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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.

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