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Investment in National CineMedia (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 3 Months Ended 6 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Jun. 28, 2012
National CineMedia, LLC [Member]
Jun. 28, 2012
National CineMedia, LLC [Member]
Summary financial information for NCM            
Gross revenues         $ 110,098 $ 189,234
Operating income 94,153 101,310 297,550 247,067 45,382 62,330
Net income $ 47,967 $ 47,648 $ 142,982 $ 113,979 $ 1,872 $ 5,023