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Finance income and cost (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Analysis of finance income        
Interest on cash and equivalents   $ 201,191 $ 152,437 $ 105,151
Interest on asset backed trust notes   6,525    
Interest on recovery of guarantee deposits   83 166 644
Total finance income $ 11,027 207,799 152,603 105,795
Analysis of finance cost        
Leases financial cost   2,128,162 1,755,978 1,428,924
Interest on asset backed trust notes   80,314    
Cost of letter credit notes   49,856 57,277 42,294
Interest on debts and borrowings   1,660 56,916 37,565
Bank fees and others   3,607 6,141 5,279
Other finance costs   6,230   1,219
Total finance costs $ 120,446 2,269,829 1,876,312 1,515,281
Capitalized borrowing costs        
Interest on debts and borrowings   457,973 414,836 230,954
Capitalized interest   (456,313) (357,920) (193,389)
Interest on debts and borrowing in the consolidated statements of operations   $ 1,660 $ 56,916 $ 37,565