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Other Financial Liabilities (debt) (Details Textual) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2017 | Jun. 27, 2016 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2014
Disclosure Of Other Financial Liabilities debt [Line Items] |  |  |  |  |  |  |
Notional amount |  | $ 275,000,000 |  | $ 275,000,000 | $ 275,000,000 |  |
Borrowings |  |  |  | $ 272,575,000 | 271,881,000 |  |
Borrowings, interest rate basis |  | Three-month Libor plus 3% |  |  |  |  |
Description of amortization of credit facility |  |  |  | The credit facility calls for amortization in four installments, with 15% of the total facility due on December 31, 2020 (US$5.0 million after the December 2017 repayment), 15% due on June 30, 2021 (US$225 million), 35% due on December 31, 2021 (US$525 million) and 35% due on June 19, 2022 (US$525 million). |  |  |
Repayments of borrowings, classified as financing activities |  |  |  | $ 300,000,000 | $ 442,957,000 | $ 90,000,000 |
Write off debt issuance costs |  |  |  | 4,300,000 |  |  |
Issuance costs related to debt extinguishment |  |  |  | 2,000,000 |  |  |
Senior unsecured credit facility [Member] |  |  |  |  |  |  |
Disclosure Of Other Financial Liabilities debt [Line Items] |  |  |  |  |  |  |
Borrowings | $ 1,500,000,000 |  |  | 1,300,000,000 |  |  |
Repayments of borrowings, classified as financing activities |  |  | $ 525,000,000 | $ 220,000,000 |  |  |
Increased in Credit Facility | $ 225,000,000 |  |  |  |  |  |
Citi bank [Member] | Senior unsecured credit facility [Member] |  |  |  |  |  |  |
Disclosure Of Other Financial Liabilities debt [Line Items] |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  | $ 1,800,000,000
Citi bank [Member] | Term loan [Member] |  |  |  |  |  |  |
Disclosure Of Other Financial Liabilities debt [Line Items] |  |  |  |  |  |  |
Borrowings, interest rate basis |  |  |  | Interest on the credit facility is based on London Interbank Offered Rate (LIBOR) plus a spread (currently 1.9%) based on the Companys total net debt to earnings before interest, taxes, depreciation and amortization (EBITDA) ratio, as defined in the agreement. |  |  |
Sociedad Minera El Brocal S.A.A. [Member] | Citi bank [Member] |  |  |  |  |  |  |
Disclosure Of Other Financial Liabilities debt [Line Items] |  |  |  |  |  |  |
Borrowings, interest rate basis |  |  |  | Interest on the credit facility is based on London Interbank Offered Rate (LIBOR) plus a spread (currently 1.9%) based on the Company´s total net debt to earnings before interest, taxes, depreciation and amortization (EBITDA) ratio, as defined in the agreement. |  |  |

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