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Assets and Liabilities Measured at Fair Value - (Schedule of Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents $ 87,448 $ 66,348
Equity securities 2,117,533 1,529,901
Investment in Liberty Broadband 4,448,302 3,074,373
Derivative instrument    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative instrument 138,701 20,340
Quoted prices in active markets for identical assets (Level 1)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 87,448 66,348
Equity securities 2,117,533 1,529,901
Investment in Liberty Broadband 4,448,302 3,074,373
Quoted prices in active markets for identical assets (Level 1) | Derivative instrument    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative instrument 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
Significant other observable inputs (Level 2) | Derivative instrument    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative instrument $ 138,701 $ 20,340