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Investments in Associates and Joint Ventures - Joint venture Narrative(Details) - Grupo de Telecomunicaciones de Alta Capacidad, S.A.P.I. de C.V. ("GTAC") - MXN ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2010 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Investments in Associates and Joint Ventures |  |  |  |
Lease term of contract |  | 20 years |  |
Ownership interest in joint venture |  | 33.33% |  |
Payment of principal and interest |  | $ (251,830) |  |
Amounts receivable in connection with long-term credit facility and supplementary loans |  | 929,516 | $ 881,740 |
Long-term credit facility |  |  |  |
Investments in Associates and Joint Ventures |  |  |  |
Long-term credit facility amount | $ 688,217 |  |  |
Interest rate basis | TIIE |  |  |
Basis points | 2.00% |  |  |
Used principal amount of the credit facility |  | 688,183 | 688,183 |
Payment of principal and interest |  | 203,945 | 0 |
Debt |  |  |  |
Investments in Associates and Joint Ventures |  |  |  |
Interest rate basis |  |  |  | TIIE
Basis points |  |  |  | 2.00%
Principal amount |  |  |  | $ 582,735
Payment of principal and interest |  | $ 47,885 | $ 0 |

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