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Mining royalties (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Mining Royalties [Line Items] |  |  |
Royalty Expense | $ 21,526 | $ 31,217 | $ 27,611
Sindicato Minero de Orcopampa S.A., note 29(b) |  |  |
Disclosure Of Mining Royalties [Line Items] |  |  |
Royalty Expense | 12,122 | 20,165 | 19,824
Royalties paid to the Peruvian State |  |  |
Disclosure Of Mining Royalties [Line Items] |  |  |
Royalty Expense | $ 9,404 | $ 11,052 | $ 7,787

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