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Financial risk management: (Tables)
 12 Months Ended
Dec. 31, 2017
Financial risk management [Abstract]  
Disclosure of effect of changes in foreign exchange rates [text block]
At December 31, 2016 and 2017, the Company is exposed to exchange rate risk for monetary position, as shown below:
 
 
 
December 31,
 
 
 
2016
 
2017
 
 
 
 
 
 
 
 
 
Monetary position:
 
 
 
 
 
 
 
Asset
 
USD
188,765
 
USD
50,905
 
Liability
 
 
218,125
 
 
148,417
 
 
 
 
 
 
 
 
 
 
 
USD
(29,360)
 
USD
(97,512)
 
Disclosure of maturity analysis for non-derivative financial liabilities [text block]
The amounts presented in the table reflect the undiscounted cash flows, including contractual interest.
 
 
 
Under
 
Between 3 months
 
Between 1
 
Between 2 and
 
At December 31, 2017
 
3 months
 
and one year
 
and 2 years
 
5 years
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Bank loans and interest
 
Ps
177,080
 
Ps
606,433
 
Ps
880,357
 
Ps
12,146,826
 
Long term debt
 
 
337,107
 
 
317,789
 
 
633,140
 
 
11,442,620
 
Suppliers
 
 
428,881
 
 
 
 
 
 
 
 
 
 
Accounts payable and accrued expenses
 
 
1,175,306
 
 
 
 
 
 
 
 
 
 
 
 
 
Under
 
Between 3 months
 
Between 1
 
Between 2 and
 
At December 31, 2016
 
3 months
 
and one year
 
and 2 years
 
5 years
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Bank loans and interest
 
Ps
58,336
 
Ps
44,332
 
Ps
709,307
 
Ps
3,648,801
 
Suppliers
 
 
11,401
 
 
 
 
 
 
 
 
 
 
Accounts payable and accrued expenses
 
 
347,190
 
 
 
 
 
 
 
 
 
 
Disclosure of detailed information about working capital of entity [Text Block]
The following table shows the Company's short term liquidity as of:
 
 
 
December 31,
 
 
 
2016
 
2017
 
 
 
 
 
 
 
 
 
Current assets
 
Ps
4,233,018
 
Ps
5,787,862
 
Current liabilities
 
 
593,183
 
 
2,408,649
 
 
 
 
 
 
 
 
 
Short term position (liquidity)
 
Ps
3,639,835
 
Ps
3,379,213