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Cash and cash equivalents: (Details) - MXN ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Cash and cash equivalents:        
Cash held at banks $ 10,751,796 $ 7,667,651    
Short term investments 3,121,101 5,507,340    
Total cash and cash equivalents $ 13,872,897 $ 13,174,991 $ 8,770,062 $ 5,192,628