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Cash and cash equivalents: (Details) - MXN ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash and cash equivalents:        
Cash held at banks $ 7,667,651 $ 6,589,294    
Short term investments 5,507,340 2,180,768    
Total cash and cash equivalents $ 13,174,991 $ 8,770,062 $ 5,192,628 $ 6,192,679