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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Fair Value Disclosures [Abstract]        
Equity securities $ 258,718 $ (97,478) $ 593,038 $ (229,040)
Investment in Liberty Broadband 532,669 (425,538) 1,373,928 (402,917)
Derivative instruments (47,217) 63,809 (118,361) 72,552
Indemnification obligation (23,031) 34,891 (54,826) 63,608
Exchangeable senior debentures (42,041) (4,040) (105,081) (4,040)
Realized and unrealized gains (losses) on financial instruments, net $ 679,098 $ (428,356) $ 1,688,698 $ (499,837)