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Investment in National CineMedia (Details 1) (USD $)
In Thousands
3 Months Ended9 Months Ended6 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Jun. 30, 2011
NCM [Member]
Summary financial information for NCM     
Gross revenues    $ 184,785
Operating income101,31073,788247,067225,27865,159
Net income$ 47,648$ 33,883$ 113,979$ 111,353$ 42,632