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Provisions for other liabilities - Changes in Provisions for Other Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Movement In Other Provisions [Roll Forward]    
Other provisions, beginning balance $ 3,625 $ 4,843
Additions 568 1,147
Used during year (774) (1,379)
Exchange differences (247) (986)
Other provisions, ending balance 3,172 3,625
Labor, legal and other claims    
Movement In Other Provisions [Roll Forward]    
Other provisions, beginning balance 3,620 4,838
Additions 527 1,147
Used during year (774) (1,379)
Exchange differences (247) (986)
Other provisions, ending balance 3,126 3,620
Others    
Movement In Other Provisions [Roll Forward]    
Other provisions, beginning balance 5 5
Additions 41 0
Used during year 0 0
Exchange differences 0 0
Other provisions, ending balance $ 46 $ 5