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Income taxes (Schedule of Income Tax Expense (Benefit)) (Details) - MXN ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Major components of tax expense (income) [abstract] |  |  |  |
Expected benefit, expense |  | $ 1,308,828 | $ 890,249 | $ 1,591,129
Increase (decrease) as a result of: |  |  |  |
Inflation effects, net |  | (114,419) | (217,249) | (62,708)
Effect between nominal rate from USA and Mexico |  | (35,914) | (16,572) | 157,366
Benefit from utilization of tax loss carry-forward and others | [1] | (1,238,444) | (115,068) | (1,165,805)
Others, net (includes permanent items) |  | 832,411 | 581,449 | 416,412
Income tax expense |  | $ 752,462 | $ 1,122,809 | $ 936,394
Effective tax rate | [2] | 17.92% | 37.21% | 17.68%
[1] | This amount corresponds to the income tax benefit obtained by those companies that used tax loss carry-forwards in the years presented that were generated previously, less the effect of tax losses incurred by some subsidiaries for which no deferred tax asset was recorded.
[2] | 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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