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AFFILIATE AND RELATED PARTY TRANSACTIONS - Narrative (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] |  |  |  |  |
Equity in net income (loss) from investment in related party |  |  | $ (10,849) | $ (5,697) |
Related party expense | $ 2,031 | $ 9,072 | 20,298 | 630,600 |
Payments to Acquire Other Investments |  |  | 2,500 | 4,800 |
Fees for Executive Services | Affiliates |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction, annual fee | 30,000 |  | 30,000 |  |
Related party expense |  | 7,500 | 13,250 | 22,500 |
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 |
I24News and Altice NV 24/7 |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Investment in affiliates and related parties |  |  |  |  | $ 930
Equity in net income (loss) from investment in related party |  | 541 | 1,130 | 3,126 |
Newsday |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Investment in affiliates and related parties |  |  |  |  | $ 3,579
Equity in net income (loss) from investment in related party |  | 1,034 | 9,719 | 2,571 |
Gainonsaleofequityinvestment |  |  | 13,298 |  |
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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