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Financial Instruments (Details) $ / shares in Units, $ in Thousands, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) $ / shares | Dec. 31, 2016 $ / shares | Dec. 31, 2017 MXN ($) | Jul. 31, 2015 USD ($)
Financial Instruments |  |  |  |
Principal amount |  |  | $ 123,550,897 |
UHI | Warrants issued by UHI |  |  |  |
Financial Instruments |  |  |  |
Principal amount |  |  |  | $ 1,125
Stock spot price | $ / shares | $ 402 | $ 404 |  |
Expected volatility rate | 32.00% | 32.00% |  |
UHI | Convertible debenture due 2025 |  |  |  |
Financial Instruments |  |  |  |
Principal amount | $ 1,125 |  | $ 16,606,463 |
Convertible debentures at the company's option for equity stake of UHI percentage | 30.00% |  |  |
Minimum | Temporary investments |  |  |  |
Financial Instruments |  |  |  |
Maturity period | 3 months |  |  |
Minimum | UHI | Convertible debenture due 2025 |  |  |  |
Financial Instruments |  |  |  |
Expected weighted average cost of capital | 8.00% |  |  |
Maximum | Temporary investments |  |  |  |
Financial Instruments |  |  |  |
Maturity period | 1 year |  |  |
Maximum | UHI | Convertible debenture due 2025 |  |  |  |
Financial Instruments |  |  |  |
Expected weighted average cost of capital | 10.00% |  |  |

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