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Other operating income, net (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of operating segments [line items]      
Gain from disposal of farmland and other assets (Note 21) $ 0 $ 0 $ 7,914
Gain /(Loss) from commodity derivative financial instrument 40,842 (16,007) 22,148
(Loss) /Gain from disposal of other property items (986) (1,255) 721
Settlement agreement (Note 29) 0 8,489 0
Profit / (Loss) for the year (3,247)    
Others 2,852 476 283
Other operating income, net $ 39,461 (8,297) 31,066
Energy      
Disclosure of operating segments [line items]      
Profit / (Loss) for the year   $ 0 $ 0