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DEBT - Summary of Debt Maturities (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
Debt Instrument [Line Items]  
2018 $ 37,124
2020 642,209
2021 563,116
2022 4,346,621
2021 709,886
Thereafter 17,281,404
Cablevision  
Debt Instrument [Line Items]  
2018 30,678
2020 598,210
2021 550,396
2022 3,083,892
2021 697,147
Thereafter 11,815,174
Cequel Corp. [Member]  
Debt Instrument [Line Items]  
2018 6,446
2020 43,999
2021 12,720
2022 1,262,729
2021 12,739
Thereafter $ 5,466,230