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Basis Of Presentation, Description Of Business And Summary Of Significant Accounting Policies (Narrative) (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended
Jul. 01, 2015
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
segment
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Variable Interest Entity [Line Items]                
Asset [1]   $ 1,537,420       $ 1,537,420   $ 1,698,218
Total liabilities   733,865       733,865   832,932
Revenues   424,062   $ 632,350 [2]   1,444,955 $ 1,701,560  
Cost of goods sold   393,933   632,129   $ 1,372,057 1,700,481  
Number of operating segments | segment           4    
Ethanol Production [Member]                
Variable Interest Entity [Line Items]                
Revenues   332,978   484,406 [2]   $ 1,099,245 1,206,182  
Agribusiness and Energy Services [Member]                
Variable Interest Entity [Line Items]                
Revenues   95,428   153,943 [2]   359,108 508,119  
Partnership [Member]                
Variable Interest Entity [Line Items]                
Revenues   21,382   $ 20,154 [2]   62,034 $ 62,066  
Green Plains Partners L.P. [Member]                
Variable Interest Entity [Line Items]                
Asset   87,300       87,300   90,000
Total liabilities   $ 165,100       $ 165,100   $ 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, 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]                
Revenues     $ (30,000)   $ (30,000)      
Cost of goods sold     $ (30,000)   $ (30,000)      
[1] Asset balances by segment exclude intercompany balances
[2] Product revenues, costs of goods sold and selling, general and administrative expenses include certain revenue and expense items which were previously considered intercompany transactions prior to the disposition of GPCC and therefore eliminated upon consolidation. These revenue and costs of goods sold transactions total $5.5 million and $14.5 million for the three and nine months ended September 30, 2019, respectively.