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Property, plant and equipment (Schedule of Net Book Value of Property, Plant and Equipment) (Details) - MXN ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net Book Value | $ 16,737,595 | $ 16,970,832 | $ 15,737,081
Land [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net Book Value | 1,291,000 | 1,217,000 | 1,094,000
Buildings [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net Book Value | 4,056,000 | 3,625,000 | 3,743,000
Machinery and equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net Book Value | 6,489,000 | 7,187,000 | 7,331,000
Transportation equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net Book Value | 76,000 | 78,000 | 78,000
Furniture, mixtures and computer Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net Book Value | 64,000 | 64,000 | 57,000
Constructions and machinery in-progress [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net Book Value | $ 4,761,000 | $ 4,800,000 | $ 3,434,000

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2019-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_e&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Details
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- Details
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- Details
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