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Share-based payments - (Benefit) expense recognized in retention plan (Details) - MXN ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based payments      
(Benefit) arising from cash-settled share-based payments transactions $ (5,238) $ (25,498)  
Expense arising from cash-settled share-based payments transactions     $ 86,100
Expense arising from equity-settled share-based payments transactions 19,980 13,508 7,816
Total (benefit) arising from share-based payments transactions   $ (11,990)  
Total expense arising from share-based payments transactions $ 14,742   $ 93,916