DEBT - Schedule of Gain (Loss) on Debt Extinguishment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Debt Instrument [Line Items]
Loss on extinguishment of debt and write-off of deferred financing costs	$ 0	$ 157,902
Loss on extinguishment of debt and write-off of deferred financing costs	0	(157,902)
CSC Holdings
Debt Instrument [Line Items]
Loss on extinguishment of debt and write-off of deferred financing costs	0	157,902
Loss on extinguishment of debt and write-off of deferred financing costs	$ 0	(157,902)
10.125% Notes due January 15, 2023
Debt Instrument [Line Items]
Loss on extinguishment of debt and write-off of deferred financing costs		154,666
Loss on extinguishment of debt and write-off of deferred financing costs		(154,666)
CSC Holdings Term Loan Facility
Debt Instrument [Line Items]
Loss on extinguishment of debt and write-off of deferred financing costs		3,236
Loss on extinguishment of debt and write-off of deferred financing costs		$ (3,236)