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Accrued liabilities - Other liabilities, short-term and long-term (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
MXN ($)
Accrued liabilities          
Short-term maturities   $ 280,744 $ 284,200 $ 5,981 $ 117,724
Long-term   216,702 136,555 $ 16,661 $ 327,934
Cancellations, or write off related to liabilities $ 0 $ 0 $ 0