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Deferred income tax (Details 3) - USD ($) $ in Thousands | 12 Months Ended
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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

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