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AFFILIATE AND RELATED PARTY TRANSACTIONS - Amounts Due From and Due to Related Parties (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired |  | 6,629,415 |  |  | 25,655 |  |
Payments for Repurchase of Common Stock |  |  |  |  | $ 725,518 | $ 1,381,235 |
Share based compensation expense | $ 27,646 |  | $ 34,318 |  | 55,927 | 62,264 |
Related party expense | 4,165 |  | 520 |  | $ 6,166 | 3,162 |
Stock options | 2017 LTIP |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  |  | 896,398 |  |
Share based compensation expense | 24,473 |  | 25,327 |  | $ 48,696 | 45,676 |
Restricted Stock | 2019 LTIP |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Share based compensation expense | 261 |  | 635 |  | 578 | 1,211 |
CSC Holdings |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Cash distributions to parent | (184,478) | $ (501,000) | (652,383) | $ (720,350) | (685,478) | (1,372,733) |
Intercompany settlement |  |  | 35,415 |  |  |  |
Cash distributions |  |  |  |  | 685,478 | 1,372,733 |
Non-cash distributions to parent | (19,660) | (748) |  | (150,602) |  |  |
CSC Holdings | Member's Equity (Deficiency) |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Cash distributions to parent | (184,478) | (501,000) | (652,383) | (720,350) |  |  |
Intercompany settlement |  |  | $ 35,415 |  |  |  |
Non-cash distributions to parent | (19,660) | $ (748) |  | $ (150,602) | (20,408) | $ (115,187) |
Affiliates |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Due to related parties and affiliates | 14,450 |  |  |  | 14,450 |  | $ 8,538
Affiliates | Other Related Party |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Due from related parties and affiliates | 3,669 |  |  |  | 3,669 |  | 4,262
Due to related parties and affiliates | 864 |  |  |  | 864 |  | 600
Affiliates | Altice Management International |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Due to related parties and affiliates | $ 13,586 |  |  |  | $ 13,586 |  | $ 7,938

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