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Cash and cash equivalents: (Details) - MXN ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash and cash equivalents:        
Cash and cash held at banks $ 6,589,294 $ 3,514,293    
Short term investments 2,180,768 1,678,335    
Total cash and cash equivalents $ 8,770,062 $ 5,192,628 $ 6,192,679 $ 4,584,507