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Trade receivables - Net (Schedule of Allowance for Doubtful Accounts) (Details) - MXN ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Trade and other receivables [abstract]    
Balance at beginning of year $ 231,778 $ 199,855
Provisions 4,529 7,486
Recoveries (63)  
Translations effects 854 24,437
Balance at end of year $ 237,098 $ 231,778