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Cash and cash equivalents: (Tables) | 12 Months Ended
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Dec. 31, 2017
Cash and Cash Equivalents [Abstract] |
Disclosure of detailed information about cash and cash equivalents [text block] |
| December 31, |
|  | 2016 |  | 2017 |
Cash and cash held at banks |  | Ps | 3,142,810 |  | Ps | 4,417,791 |
Short term investments |  |  | 354,825 |  |  | 240,701 |
Fiduciary rights (*) |  |  |  |  |  | 18,962 |
Total cash and cash equivalents |  | Ps | 3,497,635 |  | Ps | 4,677,454 |
(*) Corresponds to the Airplan Fiduciary's agreement 2875, signed with Fiduciaria Bancolombia to administer the resources of the concession contract. See Notes 8.2 and 18.5.

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