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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
May 06, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares or units authorized 5,700,000      
Number of additional shares provided for grants       1,600,000
Number of units granted during period 0 0 0  
Compensation costs expensed $ 6.1 $ 7.9 $ 9.7  
Unrecognized compensation costs $ 9.2      
Compensation expected to be recognized, weighted-average period in years 1 year 10 months 24 days      
Potential tax benefit, percentage 24.30%      
Green Plains Partners Long-Term Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares or units authorized 2,500,000      
Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Non-vested, shares outstanding 486,155 517,969    
Performance Shares [Member] | Share-based Compensation Award, Tranche One [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Target Percentage 100.00%      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized, Achievement of Maximum Goals 917,757      
Share-based Compensation Arrangement by Share-based Payment Award, Achievement of Maximum Goals Percentage 273.00%      
Non-vested, shares outstanding 336,222      
Performance Shares [Member] | Share-based Compensation Award, Tranche Two [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Target Percentage 100.00%      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized, Achievement of Maximum Goals 224,900      
Share-based Compensation Arrangement by Share-based Payment Award, Achievement of Maximum Goals Percentage 150.00%      
Non-vested, shares outstanding 149,933      
Performance Shares [Member] | Share-based Payment Arrangement, Tranche Three [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Target Percentage 75.00%      
Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 8 years      
Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 5 years