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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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Gross carrying amount before accumulated amortization as of the balance sheet date to an asset acquired in a business combination representing a favorable existing relationship with customers having a finite beneficial life.

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