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Deferred income tax (Details 3) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of Deferred income tax [Abstract]      
Profit (loss) before income tax $ 92,545 $ (255,237) $ (340,549)
Loss before income tax for discontinued operations (10,098) (19,073) (20,233)
Profit (loss) before income tax 82,447 (274,310) (360,779)
Theoretical loss (gain) for income tax 24,322 (76,807) (101,018)
Effect of translation into U.S. dollars (24,502) (3,012) 42,044
Share in the results of associates (3,896) 102,290 48,545
Mining royalties and special mining tax (1,538) 247 663
Permanent items 16,513 6,577 4,447
Allowance of deferred tax asset 1,898 18,846 13,929
Effect of change in income tax rate net 0 (1,431) 2,347
Income tax expense 12,797 46,710 10,957
Mining Royalties and Special Mining Tax 5,215 6,794 3,806
Total income tax $ 18,012 $ 53,504 $ 14,763