Annual report pursuant to Section 13 and 15(d)

Assets and Liabilities Measured at Fair Value (Schedule of Assets and Liabilities) (Details)

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Assets and Liabilities Measured at Fair Value (Schedule of Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents $ 533,484 $ 384,071
Equity securities 2,600,008 1,529,901
Investment in Liberty Broadband 5,367,242 3,074,373
Derivative instrument liability 71,305 20,340
Indemnification obligation 202,086 78,522
Exchangeable senior debentures 658,839 462,336
Exchangeable senior debentures    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Exchangeable senior debentures 658,839 462,336
Quoted prices in active markets for identical assets (Level 1)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 533,484 384,071
Equity securities 2,600,008 1,529,901
Investment in Liberty Broadband 5,367,242 3,074,373
Derivative instrument liability 0 0
Indemnification obligation 0 0
Quoted prices in active markets for identical assets (Level 1) | Exchangeable senior debentures    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Exchangeable senior debentures 0 0
Significant other observable inputs (Level 2)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 0 0
Equity securities 0 0
Investment in Liberty Broadband 0 0
Derivative instrument liability 71,305 20,340
Indemnification obligation 202,086 78,522
Significant other observable inputs (Level 2) | Exchangeable senior debentures    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Exchangeable senior debentures $ 658,839 $ 462,336