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Cash and cash equivalents (Details)
$ in Thousands, $ in Thousands
Dec. 31, 2018
USD ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Cash and cash equivalents            
Short-term investments   $ 4,796,554   $ 5,982,314 $ 4,433,559  
Cash in banks   1,061,150   963,162 2,632,878  
Cash on hand   5,238   5,403 4,814  
Total cash and cash equivalents $ 297,870 $ 5,862,942 $ 353,143 $ 6,950,879 $ 7,071,251 $ 5,157,313