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Segment information - Summary of Operating Segments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Earnings and loss information      
Revenue $ 871,984 $ 940,914  
Production costs 459,586 449,748  
Depreciation and amortization 240,185 200,958  
Earnings (loss) from mine operations 172,213 290,208  
Other significant items of income and expense      
Impairment   13,926  
Write-down (reversal) of assets 32,499 9,106  
Exploration and evaluation expenses 19,635 14,786  
Mine standby costs 34,367 15,351  
Income tax expense (recovery) 61,224 138,073  
Loss from discontinued operations, net of tax (377,485) (155,097)  
Capital expenditure information      
Additions to property, plant and equipment during the period 305,810 292,769  
Information about assets and liabilities      
Property, plant and equipment 3,596,262 4,003,211 $ 4,042,199
Goodwill 92,591 92,591  
Information about assets and liabilities 3,688,853 4,095,802  
Debt, including current portion 494,414 489,763  
Turkiye      
Earnings and loss information      
Revenue 398,602 486,069  
Production costs 193,214 189,841  
Depreciation and amortization 116,076 91,728  
Earnings (loss) from mine operations 89,312 204,500  
Other significant items of income and expense      
Impairment   0  
Write-down (reversal) of assets 33,143 3,442  
Exploration and evaluation expenses 4,180 4,384  
Mine standby costs 0 4  
Income tax expense (recovery) 30,366 93,144  
Loss from discontinued operations, net of tax 0 0  
Capital expenditure information      
Additions to property, plant and equipment during the period 128,797 136,587  
Information about assets and liabilities      
Property, plant and equipment 823,125 841,000  
Goodwill 0 0  
Information about assets and liabilities 823,125 841,000  
Debt, including current portion 0 0  
Canada      
Earnings and loss information      
Revenue 312,962 273,358  
Production costs 116,723 98,987  
Depreciation and amortization 71,974 60,622  
Earnings (loss) from mine operations 124,265 113,749  
Other significant items of income and expense      
Impairment   0  
Write-down (reversal) of assets 0 (2)  
Exploration and evaluation expenses 12,363 7,885  
Mine standby costs 0 714  
Income tax expense (recovery) 31,441 36,622  
Loss from discontinued operations, net of tax 0 0  
Capital expenditure information      
Additions to property, plant and equipment during the period 80,839 89,402  
Information about assets and liabilities      
Property, plant and equipment 711,178 704,663  
Goodwill 92,591 92,591  
Information about assets and liabilities 803,769 797,254  
Debt, including current portion 0 0  
Greece      
Earnings and loss information      
Revenue 160,420 181,487  
Production costs 149,649 160,920  
Depreciation and amortization 52,135 48,608  
Earnings (loss) from mine operations (41,364) (28,041)  
Other significant items of income and expense      
Impairment   13,926  
Write-down (reversal) of assets (1,325) 5,666  
Exploration and evaluation expenses 749 573  
Mine standby costs 34,367 14,633  
Income tax expense (recovery) 13,924 8,307  
Loss from discontinued operations, net of tax 0 0  
Capital expenditure information      
Additions to property, plant and equipment during the period 82,989 59,965  
Information about assets and liabilities      
Property, plant and equipment 2,046,759 2,018,440  
Goodwill 0 0  
Information about assets and liabilities 2,046,759 2,018,440  
Debt, including current portion 0 0  
Romania      
Earnings and loss information      
Revenue 0 0  
Production costs 0 0  
Depreciation and amortization 0 0  
Earnings (loss) from mine operations 0 0  
Other significant items of income and expense      
Impairment   0  
Write-down (reversal) of assets 0 0  
Exploration and evaluation expenses 0 0  
Mine standby costs 0 0  
Income tax expense (recovery) 0 0  
Loss from discontinued operations, net of tax (377,485) (8,295)  
Capital expenditure information      
Additions to property, plant and equipment during the period 0 0  
Information about assets and liabilities      
Property, plant and equipment 0 423,503  
Goodwill 0 0  
Information about assets and liabilities 0 423,503  
Debt, including current portion 0 0  
Brazil      
Earnings and loss information      
Revenue   0  
Production costs   0  
Depreciation and amortization   0  
Earnings (loss) from mine operations   0  
Other significant items of income and expense      
Impairment   0  
Write-down (reversal) of assets   0  
Exploration and evaluation expenses   0  
Mine standby costs   0  
Income tax expense (recovery)   0  
Loss from discontinued operations, net of tax   (146,802)  
Capital expenditure information      
Additions to property, plant and equipment during the period   0  
Information about assets and liabilities      
Property, plant and equipment   0  
Goodwill   0  
Information about assets and liabilities   0  
Debt, including current portion   0  
Other      
Earnings and loss information      
Revenue 0 0  
Production costs 0 0  
Depreciation and amortization 0 0  
Earnings (loss) from mine operations 0 0  
Other significant items of income and expense      
Impairment   0  
Write-down (reversal) of assets 681 0  
Exploration and evaluation expenses 2,343 1,944  
Mine standby costs 0 0  
Income tax expense (recovery) (14,507) 0  
Loss from discontinued operations, net of tax 0 0  
Capital expenditure information      
Additions to property, plant and equipment during the period 13,185 6,815  
Information about assets and liabilities      
Property, plant and equipment 15,200 15,605  
Goodwill 0 0  
Information about assets and liabilities 15,200 15,605  
Debt, including current portion $ 494,414 $ 489,763