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Components of other comprehensive income (loss) (Details) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 MXN ($) | Dec. 31, 2015 MXN ($)
Derivative financial instruments: |  |  |  |
Reclassification during the year to profit or loss |  | $ 52,097 | $ 353,943 | $ 287,550
Net gain (loss) on cash flow hedges | $ (2,136) | (42,148) | 624,694 | (193,869)
Jet fuel Asian call options |  |  |  |
Derivative financial instruments: |  |  |  |
Gains (losses) on cash flow hedges, before tax |  | (81,182) | 277,899 | (450,768)
Net gain (loss) on cash flow hedges |  | (54,202) | 583,065 | (221,592)
Jet fuel swap contracts |  |  |  |
Derivative financial instruments: |  |  |  |
Gains (losses) on cash flow hedges, before tax |  |  |  | (11,828)
Foreign currency forward contract |  |  |  |
Derivative financial instruments: |  |  |  |
Gains (losses) on cash flow hedges, before tax |  | (13,380) |  |
Interest rate swap contracts |  |  |  |
Derivative financial instruments: |  |  |  |
Gains (losses) on cash flow hedges, before tax |  | 317 | (7,148) | (18,823)
Net gain (loss) on cash flow hedges |  | $ 14,144 | $ 41,629 | $ 27,723

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- Definition The gains (losses) recognised in other comprehensive income on cash flow hedges, before tax. [Refer: Cash flow hedges [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 23 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_23_c&doctype=Standard&book=B -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 91 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_91_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of other comprehensive income, before tax, related to cash flow hedges. [Refer: Cash flow hedges [member]; Other comprehensive income, before tax] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 91 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_91_b&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_7&doctype=Standard -URIDate 2017-03-09 + Details
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