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Long-term debt: (Details) $ in Thousands, $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($) | Jun. 24, 2015 USD ($)
Long-term debt: |  |  |  |  |  |  |
Long |  |  |  |  | $ 6,488,569 | $ 6,957,678 |
Fair value |  |  |  |  | 6,712,834 | 7,392,772 |
Senior secured notes due on March 22, 2035 |  |  |  |  |  |  |
Long-term debt: |  |  |  |  |  |  |
Credit line | $ 400,000 |  | $ 400,000 |  | 7,333,536 | 6,843,134 | $ 50,000
Intererst | $ (9,831) | $ (51,268) | $ (10,152) | $ (43,193) |  |  |
Short |  |  |  |  | 324,590 | 311,372 |
Long |  |  |  |  | 6,957,678 | 6,488,569 |
Fair value |  |  |  |  | $ 7,509,065 | $ 7,082,022 |

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