Annual report pursuant to Section 13 and 15(d)

Investments in Affiliates Accounted for Using the Equity Method (Investment in Liberty Broadband) (Details)

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Investments in Affiliates Accounted for Using the Equity Method (Investment in Liberty Broadband) (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
May 18, 2016
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
May 31, 2015
$ / shares
Schedule of Equity Method Investments [Line Items]          
Investment in affiliates   $ 177,030 $ 114,655    
Acquisition of interest in investments   0 0 $ 2,400,000  
Series A common stock | Charter          
Schedule of Equity Method Investments [Line Items]          
Share exchange ratio 1        
Liberty Broadband          
Schedule of Equity Method Investments [Line Items]          
Investment in affiliates   $ 3,074,373 3,634,786    
Percentage ownership   23.50%      
Liberty Broadband | Series C Preferred Stock          
Schedule of Equity Method Investments [Line Items]          
Investment in affiliates $ 2,400,000        
Liberty Broadband | Series C common stock          
Schedule of Equity Method Investments [Line Items]          
Share price (in dollars per share) | $ / shares         $ 56.23
Charter | Liberty Broadband          
Schedule of Equity Method Investments [Line Items]          
Investment in affiliates   $ 12,004,376 $ 11,835,613    
Acquisition of interest in investments $ 5,000,000