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Financial risk management: Short term liquidity (Details) - MXN ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Financial risk management:    
Current assets $ 7,845,856 $ 6,000,912
Current liabilities 2,560,020 2,408,222
Short term position (liquidity) $ 5,285,836 $ 3,592,690