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Other Financial Liabilities (debt) (Details 1) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Other Financial Liabilities debt [Line Items] |  |  |
Cash flows from (used in) financing activities | $ (74,052) | $ 59,575 | $ (24,500)
Sociedad Minera El Brocal S.A.A. [Member] |  |  |
Disclosure Of Other Financial Liabilities debt [Line Items] |  |  |
Other financial liabilities | 1,268,488 | 1,996,004 |
Cash flows from (used in) financing activities | (250,000) | (738,260) |
Others change in other financial liabilites | 4,322 | 10,744 |
Other financial liabilities | 1,022,810 | 1,268,488 | 1,996,004
Leases [Member] | Sociedad Minera El Brocal S.A.A. [Member] |  |  |
Disclosure Of Other Financial Liabilities debt [Line Items] |  |  |
Other financial liabilities | 0 | 161 |
Cash flows from (used in) financing activities | 0 | (161) |
Others change in other financial liabilites | 0 | 0 |
Other financial liabilities | 0 | 0 | 161
Senior unsecured credit facility [Member] | Sociedad Minera El Brocal S.A.A. [Member] |  |  |
Disclosure Of Other Financial Liabilities debt [Line Items] |  |  |
Other financial liabilities | 1,280,000 | 1,400,000 |
Cash flows from (used in) financing activities | (250,000) | (120,000) |
Others change in other financial liabilites | 0 | 0 |
Other financial liabilities | 1,030,000 | 1,280,000 | 1,400,000
Shareholder loans [Member] | Sociedad Minera El Brocal S.A.A. [Member] |  |  |
Disclosure Of Other Financial Liabilities debt [Line Items] |  |  |
Other financial liabilities | 0 | 606,014 |
Cash flows from (used in) financing activities |  | (606,014) |
Others change in other financial liabilites |  | 0 |
Other financial liabilities |  | 0 | 606,014
Debt issuance cost [Member] | Sociedad Minera El Brocal S.A.A. [Member] |  |  |
Disclosure Of Other Financial Liabilities debt [Line Items] |  |  |
Other financial liabilities | (11,512) | (10,171) |
Cash flows from (used in) financing activities | 0 | (12,085) |
Others change in other financial liabilites | 4,322 | 10,744 |
Other financial liabilities | $ (7,190) | $ (11,512) | $ (10,171)

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