Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair Value Disclosures [Abstract]      
Equity securities $ (274,393) $ 258,629 $ 547,921
Investment in Liberty Broadband (560,413) 473,342 761,444
Variable forward 75,970 (94,807)  
Indemnification obligation 70,007    
Exchangeable senior debentures 7,284    
Realized and unrealized gains (losses) on financial instruments, net $ (681,545) $ 637,164 $ 1,309,365