Annual report pursuant to Section 13 and 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
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]      
Investment in Charter, accounted for using the equity method $ 177,030 $ 114,655  
Liberty Broadband      
Schedule of Equity Method Investments [Line Items]      
Current assets 84,574 84,054  
Other assets 9,487 12,122  
Total assets 12,098,437 11,931,789  
Long-term debt 522,928 497,370  
Deferred income tax liabilities 965,829 932,593  
Other liabilities 11,062 14,925  
Equity 10,598,618 10,486,901  
Total liabilities and shareholders' equity 12,098,437 11,931,789  
Revenue 22,256 13,092 $ 30,586
Operating expenses, net (34,270) (38,570) (51,746)
Operating income (loss) (12,014) (25,478) (21,160)
Share of earnings (losses) of affiliates 166,146 2,508,991 641,544
Gain (loss) on dilution of investment in affiliate (43,575) (17,872) 770,766
Realized and unrealized gains (losses) on financial instruments, net 3,659 3,098 94,122
Other income (expense), net (22,339) (18,139) (9,600)
Income tax benefit (expense) (21,924) (416,933) (558,369)
Net earnings (loss) 69,953 2,033,667 $ 917,303
Liberty Broadband | Charter      
Schedule of Equity Method Investments [Line Items]      
Investment in Charter, accounted for using the equity method $ 12,004,376 $ 11,835,613