INCOME TAXES - Income Tax Expense (Benefit) Continuing Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Tax Expense (Benefit)	$ 105,226	$ 33,186	$ 279,053	$ 109,047
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	375,975	30,457	1,029,275	216,257
Reevaluation of deferred tax liability relating to state tax increase		16,878
CSC Holdings
Income Tax Expense (Benefit)	105,226	33,132	276,756	94,790
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	$ 375,975	$ 30,258	$ 1,029,275	$ 215,711