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Intangible assets (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2018
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Intangible assets, net $ 27,909,000 $ 17,192,000 [1] $ 17,252,000 [1]  
Adjustment of opening net book amount for the application of IAS 29   208,178,000   $ 657,000
Impairment loss 0 0 0  
IAS 29        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Adjustment of opening net book amount for the application of IAS 29       252,588,000
Goodwill        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Intangible assets, net 21,350,000 12,412,000 13,405,000  
Exchange differences (6,616,000) (993,000)    
Additions 0 0    
Amortisation, intangible assets other than goodwill 0 0    
Goodwill | IAS 29        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Adjustment of opening net book amount for the application of IAS 29       15,554,000
Goodwill | Cost        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Intangible assets, net 21,350,000 12,412,000 13,405,000  
Goodwill | Accumulated amortization        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Intangible assets, net 0 0 0  
Software        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Intangible assets, net 5,597,000 3,851,000 2,901,000  
Exchange differences (1,139,000) (244,000)    
Additions 3,217,000 2,089,000    
Amortisation, intangible assets other than goodwill (1,168,000) (895,000)    
Software | IAS 29        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Adjustment of opening net book amount for the application of IAS 29       836,000
Software | Cost        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Intangible assets, net 10,163,000 7,251,000 5,406,000  
Software | Accumulated amortization        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Intangible assets, net (4,566,000) (3,400,000) (2,505,000)  
Others        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Intangible assets, net 962,000 929,000 946,000  
Exchange differences (20,000) (10,000)    
Additions 105,000 34,000    
Amortisation, intangible assets other than goodwill (52,000) (41,000)    
Others | IAS 29        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Adjustment of opening net book amount for the application of IAS 29       0
Others | Cost        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Intangible assets, net 2,781,000 2,695,000 2,671,000  
Others | Accumulated amortization        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Intangible assets, net (1,819,000) (1,766,000) (1,725,000)  
Intangible assets        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Intangible assets, net 27,909,000 17,192,000 17,252,000  
Exchange differences (7,775,000) (1,247,000)    
Additions 3,322,000 2,123,000    
Amortisation, intangible assets other than goodwill (1,220,000) (936,000)    
Intangible assets | IAS 29        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Adjustment of opening net book amount for the application of IAS 29       $ 16,390,000
Intangible assets | Cost        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Intangible assets, net 34,294,000 22,358,000 21,482,000  
Intangible assets | Accumulated amortization        
Reconciliation of changes in intangible assets other than goodwill [abstract]        
Intangible assets, net $ (6,385,000) $ (5,166,000) $ (4,230,000)  
[1] Prior periods have been recast to reflect the Company's change in accounting policy for Investment properties as in Note 33.