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Real Estate Assets (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010
Business Acquisition, Purchase Price Allocation [Abstract] |  |  |  |
Amount of real estate assets acquired | $ 241,602,000 |  | $ 241,602,000 |
Amount of acquisition-related intangible assets (in deferred leasing and financing costs) acquired | 39,721,000 |  | 39,721,000 |
Amount of furniture, fixtures and equipment (in prepaid and other assets) acquired | 1,101,000 |  | 1,101,000 |
Amount of acquisition-related intangible liabilities (in accounts payable, accrued liabilities and other expenses) assumed | (15,627,000) |  | (15,627,000) |
Total consideration from the acquisition | 266,797,000 |  | 266,797,000 |
Business Acquisition, Proforma Information [Abstract] |  |  |  |
Proforma rental and other revenues | 133,669,000 | 129,590,000 | 393,640,000 | 385,400,000
Proforma net income | 7,568,000 | 8,180,000 | 32,823,000 | 59,124,000
Proforma earnings per share - basic | $ 0.09 | $ 0.09 | $ 0.34 | $ 0.71
Proforma earnings per share - diluted | $ 0.09 | $ 0.09 | $ 0.34 | $ 0.71
Dispositions [Abstract] |  |  |  |
Gain on disposition of discontinued operations | 2,573,000 | 0 | 2,573,000 | (86,000)
Gains on disposition of property | 262,000 | 19,000 | 462,000 | 55,000
Impairments [Abstract] |  |  |  |
Impairment of assets held for use | 2,429,000 | 0 | 2,429,000 | 0
Number of impaired properties | 2 |  | 2 |
Atlanta, GA Office Property Acquisition [Member] |  |  |  |
Acquisitions [Abstract] |  |  |  |
Acquisition rentable square feet | 503,000 |  |  |
Acquisition purchase price | 78,300,000 |  | 78,300,000 |
Fair value of assumed debt from the acquisition | 67,900,000 |  | 67,900,000 |
Effective interest rate of assumed secured debt from the acquisition | 5.45% |  | 5.45% |
Maturity date of assumed debt from the acquisition | Jan. 01, 2014 |  | Jan. 01, 2014 |
Acquisition-related costs |  |  | 300,000 |
Pittsburgh, PA Office Property Acquisition [Member] |  |  |  |
Acquisitions [Abstract] |  |  |  |
Acquisition rentable square feet | 1,540,000 |  |  |
Acquisition purchase price | 188,500,000 |  | 188,500,000 |
Fair value of assumed debt from the acquisition | 124,500,000 |  | 124,500,000 |
Effective interest rate of assumed secured debt from the acquisition | 4.27% |  | 4.27% |
Maturity date of assumed debt from the acquisition | Nov. 01, 2017 |  | Nov. 01, 2017 |
Acquisition-related costs |  |  | 4,000,000 |
Winston Salem, NC Disposition [Member] |  |  |  |
Dispositions [Abstract] |  |  |  |
Gross proceeds from the sale of real estate | 15,000,000 |  |  |
Gain on disposition of discontinued operations | 2,600,000 |  |  |
Gains on disposition of property | $ 300,000 |  |  |

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