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Income taxes - Summary of key factors affecting income tax expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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