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Capital Stock (Details)
 3 Months Ended 6 Months Ended
Mar. 15, 2021
USD ($)
Jan. 07, 2021
USD ($)
$ / shares
shares
Jun. 30, 2021
USD ($)
director
classOfCommonShare
Jun. 30, 2021
USD ($)
director
classOfCommonShare
Jun. 30, 2020
USD ($)
May 14, 2021
USD ($)
Feb. 28, 2020
USD ($)
Class of Stock [Line Items]              
Classes of common shares | classOfCommonShare     2 2      
Minimum number of directors up for election to entitle shareholders to vote | director     3 3      
Percentage of directors up for election if more than minimum number     33.33% 33.33%      
Preferred stock dividends     $ 12,000,000 $ 23,067,000      
Losses on stock warrants       99,118,000 $ 0    
ION Media              
Class of Stock [Line Items]              
Exercise right of warrants ( in dollars per share) | $ / shares   $ 13          
Berkshire Hathaway              
Class of Stock [Line Items]              
Losses on stock warrants       $ 99,100,000      
Berkshire Hathaway | Fair Value, Inputs, Level 3              
Class of Stock [Line Items]              
Fair value of warrants, with option to settle for cash, for Class A common stock   $ 181,000,000       $ 280,000,000  
Preferred Stock | Berkshire Hathaway | ION Media              
Class of Stock [Line Items]              
Financing provided for business acquisition   $ 600,000,000          
Preferred shares issued | shares   6,000          
Face value of Preferred shares (in dollars per share) | $ / shares   $ 100,000          
Preferred shares redemption price, as a percent   105.00%          
Preferred stock dividend rate   8.00%          
Preferred stock dividend rate if dividends not paid in cash   9.00%          
Preferred stock dividends $ 21,100,000            
Common stock, Class A              
Class of Stock [Line Items]              
Stock repurchase program, authorized amount             $ 100,000,000
Common stock, Class A | Berkshire Hathaway              
Class of Stock [Line Items]              
Number of shares purchasable by warrant | shares   23,100,000          
Exercise right of warrants ( in dollars per share) | $ / shares   $ 13          
Common stock, Class A | Berkshire Hathaway | ION Media              
Class of Stock [Line Items]              
Number of shares purchasable by warrant | shares   23,100,000