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Operating segments (Details) $ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) segment | Dec. 31, 2017 MXN ($) segment | Dec. 31, 2016 MXN ($) segment | Dec. 31, 2015 MXN ($) segment
Operating segments |  |  |  |
Number of geographic segments | segment | 2 | 2 | 2 | 2
Total operating revenues | $ 1,258,924 | $ 24,845,375 | $ 23,512,451 | $ 18,179,704
Domestic (Mexico) |  |  |  |
Operating segments |  |  |  |
Total operating revenues |  | 17,313,740 | 15,720,807 | 12,579,806
United States of America and Central America |  |  |  |
Operating segments |  |  |  |
Total operating revenues |  | $ 7,531,635 | $ 7,791,644 | $ 5,599,898
United States of America |  |  |  |
Operating segments |  |  |  |
Percentage of total revenues from external customers | 29.00% | 29.00% | 32.00% | 31.00%

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