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Income taxes - Summary of Income Tax Expense (Recovery) Attributable to Geographical Jurisdiction (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of geographical areas [line items]    
Income tax expense (recovery) $ 39,771 $ (86,498)
Turkey    
Disclosure of geographical areas [line items]    
Income tax expense (recovery) 57,518 45,238
Greece    
Disclosure of geographical areas [line items]    
Income tax expense (recovery) (14,306) (129,213)
Canada    
Disclosure of geographical areas [line items]    
Income tax expense (recovery) (2,727) (3,415)
Romania    
Disclosure of geographical areas [line items]    
Income tax expense (recovery) (1,110) (2,716)
Brazil    
Disclosure of geographical areas [line items]    
Income tax expense (recovery) 249 3,608
Other jurisdictions    
Disclosure of geographical areas [line items]    
Income tax expense (recovery) $ 147 $ 0