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Financial risk management: (Details 2) - MXN ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Financial risk management [Abstract]    
Current assets $ 6,000,912 $ 5,787,862
Current liabilities 2,408,222 2,408,649
Short term position (liquidity) $ 3,592,690 $ 3,379,213