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Financial risk management: (Details 1) - MXN ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Long term debt $ 7,149,177
Accounts payable and accrued expenses 2,101,862 475,234
Not later than three months [member]    
Bank loans and interest 177,080 58,336
Long term debt 337,107  
Suppliers 428,881 11,401
Accounts payable and accrued expenses 1,175,306 347,190
Later than three months and not later than one year [member]    
Bank loans and interest 606,433 44,332
Long term debt 317,789  
Later than one year and not later than two years [member]    
Bank loans and interest 880,357 709,307
Long term debt 633,140  
Later than two years and not later than five years [Member]    
Bank loans and interest 12,146,826 $ 3,648,801
Long term debt $ 11,442,620