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Significant Accounting Policies (Details 4) (Acquired unfavorable real estate leases, USD $) | 12 Months Ended
--- | ---
Dec. 31, 2011 M | Dec. 31, 2010 | Dec. 31, 2009
Acquired unfavorable real estate leases |  |  |
Acquired Unfavorable Real Estate Leases and Amortization |  |  |
Minimum term of lease (in months) | 23 |  |
Maximum term of lease (in months) | 281 |  |
Amortization | $ 1,301,000 | $ 1,147,000 | $ 992,000
Estimated annual amortization for succeeding five years |  |  |
2012 | 1,454,000 |  |
2013 | 1,357,000 |  |
2014 | 1,235,000 |  |
2015 | 1,182,000 |  |
2016 | 809,000 |  |
2017 and thereafter | $ 1,581,000 |  |

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