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INTANGIBLE ASSETS - Indefinite-lived assets (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Apr. 06, 2021 | Jun. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Goodwill |  | $ 8,206,420 | $ 8,206,420 | $ 8,160,566
Cable television franchises |  | 13,216,355 | 13,216,355 | $ 13,068,017
Indefinite-lived Intangible Assets Acquired |  |  | 148,338 |
Goodwill acquired |  |  | 45,854 |
North Carolina Assets |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Customer Relationships, Gross |  | 58,777 | 58,777 |
Goodwill acquired |  |  | 33,497 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  | 71,586 | 71,586 |
Consideration transfered | $ 312,184 |  |  |
Lightpath Acquired Assets |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Customer Relationships, Gross |  | 2,294 | 2,294 |
Goodwill acquired |  |  | 12,357 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  | 14,649 | $ 14,649 |
Consideration transfered |  | $ 28,386 |  |

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