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Other operating income, net - Summary (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Analysis of income and expense [abstract]      
Gain from disposal of farmland and other assets (Note 22) $ 1,354 $ 36,227 $ 0
(Loss) / gain from commodity derivative financial instrument (618) 54,694 40,842
Loss from disposal of other property items (329) (95) (986)
Net (loss) / gain from fair value adjustment of investment property (325) 13,409 4,302
Losses related to energy business 0 0 (3,247)
Others (904) (3) 2,852
Other operating income, net $ (822) $ 104,232 $ 43,763