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 ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Investments in affiliates accounted for using the Equity Method      
Carrying value of equity method investment $ 11,866,434   $ 11,835,613
Excess basis allocation within memo accounts      
Share of (earnings) loses of affiliates, net 9,302 $ 18,922  
Gain (loss) on dilution of investment in affiliate (26,757) (32,138)  
Other assets 49   49
Accounts payable and accrued liabilities 2,703   5,381
Deferred income tax liabilities 939,821   932,593
Total equity 10,511,395   10,486,901
Charter      
Investments in affiliates accounted for using the Equity Method      
Carrying value of equity method investment 11,866,000    
Market value of equity method investment $ 16,828,000    
Ownership percentage 23.00%    
Excess basis allocation within memo accounts      
Property and equipment $ 351,000   361,000
Customer relationships 693,000   689,000
Franchise fees 1,701,000   1,670,000
Trademarks 29,000   29,000
Goodwill 1,031,000   986,000
Debt (99,000)   (98,000)
Deferred income tax liability (669,000)   (662,000)
Total 3,037,000   $ 2,975,000
Excess basis amortization of debt and intangible assets 28,700 12,100  
Gain (loss) on dilution of investment in affiliate $ (26,800) $ (32,100)  
Charter | Customer relationships      
Excess basis allocation within memo accounts      
Useful lives of customer relationships 13 years    
Charter | Property, Plant and Equipment      
Excess basis allocation within memo accounts      
Useful lives of property and equipment 7 years    
Adjustment | ASU 2016-09 | Charter      
Excess basis allocation within memo accounts      
Other assets $ 120,000    
Accounts payable and accrued liabilities 71,000    
Deferred income tax liabilities 11,000    
Total equity $ 38,000