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Significant Accounting Policies (Details 3) (USD $) | 12 Months Ended
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Dec. 31, 2011 acquisition | Dec. 31, 2010 acquisition | Dec. 31, 2009 acquisition
Acquired real estate leases and amortization |  |  |
Number of direct acquisitions of properties with leases | 5 | 1 | 3
Acquired in-place and above market real estate leases |  |  |
Acquired real estate leases and amortization |  |  |
Minimum term of lease (in months) | 19 |  |
Maximum term of lease (in months) | 281 |  |
Amortization expense | 13,697,000 | 11,636,000 | 12,885,000
Estimated annual amortization for succeeding five years |  |  |
2012 | 15,150,000 |  |
2013 | 16,018,000 |  |
2014 | 15,085,000 |  |
2015 | 14,374,000 |  |
2016 | 11,194,000 |  |
2017 and thereafter | 19,792,000 |  |

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