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Accounts payable and accrued expenses: (Details) - MXN ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Suppliers $ 313,574 $ 428,881
Taxes payable 230,196 157,387
Use rights of assets under concession 247,729 127,076
Accounts payable to related parties (Note 15.1) 97,332 87,951
Salaries payable 127,289 111,984
Sundry creditors for services provided 810,973 583,059
Accounts payable to contractors 44,331 265,236
Total $ 1,871,424 $ 1,761,574