Quarterly report pursuant to Section 13 or 15(d)

Investments in Affiliates Accounted for Using the Equity Method (Summary of Financial Information) (Details)

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Investments in Affiliates Accounted for Using the Equity Method (Summary of Financial Information) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]                
Current assets $ 681,710   $ 681,710     $ 727,823    
Investments in affiliates 167,121   167,121     167,643    
Other assets 339,482   339,482     295,693    
Total assets 11,933,130   11,933,130     11,933,445    
Long-term debt 2,602,296   2,602,296     3,263,210    
Deferred income tax liabilities 1,531,407   1,531,407     1,527,109    
Other liabilities 118,744   118,744     133,020    
Equity 6,210,255 $ 5,416,779 6,210,255 $ 5,416,779 $ 5,615,114 6,210,284 $ 4,948,982 $ 4,306,690
Total liabilities and shareholders' equity 11,933,130   11,933,130     11,933,445    
Operating expenses, net (222,160) (233,819) (447,376) (484,199)        
Operating income (loss) 2,660 (16,253) 13,243 (48,897)        
Share of earnings (loss) of affiliates, net 2,238 (1,068) 1,531 (4,364)        
Realized and unrealized gains (losses) on financial instruments, net 860,867 679,098 26,875 1,688,698        
Other income (expense), net 842,920 656,692 (36,187) 1,637,227        
Income tax benefit (expense) (234,952) (181,395) 1,670 (450,800)        
Net earnings (loss) $ 610,654 459,044 $ (21,223) 1,137,587        
Liberty Broadband                
Schedule of Equity Method Investments [Line Items]                
Equity Method Investment, Ownership Percentage 23.50%   23.50%          
Current assets $ 19,706   $ 19,706     52,133    
Investments in affiliates 12,306,593   12,306,593     12,194,674    
Other assets 9,100   9,100     9,535    
Total assets 12,335,399   12,335,399     12,256,342    
Long-term debt 573,593   573,593     572,944    
Deferred income tax liabilities 1,017,921   1,017,921     999,757    
Other liabilities 23,151   23,151     15,695    
Equity 10,720,734   10,720,734     10,667,946    
Total liabilities and shareholders' equity 12,335,399   12,335,399     $ 12,256,342    
Revenues 4,114 3,747 8,218 7,205        
Operating expenses, net (13,946) (10,913) (25,325) (20,572)        
Operating income (loss) (9,832) (7,166) (17,107) (13,367)        
Share of earnings (loss) of affiliates, net 158,128 45,400 219,810 80,249        
Gain (loss) on dilution of investment in affiliate (46,001) (16,322) (105,326) (57,725)        
Other income (expense), net (5,103) (5,936) (10,801) (12,056)        
Income tax benefit (expense) (24,978) (3,924) (22,204) 650        
Net earnings (loss) $ 72,214 $ 12,052 $ 64,372 $ (2,249)