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STOCKHOLDERS' DEFICIT - Narrative (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
May 01, 2019
$ / shares
shares
Dec. 31, 2024
USD ($)
vote
shares
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2022
USD ($)
shares
Nov. 05, 2020
Jul. 25, 2019
Class of Stock [Line Items]            
Stock options granted (in shares)   0 0 0    
Common stock, conversion ratio   1        
Number of shares called by each warrant (in shares) 1          
FCC petitions for declaratory ruling, percentage of voting stock and equity owned by non-US individuals and entities (up to)           25.00%
FCC petitions for declaratory ruling, foreign-owned percentage permitted (up to)         100.00%  
Tax benefit related to share-based compensation expense | $   $ 3.7 $ 4.7 $ 5.2    
Stock Options            
Class of Stock [Line Items]            
Stock options granted (in shares)   0        
Unrecognized compensation cost related to arrangements that will vest based on service conditions | $   $ 30.1        
Weighted average period for recognition   1 year 6 months        
Restricted stock units            
Class of Stock [Line Items]            
Award dividend equivalent, number of common stock (in shares)   1        
Restricted stock units | Minimum            
Class of Stock [Line Items]            
Vesting period of options   1 year        
Restricted stock units | Maximum            
Class of Stock [Line Items]            
Vesting period of options   3 years        
Class A Common Stock            
Class of Stock [Line Items]            
Common stock, vote per share | vote   1        
Class A Common Stock | Common Stock            
Class of Stock [Line Items]            
Conversion of Class B Shares to Class A Shares (in shares) [1]   61,449 129,877 209,613    
Conversion of Special Warrants to Class A and Class B Shares (in shares) [1]   62,547 9,383 96,516    
Class B Common Stock            
Class of Stock [Line Items]            
Common stock, vote per share | vote   1        
Class B Common Stock | Common Stock            
Class of Stock [Line Items]            
Conversion of Class B Shares to Class A Shares (in shares) [1]   (61,449) (129,877) (209,613)    
Conversion of Special Warrants to Class A and Class B Shares (in shares) [1]     59 96,602    
Special Warrants            
Class of Stock [Line Items]            
Exercise price of warrants or rights (in dollars per share) | $ / shares $ 0.001          
Conversion terms, ownership of common stock, percent 4.99%          
Conversion terms, ownership of capital stock or voting interests, percent 22.50%          
FCC petitions for declaratory ruling, percentage of voting stock and equity owned by non-US individuals and entities (up to)           22.50%
FCC petitions for declaratory ruling, foreign-owned percentage permitted (up to)         100.00%  
Special Warrants | Common Stock            
Class of Stock [Line Items]            
Conversion of Special Warrants to Class A and Class B Shares (in shares) [1]   (62,547) (9,442) (193,118)    
2021 Plan            
Class of Stock [Line Items]            
Stock options granted (in shares)   0        
2021 Plan | Stock Options            
Class of Stock [Line Items]            
Term of options granted   10 years        
2021 Plan | Awards granted upon emergence            
Class of Stock [Line Items]            
Term of options granted   6 years        
2021 Plan | All other options            
Class of Stock [Line Items]            
Term of options granted   10 years        
2021 Plan | Restricted stock units            
Class of Stock [Line Items]            
Award dividend equivalent, number of common stock (in shares)   1        
2021 Plan | Performance RSUs            
Class of Stock [Line Items]            
Award dividend equivalent, number of common stock (in shares)   1        
2021 Plan | Class A Common Stock            
Class of Stock [Line Items]            
Number of shares authorized (in shares) 19,000,000          
Available for issuance (in shares) 10,743,222          
2019 Plan            
Class of Stock [Line Items]            
Stock options granted (in shares)   0        
2019 Plan | Restricted stock units            
Class of Stock [Line Items]            
Award dividend equivalent, number of common stock (in shares)   1        
2019 Plan | Performance RSUs            
Class of Stock [Line Items]            
Award dividend equivalent, number of common stock (in shares)   1        
[1] The Company's Preferred Stock is not presented in the data above as there were no shares issued and outstanding in 2024, 2023, 2022, or 2021.