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Investment in National CineMedia (Details 1) (USD $) In Thousands | 3 Months Ended | 6 Months Ended | 3 Months Ended
--- | --- | --- | ---
Jun. 30, 2011 | Jun. 30, 2010 | Jun. 30, 2011 | Jun. 30, 2010 | Mar. 31, 2011 NCM [Member]
Summary financial information for NCM |  |  |  |  |
Gross revenues |  |  |  |  | $ 70,822
Operating income | 97,001 | 79,697 | 145,757 | 151,490 | 15,011
Net income | $ 41,009 | $ 40,759 | $ 66,331 | $ 77,470 | $ 5,070

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