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Acquisitions, Investments and Dispositions - UHI (Details) $ in Thousands, $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jul. 31, 2015 USD ($) | Jul. 31, 2015 MXN ($) | Jun. 30, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 MXN ($) | Jul. 31, 2015 MXN ($)
UHI |  |  |  |  |  |  |
Income from UHI |  |  |  |  |  | $ 2,194,981 |
UHI |  |  |  |  |  |  |
UHI |  |  |  |  |  |  |
Proportion of voting rights held in associate | 22.00% | 22.00% |  |  |  |  |
Investment in convertible debentures | $ 1,125.0 |  |  |  |  |  | $ 17,634,375
Income from UHI | $ 135.1 | $ 2,194,981 |  |  |  |  |
Proportion of ownership interest in associate | 10.00% | 10.00% | 7.80% | 10.00% | 10.00% |  |

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