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Stockholders' Equity: (Details) - MXN ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Number of shares authorised | 7,767,276 | 7,767,276
Issued capital | $ 7,767,276 | $ 7,767,276
B Series [member] |  |
Number of shares authorised | 7,173,079 | 7,173,079
Issued capital | $ 277,050,000 | $ 277,050,000
BB Series [member] |  |
Number of shares authorised | 594,197 | 594,197
Issued capital | $ 22,950,000 | $ 22,950,000

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