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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Fair Value Disclosures [Abstract]        
Equity securities $ 175,359 $ 143,158 $ (53,681) $ 405,655
Investment in Liberty Broadband 366,211 364,930 (36,706) 906,136
Variable forward (3,223) (35,325) 69,329 (41,027)
Indemnification obligation (14,937) 0 48,671 0
Exchangeable senior debentures (27,901) 0 (31,941) 0
Realized and unrealized gains (losses) on financial instruments, net $ 495,509 $ 472,763 $ (4,328) $ 1,270,764