Cash Flows (Summary Of Non-Cash Activities And Other Supplemental Data) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Cash Flows [Abstract]
Deemed capital contributions related to the utilization of Cablevision tax losses		$ 39,982
Deemed capital contribution, net related to adjustments to liability for uncertain tax positions and net deferred tax assets as a result of the Distribution		44,259
Capital distribution for the transfer of a promissory note receivable to Cablevision (see Promissory Note discussion below)		(17,113)
Deemed capital distribution to Cablevision related to employee benefit plans as a result of the Distribution (see Employee Matters Agreement discussion below)		(6,602)
Deemed capital distribution associated with the issuance of debt to Cablevision (see Issuance of Debt to Cablevision discussion below)		(1,250,000)	(1,250,000)
Deemed capital contribution related to the allocation of Cablevision share-based compensation expense		8,343
Leasehold improvements paid by landlord	2,071
Increase in capital lease obligations and related assets	1,399	39
Cash interest paid - continuing operations	57,564	51,630
Income taxes paid, net - continuing operations (see Income Taxes Paid discussion below)	$ 13,535	$ 5,574