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Investment in National CineMedia (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2012 | Mar. 31, 2011 | Dec. 31, 2011
Schedule Of Investment In Balance Sheet And Income Statement Location (Additional Textual) [Abstract] |  |  |
Investment in NCM - receipt of common units (see Note 6) | $ 9,137 | $ 9,302 |
Investment in National CineMedia (Textual) [Abstract] |  |  |
Equity income/loss from NCM | 716 | 904 |
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 | 2,722 |  |
Remaining term of exhibitor services agreement |  |  | 24 years
Deferred Revenue [Member] |  |  |
Schedule Of Investment In Balance Sheet And Income Statement Location (Additional Textual) [Abstract] |  |  |
Investment in NCM - receipt of common units (see Note 6) | $ (9,137) |  |

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