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Earnings per Share (Tables) | 12 Months Ended
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Dec. 31, 2018
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Summary of Calculations of Earnings per Share | The amounts considered for calculations of earnings per share in 2018, 2017 and 2016, were as follows:
|  | 2018 |  |  | 2017 |  |  | 2016 |
Denominator (thousands of shares) |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average number of shares outstanding1 |  |  | 45,569,180 |  |  |  | 43,107,457 |  |  |  | 42,211,409 |
Capitalization of retained earnings2 |  |  | — |  |  |  | 1,687,295 |  |  |  | 1,687,295 |
Effect of dilutive instruments — mandatorily convertible securities (note 16.2)3 |  |  | 708,153 |  |  |  | 708,153 |  |  |  | 708,153 |
Weighted-average number of shares — basic |  |  | 46,277,333 |  |  |  | 45,502,905 |  |  |  | 44,606,857 |
Effect of dilutive instruments — share-based compensation (note 21)3 |  |  | 316,970 |  |  |  | 237,102 |  |  |  | 226,972 |
Effect of potentially dilutive instruments — optionally convertible securities (note 16.2)3 |  |  | 1,420,437 |  |  |  | 2,698,600 |  |  |  | 3,834,458 |
Weighted-average number of shares — diluted |  |  | 48,014,740 |  |  |  | 48,438,607 |  |  |  | 48,668,287 |
Numerator |  |  |  |  |  |  |  |  |  |  |  |
Net income from continuing operations |  | Ps | 11,044 |  |  |  | 13,180 |  |  |  | 14,491 |
Less: non-controlling interest net income |  |  | 789 |  |  |  | 1,417 |  |  |  | 1,173 |
Controlling interest net income from continuing operations |  |  | 10,255 |  |  |  | 11,763 |  |  |  | 13,318 |
Plus: after tax interest expense on mandatorily convertible securities |  |  | 61 |  |  |  | 91 |  |  |  | 119 |
Controlling interest net income from continuing operations — for basic earnings per share calculations |  |  | 10,316 |  |  |  | 11,854 |  |  |  | 13,437 |
Plus: after tax interest expense on optionally convertible securities |  |  | 436 |  |  |  | 903 |  |  |  | 1,079 |
Controlling interest net income from continuing operations — for diluted earnings per share calculations |  | Ps | 10,752 |  |  |  | 12,757 |  |  |  | 14,516 |
Net income from discontinued operations |  | Ps | 212 |  |  |  | 3,461 |  |  |  | 713 |
Basic earnings per share |  |  |  |  |  |  |  |  |  |  |  |
Controlling interest basic earnings per share |  | Ps | 0.22 |  |  |  | 0.34 |  |  |  | 0.32 |
Controlling interest basic earnings per share from continuing operations |  |  | 0.22 |  |  |  | 0.26 |  |  |  | 0.30 |
Controlling interest basic earnings per share from discontinued operations |  |  | 0.00 |  |  |  | 0.08 |  |  |  | 0.02 |
Diluted earnings per share4 |  |  |  |  |  |  |  |  |  |  |  |
Controlling interest diluted earnings per share |  | Ps | 0.22 |  |  |  | 0.34 |  |  |  | 0.32 |
Controlling interest diluted earnings per share from continuing operations |  |  | 0.22 |  |  |  | 0.26 |  |  |  | 0.30 |
Controlling interest diluted earnings per share from discontinued operations |  |  | 0.00 |  |  |  | 0.08 |  |  |  | 0.02 |
1 | The weighted-average number of shares outstanding in 2017 and 2016 reflects the shares issued as a result of the capitalization of retained earnings declared in March 2017 and March 2016, as applicable (note 20.1).
2 | According to resolution of the Parent Company’s shareholders’ meeting on April 5, 2018. There was no capitalization of retained earnings in 2018.
3 | The number of Parent Company’s CPOs to be issued under the executive share-based compensation programs, as well as the total amount of Parent Company’s CPOs committed for issuance in the future under the mandatorily and optionally convertible securities, are computed from the beginning of the reporting period. The number of shares resulting from the executives’ stock option programs is determined under the inverse treasury method.
4 | For 2018, 2017 and 2016, the effects on the denominator and numerator of potential dilutive shares generate antidilution; therefore, there is no change between the reported basic earnings per share and diluted earnings per share.

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