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Description of the business and summary of significant accounting policies - Employee benefits (Details) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 MXN ($) | Dec. 31, 2015 MXN ($)
Share-based payments |  |  |  |
Termination benefits provision |  | $ 0 | $ 0 | $ 0
Number of days' wages for each year of service provided as seniority premium benefits | 12 days | 12 days |  |
Minimum years of service to receive seniority premium benefits | 15 years | 15 years |  |
Salaries and benefits | $ 143,075 | $ 2,823,647 | 2,419,537 | 1,902,748
Quarterly incentive bonuses |  |  |  |
Share-based payments |  |  |  |
Salaries and benefits |  | 48,384 | 40,829 | 50,558
Short-term benefit plan for certain key personnel |  |  |  |
Share-based payments |  |  |  |
Salaries and benefits |  | 0 | 53,738 | 70,690
Restricted Stock Units |  |  |  |
Share-based payments |  |  |  |
Salaries and benefits |  | 13,508 | 7,816 | 6,018
SARs - cash settled |  |  |  |
Share-based payments |  |  |  |
Salaries and benefits |  |  | 31,743 | 44,699
Salaries and benefits |  | (8,999) |  |
MIP I |  |  |  |
Share-based payments |  |  |  |
Salaries and benefits |  |  |  | 327
MIP II |  |  |  |
Share-based payments |  |  |  |
Salaries and benefits |  |  | 54,357 |
Salaries and benefits |  | (16,499) |  |
Employee profit sharing |  |  |  |
Share-based payments |  |  |  |
Salaries and benefits |  | $ 8,342 | $ 9,967 | $ 9,938

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