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Sales - Narrative (Details)
megawatt_hour in Thousands, cubic_meter in Thousands, T in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
cubic_meter
megawatt_hour
T
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Contract assets $ 72,299 $ 37,965  
Forward contract      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Contract assets 42,200 $ 71,700 $ 63,300
Forward contract | Soybean      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Contract assets $ 2,500    
Derivative notional amount | T 9,045    
Forward contract | Wheat      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Contract assets $ 3,100    
Derivative notional amount | T 15,517    
Forward contract | Corn      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Contract assets $ 3,400    
Derivative notional amount | T 23,242    
Forward contract | Ethanol      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Contract assets $ 1,700    
Cubic meters of product | cubic_meter 3,419    
Forward contract | Energy      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Contract assets $ 30,300    
MWh of energy | megawatt_hour 698,868