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Other Financial Liabilities (debt) - Additional information (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Mar. 31, 2014 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Other Financial Liabilities debt [Line Items] |  |  |  |  |
Repayments of borrowings, classified as financing activities |  |  | $ 7,197 | $ 95,000 | $ 95,000
Write off debt issuance costs |  |  | 900 |  |
Extinguishment debt issuance cost |  |  |  | 1,300 | 1,900
Senior unsecured credit facility [Member] |  |  |  |  |
Disclosure Of Other Financial Liabilities debt [Line Items] |  |  |  |  |
Borrowings | $ 1,500,000 |  |  |  |
Repayments of borrowings, classified as financing activities |  |  | 975,000 | 305,000 |
Increased in Credit Facility | $ 225,000 |  |  |  |
Interest expense |  |  | $ 22,400 | 39,100 | $ 49,600
Citi bank [Member] | Senior unsecured credit facility [Member] |  |  |  |  |
Disclosure Of Other Financial Liabilities debt [Line Items] |  |  |  |  |
Notional amount |  | $ 1,800,000 |  |  |
Term of credit facility |  | 5 years |  |  |
Sociedad Minera El Brocal S.A.A |  |  |  |  |
Disclosure Of Other Financial Liabilities debt [Line Items] |  |  |  |  |
Borrowings, interest rate basis |  |  | Interest on the credit facility is based on the 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. |  |
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 (fully repaid as of December 31, 2020), 15% due on June 30, 2021 (fully repaid as of December 31, 2020), 35% due on December 31, 2021 (fully repaid as of December 31, 2020) and 35% due on June 19, 2022 (US$525 million). |  |
Write off debt issuance costs |  |  | $ 1,700 | 1,800 |
Extinguishment debt issuance cost |  |  | $ 900 | $ 1,300 |

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