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Deferred income tax - Reconciliation of tax expense and the accounting profit (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Deferred income tax      
Profit (loss) before income tax $ (43,535) $ 27,033 $ 92,667
Loss for discontinued operations (10,514) (11,808) (10,344)
Profit (loss) before income tax (54,049) 15,225 82,323
Theoretical loss (gain) for income tax 15,944 (4,491) (24,285)
Effect of translation into U.S. dollars 14,995 (15,248) 24,502
Share in the results of associates 14,074 (337) 3,896
Permanent items (9,958) (3,466) (16,549)
Unrecognized deferred tax asset (9,265) (2,038) (1,898)
Mining royalties and special mining tax (24) 3,118 1,538
Income tax expense 25,766 (22,462) (12,796)
Mining Royalties and Special Mining Tax (176) (4,417) (5,092)
Total income tax $ (25,590) $ 26,879 $ 17,888