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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]          
Investments accounted for using the equity method $ 121,880   $ 121,880   $ 114,655
Liberty Broadband          
Schedule of Equity Method Investments [Line Items]          
Current assets 100,985   100,985   84,054
Other assets 10,306   10,306   12,122
Total assets 12,002,928   12,002,928   11,931,789
Long-term debt, including current portion 523,159   523,159   497,370
Deferred income tax liabilities 943,401   943,401   932,593
Other liabilities 14,885   14,885   14,925
Equity 10,521,483   10,521,483   10,486,901
Total liabilities and shareholders' equity 12,002,928   12,002,928   11,931,789
Revenue 3,371 $ 3,073 15,162 $ 6,213  
Operating expenses, net (8,442) (10,406) (17,987) (19,908)  
Operating income (loss) (5,071) (7,333) (2,825) (13,695)  
Share of earnings (losses) of affiliates 32,911 11,467 42,213 30,389  
Gain (loss) on dilution of investment in affiliate (5,205) (6,659) (31,962) (38,797)  
Realized and unrealized gains (losses) on financial instruments, net (2,019) 1,370 (2,019) 2,351  
Other income (expense), net (5,842) (4,364) (10,654) (8,582)  
Income tax benefit (expense) (4,194) 2,542 757 10,912  
Net earnings (loss) 10,580 $ (2,977) (4,490) $ (17,422)  
Liberty Broadband | Charter          
Schedule of Equity Method Investments [Line Items]          
Investments accounted for using the equity method $ 11,891,637   $ 11,891,637   $ 11,835,613