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Investment in National CineMedia (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
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