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Equity - Earnings per share (Details) $ / shares in Units, $ / shares in Units, shares in Thousands, $ in Thousands, $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Apr. 19, 2017 MXN ($) | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2017 MXN ($) $ / shares shares | Dec. 31, 2016 MXN ($) $ / shares shares | Dec. 31, 2015 MXN ($) $ / shares shares | Dec. 31, 2017 MXN ($)
Equity |  |  |  |  |  |
Net (loss) income for the period |  | $ (30,129) | $ (594,599) | $ 3,519,489 | $ 2,463,870 |
Weighted average number of shares outstanding (in thousands): |  |  |  |  |  |
Basic |  | 1,011,877 | 1,011,877 | 1,011,877 | 1,011,877 |
Diluted |  | 1,011,877 | 1,011,877 | 1,011,877 | 1,011,877 |
LPS - EPS: |  |  |  |  |  |
Basic | (per share) |  | $ (0.030) | $ (0.588) | $ 3.478 | $ 2.435 |
Diluted | (per share) |  | $ (0.030) | $ (0.588) | $ 3.478 | $ 2.435 |
Legal reserve |  | $ 14,754 |  | $ 38,250 |  | $ 291,178
Legal reserve as a percent of capital stock |  | 9.80% |  |  |  | 9.80%
Amount allocated to legal reserve | $ | $ 252,928 |  |  |  |  |
Withholding tax on dividends distributions (as a percent) |  | 10.00% | 10.00% |  |  |

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