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Long term debt: (Details) $ in Thousands, $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 MXN ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 MXN ($) | Dec. 31, 2017 USD ($) | Jun. 24, 2015 USD ($) | Mar. 22, 2013 MXN ($) | Mar. 22, 2013 USD ($)
Intererst | $ 1,804 |  | $ 27,606 |  |  |  |
Long | 7,149,177 |  |  |  |  |  |
Fair value | 10,791,338 |  | $ 4,765,630 |  |  |  |
Senior secured notes due on March 22, 2035 [Member] |  |  |  |  |  |  |
Credit line | 7,489,465 |  |  | $ 400,000 | $ 50,000 | $ 4,471,000 | $ 350,000
Intererst | 126,712 | $ 6,444 |  |  |  |  |
Short | 340,288 |  |  |  |  |  |
Long | 7,149,177 |  |  |  |  |  |
Fair value | $ 6,766,798 |  |  |  |  |  |

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