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Share-based payments - Vesting period of shares granted under share purchase plan (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 MXN ($) EquityInstruments | Dec. 31, 2016 MXN ($) EquityInstruments | Dec. 31, 2015 MXN ($) EquityInstruments
Share-based payments |  |  |
Compensation expense recorded in the consolidated statement of operations | $ | $ 13,508 | $ 7,816 | $ 6,345
Share purchase plan |  |  |
Share-based payments |  |  |
Shares outstanding | 820,088 | 618,048 | 617,001
Compensation expense recorded in the consolidated statement of operations | $ | $ 13,508 | $ 7,816 | $ 6,018
Forfeited during the year |  | (86,419) |
Share purchase plan | Vesting / Exercisable within one year |  |  |
Share-based payments |  |  |
Shares outstanding | 353,457 |  |
Share purchase plan | Vesting / Exercisable within two years |  |  |
Share-based payments |  |  |
Shares outstanding | 284,200 |  |
Share purchase plan | Vesting / Exercisable within three years |  |  |
Share-based payments |  |  |
Shares outstanding | 182,431 |  |

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of expense arising from equity-settled share-based payment transactions in which the goods or services received did not qualify for recognition as assets. [Refer: Expense from share-based payment transactions in which goods or services received did not qualify for recognition as assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 51 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_51_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The number of other equity instruments (ie other than share options) forfeited in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The number of other equity instruments (ie other than share options) outstanding in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45&doctype=Standard -URIDate 2017-03-09 + Details
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