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Income taxes - Summary of key factors affecting income tax expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]    
Earnings from continuing operations before income tax $ 176,495 $ 113,456
Canadian statutory tax rate 2700.00% 2700.00%
Tax expense on net earnings at Canadian statutory tax rate $ 47,654 $ 30,633
Items that cause an increase (decrease) in income tax expense:    
Foreign income subject to different income tax rates than Canada (20,875) (24,608)
Reduction in Greek income tax rate 0 (7,243)
Turkish investment tax credits (21,669) 0
Québec mineral tax 10,712 63
Non-tax effected operating losses 25,598 16,231
Non-deductible expenses and other items 7,400 13,514
Foreign exchange and other translation adjustments 22,798 13,382
Future and current withholding tax on foreign income dividends 8,705 (5,278)
Other (1,189) 3,077
Income tax expense $ 79,134 $ 39,771