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Effect of fluctuations in foreign currency exchange rates (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement [Line Items]      
Conversion foreign exchange gains (losses) recognized in the result of the year. $ (4,423) $ (2,169) $ (16,597)
Gains (losses) on exchange differences on translation, before tax 14,000 787 (1,220)
Equity attributable to owners of the Parent [member]      
Statement [Line Items]      
Gains (losses) on exchange differences on translation, before tax 14,176 562 (1,394)
Non-controlling interests [member]      
Statement [Line Items]      
Gains (losses) on exchange differences on translation, before tax $ (176) $ 225 $ 174