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Financial risk management: Liquidity risk (Details) - MXN ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure of risk management strategy related to hedge accounting [line items]    
Long-term debt $ 6,488,569 $ 6,957,678
Accounts payable and accrued expenses (Note 10) 1,799,330 1,871,424
Three months    
Disclosure of risk management strategy related to hedge accounting [line items]    
Bank loans and interest 14,639 14,506
Long-term debt 111,676 119,680
Suppliers 245,100 313,577
Accounts payable and accrued expenses (Note 10) 1,378,657 1,557,847
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 223,596 161,009
Long-term debt 199,696 204,910
2020    
Disclosure of risk management strategy related to hedge accounting [line items]    
Bank loans and interest 228,073 212,959
Long-term debt 204,492 208,027
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 6,446,644 6,829,639
Long-term debt $ 6,284,077 $ 6,749,651