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 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Fair Value Disclosures [Abstract]        
Equity securities $ 90,770 $ 175,359 $ 683,808 $ (53,681)
Investment in Liberty Broadband 19,207 366,211 1,393,135 (36,706)
Derivative instruments 60,640 (3,223) (57,721) 69,329
Indemnification obligation (3,485) (14,937) (58,311) 48,671
Exchangeable senior debentures (10,967) (27,901) (116,048) (31,941)
Realized and unrealized gains (losses) on financial instruments, net $ 156,165 $ 495,509 $ 1,844,863 $ (4,328)