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Capital Stock (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Jan. 07, 2021
USD ($)
$ / shares
shares
Sep. 30, 2022
USD ($)
director
classOfCommonShare
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
director
classOfCommonShare
Sep. 30, 2021
USD ($)
May 14, 2021
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 $ 12,000 $ 36,000 $ 35,067  
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         $ 280,000
Berkshire Hathaway | ION Media            
Class of Stock [Line Items]            
Exercise right of warrants (in dollars per share) | $ / shares $ 13          
Preferred stock | Berkshire Hathaway | ION Media            
Class of Stock [Line Items]            
Financing provided for business acquisition $ 600,000          
Preferred shares issued (in shares) | shares 6          
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       $ 36,000 $ 33,100  
Common stock, Class A | Berkshire Hathaway            
Class of Stock [Line Items]            
Number of shares purchasable by warrant (up to) (in shares) | shares 23,100          
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 (up to) (in shares) | shares 23,100