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Equity - Authorized shares and secondary follow-on equity offering (Details) - MXN ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 16, 2015 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016
Equity |  |  |  |
Par value |  |  | $ 0 | $ 0
Number of authorized shares |  |  | 1,011,876,677 | 1,011,876,677
Treasury shares |  |  | (13,257,945) | (13,175,905)
Shares fully subscribed and paid |  |  | 998,618,732 | 998,700,772
Equity transaction costs |  | $ 22,955 |  |
Series A shares |  |  |  |
Equity |  |  |  |
Number of authorized shares |  |  | 877,856,206 | 877,856,206
Series B shares |  |  |  |
Equity |  |  |  |
Number of authorized shares |  |  | 134,020,471 | 134,020,471
Ordinary Participation Certificates |  |  |  |
Equity |  |  |  |
Number of shares sold by shareholders | 108,900,000 |  |  |
Number of shares sold by the Company | 0 |  |  |
Fixed Class I |  |  |  |
Equity |  |  |  |
Number of authorized shares |  |  | 24,180 | 24,180
Shares fully subscribed and paid |  |  | 24,180 | 24,180
Fixed Class I | Series A shares |  |  |  |
Equity |  |  |  |
Number of authorized shares |  |  | 3,224 | 3,224
Fixed Class I | Series B shares |  |  |  |
Equity |  |  |  |
Number of authorized shares |  |  | 20,956 | 20,956
Variable Class II |  |  |  |
Equity |  |  |  |
Number of authorized shares |  |  | 1,011,852,497 | 1,011,852,497
Treasury shares |  |  | (13,257,945) | (13,175,905)
Shares fully subscribed and paid |  |  | 998,594,552 | 998,676,592
Variable Class II | Series A shares |  |  |  |
Equity |  |  |  |
Number of authorized shares |  |  | 877,852,982 | 877,852,982
Variable Class II | Series B shares |  |  |  |
Equity |  |  |  |
Number of authorized shares |  |  | 133,999,515 | 133,999,515

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