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Sales - Narrative (Details)
ton in Thousands, megawatt_hour in Thousands, cubic_meter in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
ton
cubic_meter
megawatt_hour
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Contract assets $ 37,965 $ 55,828  
Forward contract      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Contract assets 71,700 $ 63,300 $ 111,800
Forward contract | Soybean      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Contract assets $ 10,300    
Derivative notional amount | ton 71,739    
Forward contract | Wheat      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Contract assets $ 3,100    
Derivative notional amount | ton 18,012    
Forward contract | Corn      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Contract assets $ 13,500    
Derivative notional amount | ton 56,255    
Forward contract | Ethanol      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Contract assets $ 4,800    
Cubic meters of product | cubic_meter 42,125    
Forward contract | Energy      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Contract assets $ 39,000    
MWh of energy | megawatt_hour 649,245