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Investments in Financial Instruments (Details) - MXN ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Financial Instruments |  |  |
Non-current financial assets | $ 43,996,852 | $ 45,136,751 |
Held-to-maturity investments |  |  |
Financial Instruments |  |  |
Non-current financial assets | 287,605 | 335,833 |
Other Financial Assets |  |  |
Financial Instruments |  |  |
Non-current financial assets | 16,487 | 45,920 |
Available-for-sale financial assets |  |  |
Financial Instruments |  |  |
Non-current financial assets | 43,692,760 | 44,754,998 | $ 40,915,820
Available-for-sale financial assets | Warrants issued by UHI |  |  |
Financial Instruments |  |  |
Non-current financial assets | 36,395,183 | 38,298,606 | 35,042,577
Available-for-sale financial assets | Available-for-sale investments |  |  |
Financial Instruments |  |  |
Non-current financial assets | $ 7,297,577 | $ 6,456,392 | $ 5,873,243

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