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Investment in National CineMedia (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 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 from NCM	3,574	4,486
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	8,367
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)