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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Mar. 19, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares or units authorized 4,110,000   4,110,000    
Compensation costs expensed $ 3.0 $ 3.0 $ 5.4 $ 5.5  
Unrecognized compensation costs $ 17.0   $ 17.0    
Compensation expected to be recognized, weighted-average period in years     2 years 1 month 6 days    
Potential tax benefit, percentage     24.40%    
Green Plains Partners LP 2015 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]          
Number of shares or units authorized 153,030   153,030    
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     229,545    
Share-based Compensation Arrangement by Share-based Payment Award, Achievement of Maximum Goals Percentage     150.00%    
Monte Carlo valuation assumed pecercentage of the performance shares awarded at end of performance period based upon the estimated company’s total shareholder return relative to peer performance     97.39%    
Share Price         $ 18.15
Unrecognized compensation costs $ 2.5   $ 2.5    
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, Award Vesting Period     3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     50.00%    
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 Period     3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     50.00%