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Accounts payable and accrued expenses: (Details) - MXN ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Suppliers $ 428,881 $ 11,401
Taxes payable 157,387 116,643
Use rights of assets under concession 127,076 109,437
Accounts payable to related parties (Note 15.1) 87,951 71,725
Salaries payable 111,984 71,022
Sundry creditors for services provided 583,059 94,349
Interest payable of the Bank Loans (Note 12) 340,288  
Accounts payable to contractors 265,236 657
Total $ 2,101,862 $ 475,234