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Financial risk management: Liquidity risk (Details) - MXN ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure of risk management strategy related to hedge accounting [line items]    
Long-term debt $ 6,641,941 $ 6,488,569
Accounts payable and accrued expenses (Note 9) 1,598,404 1,799,330
Three months    
Disclosure of risk management strategy related to hedge accounting [line items]    
Bank loans and interest 11,176 14,639
Long-term debt 114,420 111,676
Suppliers 353,806 245,100
Accounts payable and accrued expenses (Note 9) 1,187,345 1,378,657
Later than three months and not later than one year [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Bank loans and interest 797,339 223,596
Long-term debt 215,815 199,696
2021    
Disclosure of risk management strategy related to hedge accounting [line items]    
Bank loans and interest 2,238,558 228,073
Long-term debt 233,123 204,492
Later than two years and not later than five years [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Bank loans and interest 3,881,097 6,446,644
Long-term debt $ 6,408,818 $ 6,284,077