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Tax situation (Details 5) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Deferred tax assets [Abstract] |  |  |
Deferred tax assets | $ 43,129 | $ 25,881 |
Deferred tax liabilitiy [Abstract] |  |  |
Deferred tax liabilities | 15,790 | 12,330 |
Sociedad Minera Cerro Verde S.A.A. [Member] |  |  |
Deferred tax assets [Abstract] |  |  |
Deferred tax assets | 164,100 | 25,035 | $ 24,271
Deferred tax liabilitiy [Abstract] |  |  |
Deferred tax liabilities | 328,215 | 356,691 | 274,487
Deferred tax liabilities before supplementary retirement fund | 164,115 | 331,656 | 250,216
Supplementary Retirement Fund [Abstract] |  |  |
Supplementary retirement fund, deferred liability | 1,890 | 3,458 | 2,937
Net deferred tax liabilities | 166,005 | 335,114 | 253,153
Sociedad Minera Cerro Verde S.A.A. [Member] | Provision for remediation and mine closure,deferred tax assets [Member] |  |  |
Deferred tax assets [Abstract] |  |  |
Deferred tax assets | 12,083 | 9,180 | 5,638
Sociedad Minera Cerro Verde S.A.A. [Member] | Unpaid vacations,deferred tax assets [Member] |  |  |
Deferred tax assets [Abstract] |  |  |
Deferred tax assets | 5,293 | 4,055 | 2,515
Sociedad Minera Cerro Verde S.A.A. [Member] | Provision for mining taxes,deferred tax assets [Member] |  |  |
Deferred tax assets [Abstract] |  |  |
Deferred tax assets | 8,742 | 4,003 | 1,505
Sociedad Minera Cerro Verde S.A.A. [Member] | Cost of net asset for construction of tailing dam,deferred tax assets [Member] |  |  |
Deferred tax assets [Abstract] |  |  |
Deferred tax assets | 2,007 | 2,321 | 1,682
Sociedad Minera Cerro Verde S.A.A. [Member] | Development costs,deferred tax assets [Member] |  |  |
Deferred tax assets [Abstract] |  |  |
Deferred tax assets | 183 | 228 | 332
Sociedad Minera Cerro Verde S.A.A. [Member] | Price adjustment of copper concentrates and cathode,deferred tax assets [Member] |  |  |
Deferred tax assets [Abstract] |  |  |
Deferred tax assets | 0 | 0 | 7,849
Sociedad Minera Cerro Verde S.A.A. [Member] | Other provisions,deferred tax assets [Member] |  |  |
Deferred tax assets [Abstract] |  |  |
Deferred tax assets | 4,240 | 5,248 | 4,750
Sociedad Minera Cerro Verde S.A.A. [Member] | Difference in depreciation method,deferred tax liabilities [Member] |  |  |
Deferred tax liabilitiy [Abstract] |  |  |
Deferred tax liabilities | 261,434 | 283,882 | 245,670
Sociedad Minera Cerro Verde S.A.A. [Member] | Difference in valuation of inventories,deferred tax liabilities [Member] |  |  |
Deferred tax liabilitiy [Abstract] |  |  |
Deferred tax liabilities | 16,264 | 25,087 | 10,997
Sociedad Minera Cerro Verde S.A.A. [Member] | Price adjustment of copper concentrates and cathode,deferred tax liabilities [Member] |  |  |
Deferred tax liabilitiy [Abstract] |  |  |
Deferred tax liabilities | 25,840 | 24,128 | 0
Sociedad Minera Cerro Verde S.A.A. [Member] | Stripping activity asset,deferred tax liabilities [Member] |  |  |
Deferred tax liabilitiy [Abstract] |  |  |
Deferred tax liabilities | 22,014 | 23,594 | 17,820
Sociedad Minera Cerro Verde S.A.A. [Member] | Debt issuance costs , deferred tax liabilities [Member] |  |  |
Deferred tax liabilitiy [Abstract] |  |  |
Deferred tax liabilities | 2,663 | 0 | 0
Sociedad Minera Cerro Verde S.A.A. [Member] | Royalty accrual, deferred tax assets [Member] |  |  |
Deferred tax assets [Abstract] |  |  |
Deferred tax assets | 127,475 | 0 | 0
Sociedad Minera Cerro Verde S.A.A. [Member] | SUNAT Assessments, deferred tax assets [Member] |  |  |
Deferred tax assets [Abstract] |  |  |
Deferred tax assets | $ 4,077 | $ 0 | $ 0

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