INCOME TAXES - Income Tax Expense (Benefit) Continuing Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Deferred expense (benefit):
Federal	$ 43,105	$ 26,141	$ (2,095,930)
State	(28,174)	(93,744)	(784,224)
Total deferred benefit	14,931	(67,603)	(2,880,154)
Tax expense (benefit) relating to uncertain tax positions	(844)	(1,534)	11
Income Tax Expense (Benefit)	47,190	(38,655)	(2,862,352)
Current expense (benefit):
Federal	0	(1,865)	5,261
State	33,103	32,347	12,530
Total current expense (benefit)	33,103	30,482	17,791
CSC Holdings
Deferred expense (benefit):
Federal	(176,591)	(102,872)	(2,154,344)
State	(62,118)	(148,721)	(872,438)
Total deferred benefit	(238,709)	(251,593)	(3,026,782)
Tax expense (benefit) relating to uncertain tax positions	(844)	(985)	11
Income Tax Expense (Benefit)	71,243	57,563	(2,827,751)
Current expense (benefit):
Federal	240,229	186,035	151,120
State	70,567	124,106	47,900
Total current expense (benefit)	$ 310,796	$ 310,141	$ 199,020