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Accrued liabilities - Other liabilities, short-term and long-term (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
MXN ($)
Accrued liabilities          
Other liabilities   $ 420,755 $ 159,499   $ 497,446
Short-term maturities   284,200   $ 14,225 280,744
Long-term   136,555   $ 10,980 $ 216,702
Cancellations, or write off related to liabilities $ 0 $ 0 $ 0