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Real Estate Investments (Acquisitions and Dispositions) (Details) (USD $) In Millions, unless otherwise specified | Jan. 06, 2012 Plymouth Meeting, Pennsylvania [Member] sqft | Jun. 22, 2012 Pacific Ridge Corporate Center [Member] sqft | Mar. 22, 2012 South Lake at Dulles Corner [Member] sqft | Jan. 17, 2012 304 Harper Drive [Member] sqft
--- | --- | --- | --- | ---
Significant Acquisitions and Disposals [Line Items] |  |  |  |
Net rentable space of property acquired | 154,392 |  |  |
Acquired real estate, cost of property | $ 9.1 |  |  |
Acquisition related costs | 0.1 |  |  |
Net rentable square feet of properties sold |  | 121,381 | 268,240 | 32,978
Sales price of properties sold |  | $ 29.0 | $ 91.1 | $ 3.0
Lease percentage of sold property |  | 83.70% | 100.00% | 90.10%

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