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Fair value measurements - Loss gain from financial instruments (Details) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 MXN ($) | Dec. 31, 2015 MXN ($)
(Loss) gain on financial instruments |  |  |  |
Loss from derivatives financial instruments recognized in consolidated statements of operations |  | $ (52,097) | $ (353,943) | $ (287,550)
Net (loss) gain on cash flow hedges recognized in consolidated statements of comprehensive income | $ (2,136) | (42,148) | 624,694 | (193,869)
Foreign currency forward contract |  |  |  |
(Loss) gain on financial instruments |  |  |  |
Loss from derivatives financial instruments recognized in consolidated statements of operations |  | (11,290) |  |
Net (loss) gain on cash flow hedges recognized in consolidated statements of comprehensive income |  | (2,090) |  |
Jet fuel swap contracts |  |  |  |
(Loss) gain on financial instruments |  |  |  |
Loss from derivatives financial instruments recognized in consolidated statements of operations |  |  |  | (128,330)
Jet fuel Asian call options |  |  |  |
(Loss) gain on financial instruments |  |  |  |
Loss from derivatives financial instruments recognized in consolidated statements of operations |  | (26,980) | (305,166) | (112,675)
Net (loss) gain on cash flow hedges recognized in consolidated statements of comprehensive income |  | (54,202) | 583,065 | (221,592)
Interest rate swap contracts |  |  |  |
(Loss) gain on financial instruments |  |  |  |
Loss from derivatives financial instruments recognized in consolidated statements of operations |  | (13,827) | (48,777) | (46,545)
Net (loss) gain on cash flow hedges recognized in consolidated statements of comprehensive income |  | $ 14,144 | $ 41,629 | $ 27,723

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- Definition The gains (losses) resulting from change in the fair value of derivatives recognised in profit or loss. [Refer: Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_85&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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