INCOME TAXES - Effective Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Federal tax expense at statutory rate	$ 274,240	$ 122,478	$ 39,297
State income taxes, net of federal impact	21,492	59,383	(6,256)
Changes in the valuation allowance	13,573	10,333	4,079
Changes in the state rates used to measure deferred taxes, net of federal impact	(6,924)	(46,768)	1,046
Tax expense (benefit) relating to uncertain tax positions	29,669	(1,568)	(847)
Effective Income Tax Rate Reconciliation, Tax Credit, Amount	7,589	17,205	0
Non-deductible share-based compensation related to the carried unit plan	169	2,108	15,642
Non-deductible officers compensation	7,201	6,715	0
Other permanent differences	(35,256)	0	0
Other non-deductible expenses (benefits)	1,483	(883)	1,334
Other, net	(3,083)	5,155	(5,013)
Income tax expense	294,975	139,748	47,190
CSC Holdings
Federal tax expense at statutory rate	274,240	122,363	59,653
State income taxes, net of federal impact	13,973	58,802	(9,060)
Changes in the valuation allowance	12,793	10,598	4,307
Changes in the state rates used to measure deferred taxes, net of federal impact	(7,125)	(46,768)	(6,532)
Tax expense (benefit) relating to uncertain tax positions	29,669	(1,568)	(847)
Effective Income Tax Rate Reconciliation, Tax Credit, Amount	7,589	17,205	0
Non-deductible share-based compensation related to the carried unit plan	169	2,108	15,642
Non-deductible officers compensation	7,201	6,715	0
Other permanent differences	35,256	0	0
Other non-deductible expenses (benefits)	1,483	(886)	1,334
Other, net	7,552	(7,316)	(6,318)
Income tax expense	$ 297,110	$ 126,843	$ 71,243