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Income taxes - Summary of key factors affecting income tax expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Major components of tax expense (income) [abstract]    
Earnings from continuing operations before income tax $ 11,856 $ 157,464
Canadian statutory tax rate 2700.00% 2700.00%
Tax expense on net earnings at Canadian statutory tax rate $ 3,201 $ 42,515
Items that cause an increase (decrease) in income tax expense:    
Foreign income subject to different income tax rates than Canada 1,032 (14,322)
Reduction in Greek income tax rate 0 (11,434)
(Decrease) increase in Turkish income tax rate (4,755) 6,150
Turkish investment tax credits (9,958) (47,394)
Québec mineral tax 12,539 12,089
Non-tax effected operating losses 1,910 9,477
Non-deductible expenses and other items 9,194 33,406
Flow-through share renouncement 4,388 6,397
Impairment and write-down of Stratoni assets 0 13,359
Turkish inflation adjustment exemption benefit (18,048) (10,761)
Foreign exchange related to the weakening of the Turkish Lira 26,619 77,254
Foreign exchange and other translation adjustments 14,079 13,636
Future and current withholding tax on foreign income dividends 19,993 7,655
Other 1,030 46
Income tax expense $ 61,224 $ 138,073