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Trade and other payables - Movement of dividends payable (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Trade and other payables      
Beginning balance $ 663 $ 730 $ 1,018
Declared dividends to controlling shareholders, note 17(d) 22,098 22,860 22,099
Dividends paid to controlling shareholders (22,098) (22,860) (22,099)
Declared dividends to non-controlling shareholders 6,500 5,560 6,036
Dividends paid to non-controlling shareholders (6,500) (5,560) (6,036)
Expired dividends (53) (44) (327)
Other minor (6) (23) 39
Final balance $ 604 $ 663 $ 730