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Investments in Charter Accounted for Using the Equity Method (Details) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Excess basis allocation within memo accounts |  |  |
Loss on dilution of investment in affiliate | $ (82,215) | $ (59,325) |
Charter |  |  |
Excess basis allocation within memo accounts |  |  |
Property and equipment | 766,000 |  | $ 733,000
Customer relationships | 2,769,000 |  | 2,726,000
Franchise fees | 3,849,000 |  | 3,693,000
Trademarks | 29,000 |  | 29,000
Goodwill | 4,116,000 |  | 3,934,000
Debt | (626,000) |  | (602,000)
Deferred income tax liability | (1,693,000) |  | (1,641,000)
Total | 9,210,000 |  | $ 8,872,000
Amortization of Deferred Charges | 57,900 | 40,100 |
Loss on dilution of investment in affiliate | $ (82,200) | $ (59,300) |
Charter | Customer relationships |  |  |
Excess basis allocation within memo accounts |  |  |
Remaining useful lives of customer relationships | 10 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 |

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