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Other Financial Liabilities (debt) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Categories of non-current financial liabilities [abstract] |  |  |
Debt issuance costs | $ (4,126) | $ (3,803) |
Sociedad Minera El Brocal S.A.A. [Member] |  |  |
Categories of non-current financial liabilities [abstract] |  |  |
Senior unsecured credit facility (a) | 1,030,000 | 1,280,000 |
Debt issuance costs | (7,190) | (11,512) |
Total Debt | $ 1,022,810 | $ 1,268,488 | $ 1,996,004

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- Details
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