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Financial risk management - Derivative Contracts (Details)
ton in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
ton
Dec. 31, 2018
USD ($)
ton
Disclosure of detailed information about financial instruments [line items]    
Tons of biological asset | ton 101,839 216,195
Notional amount $ 37,965 $ 55,828
Fair Value Asset/ (Liability) (166) 6,032
Loss/(Gain) $ 50 $ 12,885
Corn | Futures    
Disclosure of detailed information about financial instruments [line items]    
Tons of biological asset | ton 221 (97)
Notional amount $ 923 $ (14,791)
Fair Value Asset/ (Liability) 445 (209)
Loss/(Gain) $ (446) $ (209)
Soybean | Futures    
Disclosure of detailed information about financial instruments [line items]    
Tons of biological asset | ton 107 25
Notional amount $ 7,118 $ 8,089
Fair Value Asset/ (Liability) 759 527
Loss/(Gain) $ (687) $ 177
Wheat | Futures    
Disclosure of detailed information about financial instruments [line items]    
Tons of biological asset | ton 13 (14)
Notional amount $ 515 $ (2,483)
Fair Value Asset/ (Liability) (28) (11)
Loss/(Gain) $ 28 $ (85)
Sugar | Futures    
Disclosure of detailed information about financial instruments [line items]    
Tons of biological asset | ton 101,498 208,837
Notional amount $ 29,409 $ 64,753
Fair Value Asset/ (Liability) (1,342) 5,483
Loss/(Gain) $ 1,155 $ 12,765
Sugar | Buy put    
Disclosure of detailed information about financial instruments [line items]    
Tons of biological asset | ton   6,326
Notional amount   $ 128
Fair Value Asset/ (Liability)   267
Loss/(Gain)   $ 393
Sugar | Sell call    
Disclosure of detailed information about financial instruments [line items]    
Tons of biological asset | ton   1,118
Notional amount   $ 132
Fair Value Asset/ (Liability)   (25)
Loss/(Gain)   $ (156)