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, 2019
Mar. 31, 2018
Fair Value Disclosures [Abstract]    
Equity securities $ 334,320 $ (131,562)
Investment in Liberty Broadband 841,259 22,621
Variable forward (71,144) 8,743
Indemnification obligation (31,795) 28,717
Exchangeable senior debentures (63,040) 0
Realized and unrealized gains (losses) on financial instruments, net $ 1,009,600 $ (71,481)