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Operating segments (Details) $ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) segment | Dec. 31, 2019 MXN ($) segment | Dec. 31, 2018 MXN ($) segment | Dec. 31, 2017 MXN ($) segment
Operating segments |  |  |  |
Number of geographic segments | segment | 2 | 2 | 2 | 2
Total operating revenues | $ 1,844,113 | $ 34,752,672 | $ 27,305,150 | $ 24,788,186
Non-derivatives financial instruments | $ (3,871) | (72,949) |  |
Domestic (Mexico) |  |  |  |
Operating segments |  |  |  |
Total operating revenues |  | 24,594,797 | 18,493,476 | 17,272,946
United States of America and Central America |  |  |  |
Operating segments |  |  |  |
Total operating revenues |  | $ 10,230,824 | $ 8,811,674 | $ 7,515,240
United States of America |  |  |  |
Operating segments |  |  |  |
Percentage of total revenues from external customers | 29.00% | 29.00% | 31.00% | 29.00%

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