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Commitments and contingencies: (Details 1) $ in Thousands | Dec. 31, 2018 MXN ($)
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Contractual capital commitments | $ 12,966,408 | [1]
Two Thousand Ninteen [Member] |  |
Contractual capital commitments | 2,173,764 |
Two Thousand Twenty [Member] |  |
Contractual capital commitments | 5,108,847 |
Two Thousand twenty One [Member] |  |
Contractual capital commitments | 3,017,146 |
Two Thousand twenty two [Member] |  |
Contractual capital commitments | 1,816,852 |
Two Thousand twenty three [Member] |  |
Contractual capital commitments | $ 849,799 |
[1] | Figures in thousand pesos adjusted at December 31, 2018 based on the Construction Price Index (IPCO) in the terms of the PMD.

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- Definition The amount of capital commitments for which the entity has entered into a contract. [Refer: Capital commitments] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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