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Segment information - Summary of Operating Segments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Earnings and loss information      
Revenue $ 940,914 $ 1,026,685  
Production costs 449,748 445,183  
Depreciation and amortization 200,958 218,084  
Earnings (loss) from mine operations 290,208 363,418  
Other significant items of income and expense      
Reversal of impairment 13,926    
Write-down (reversal) of assets 9,106 38,660  
Exploration and evaluation expenses 18,314 12,493  
Income tax expense 139,970 82,361  
Net loss from discontinued operations, net of tax 146,802 6,352  
Capital expenditure information      
Additions to property, plant and equipment during the period 292,769 198,424  
Information about assets and liabilities      
Property, plant and equipment 4,003,211 4,042,199 $ 4,091,252
Goodwill 92,591 92,591  
Information about assets and liabilities 4,095,802 4,134,790  
Debt, including current portion 489,763 501,132  
Turkey      
Earnings and loss information      
Revenue 486,069 588,188  
Production costs 189,841 201,895  
Depreciation and amortization 91,728 96,469  
Earnings (loss) from mine operations 204,500 289,824  
Other significant items of income and expense      
Reversal of impairment 0    
Write-down (reversal) of assets 3,442 209  
Exploration and evaluation expenses 4,384 2,192  
Income tax expense 93,144 68,793  
Net loss from discontinued operations, net of tax 0 0  
Capital expenditure information      
Additions to property, plant and equipment during the period 136,587 88,894  
Information about assets and liabilities      
Property, plant and equipment 841,000 789,186  
Goodwill 0 0  
Information about assets and liabilities 841,000 789,186  
Debt, including current portion 0 0  
Canada      
Earnings and loss information      
Revenue 273,358 257,267  
Production costs 98,987 78,309  
Depreciation and amortization 60,622 70,335  
Earnings (loss) from mine operations 113,749 108,623  
Other significant items of income and expense      
Reversal of impairment 0    
Write-down (reversal) of assets (2) 0  
Exploration and evaluation expenses 7,885 2,978  
Income tax expense 36,622 28,412  
Net loss from discontinued operations, net of tax 0 0  
Capital expenditure information      
Additions to property, plant and equipment during the period 89,402 59,832  
Information about assets and liabilities      
Property, plant and equipment 704,663 596,081  
Goodwill 92,591 92,591  
Information about assets and liabilities 797,254 688,672  
Debt, including current portion 0 0  
Greece      
Earnings and loss information      
Revenue 181,487 181,230  
Production costs 160,920 164,979  
Depreciation and amortization 48,608 51,280  
Earnings (loss) from mine operations (28,041) (35,029)  
Other significant items of income and expense      
Reversal of impairment 13,926    
Write-down (reversal) of assets 5,666 40,030  
Exploration and evaluation expenses 573 592  
Income tax expense 8,307 (8,763)  
Net loss from discontinued operations, net of tax 0 0  
Capital expenditure information      
Additions to property, plant and equipment during the period 59,965 42,638  
Information about assets and liabilities      
Property, plant and equipment 2,018,440 2,027,612  
Goodwill 0 0  
Information about assets and liabilities 2,018,440 2,027,612  
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      
Reversal of impairment 0    
Write-down (reversal) of assets 0 (1,579)  
Exploration and evaluation expenses 3,528 4,987  
Income tax expense 1,897 (6,081)  
Net loss from discontinued operations, net of tax 0 0  
Capital expenditure information      
Additions to property, plant and equipment during the period 0 6  
Information about assets and liabilities      
Property, plant and equipment 423,503 414,118  
Goodwill 0 0  
Information about assets and liabilities 423,503 414,118  
Debt, including current portion 0 0  
Brazil      
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      
Reversal of impairment 0    
Write-down (reversal) of assets 0 0  
Exploration and evaluation expenses 0 0  
Income tax expense 0 0  
Net loss from discontinued operations, net of tax 146,802 6,352  
Capital expenditure information      
Additions to property, plant and equipment during the period 0 0  
Information about assets and liabilities      
Property, plant and equipment 0 205,432  
Goodwill 0 0  
Information about assets and liabilities 0 205,432  
Debt, including current portion 0 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      
Reversal of impairment 0    
Write-down (reversal) of assets 0 0  
Exploration and evaluation expenses 1,944 1,744  
Income tax expense 0 0  
Net loss from discontinued operations, net of tax 0 0  
Capital expenditure information      
Additions to property, plant and equipment during the period 6,815 7,054  
Information about assets and liabilities      
Property, plant and equipment 15,605 9,770  
Goodwill 0 0  
Information about assets and liabilities 15,605 9,770  
Debt, including current portion $ 489,763 $ 501,132