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Subsequent Events (Details) (USD $)
In Thousands, except Per Share data
1 Months Ended6 Months Ended
Feb. 15, 2011
Jun. 30, 2011
Mar. 21, 2011
Feb. 15, 2011
Common Class A [Member]
Jun. 30, 2010
Common Class A [Member]
Notes To Financial Statements [Abstract]     
Dividend declaration dateFeb. 15, 2011
Dividend payable (in dollars per share)$ 0.125    
Dividend payable dateMar. 21, 2011
Dividend date of recordFeb. 28, 2011
Equity, Class of Treasury Stock [Line Items]     
Amount authorized to repurchase common stock   $ 500,000$ 500,000
Credit Facility Debt [Abstract]     
Satisfaction and discharge of debt with AMC Networks debt $ 1,250,000