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INTANGIBLE ASSETS - Goodwill (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jun. 30, 2021
Apr. 30, 2021
Jul. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jul. 14, 2020
Goodwill [Roll Forward]              
Goodwill, beginning balance       $ 8,160,566 $ 8,142,309    
Adjustments to purchase accounting relating to acquisitions     $ 18,257 45,297 18,257    
Goodwill, ending balance       8,205,863 8,160,566 $ 8,142,309  
Cable television franchises       13,216,355 13,068,017 13,020,081  
Indefinite-lived Intangible Assets Acquired     47,936 148,338 47,936    
Goodwill       8,205,863 8,160,566 8,142,309  
Indefinite-lived Intangible Assets Acquired     47,936 148,338 47,936    
Adjustments to purchase accounting relating to acquisitions     $ 18,257 45,297 18,257    
Payment for acquisitions, net of cash acquired       $ (340,444) $ (149,973) $ (172,269)  
Service Electric of New Jersey [Member] | Customer Relationships [Member]              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Excluding Receivables             $ 35,074
Service Electric of New Jersey [Member] | Property, Plant and Equipment              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Excluding Receivables             $ 52,362
Lightpath Acquired Assets              
Goodwill [Roll Forward]              
Goodwill acquired $ 11,800            
Consideration transfered 28,260            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment 14,649            
Finite-Lived Customer Relationships, Gross 2,294            
Goodwill acquired $ 11,800            
North Carolina Assets              
Goodwill [Roll Forward]              
Goodwill acquired   $ 33,497          
Indefinite-lived Intangible Assets Acquired   148,338          
Indefinite-lived Intangible Assets Acquired   148,338          
Consideration transfered   312,184          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment   71,586          
Finite-Lived Customer Relationships, Gross   58,777          
Goodwill acquired   $ 33,497