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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, 2017
USD ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Financial assets and liabilities      
Current interest-bearing loans and borrowings, beginning of the year   $ 1,051,237 $ 1,371,202
Non-current interest-bearing loans and borrowings, beginning of the year   943,046 219,817
Total liabilities from financing activities, beginning of the year   1,994,283 1,591,019
Net cash flows, current   419,350 (753,897)
Net cash flows, non-current   1,093,808 938,681
Net cash flows, total   1,513,158 184,874
Foreign exchange movement, current   25,924 121,271
Foreign exchange movement, non-current   (50,521) 98,450
Foreign exchange movement, total   (24,597) 219,721
Reclassification and other, current   907,051 312,661
Reclassification and other, non-current   (907,181) (313,902)
Reclassification and other, total   (130) (1,241)
Current interest-bearing loans and borrowings, end of the year $ 121,789 2,403,562 1,051,237
Non-current interest-bearing loans and borrowings, end of the year $ 54,681 1,079,152 943,046
Total liabilities from financing activities, end of the year   $ 3,482,714 $ 1,994,283