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Capital Stock and Long-term Retention Plan - Stock awards (Details) - Long-Term Retention Plan EquityInstruments in Thousands | 12 Months Ended
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Dec. 31, 2017 MXN ($) EquityInstruments | Dec. 31, 2016 MXN ($) EquityInstruments | Dec. 31, 2015 MXN ($) EquityInstruments | Dec. 31, 2014 EquityInstruments | Dec. 31, 2013 EquityInstruments
Weighted-Average Exercise Price |  |  |  |  |
Weighted-average remaining contractual life of the awards | 1 year 3 months 11 days | 1 year 3 months 11 days |  |  |
CPOs |  |  |  |  |
CPOs or CPOs Equivalent |  |  |  |  |
Outstanding at beginning of year (in CPOs) | EquityInstruments | 146,293 | 144,250 |  |  |
Conditionally sold (in CPOs) | EquityInstruments | 37,000 | 39,000 | 39,000 | 39,000 | 39,000
Paid by employees (in CPOs) | EquityInstruments | (21,962) | (32,855) |  |  |
Forfeited (in CPOs) | EquityInstruments | (3,416) | (4,102) |  |  |
Outstanding at end of year (in CPOs) | EquityInstruments | 157,915 | 146,293 | 144,250 |  |
To be paid by employees at end of year (in CPOs) | EquityInstruments | 54,274 | 33,693 |  |  |
Weighted-Average Exercise Price |  |  |  |  |
Outstanding at beginning of year (in pesos per CPO) | $ | $ 75.85 | $ 66.60 |  |  |
Conditionally sold (in pesos per CPO) | $ | 85.70 | 85.10 |  |  |
Paid by employees (in pesos per CPO) | $ | 44.89 | 36.84 |  |  |
Forfeited (in pesos per CPO) | $ | 86.40 | 83.16 |  |  |
Outstanding at end of year (in pesos per CPO) | $ | 79.75 | 75.85 | $ 66.60 |  |
To be paid by employees at end of year (in pesos per CPO) | $ | $ 66.75 | $ 46.28 |  |  |

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