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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 |  |  |

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