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Trade and other payables (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of Trade and other payables [Abstract]      
Beginning balance $ 1,018 $ 1,044 $ 1,117
Declared dividends to controlling shareholders, note 17(d) 22,099 7,621 0
Dividends paid to controlling shareholders (22,099) (7,621) 0
Declared dividends to non-controlling shareholders 6,036 7,400 10,488
Dividends paid to non-controlling shareholders (6,036) (7,400) (10,488)
Expired dividends (327) (30) (4)
Other minor 39 4 (69)
Final balance $ 730 $ 1,018 $ 1,044