Cash Flows (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Cash Flows [Line Items]
Principal Amount Of Promissory Note		$ 0
Debt Instrument, Interest Rate, Stated Percentage		8.625%
Interest Income	120,000
Noncash Capital Distribution Of Note Receivable To Related Party	17,113,000
Net Receivable	1,166,000
Increase In Related Parties Employee Related Liabilities	(7,479,000)
Noncash Capital Distribution To Related Party Related To Employee Benefit Plans As A Result Of The Distribution	6,313,000
Unfunded Liability In Cash Balance Pension Plan	5,904,000
Increase In Due To Related Parties	6,742,000
Cablevision Excess Savings Plan [Member]
Cash Flows [Line Items]
Increase In Related Parties Employee Related Liabilities	(3,616,000)
Cablevision Excess Cash Balance Pension Plan [Member]
Cash Flows [Line Items]
Increase In Related Parties Employee Related Liabilities	$ (3,863,000)