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Segment information - Summary of Operating Segments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Earnings and loss information      
Revenue $ 617,823 $ 459,016  
Production costs 334,839 269,445  
Depreciation and amortization 153,118 105,732  
Earnings from mine operations 129,866 83,839  
Other significant items of income and expense      
Reversal of impairment (96,914) 447,808  
Write-down of assets 6,298 447,808  
Exploration and evaluation expenses 14,643 33,842  
Income tax expense (recovery) 39,771 (86,498)  
Capital expenditure information      
Additions to property, plant and equipment during the period 181,103 328,153  
Capitalized interest 3,848 36,750  
Information about assets and liabilities      
Property, plant and equipment 4,088,202 3,988,476 $ 4,227,397
Goodwill 92,591 92,591  
Information about assets and liabilities 4,180,793 4,081,067  
Debt, including current portion 479,732 595,977  
Turkey      
Earnings and loss information      
Revenue 352,385 348,528  
Production costs 137,080 174,081  
Depreciation and amortization 63,949 75,854  
Earnings from mine operations 151,356 98,593  
Other significant items of income and expense      
Reversal of impairment (85,224)    
Write-down of assets 105 117,570  
Exploration and evaluation expenses 2,593 840  
Income tax expense (recovery) 57,518 45,238  
Capital expenditure information      
Additions to property, plant and equipment during the period 62,887 68,737  
Capitalized interest 0 0  
Information about assets and liabilities      
Property, plant and equipment 791,354 721,449  
Goodwill 0 0  
Information about assets and liabilities 791,354 721,449  
Debt, including current portion 0 0  
Canada      
Earnings and loss information      
Revenue 125,282 0  
Production costs 50,733 0  
Depreciation and amortization 47,659 0  
Earnings from mine operations 26,890 0  
Other significant items of income and expense      
Reversal of impairment 0    
Write-down of assets 0 0  
Exploration and evaluation expenses 1,905 103  
Income tax expense (recovery) (2,727) (3,415)  
Capital expenditure information      
Additions to property, plant and equipment during the period 75,328 189,867  
Capitalized interest 3,848 13,160  
Information about assets and liabilities      
Property, plant and equipment 606,274 582,895  
Goodwill 92,591 92,591  
Information about assets and liabilities 698,865 675,486  
Debt, including current portion 0 0  
Greece      
Earnings and loss information      
Revenue 140,156 110,488  
Production costs 147,026 95,364  
Depreciation and amortization 41,510 29,424  
Earnings from mine operations (48,380) (14,300)  
Other significant items of income and expense      
Reversal of impairment 0    
Write-down of assets 6,177 330,238  
Exploration and evaluation expenses 3,223 15,947  
Income tax expense (recovery) (14,305) (129,213)  
Capital expenditure information      
Additions to property, plant and equipment during the period 39,349 61,716  
Capitalized interest 0 23,590  
Information about assets and liabilities      
Property, plant and equipment 2,067,719 2,063,798  
Goodwill 0 0  
Information about assets and liabilities 2,067,719 2,063,798  
Debt, including current portion 0 0  
Romania      
Earnings and loss information      
Revenue 0 0  
Production costs 0 0  
Depreciation and amortization 0 0  
Earnings from mine operations 0 0  
Other significant items of income and expense      
Reversal of impairment 0    
Write-down of assets 16 0  
Exploration and evaluation expenses 4,887 13,499  
Income tax expense (recovery) (1,110) (2,716)  
Capital expenditure information      
Additions to property, plant and equipment during the period 24 419  
Capitalized interest 0 0  
Information about assets and liabilities      
Property, plant and equipment 415,150 416,197  
Goodwill 0 0  
Information about assets and liabilities 415,150 416,197  
Debt, including current portion 0 0  
Brazil      
Earnings and loss information      
Revenue 0 0  
Production costs 0 0  
Depreciation and amortization 0 0  
Earnings from mine operations 0 0  
Other significant items of income and expense      
Reversal of impairment (11,690)    
Write-down of assets 0 0  
Exploration and evaluation expenses 381 1,728  
Income tax expense (recovery) 249 3,608  
Capital expenditure information      
Additions to property, plant and equipment during the period 3,476 6,612  
Capitalized interest 0 0  
Information about assets and liabilities      
Property, plant and equipment 204,419 203,075  
Goodwill 0 0  
Information about assets and liabilities 204,419 203,075  
Debt, including current portion 0 0  
Other      
Earnings and loss information      
Revenue 0 0  
Production costs 0 0  
Depreciation and amortization 0 454  
Earnings from mine operations 0 (454)  
Other significant items of income and expense      
Reversal of impairment 0    
Write-down of assets 0 0  
Exploration and evaluation expenses 1,654 1,725  
Income tax expense (recovery) 146 0  
Capital expenditure information      
Additions to property, plant and equipment during the period 39 802  
Capitalized interest 0 0  
Information about assets and liabilities      
Property, plant and equipment 3,286 1,062  
Goodwill 0 0  
Information about assets and liabilities 3,286 1,062  
Debt, including current portion $ 479,732 $ 595,977