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, 2019
Dec. 31, 2018
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]      
Investment in Charter, accounted for using the equity method $ 167,643 $ 177,030  
Realized and unrealized gains (losses) on financial instruments, net 3,002,400 (681,545) $ 637,164
Liberty Broadband      
Schedule of Equity Method Investments [Line Items]      
Current assets 52,133 84,574  
Other assets 9,535 9,487  
Total assets 12,256,342 12,098,437  
Long-term debt 572,944 522,928  
Deferred income tax liabilities 999,757 965,829  
Other liabilities 15,695 11,062  
Equity 10,667,946 10,598,618  
Total liabilities and shareholders' equity 12,256,342 12,098,437  
Revenue 14,859 22,256 13,092
Operating expenses, net (44,136) (34,270) (38,570)
Operating income (loss) (29,277) (12,014) (25,478)
Share of earnings (losses) of affiliates 286,401 166,146 2,508,991
Gain (loss) on dilution of investment in affiliate (79,329) (43,575) (17,872)
Realized and unrealized gains (losses) on financial instruments, net 1,170 3,659 3,098
Other income (expense), net (23,807) (22,339) (18,139)
Income tax benefit (expense) (37,942) (21,924) (416,933)
Net earnings (loss) 117,216 69,953 $ 2,033,667
Liberty Broadband | Charter      
Schedule of Equity Method Investments [Line Items]      
Investment in Charter, accounted for using the equity method $ 12,194,674 $ 12,004,376