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Cash and cash equivalents (Details)
$ in Thousands, $ in Thousands
Dec. 31, 2019
USD ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Cash and cash equivalents            
Short-term investments   $ 3,231,125   $ 4,796,554 $ 5,982,314  
Cash in banks   4,612,927   1,061,150 963,162  
Cash on hand   44,880   5,238 5,403  
Restricted funds held in trust related to debt service reserves   91,040        
Total cash and cash equivalents $ 423,449 $ 7,979,972 $ 311,111 $ 5,862,942 $ 6,950,879 $ 7,071,251