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Accrued liabilities - Other liabilities, short-term and long-term (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
MXN ($)
Accrued liabilities          
Short-term maturities   $ 25,835 $ 202,250 $ 21,608 $ 407,190
Long-term   1,820,194 1,454,790 $ 77,982 $ 1,469,595
Cancellations, or write off related to liabilities $ 0 $ 0 $ 0