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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 18, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
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   $ 7.9 $ 9.7 $ 11.4  
Unrecognized compensation costs   $ 9.6      
Compensation expected to be recognized, weighted-average period in years   1 year 8 months 12 days      
Potential tax benefit, percentage   24.00%      
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   517,969 285,403    
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 641,823        
Share-based Compensation Arrangement by Share-based Payment Award, Achievement of Maximum Goals Percentage 276.00%        
Non-vested, shares outstanding 232,566        
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   428,104      
Share-based Compensation Arrangement by Share-based Payment Award, Achievement of Maximum Goals Percentage   150.00%      
Non-vested, shares outstanding   285,403      
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