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Investment in National CineMedia (Details 1) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Mar. 31, 2012 | Mar. 31, 2011 | Mar. 31, 2012 National CineMedia, LLC [Member] | Dec. 31, 2011 National CineMedia, LLC [Member]
Summary financial information for NCM |  |  |  |
Gross revenues |  |  | $ 0 | $ 435,434
Operating income | 89,488 | 48,756 | 0 | 193,716
Net income | $ 42,876 | $ 25,322 | $ 0 | $ 134,524

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