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Income taxes - Summary of Income Tax Expense (Recovery) Attributable to Geographical Jurisdiction (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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