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Real Estate Investments (Summary of Intangible Assets Acquired and Intangible Liabilities Assumed) (Details) (Three Logan Square [Member], USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2011 Years | Aug. 05, 2010
Intangible assets: |  |
Intangible assets acquired |  | $ 28,856
Weighted Average Amortization Period (in years) | 23 |
Intangible liabilities: |  |
Below market leases assumed |  | 683
Leases, Acquired-in-Place [Member] |  |
Intangible assets: |  |
Intangible assets acquired |  | 13,584
Weighted Average Amortization Period (in years) | 3 |
Customer Relationships [Member] |  |
Intangible assets: |  |
Intangible assets acquired |  | 8,870
Weighted Average Amortization Period (in years) | 5 |
Above market tenant leases acquired [Member] |  |
Intangible assets: |  |
Intangible assets acquired |  | 895
Weighted Average Amortization Period (in years) | 1 |
Below market ground lease acquired [Member] |  |
Intangible assets: |  |
Intangible assets acquired |  | 5,507
Weighted Average Amortization Period (in years) | 82 |
Intangible liabilities: |  |
Below market leases assumed |  | $ 683
Weighted Average Amortization Period (in years) | 1 |

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