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Financial assets and liabilities - Changes in liabilities arising from financing activities (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Financial assets and liabilities        
Current interest-bearing loans and borrowings, beginning of the year   $ 2,403,562 $ 1,051,237 $ 1,371,202
Non-current interest-bearing loans and borrowings, beginning of the year   1,079,152 943,046 219,817
Total liabilities from financing activities, beginning of the year   3,482,714 1,994,283 1,591,019
Net cash flows, current   (793,363) 419,350 (753,897)
Net cash flows, non-current   808,620 1,093,808 938,681
Net cash flows, total   15,257 1,513,158 184,784
Accrued Interest, Current   10,392 (130) (1,239)
Accrued interest   10,392 (130) (1,239)
Foreign exchange movement, current   71,380 25,924 121,269
Foreign exchange movement, non-current   (56,945) (50,521) 98,450
Foreign exchange movement, total   14,435 (24,597) 219,719
Reclassification and other, current   (479,712) 907,181 313,902
Reclassification and other, non-current   480,112 (907,181) (313,902)
Reclassification and other, total   400    
Current interest-bearing loans and borrowings, end of the year $ 61,590 1,212,259 2,403,562 1,051,237
Non-current interest-bearing loans and borrowings, end of the year $ 117,409 2,310,939 1,079,152 943,046
Total liabilities from financing activities, end of the year   $ 3,523,198 $ 3,482,714 $ 1,994,283