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Intangible and other long-term assets (Schedule of Reconciliation between Opening and Closing Balances) (Details) - MXN ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of detailed information about intangible assets [line items] |  |
Balance | $ 2,471,548 | $ 2,544,273
Additions |  | (80,131)
Low | (122,487) |
Adjustment effect of the year | (49,009) | 7,406
Balance | 2,300,052 | 2,471,548
Cost [Member] |  |
Disclosure of detailed information about intangible assets [line items] |  |
Balance | 4,841,423 | 4,810,053
Additions | 10,087 | 45,253
Low | (122,487) |
Adjustment effect of the year | (56,520) | (13,883)
Balance | 4,672,503 | 4,841,423
Accumulated amortization [Member] |  |
Disclosure of detailed information about intangible assets [line items] |  |
Balance | (2,369,875) | (2,265,780)
Additions | (10,087) | (125,384)
Adjustment effect of the year | 7,511 | 21,289
Balance | $ (2,372,451) | $ (2,369,875)

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- Definition The increase (decrease) in intangible assets other than goodwill resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2018-01-01 -Paragraph 118 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_118_e_vii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of identifiable non-monetary assets without physical substance. This amount does not include goodwill. [Refer: Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2018-01-01 -Paragraph 118 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_118_e&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_c&doctype=Standard -URIDate 2018-03-16 + Details
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