Quarterly report pursuant to Section 13 or 15(d)

Investments in Affiliates Accounted for Using the Equity Method (Summary of Financial Information) (Details)

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Investments in Affiliates Accounted for Using the Equity Method (Summary of Financial Information) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]      
Investment accounted for using the equity method $ 112,975   $ 114,655
Liberty Broadband      
Schedule of Equity Method Investments [Line Items]      
Current assets 79,885   84,054
Other assets 11,228   12,122
Total assets 11,957,547   11,931,789
Long-term debt, including current portion 497,764   497,370
Deferred income tax liabilities 939,821   932,593
Other liabilities 8,567   14,925
Equity 10,511,395   10,486,901
Total liabilities and shareholders' equity 11,957,547   11,931,789
Revenue 11,791 $ 3,140  
Operating expenses, net (9,545) (9,502)  
Operating income (loss) 2,246 (6,362)  
Share of earnings (losses) of affiliates 9,302 18,922  
Gain (loss) on dilution of investment in affiliate (26,757) (32,138)  
Realized and unrealized gains (losses) on financial instruments, net 0 981  
Other income (expense), net (4,812) (4,218)  
Income tax benefit (expense) 4,951 8,370  
Net earnings (loss) (15,070) $ (14,445)  
Liberty Broadband | Charter (a)      
Schedule of Equity Method Investments [Line Items]      
Investment accounted for using the equity method $ 11,866,434   $ 11,835,613