Quarterly report pursuant to Section 13 or 15(d)

Investments in Charter Accounted for Using the Equity Method (Details)

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Investments in Charter Accounted for Using the Equity Method (Details) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Excess basis allocation within memo accounts            
Loss on dilution of investment in affiliate $ (1,693) $ (35,284)   $ (98,446) $ (140,610)  
Charter.            
Excess basis allocation within memo accounts            
Property and equipment 709,000     709,000   $ 733,000
Customer relationships 2,638,000     2,638,000   2,726,000
Franchise fees 3,867,000     3,867,000   3,693,000
Trademarks 29,000     29,000   29,000
Goodwill 4,113,000     4,113,000   3,934,000
Debt (578,000)     (578,000)   (602,000)
Deferred income tax liability (1,663,000)     (1,663,000)   (1,641,000)
Total 9,115,000     9,115,000   $ 8,872,000
Amortization of Deferred Charges 58,400 25,500   180,800 107,300  
Loss on dilution of investment in affiliate $ (1,700) $ (35,300)   $ (98,400) $ (140,600)  
Charter. | Customer relationships            
Excess basis allocation within memo accounts            
Remaining useful lives of customer relationships       9 years    
Charter. | Property, Plant and Equipment            
Excess basis allocation within memo accounts            
Remaining useful lives of property and equipment       6 years    
Charter. | Series A common stock            
Investments in affiliates accounted for using the Equity Method            
Exercise of preemptive right to purchase Charter shares     35      
Exercise of preemptive right to purchase Charter shares     $ 14,900