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Effect of fluctuations in foreign currency exchange rates (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement [Line Items]      
Conversion foreign exchange gains (losses) recognized in the result of the year. $ (2,169) $ (16,597) $ (1,299)
Gains (losses) on exchange differences on translation, before tax 788 (1,220) (5,446)
Equity attributable to owners of the Parent [member]      
Statement [Line Items]      
Gains (losses) on exchange differences on translation, before tax 562 (1,394) (5,450)
Non-controlling interests [member]      
Statement [Line Items]      
Gains (losses) on exchange differences on translation, before tax $ 226 $ 174 $ 4