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Capital Stock (Details)
 3 Months Ended 40 Months Ended
Mar. 15, 2021
USD ($)
Jan. 07, 2021
USD ($)
$ / shares
shares
Mar. 31, 2021
USD ($)
director
classOfCommonShare
Feb. 29, 2020
USD ($)
Feb. 28, 2020
USD ($)
Nov. 30, 2016
USD ($)
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     $ 11,067,000      
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   $ 600,000,000        
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 $ 9,100,000          
Number of shares purchasable by warrant | shares   23,100,000        
Exercise right of warrants ( in dollars per share) | $ / shares   $ 13        
Common stock, Class A            
Class of Stock [Line Items]            
Stock repurchase program, authorized amount         $ 100,000,000 $ 100,000,000
Stock repurchased during period, value     $ 0 $ 50,300,000    
Common stock, Class A | Berkshire Hathaway | ION Media            
Class of Stock [Line Items]            
Number of shares purchasable by warrant | shares   23,100,000