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Cash and cash equivalents: (Tables) | 12 Months Ended
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Dec. 31, 2019
Cash and cash equivalents |
Schedule of cash and cash equivalents |
|  | December 31,
|  | 2018 |  | 2019
Cash and cash held at banks |  | Ps. | 3,743,212 |  | Ps. | 3,642,037
Short term investments |  |  | 841,295 |  |  | 2,550,642
Total cash and cash equivalents |  | Ps. | 4,584,507 |  | Ps. | 6,192,679

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