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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, 2019
USD ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Financial assets and liabilities        
Current interest-bearing loans and borrowings, beginning of the year   $ 1,212,259 $ 2,403,562 $ 1,051,237
Non-current interest-bearing loans and borrowings, beginning of the year   2,310,939 1,079,152 943,046
Total liabilities from financing activities, beginning of the year   3,523,198 3,482,714 1,994,283
Net cash flows, current   (633,609) (793,363) 419,350
Net cash flows, non-current   2,273,143 808,620 1,093,808
Net cash flows, total   1,639,534 15,257 1,513,158
Accrued Interest, Current   13,698 10,392 (130)
Accrued interest   13,698 10,392 (130)
Foreign exchange movement, current   (41,173) 71,380 25,924
Foreign exchange movement, non-current   (122,466) (56,945) (50,521)
Foreign exchange movement, total   (163,639) 14,435 (24,597)
Reclassification and other, current   1,534,842 (479,712) 907,181
Reclassification and other, non-current   (1,571,664) 480,112 (907,181)
Reclassification and other, total   (36,822) 400  
Current interest-bearing loans and borrowings, end of the year $ 110,692 2,086,017 1,212,259 2,403,562
Non-current interest-bearing loans and borrowings, end of the year $ 153,352 2,889,952 2,310,939 1,079,152
Total liabilities from financing activities, end of the year   $ 4,975,969 $ 3,523,198 $ 3,482,714