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Stockholders' Equity: (Details) - MXN ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Number of shares authorised | 300,000,000 | 300,000,000
Issued capital | $ 7,767,276 | $ 7,767,276
B Series [member] |  |
Number of shares authorised | 277,050,000 | 277,050,000
Issued capital | $ 7,173,079 | $ 7,173,079
BB Series [member] |  |
Number of shares authorised | 22,950,000 | 22,950,000
Issued capital | $ 594,197 | $ 594,197

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