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Investment property (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about investment property [line items]    
Investment property, beginning of period [1] $ 42,342 $ 44,581
Net gain from fair value adjustment (Note 8) 13,409 4,302
Reclassification to property, plant and equipment (i) (3,313) 0
Exchange difference (11,713) (6,541)
Investment property, end of period 40,725 42,342 [1]
Fair value    
Disclosure of detailed information about investment property [line items]    
Investment property, beginning of period 42,342  
Investment property, end of period 40,725 42,342
Fair value | Level 3    
Disclosure of detailed information about investment property [line items]    
Investment property, end of period 40,700  
Increase (decrease) in investment property 4,100  
Cost    
Disclosure of detailed information about investment property [line items]    
Investment property, beginning of period 42,342  
Investment property, end of period $ 40,725 $ 42,342
[1] Prior periods have been recast to reflect the Company's change in accounting policy for Investment properties as in Note 33.