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Employee benefits - Analysis of net period cost (Details) - MXN ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Employee benefits      
Current service cost $ 4,977 $ 3,657 $ 2,421
Interest cost on benefit obligation 1,424 1,000 701
Net period cost $ 6,401 $ 4,657 $ 3,122