,715 2,120,661
Number Of Ethanol Plants | item     12               12    
Number of States in which Entity Operates | state     6               6    
Annual Corn Consumption Capacity Bushels | bu                     354.0    
Annual Distillers Grains Production Capacity, Tons | T                     2.5    
Annual Corn Oil Production Pounds | lb                     276    
Agribusiness & Energy Services [Member]                          
Variable Interest Entity [Line Items]                          
Revenues                     $ 443,871 735,500 768,956
Total Grain Storage Capacity | bu                     38.1    
Ethanol Plant Storage Capacity | bu                     30.5    
Grain Elevator Storage Capacity | bu                     7.6    
Number Of Grain Elevators | item                     3    
Green Plains Partners [Member]                          
Variable Interest Entity [Line Items]                          
Revenues                     $ 83,345 82,387 $ 100,748
Number Of Non-Operational Ethanol Production Plant | item                     1    
Number Of Fuel Terminal Facilities | item     6               6    
Number Of Leased Railcars | item                     2,480    
Number Of Ethanol Storage Facilities | item     31               31    
Green Plains Partners L.P. [Member]                          
Variable Interest Entity [Line Items]                          
Asset     $ 91,200       90,000       $ 91,200 90,000  
Total liabilities     $ 151,200       $ 180,900       $ 151,200 $ 180,900  
BioProcess Algae [Member]                          
Variable Interest Entity [Line Items]                          
Less than wholly owned subsidiary, parent ownership percentage                     90.00%    
IPO [Member] | Limited Partner [Member]                          
Variable Interest Entity [Line Items]                          
Ownership interest, percentage                     48.90%    
IPO [Member] | Limited Partner [Member] | Parent Company [Member]                          
Variable Interest Entity [Line Items]                          
Ownership interest, percentage                     49.10%    
Ownership interest, public, percentage                     49.10%    
IPO [Member] | General Partner [Member] | Parent Company [Member]                          
Variable Interest Entity [Line Items]                          
Ownership interest, percentage                     2.00%    
Green Plains Cattle Company LLC [Member]                          
Variable Interest Entity [Line Items]                          
Percent membership interest sold 50.00% 50.00% 50.00%                    
Reduction in other assets $ (69,700)                        
[1] Asset balances by segment exclude intercompany payable and receivable balances
[2] During the third quarter of 2020, the company identified an immaterial issue which resulted in the overstatement of both revenues and cost of goods sold within the agribusiness and energy services segment as previously reported for the three and six months ended June 30, 2020. The second quarter revenues and cost of goods sold reflected in the quarterly financial data have been revised to correct these amounts.