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Accounts receivable - Net: (Details) - MXN ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounts receivable - Net:      
Clients $ 1,195,559 $ 991,033  
Less: impairment provision (191,766) (179,639) $ (173,398)
Adoption effect IFRS 9   (18,284)  
Accounts receivable - net $ 1,003,793 $ 793,110