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Assets and Liabilities Measured at Fair Value (Schedule of Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents $ 88,453 $ 66,348
Equity securities 1,862,553 1,529,901
Investment in Liberty Broadband 3,915,632 3,074,373
Variable forward    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Variable forward 91,484 20,340
Quoted prices in active markets for identical assets (Level 1)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash equivalents 88,453 66,348
Equity securities 1,862,553 1,529,901
Investment in Liberty Broadband 3,915,632 3,074,373
Quoted prices in active markets for identical assets (Level 1) | Variable forward    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Variable forward 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) | Variable forward    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Variable forward $ 91,484 $ 20,340