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Other operating (expense) / income, net - Summary (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Analysis of income and expense [abstract]      
Gain from disposal of farmland and other assets $ 0 $ 2,064 $ 1,354
Loss from the sale of subsidiaries 10 (554) 0
Loss from commodity derivative financial instrument (15,990) (8,320) (618)
(Loss) / gain from disposal of other property items (397) 2,198 (329)
Net (loss) / gain from fair value adjustment of investment property (4,331) 1,077 (325)
Others 1,940 5,522 (904)
Other operating income, net $ (18,768) $ 1,987 $ (822)