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AFFILIATE AND RELATED PARTY TRANSACTIONS - Amounts Due From and Due to Related Parties (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Related Party Transaction [Line Items] |  |  |  |  |
Payments to Acquire Other Investments |  |  | $ 2,500 | $ 4,800 |
Affiliates |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Due from related parties and affiliates | $ 18,387 |  | 18,387 |  | $ 19,764
Due to related parties and affiliates | 23,424 |  | 23,424 |  | 10,998
Affiliates | Altice Dominican Republic [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Due from related parties and affiliates | 2,551 |  | 2,551 |  | 0
Affiliates | Altice US Finance S.A. |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Due from related parties and affiliates | 13,100 |  | 13,100 |  | 12,951
Affiliates | Newsday |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Due from related parties and affiliates | 541 |  | 541 |  | 2,713
Due to related parties and affiliates | 32 |  | 32 |  | 33
Affiliates | Altice Management Americas |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Due from related parties and affiliates | 1,271 |  | 1,271 |  | 33
Affiliates | I24 |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Due from related parties and affiliates | 0 |  | 0 |  | 4,036
Affiliates | Altice Labs S.A. |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Due to related parties and affiliates | 1,463 |  | 1,463 |  | 7,354
Affiliates | Other Altice N.V. subsidiaries |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Due from related parties and affiliates | 924 |  | 924 |  | 31
Due to related parties and affiliates | 8,679 |  | 8,679 |  | 3,611
Affiliates | Altice Management International |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Due to related parties and affiliates | 13,250 |  | 13,250 |  | $ 0
Equipment and Software Development Costs [Member] | Affiliates |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Payments to Acquire Other Investments | 3,945 | $ 3,549 | 6,679 | 12,914 |
Other Operating Income (Expense) [Member] | Transition Services [Member] | Affiliates |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related Party Transaction, Other Expenses from Transactions with Related Party | $ 905 | 802 | $ 1,904 | 1,766 |
Related Party Transaction, Other Revenues from Transactions with Related Party |  | $ 76 |  | $ 917 |

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