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DEBT - Summary of Debt Maturities (Details)
$ in Thousands
Jun. 30, 2018
USD ($)
Debt Instrument [Line Items]  
2018 $ 552,511
2020 639,227
2021 561,275
2022 3,769,705
2021 708,643
Thereafter 17,279,589
Cablevision  
Debt Instrument [Line Items]  
2018 540,854
2020 595,243
2021 548,570
2022 2,506,990
2021 695,917
Thereafter 11,813,209
Cequel Corp. [Member]  
Debt Instrument [Line Items]  
2018 11,657
2020 43,984
2021 12,705
2022 1,262,715
2021 12,726
Thereafter $ 5,466,380