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Investments in associates and joint venture - Joint venture under IFRS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Investments in associates [Line Items]        
Current assets $ 589,152 $ 648,619    
Non-current assets 3,390,465 3,458,655    
Liabilities 1,179,760 1,139,074 $ 1,187,656  
Current liabilities 360,436 565,357    
Shareholders' equity, reported 2,799,857 2,968,200 3,029,565 $ 3,063,627
Income tax expense or income 25,430 (25,590) 26,879  
Net loss from continued operations (150,339) (28,459) (11,654)  
Share in results (9,517) 47,710 $ (1,144)  
Joint ventures [member]        
Disclosure of Investments in associates [Line Items]        
Current assets 12,946 11,090    
Non-current assets 93,847 100,106    
Liabilities 87,005 88,608    
Shareholders' equity, reported 19,788 22,588    
Group's interest 2,254 2,627    
Revenue 20,571 24,521    
Interest income   101    
Interest expense (5,252) (5,694)    
Income tax expense or income 311 186    
Net loss from continued operations (2,800) (665)    
Share in results $ (252) $ (44)