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Cost of sales (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of cost of sales [Line Items] |  |  |
Administrative expenses | $ 83,597 | $ 81,692 | $ 84,372
Sociedad Minera Cerro Verde S.A.A. [Member] |  |  |
Disclosure of cost of sales [Line Items] |  |  |
Increase decrease in labor costs related to profit sharing | 86,400 | 36,800 | 1,600
Administrative expenses | $ 0 | $ 0 | $ 0

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