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Debt (Narrative - Food And Ingredients Segment, Partnership Segment, Capitalized Interest, And Restricted Net Assets) (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
property
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
property
Sep. 30, 2017
USD ($)
Jul. 30, 2018
USD ($)
Feb. 19, 2018
USD ($)
Debt Instrument [Line Items]            
Interest expense $ 23,399,000 $ 31,889,000 $ 67,548,000 $ 69,815,000    
Restricted assets 171,200,000   171,200,000      
Food And Ingredients Segment [Member] | Green Plains Cattle [Member] | Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Line of credit, maximum borrowing capacity 500,000,000   500,000,000   $ 425,000,000  
Additional amounts available under facility, accordion feature     100,000,000      
Food And Food Ingredients [Member] | Green Plains Cattle [Member] | Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Additional amounts available under facility, accordion feature     $ 75,000,000      
Minimum working capital required for compliance, percentage     15.00%      
Minimum net worth required for compliance, percentage     20.00%      
Allowable dividends as percentage of net profit before taxes     50.00%      
Annual leverage ratio     3.50      
Annual capital expenditures, maximum     $ 10,000,000      
Annual capital expenditures, maximum, funded by parent     $ 10,000,000      
Food And Food Ingredients [Member] | Green Plains Cattle [Member] | Revolving Credit Facility [Member] | LIBOR [Member]            
Debt Instrument [Line Items]            
Interest rate, basis for effective rate     LIBOR plus 2.00% to 3.00%      
Food And Food Ingredients [Member] | Green Plains Cattle [Member] | Revolving Credit Facility [Member] | Base Rate [Member]            
Debt Instrument [Line Items]            
Interest rate, basis for effective rate     base rate plus 1.00% to 2.00%      
Food And Food Ingredients [Member] | Green Plains Cattle [Member] | Revolving Credit Facility [Member] | Minimum [Member]            
Debt Instrument [Line Items]            
Unused capacity fee, percentage     0.20%      
Food And Food Ingredients [Member] | Green Plains Cattle [Member] | Revolving Credit Facility [Member] | Minimum [Member] | LIBOR [Member]            
Debt Instrument [Line Items]            
Interest rate, basis spread on variable rate, percentage     2.00%      
Food And Food Ingredients [Member] | Green Plains Cattle [Member] | Revolving Credit Facility [Member] | Minimum [Member] | Base Rate [Member]            
Debt Instrument [Line Items]            
Interest rate, basis spread on variable rate, percentage     1.00%      
Food And Food Ingredients [Member] | Green Plains Cattle [Member] | Revolving Credit Facility [Member] | Maximum [Member]            
Debt Instrument [Line Items]            
Unused capacity fee, percentage     0.30%      
Food And Food Ingredients [Member] | Green Plains Cattle [Member] | Revolving Credit Facility [Member] | Maximum [Member] | LIBOR [Member]            
Debt Instrument [Line Items]            
Interest rate, basis spread on variable rate, percentage     3.00%      
Food And Food Ingredients [Member] | Green Plains Cattle [Member] | Revolving Credit Facility [Member] | Maximum [Member] | Base Rate [Member]            
Debt Instrument [Line Items]            
Interest rate, basis spread on variable rate, percentage     2.00%      
Partnership [Member] | Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Line of credit, maximum borrowing capacity 235,000,000   $ 235,000,000      
Partnership [Member] | Green Plains Operating Company LLC [Member] | Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Line of credit, maximum borrowing capacity 235,000,000   235,000,000     $ 195,000,000
Additional amounts available under facility, accordion feature     20,000,000      
Revolving Credit Facility, Increase $ 40,000,000   $ 40,000,000      
Partnership [Member] | Green Plains Operating Company LLC [Member] | Revolving Credit Facility [Member] | LIBOR [Member]            
Debt Instrument [Line Items]            
Interest rate, basis for effective rate     LIBOR plus 2.25% to 3.00%      
Partnership [Member] | Green Plains Operating Company LLC [Member] | Revolving Credit Facility [Member] | Base Rate [Member]            
Debt Instrument [Line Items]            
Interest rate, basis for effective rate     erage ratio at a base rate plus 1.25% to 2.00%      
Partnership [Member] | Green Plains Operating Company LLC [Member] | Revolving Credit Facility [Member] | Minimum [Member]            
Debt Instrument [Line Items]            
Unused capacity fee, percentage     0.35%      
Interest coverage ratio 2.75   2.75      
Partnership [Member] | Green Plains Operating Company LLC [Member] | Revolving Credit Facility [Member] | Minimum [Member] | LIBOR [Member]            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate, basis points     2.25      
Partnership [Member] | Green Plains Operating Company LLC [Member] | Revolving Credit Facility [Member] | Minimum [Member] | Base Rate [Member]            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate, basis points     1.25      
Partnership [Member] | Green Plains Operating Company LLC [Member] | Revolving Credit Facility [Member] | Maximum [Member]            
Debt Instrument [Line Items]            
Unused capacity fee, percentage     0.50%      
Net leverage ratio 3.50   3.50      
Partnership [Member] | Green Plains Operating Company LLC [Member] | Revolving Credit Facility [Member] | Maximum [Member] | LIBOR [Member]            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate, basis points     3.00      
Partnership [Member] | Green Plains Operating Company LLC [Member] | Revolving Credit Facility [Member] | Maximum [Member] | Base Rate [Member]            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate, basis points     2.00      
Collateral Pledged [Member] | Food And Food Ingredients [Member] | Green Plains Cattle [Member] | Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Number of ethanol plants | property 17   17