FAIR VALUE MEASUREMENT (Tables)

12 Months Ended

Dec. 31, 2014

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on a Recurring Basis

The following table presents for each of these hierarchy levels, the Company's financial assets and financial liabilities that are measured at fair value on a recurring basis at December 31, 2014 and December 31, 2013:

At December 31, 2014
	Level I		Level II		Level III		Total
Assets:
Money market funds	$	736,330	$	—	$	—	$	736,330
Investment securities	132		—		—		132
Investment securities pledged as collateral	1,245,916		—		—		1,245,916
Prepaid forward contracts	—		7,317		—		7,317
Liabilities:
Liabilities under derivative contracts:
Prepaid forward contracts	—		102,217		—		102,217

At December 31, 2013
	Level I		Level II		Level III		Total
Assets:
Money market funds	$	608,225	$	—	$	—	$	608,225
Investment securities	138		—		—		138
Investment securities pledged as collateral	1,116,084		—		—		1,116,084
Prepaid forward contracts	—		3,385		—		3,385
Liabilities:
Liabilities under derivative contracts:
Prepaid forward contracts	—		146,947		—		146,947

Carrying Amounts and Estimated Fair Values of Financial Instruments, Excluding Those Carried at Fair Value

The carrying values, estimated fair values, and classification under the fair value hierarchy of the Company's financial instruments, excluding those that are carried at fair value in the accompanying consolidated balance sheets, are summarized as follows:

		December 31, 2014
	Fair Value Hierarchy	Carrying Amount		Estimated Fair Value
CSC Holdings notes receivable:
Cablevision senior notes held by Newsday Holdings (a)	Level II	$	611,455	$	680,587
Debt instruments:
Credit facility debt (b)	Level II	$	2,780,649	$	2,785,975
Collateralized indebtedness	Level II	986,183		957,803
Senior notes and debentures	Level II	3,062,126		3,368,875
Notes payable	Level II	23,911		23,682
CSC Holdings total debt instruments		6,852,869		7,136,335
Cablevision senior notes	Level II	2,793,741		3,048,387
Cablevision total debt instruments		$	9,646,610	$	10,184,722

		December 31, 2013
	Fair Value Hierarchy	Carrying Amount		Estimated Fair Value
CSC Holdings notes receivable:
Cablevision senior notes held by Newsday Holdings (a)	Level II	$	611,455	$	682,887
Debt instruments:
Credit facility debt (b)	Level II	$	3,766,145	$	3,776,760
Collateralized indebtedness	Level II	817,950		809,105
Senior notes and debentures	Level II	2,309,403		2,608,885
Notes payable	Level II	5,334		5,334
CSC Holdings total debt instruments		6,898,832		7,200,084
Cablevision senior notes	Level II	2,829,112		3,101,373
Cablevision total debt instruments		$	9,727,944	$	10,301,457

(a) These notes are eliminated at the consolidated Cablevision level.

(b) The principal amount of the Company's credit facility debt, which bears interest at variable rates, approximates its fair value.