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Investment in National CineMedia (Details Textual) (USD $)
In Thousands, except Share data, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Investment in National CineMedia (Textual) [Abstract]    
Investment in NCM - receipt of common units $ 9,137 $ 9,302
Investment in National CineMedia (Additional Textual) [Abstract]    
Equity earnings (loss) from NCM (181) 1,072
Number of additional common units of NCM received under Common Unit Adjustment Agreement 598,724  
Total number of common units of NCM owned by Company 18,094,644  
Interest on common units of NCM owned by Company 16.00%  
Company's beverage concessionaire 5,547  
Remaining term of Exhibitor Services Agreement 24 years  
Deferred Revenue [Member]
    
Investment in National CineMedia (Textual) [Abstract]    
Investment in NCM - receipt of common units $ 9,137