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Accounts receivable - Net: (Details) - MXN ($)
$ in Thousands
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Clients $ 991,033 $ 191,682 $ 858,900
Less: impairment provision (179,639)   (173,398)
Adoption effect IFRS 9 (18,284)    
Total accounts receivable $ 793,110   $ 685,502