Quarterly report pursuant to Section 13 or 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
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Fair Value Disclosures [Abstract]    
Equity securities $ (261,134) $ 334,320
Investment in Liberty Broadband (641,508) 841,259
Derivative instruments 47,140 (71,144)
Indemnification obligation 22,340 (31,795)
Exchangeable senior debentures (830) (63,040)
Realized and unrealized gains (losses) on financial instruments, net $ (833,992) $ 1,009,600