XML 121 R107.htm IDEA: XBRL DOCUMENT
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Share-based payments - Share purchase plan (Details) - Share purchase plan $ in Thousands |  | 1 Months Ended | 12 Months Ended
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Nov. 11, 2014 MXN ($) | Nov. 30, 2017 MXN ($) | Oct. 31, 2016 MXN ($) | Apr. 30, 2016 MXN ($) | Nov. 30, 2014 MXN ($) | Dec. 31, 2017 EquityInstruments shares | Dec. 31, 2016 EquityInstruments shares
Share purchase plan |  |  |  |  |  |  |
Special bonus granted | $ |  |  |  |  | $ 10,831 |  |
Special bonus net of withheld taxes | $ | $ 7,059 |  |  |  |  |  |
Cost of extensions to LTIP approved | $ |  | $ 15,765 | $ 11,599 | $ 14,532 |  |  |
Cost of extensions net of withheld taxes | $ |  | $ 10,108 | $ 7,559 | $ 9,466 |  |  |
Outstanding at beginning of the year | EquityInstruments |  |  |  |  |  | 618,048 | 617,001
Purchased during the year | shares |  |  |  |  |  | 547,310 | 513,002
Exercised/vested during the year | EquityInstruments |  |  |  |  |  | (345,270) | (425,536)
Forfeited during the year | EquityInstruments |  |  |  |  |  |  | (86,419)
Outstanding at end of the year | EquityInstruments |  |  |  |  |  | 820,088 | 618,048

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