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Cash Flows (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
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   120 660
Noncash Capital Distribution Of Note Receivable To Related Party   17,113  
Net Receivable   1,166  
Increase In Related Parties Employee Related Liabilities   (7,479)  
Noncash Capital Distribution To Cablevision Related To Employee Benefit Plans As A Result Of The Distribution   6,313  
Unfunded Liability In Cash Balance Pension Plan   5,904  
Increase In Due To Related Parties   6,742  
Increase In Income Taxes Paid, After Utilization Of NOLs 28,953    
Cablevision Excess Savings Plan [Member]
     
Cash Flows [Line Items]      
Increase In Related Parties Employee Related Liabilities   (3,616)  
Cablevision Excess Cash Balance Pension Plan [Member]
     
Cash Flows [Line Items]      
Increase In Related Parties Employee Related Liabilities   $ (3,863)