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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 18, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
May 06, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares or units authorized   4,100,000   4,100,000      
Number of additional shares provided for grants           1,600,000  
Granted, Shares       0 0    
Compensation costs expensed   $ 2.1 $ 2.6 $ 5.7 $ 7.4    
Unrecognized compensation costs   $ 11.7   $ 11.7      
Compensation expected to be recognized, weighted-average period in years       1 year 9 months 18 days      
Potential tax benefit, percentage       24.20%      
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   2,500,000      
Performance Shares [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Non-vested, shares outstanding   517,969   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, Award Vesting Rights, Percentage       50.00%      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       3 years      
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   285,403      
Performance Shares, Predetermined RONA [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, Award Vesting Rights, Percentage       50.00%      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       3 years