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Income tax - Income tax rates (Details) - MXN ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income tax |  |  |
Corporate income tax rate | 30.00% | 30.00% | 30.00%
Employee wages and benefits tax deductible (as a percent) | 47.00% |  |
Withholding tax on dividends distributions (as a percent) | 10.00% |  |
Consolidated basis tax income | $ 171,046 | $ 2,702,355 | $ 2,751,813
Maximum |  |  |
Income tax |  |  |
Employee wages and benefits tax deductible (as a percent) | 53.00% |  |
Guatemala |  |  |
Income tax |  |  |
Corporate income tax rate | 25.00% | 25.00% |
Costa Rica |  |  |
Income tax |  |  |
Corporate income tax rate | 30.00% | 30.00% |
Period in which tax losses can be carried forward | 3 years |  |
Mexico |  |  |
Income tax |  |  |
Period in which tax losses can be carried forward | 10 years |  |

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- Definition The applicable income tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Amount of consolidated basis tax income (loss) during the period. + References No definition available. + Details
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