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Financial risk management: (Tables)
 12 Months Ended
Dec. 31, 2018
Financial risk management [Abstract]  
Disclosure of effect of changes in foreign exchange rates [text block]
At December 31, 2017 and 2018, the Company is exposed to exchange rate risk for monetary position, as shown in the next page:
 
 
 
December 31,
 
 
 
2017
 
 
2018
 
 
 
 
 
 
 
 
Monetary position:
 
 
 
 
 
 
 
 
Asset
 
USD
50,905
 
 
USD
45,003
 
Liability
 
 
(148,417
)
 
 
(3,149
)
 
 
 
 
 
 
 
 
 
 
 
USD 
(97,512
)
 
USD
41,854
 
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, 2018
 
3 months
 
 
and one year
 
 
and 2 years
 
 
5 years
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Bank loans and interest
 
Ps
14,506
 
 
Ps
161,009
 
 
Ps
212,959
 
 
Ps
6,829,639
 
Long-term debt
 
 
119,680
 
 
 
204,910
 
 
 
208,027
 
 
 
6,749,651
 
Suppliers
 
 
313,577
 
 
 
 
 
 
 
 
 
 
 
 
 
Accounts payable and accrued expenses
 
 
1,557,847
 
 
 
 
 
 
 
 
 
 
 
 
 
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,
 
 
 
2017
 
 
2018
 
 
 
 
 
 
 
 
Current assets
 
Ps
5,787,862
 
 
Ps
6,000,912
 
Current liabilities
 
 
2,408,649
 
 
 
2,408,222
 
 
 
 
 
 
 
 
 
 
Short term position (liquidity)
 
Ps
3,379,213
 
 
Ps
3,592,690