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Income taxes - Summary of Factors Affecting Income Tax Expense (Recovery) (Details) - USD ($)
$ in Thousands
 12 Months Ended
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)