Investment in National CineMedia (Details Textual) (USD $) In Thousands, except Share data	1 Months Ended	6 Months Ended
	Mar. 31, 2011	Jun. 30, 2011	Jun. 30, 2010
Investment in National CineMedia (Textuals) [Abstract]
Number of additional common units of NCM received under common unit adjustment agreement	549,417
Change in company's ownership interest in NCM due to common unit adjustment	15.3% to 15.8%
Total number of common units of NCM owned by Company		17,495,920
Other revenues excluding amortization of deferred revenue		$ 2,722	$ 2,434
Company's beverage concessionaire		5,313	5,183
Remaining term of exhibitor services agreement	26 years
NCM [Member]
Schedule of Investment in Balance Sheet and Income Statement Location (Textuals)
Equity in loss of affiliates		1,072	1,028
Deferred Revenue [Member]
Schedule of Investment in Balance Sheet and Income Statement Location (Textuals)
Investment in NCM - receipt of common units (see Note)	$ 9,302