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Financial Instrument at fair value (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2008 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Available For Sale Financial Assets [Line Items] |  |  |  |
Change in fair value of the investments in marketable stocks |  | $ (207) | $ 821 |
Minera Yanacocha SRL and subsidiary [Member] |  |  |  |
Disclosure Of Available For Sale Financial Assets [Line Items] |  |  |  |
Purchase of available-for-sale financial assets | $ 13,000 |  |  |
Non-current financial assets available-for-sale |  | 25,168 | 24,417 |
Other comprehensive income, net of tax, financial assets measured at fair value through other comprehensive income |  | $ 123 | $ 1,246 | $ 91

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