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Stockholders' Equity: (Details Textual) - MXN ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Apr. 26, 2017 | Dec. 31, 2016 | Apr. 26, 2016
Issued capital | $ 7,767,276 |  | $ 7,767,276 |
Number of shares authorised | 7,767,276 |  | 7,767,276 |
Legal Reserve, Percentage of Allocation from Net Income | 5.00% |  |  |
Capital redemption reserve | $ 7,052,635 |  | $ 5,045,254 |
Dividend payables |  | $ 1,848,000 |  | $ 1,683,000
Dividend Declared, Tax on Dividends, Percentage | 42.85% |  |  |
Retained earnings | $ 9,949,654 |  | 8,155,159 |
Additional paid-in capital | $ 39,689,426 |  | 37,172,825 |
Tax rate Withholding Tax on Dividends | 10.00% |  |  |
Capital Stock Issued And Outstanding Reserve | 20.00% |  |  |
Fixed Capital Shares [member] |  |  |  |
Issued capital | $ 1,000 |  | 1,000 |
Retained earnings |  |  | 6,114,939 |
Variable Capital Shares [member] |  |  |  |
Issued capital | 7,766,276 |  | $ 7,766,276 |
Retained earnings | $ 8,951,912 |  |  |

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