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Deferred income tax (Details 3) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Deferred income tax [Abstract]      
Profit (loss) before income tax $ 22,475 $ 92,545 $ (255,237)
Loss for discontinued operations (7,203) (10,098) (19,073)
Profit (loss) before income tax 15,272 82,447 (274,400)
Theoretical loss (gain) for income tax 4,505 24,322 (76,807)
Effect of translation into U.S. dollars 15,248 (24,502) (3,012)
Permanent items 3,492 16,513 6,577
Allowance of deferred tax asset 2,038 1,898 18,846
Share in the results of associates 337 (3,896) 102,290
Mining royalties and special mining tax (3,118) (1,538) 247
Effect of change in income tax rate net 0 0 (1,431)
Income tax expense 22,502 12,797 46,710
Mining Royalties and Special Mining Tax 4,424 5,215 6,794
Total income tax $ 26,926 $ 18,012 $ 53,504