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Contingencies and restrictions (Details) $ in Thousands | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
--- | --- | --- | --- | ---
Disclosure of contingent liabilities [line items] |  |  |  |
Equity | $ 2,247,468 | $ 2,307,272 | $ 2,400,356 | $ 2,292,515
Soc. Comercial el Mimbral [Member] |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |
Equity | $ 2,247,468 | $ 2,307,272 |  |
Net debt to earnings before interest depreciation and amortization ratio | 0.27 | 0.58 |  |
Financial leverage ratio | 0.91 | 0.83 |  |
Debt to net current assets ratio | 0.03 | 0.02 |  |

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