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Income taxes - Summary of Factors Affecting Income Tax Expense (Recovery) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Reconciliation of accounting profit multiplied by applicable tax rates [abstract] |  |
Earnings (loss) from continuing operations before income tax | $ 113,456 | $ (466,129)
Canadian statutory tax rate | 27.00% | 27.00%
Tax expense (recovery) on net earnings (loss) at Canadian statutory tax rate | $ 30,633 | $ (125,855)
Items that cause an increase (decrease) in income tax expense: |  |
Foreign income subject to different income tax rates than Canada | (24,608) | (17,498)
Reduction in Greek income tax rate | (7,243) | (24,968)
Non-tax effected operating losses | 16,231 | 12,716
Non-deductible expenses and other items | 13,514 | 14,923
Foreign exchange and other translation adjustments | 13,382 | 36,837
Future and current withholding tax on foreign income dividends | (5,278) | 20,000
Other | 3,140 | (2,653)
Income tax expense (recovery) | $ 39,771 | $ (86,498)

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