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Commitments and contingencies: (Table)
 12 Months Ended
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.