Cash Flows (Summary Of Non-Cash Activities And Other Supplemental Data) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Leasehold Improvements Paid By Landlord	$ 100	$ 2,938	$ 150
Capital Lease Obligations Incurred	865	1,398	39
Capital Expenditures Incurred but Not yet Paid	3,202	5,397	0
Deemed Capital (Distribution) Contribution Related To The Utilization Of Related Party Tax Losses By Company	0	(1,794)	36,867
Deemed Capital (Distribution) Contribution, Net, Related To Taxes	0	(1,148)	44,598
Capital Distribution Of Promissory Note Receivable To Related Party	0	0	(17,113)
Deemed Capital Distribution To Cablevision Related To Employee Benefit Plans As A Result Of The Distribution	0	0	(6,313)
Deemed Capital Distribution Related To Tax Credits Utilized By Related Party	0	0	(2,586)
Deemed Capital Distribution Associated With The Issuance Of Debt To Related Party	0	0	(1,250,000)
Deemed Capital Contribution Related To Allocation Of Related Party Share Based Compensation Expense	0	0	8,343
Cash Interest Paid, Continuing Operations	112,053	113,493	78,714
Income Taxes Paid, Net, Continuing Operations	$ 135,708	$ 40,522	$ 11,569