CSC HOLDINGS - CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current Assets:
Cash and cash equivalents	$ 232,452	$ 278,422
Restricted cash	264	264
Accounts receivable, trade (less allowance for doubtful accounts of $13,420 and $11,677)	434,011	442,581
Prepaid expenses and other current assets (including a prepayment to an affiliate of $19,563 in 2017) (See Note 14)	170,555	200,252
Amounts due from affiliates	3,892	4,262
Derivative contracts	3,555	50,785
Total current assets	844,729	976,566
Property, plant and equipment, net	6,092,271	5,805,996
Right-of-use operating lease assets	227,059	241,342
Investment securities pledged as collateral	2,402,486	2,250,854
Derivative contracts	0	4,774
Other assets	81,928	87,429
Amortizable intangible assets, net of accumulated amortization	2,361,507	2,781,116
Indefinite-lived cable television franchises	13,216,355	13,068,017
Goodwill	8,206,365	8,160,566
Total assets	33,432,700	33,376,660
Current Liabilities:
Accounts payable	892,694	795,576
Interest payable	237,068	252,060
Accrued employee related costs	125,492	142,116
Amounts due to affiliates	20,972	8,538
Deferred revenue	109,522	109,798
Debt	1,889,730	1,245,713
Other current liabilities	393,417	544,302
Total current liabilities	3,668,895	3,098,103
Other liabilities	146,743	192,563
Deferred tax liability	5,105,353	5,006,167
Liabilities under derivative contracts	518,246	523,150
Right-of-use operating lease liability	244,317	257,424
Long-term debt, net of current maturities	24,881,833	25,476,629
Total liabilities	34,565,387	34,554,036
Commitments and contingencies (Note 16)
Redeemable equity	0	25,763
Limited Liability Company (LLC) Members' Equity [Abstract]
Accumulated other comprehensive income (loss)	9,421	3,646
Noncontrolling interests	(46,158)	(62,109)
Total liabilities and stockholders' deficiency	33,432,700	33,376,660
CSC Holdings
Current Assets:
Cash and cash equivalents	229,895	277,938
Restricted cash	264	264
Accounts receivable, trade (less allowance for doubtful accounts of $13,420 and $11,677)	434,011	442,581
Prepaid expenses and other current assets (including a prepayment to an affiliate of $19,563 in 2017) (See Note 14)	170,555	200,252
Amounts due from affiliates	3,892	4,262
Derivative contracts	3,555
Total current assets	842,172	976,082
Property, plant and equipment, net	6,092,271	5,805,996
Right-of-use operating lease assets	227,059	241,342
Investment securities pledged as collateral	2,402,486	2,250,854
Derivative contracts	0	4,774
Other assets	81,928	87,429
Amortizable intangible assets, net of accumulated amortization	2,361,507	2,781,116
Indefinite-lived cable television franchises	13,216,355	13,068,017
Goodwill	8,206,365	8,160,566
Total assets	33,430,143	33,376,176
Current Liabilities:
Accounts payable	892,694	795,576
Interest payable	237,068	252,060
Accrued employee related costs	125,492	142,116
Amounts due to affiliates	20,972	8,538
Deferred revenue	109,522	109,798
Debt	1,889,730	1,245,713
Other current liabilities	393,417	543,834
Total current liabilities	3,668,895	3,097,635
Other liabilities	146,743	192,563
Deferred tax liability	5,121,419	5,033,980
Liabilities under derivative contracts	518,246	523,150
Right-of-use operating lease liability	244,317	257,424
Long-term debt, net of current maturities	24,881,833	25,476,629
Total liabilities	34,581,453	34,581,381
Redeemable equity	0	25,763
Limited Liability Company (LLC) Members' Equity [Abstract]
Membership interest before accumulated comprehensive loss	(1,114,573)	(1,172,505)
Accumulated other comprehensive income (loss)	9,421	3,646
Membership equity before noncontrolling interest	(1,105,152)	(1,168,859)
Noncontrolling interests	(46,158)	(62,109)
Total Deficiency	(1,151,310)	(1,230,968)
Total liabilities and stockholders' deficiency	$ 33,430,143	$ 33,376,176