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Financial risk management: (Details 1) - MXN ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Long-term debt $ 6,957,678 $ 7,149,177,000
Accounts payable and accrued expenses 1,871,424 1,761,574
Not later than three months [member]    
Bank loans and interest 14,506 177,080
Long-term debt 119,680 337,107
Suppliers 313,577 428,881
Accounts payable and accrued expenses 1,557,847 1,175,306
Later than three months and not later than one year [member]    
Bank loans and interest 161,009 606,433
Long-term debt 204,910 317,789
Later than one year and not later than two years [member]    
Bank loans and interest 212,959 880,357
Long-term debt 208,027 633,140
Later than two years and not later than five years [member]    
Bank loans and interest 6,829,639 12,146,826
Long-term debt $ 6,749,651 $ 11,442,620