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Income taxes (Schedule of Tax Losses Pending of Amortize) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 MXN ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Tax losses available | $ 10,772,446 |
2010 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Expiration Date | 2020 |
Tax losses available | $ 18,568 |
2011 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Expiration Date | 2021 |
Tax losses available | $ 9,050,488 | [1]
2012 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Expiration Date | 2022 |
Tax losses available | $ 46 |
2013 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Expiration Date | 2023 |
Tax losses available | $ 81,169 |
2014 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Expiration Date | 2024 |
Tax losses available | $ 38,287 |
2015 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Expiration Date | 2025 |
Tax losses available | $ 38,213 |
2016 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Expiration Date | 2026 |
Tax losses available | $ 239,593 |
2017 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Expiration Date | 2027 |
Tax losses available | $ 721,839 |
2018 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Expiration Date | 2028 |
Tax losses available | $ 584,243 |
[1] | This amount includes $ 9,014,364 corresponding to a tax loss from the sale of shares which, according to the Income Tax Law, can only be applied against taxable profits on the sale of shares generated in the future.

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