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Assets and Liabilities Measured at Fair Value - (Schedule of Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents $ 23,588 $ 54,552
Equity securities 2,732,999 2,600,008
Investment in Liberty Broadband 5,290,841 5,367,242
Derivative instrument liability 61,437 71,305
Quoted prices in active markets for identical assets (Level 1)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 23,588 54,552
Equity securities 2,732,999 2,600,008
Investment in Liberty Broadband 5,290,841 5,367,242
Significant other observable inputs (Level 2)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative instrument liability $ 61,437 $ 71,305