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Investment property (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about investment property [line items]    
Investment property, beginning of period $ 2,666 $ 4,796
Reclassification to property, plant and equipment 0 (1,335)
Exchange difference (395) (795)
Investment property, end of period 2,271 2,666
Fair value | Level 3    
Disclosure of detailed information about investment property [line items]    
Investment property, beginning of period 45,000  
Investment property, end of period 42,000 45,000
Cost    
Disclosure of detailed information about investment property [line items]    
Investment property, beginning of period 2,666  
Investment property, end of period 2,271 2,666
Accumulated amortization    
Disclosure of detailed information about investment property [line items]    
Investment property, beginning of period 0  
Investment property, end of period $ 0 $ 0