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Investments in associates and joint ventures - Joint venture under IFRS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Investments in associates [Line Items]        
Current assets $ 648,619 $ 761,134    
Non-current assets 3,458,655 3,456,087    
Liabilities 1,139,074 1,187,656 $ 1,269,186  
Shareholders' equity, reported 2,968,200 3,029,565 3,063,627 $ 3,047,213
Net loss from continued operations (28,459) (11,654) $ 64,435  
Joint ventures [member]        
Disclosure of Investments in associates [Line Items]        
Current assets 11,090 17,653    
Non-current assets 100,106 107,175    
Liabilities 88,608 101,575    
Shareholders' equity, reported 22,588 23,253    
Net loss from continued operations $ (665) $ (1,814)