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Capital Stock (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended
Jan. 07, 2021
USD ($)
$ / shares
shares
Mar. 31, 2022
USD ($)
director
classOfCommonShare
Mar. 31, 2021
USD ($)
May 14, 2021
USD ($)
Class of Stock [Line Items]        
Classes of common shares | classOfCommonShare   2    
Minimum number of directors up for election to entitle shareholders to vote | director   3    
Percentage of directors up for election if more than minimum number   33.33%    
Preferred stock dividends   $ 12,000 $ 11,067  
ION Media        
Class of Stock [Line Items]        
Exercise right of warrants ( in dollars per share) | $ / shares $ 13      
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
Preferred Stock | Berkshire Hathaway | ION Media        
Class of Stock [Line Items]        
Financing provided for business acquisition $ 600,000      
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   $ 12,000 $ 9,100  
Common stock, Class A | Berkshire Hathaway        
Class of Stock [Line Items]        
Number of shares purchasable by warrant (up to) | 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 (up to) | shares 23,100,000