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Stockholders' Equity: (Tables) | 12 Months Ended
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Dec. 31, 2017
Share capital, reserves and other equity interest [Abstract] |
Disclosure of classes of share capital [text block] |
|  | Total shares |  | Capital Stock as of |
|  |  |  |  |  |  |  | December 31, |
Description |  | 2016 |  | 2017 |  | 2016 |  | 2017 |
B Series |  |  | 277,050,000 |  |  | 277,050,000 |  | Ps | 7,173,079 |  | Ps | 7,173,079 |
BB Series |  |  | 22,950,000 |  |  | 22,950,000 |  |  | 594,197 |  |  | 594,197 |
Total |  |  | 300,000,000 |  |  | 300,000,000 |  | Ps | 7,767,276 |  | Ps | 7,767,276 |
Disclosure of detailed information on future tax incentive on dividends [text block] | The incentive is applicable provided that such dividends or profits were generated in 2016 and 2017 and are reinvested in the legal entity that generated such profits. The incentive consists of a tax credit equal to the amount obtained by applying the dividend or utility is distributed, which corresponds to a yearly percentage distribution as follows:
Year of dividend or profit distribution | Percentage applicable to the amount of the dividend or distributed profit (%)
2017 | 1
2018 | 2
2019 onwards | 5

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