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Commitments and contingencies: (Table) | 12 Months Ended
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Dec. 31, 2018
Commitments and contingent liabilities [Abstract] |
Disclosure Of Finance Lease And Operating Lease By Lessee Explanatory [text block] | The total minimum future payments derived from the non-cancellable operating lease agreement that shall be covered in the future are as follows:
Up to one year |  | Ps | 5,232 |
Between one and three years |  |  | 10,464 |
Total |  | Ps | 15,696 |
Disclosure Of Commitments Explanatory [text block] | At December 31, 2018, investment commitments for that PMD are as follows:
Period |  | Amount |
2019 |  | Ps | 2,173,764 |
2020 |  |  | 5,108,847 |
2021 |  |  | 3,017,146 |
2022 |  |  | 1,816,852 |
2023 |  |  | 849,799 |
|  | Ps | 12,966,408 | (1)
| (1) | Figures in thousand pesos adjusted at December 31, 2018 based on the Construction Price Index (IPCO) in the terms of the PMD.

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