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Trade receivables - Net (Schedule of Allowance for Doubtful Accounts) (Details) - MXN ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Trade and other receivables [abstract]    
Balance at beginning of year $ 199,855 $ 59,095
Provisions 7,486 141,140
Translations effects 24,437 (380)
Balance at end of year $ 231,778 $ 199,855