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 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]                
Current assets $ 897,884   $ 897,884     $ 727,823    
Investments in affiliates 157,484   157,484     167,643    
Other assets 192,741   192,741     295,693    
Total assets 13,359,842   13,359,842     11,933,445    
Long-term debt 2,599,521   2,599,521     3,263,210    
Deferred income tax liabilities 1,865,998   1,865,998     1,527,109    
Other liabilities 116,301   116,301     133,020    
Equity 7,032,690 $ 5,506,769 7,032,690 $ 5,506,769 $ 6,210,255 6,210,284 $ 5,416,779 $ 4,306,690
Total liabilities and shareholders' equity 13,359,842   13,359,842     11,933,445    
Operating expenses, net (236,820) (231,218) (684,196) (715,417)        
Operating income (loss) 10,072 (4,174) 23,315 (53,071)        
Share of earnings (loss) of affiliates, net (9,035) 1,921 (7,504) (2,443)        
Realized and unrealized gains (losses) on financial instruments, net 1,172,685 156,165 1,199,560 1,844,863        
Other income (expense), net 1,152,760 121,555 1,116,573 1,758,782        
Income tax benefit (expense) (338,446) (28,087) (336,776) (478,887)        
Net earnings (loss) $ 824,412 89,322 $ 803,189 1,226,909        
Liberty Broadband                
Schedule of Equity Method Investments [Line Items]                
Equity Method Investment, Ownership Percentage 23.70%   23.70%          
Current assets $ 402,492   $ 402,492     52,133    
Investments in affiliates 12,450,425   12,450,425     12,194,674    
Other assets 8,772   8,772     9,535    
Total assets 12,861,689   12,861,689     12,256,342    
Long-term debt 1,318,664   1,318,664     572,944    
Deferred income tax liabilities 1,036,672   1,036,672     999,757    
Other liabilities 19,103   19,103     15,695    
Equity 10,487,250   10,487,250     10,667,946    
Total liabilities and shareholders' equity 12,861,689   12,861,689     $ 12,256,342    
Revenues 4,219 3,713 12,437 10,918        
Operating expenses, net (20,547) (11,301) (45,872) (31,873)        
Operating income (loss) (16,328) (7,588) (33,435) (20,955)        
Share of earnings (loss) of affiliates, net 188,586 61,633 408,396 141,882        
Gain (loss) on dilution of investment in affiliate (35,284) (11,219) (140,610) (68,944)        
Realized and unrealized gains (losses) on financial instruments, net (39,324) (433) (39,324) (433)        
Other income (expense), net (3,711) (5,773) (14,512) (17,829)        
Income tax benefit (expense) (24,979) (9,124) (47,183) (8,474)        
Net earnings (loss) $ 68,960 $ 27,496 $ 133,332 $ 25,247