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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. and subsidiaries ("GTAC") - MXN ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2010 | Dec. 31, 2020 | Dec. 31, 2019
Investments in Associates and Joint Ventures |  |  |
Lease term of contract |  | 20 years |
Ownership interest in joint venture |  | 33.30% |
Payment of principal and interest |  | $ (246,046) | $ (200,895)
Amounts receivable in connection with long-term credit facility and supplementary loans |  | 821,253 | 872,317
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 |  | 123,390 | $ 114,574
Long term loans |  |  |
Investments in Associates and Joint Ventures |  |  |
Interest rate basis |  |  | TIIE
Basis points |  |  | 2.00%
Principal amount |  |  | $ 946,128
Payment of principal and interest |  | $ 122,656 | $ 86,321

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