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Capital Stock and Share Based Compensation Plans - Narrative (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Jan. 07, 2021
USD ($)
$ / shares
shares
Feb. 28, 2019
$ / shares
shares
Nov. 30, 2016
USD ($)
Sep. 30, 2018
USD ($)
shares
Dec. 31, 2020
USD ($)
director
classOfCommonShare
shares
Dec. 31, 2019
USD ($)
$ / shares
Dec. 31, 2018
USD ($)
$ / shares
Jun. 30, 2020
$ / shares
Feb. 28, 2020
USD ($)
Class of Stock [Line Items]                  
Classes of common shares | classOfCommonShare         2        
Share price | $ / shares               $ 8.75  
Stock repurchased during period, value           $ 584,000 $ 32,323,000 [1]    
Accelerated share repurchases, payment       $ (25,000,000)          
Accelerated share repurchase program, agreement to repurchase     $ 25,000,000            
Shares repurchased and retired during period | shares   147,164   1,300,000          
Percent of total shares repurchased under ASR       80.00%          
Treasury stock acquired, weighted average cost per share (in usd per share) | $ / shares   $ 16.70              
Number of shares available for future stock compensation grants | shares         3,800,000        
Minimum                  
Class of Stock [Line Items]                  
Minimum number of directors up for election to entitle shareholders to vote         0.3333        
Maximum                  
Class of Stock [Line Items]                  
Minimum number of directors up for election to entitle shareholders to vote | director         3        
Common Stock                  
Class of Stock [Line Items]                  
Stock repurchased during period, value         $ 50,300,000        
Common stock, Class A                  
Class of Stock [Line Items]                  
Stock repurchased during period, value         $ 0 $ 600,000 $ 7,300,000    
Stock repurchase program, authorized amount     $ 100,000,000           $ 100,000,000
Common stock, Class A | Minimum                  
Class of Stock [Line Items]                  
Price paid per share for stock repurchased during the period | $ / shares           $ 15.54 $ 13.29    
Common stock, Class A | Maximum                  
Class of Stock [Line Items]                  
Price paid per share for stock repurchased during the period | $ / shares           $ 18.72 $ 17.86    
Stock Options | Common stock, Class A | Maximum                  
Class of Stock [Line Items]                  
Purchase price of stock options granted, percent of fair market value         100.00%        
Restricted Stock Units (RSUs)                  
Class of Stock [Line Items]                  
Total unrecognized compensation cost related to restricted stock, RSUs and performance shares         $ 15,400,000        
Weighted-average period of recognition, years         1 year 6 months        
Restricted Stock Units (RSUs) | Minimum                  
Class of Stock [Line Items]                  
Vesting period of stock options         3 years        
Restricted Stock Units (RSUs) | Maximum                  
Class of Stock [Line Items]                  
Vesting period of stock options         4 years        
Subsequent Event | ION Media                  
Class of Stock [Line Items]                  
Exercise price of warrants | $ / shares $ 13                
Subsequent Event | Preferred Stock | Berkshire Hathaway | ION Media                  
Class of Stock [Line Items]                  
Purchase of equity $ 600,000,000                
Number of shares purchased | shares 6,000                
Share price | $ / shares $ 100,000                
Preferred stock, redemption price, percent 105.00%                
Preferred stock, dividend rate, percentage 8.00%                
Dividend rate if previous dividends are not paid in cash, as a percentage 9.00%                
Number of warrants | shares 23,100,000                
Exercise price of warrants | $ / shares $ 13                
Subsequent Event | Common stock, Class A | ION Media                  
Class of Stock [Line Items]                  
Number of warrants | shares 23,100,000                
[1] * Net of tax payments related to shares withheld for vested stock and RSUs of $2,881 in 2020, $3,831 in 2019 and $3,796 in 2018.