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Real Estate Investments (Details 2) (Three Logan Square [Member], USD $) In Thousands, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Jun. 30, 2011 | Aug. 05, 2010
Intangible assets |  |
Intangible assets acquired |  | $ 28,856
Weighted Average Amortization Period (in years) | 23 |
Intangible liabilities: |  |
Below market leases assumed |  | 683
Weighted Average Amortization Period (in years) | 1 |
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

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