Annual report pursuant to Section 13 and 15(d)

Assets and Liabilities Measured at Fair Value (Schedule of Realized and Unrealized Gains (Losses)) (Details)

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Assets and Liabilities Measured at Fair Value (Schedule of Realized and Unrealized Gains (Losses)) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair Value Disclosures [Abstract]      
Equity securities $ 1,074,736 $ (274,393) $ 258,629
Investment in Liberty Broadband 2,292,869 (560,413) 473,342
Derivative instruments (50,965) 75,970 (94,807)
Indemnification obligation (123,564) 70,007  
Exchangeable senior debentures (190,676) 7,284  
Realized and unrealized gains (losses) on financial instruments, net $ 3,002,400 $ (681,545) $ 637,164