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Financial Instruments (Schedule of Book Value of Assets and liabilities Denominated in Foreign Currency) (Details) $ in Thousands, $ in Thousands | Dec. 31, 2018 USD ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 MXN ($)
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Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |
Short - term assets |  | $ 26,100,965 |  | $ 22,866,256
Short - term liabilities |  | 8,992,168 |  | 7,480,069
Currency risk [Member] |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |
Short - term assets |  | 11,649,108 |  | 11,228,846
Short - term liabilities |  | 5,567,083 |  | 4,763,682
Net monetary asset position in foreign currency |  | $ 6,082,025 |  | $ 6,465,164
Currency risk [Member] | USD [Member] |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |
Net monetary asset position in foreign currency | $ 309,414 |  | $ 327,592 |

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- Definition The amount of assets that the entity (a) expects to realise or intends to sell or consume in its normal operating cycle; (b) holds primarily for the purpose of trading; (c) expects to realise within twelve months after the reporting period; or (d) classifies as cash or cash equivalents (as defined in IAS 7) unless the asset is restricted from being exchanged or used to settle a liability for at least twelve months after the reporting period. [Refer: Assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph B12 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_B12_b_i&doctype=Appendix&seq=2 -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_66&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph B10 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_B10_b&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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