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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Fair Value Disclosures [Abstract]        
Equity securities $ (97,478) $ 51,212 $ (229,040) $ 262,497
Investment in Liberty Broadband (425,538) 14,939 (402,917) 541,206
Variable forward 63,809 (5,702) 72,552 (5,702)
Indemnification obligation 34,891 0 63,608 0
Exchangeable senior debentures (4,040) 0 (4,040) 0
Realized and unrealized gains (losses) on financial instruments, net $ (428,356) $ 60,449 $ (499,837) $ 798,001