Quarterly report pursuant to Section 13 or 15(d)

Assets and Liabilities Measured at Fair Value - (Schedule of Realized and Unrealized Gains (Losses)) (Details)

v3.20.2
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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Realized and unrealized gains (losses) on financial instruments, net (note 3) $ 1,172,685 $ 156,165 $ 1,199,560 $ 1,844,863
Equity Securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Realized and unrealized gains (losses) on financial instruments, net (note 3) 612,465 90,770 746,406 683,808
Investment In Liberty Broadband        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Realized and unrealized gains (losses) on financial instruments, net (note 3) 807,114 19,207 730,713 1,393,135
Derivative Instruments        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Realized and unrealized gains (losses) on financial instruments, net (note 3) (2,019) 60,640 7,849 (57,721)
Indemnification Obligation        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Realized and unrealized gains (losses) on financial instruments, net (note 3) (94,871) (3,485) (107,456) (58,311)
Exchangeable senior debentures        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Realized and unrealized gains (losses) on financial instruments, net (note 3) $ (150,004) $ (10,967) $ (177,952) $ (116,048)