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Accounts payable and accrued expenses: (Details) - MXN ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Accounts payable and accrued expenses:    
Suppliers $ 307,068 $ 290,687
Taxes payable 574,311 311,847
Use rights of assets under concession 575,598 337,087
Accounts payable to related parties 169,696 127,901
Lease payable 23,547 24,510
Salaries payable 187,209 166,089
Sundry creditors for services provided 915,873 959,376
Accounts payable to contractors 61,202 271,462
Total $ 2,814,504 $ 2,488,959