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Retained Earnings and Accumulated Other Comprehensive Income - Legal Reserve (Details) - MXN ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Retained Earnings and Accumulated Other Comprehensive Income |  |  |
Increase in legal reserve as a percentage of annual net profits | 5.00% |  |
Threshold increase in legal reserve as a percentage of capital stock | 20.00% |  |
Statutory reserve | $ 2,139,007 | $ 2,139,007 |
Increase in legal reserve as percentage of capital stock | 20.00% |  |
Additional increase in legal reserve as a percentage | 0.00% | 0.00% | 0.00%

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- Definition A component of equity representing reserves created based on legal requirements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Additional increase in legal reserve as a percentage + References No definition available. + Details
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- Definition Increase in legal reserve as a percentage of annual net profits. + References No definition available. + Details
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- Definition Threshold increase in legal reserve as a percentage of capital stock. + References No definition available. + Details
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