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Significant Accounting Policies (Details 4) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 item | Dec. 31, 2012 item | Dec. 31, 2011 item
Acquired Unfavorable Real Estate Leases and Amortization |  |  |
Number of acquisitions of properties with leases | 3 | 2 | 5
Acquired unfavorable real estate leases |  |  |
Acquired Unfavorable Real Estate Leases and Amortization |  |  |
Amortization | $ 3,073,000 | $ 1,548,000 | $ 1,301,000
Estimated annual amortization for succeeding five years |  |  |
2014 | 3,267,000 |  |
2015 | 2,948,000 |  |
2016 | 2,387,000 |  |
2017 | 1,816,000 |  |
2018 | 1,397,000 |  |
2019 and thereafter | $ 2,360,000 |  |
Acquired unfavorable real estate leases | Minimum |  |  |
Acquired Unfavorable Real Estate Leases and Amortization |  |  |
Term of lease | 2 months |  |
Acquired unfavorable real estate leases | Maximum |  |  |
Acquired Unfavorable Real Estate Leases and Amortization |  |  |
Term of lease | 281 months |  |

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