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Commitments and contingencies: (Table)
 12 Months Ended
Dec. 31, 2017
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
5,372
 
Between one and three years
 
 
10,745
 
 
 
 
 
 
Total
 
Ps
16,117
 
Disclosure Of Commitments Explanatory [text block]
At December 31, 2016, the investment commitments under this MDP are as follows:
 
Period
 
Amount
 
 
 
 
 
 
2018
 
Ps
340,645
(1)