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Significant Accounting Policies (Details 4) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 item | Dec. 31, 2011 item | Dec. 31, 2010 item
Acquired Unfavorable Real Estate Leases and Amortization |  |  |
Number of acquisitions of properties with leases | 2 | 5 | 1
Acquired unfavorable real estate leases |  |  |
Acquired Unfavorable Real Estate Leases and Amortization |  |  |
Minimum term of lease | 12 months |  |
Maximum term of lease | 281 months |  |
Amortization | 1,548,000 | 1,301,000 | 1,147,000
Estimated annual amortization for succeeding five years |  |  |
2013 | 1,863,000 |  |
2014 | 1,722,000 |  |
2015 | 1,614,000 |  |
2016 | 1,136,000 |  |
2017 | 801,000 |  |
2018 and thereafter | 1,174,000 |  |

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