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Real Estate Assets (Details) (USD $)
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Business Acquisition, Purchase Price Allocation [Abstract]    
Amount of real estate assets acquired$ 241,602,000 $ 241,602,000 
Amount of acquisition-related intangible assets (in deferred leasing and financing costs) acquired39,721,000 39,721,000 
Amount of furniture, fixtures and equipment (in prepaid and other assets) acquired1,101,000 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 acquisition266,797,000 266,797,000 
Business Acquisition, Proforma Information [Abstract]    
Proforma rental and other revenues133,669,000129,590,000393,640,000385,400,000
Proforma net income7,568,0008,180,00032,823,00059,124,000
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 operations2,573,00002,573,000(86,000)
Gains on disposition of property262,00019,000462,00055,000
Impairments [Abstract]    
Impairment of assets held for use2,429,00002,429,0000
Number of impaired properties2 2 
Atlanta, GA Office Property Acquisition [Member]
    
Acquisitions [Abstract]    
Acquisition rentable square feet503,000   
Acquisition purchase price78,300,000 78,300,000 
Fair value of assumed debt from the acquisition67,900,000 67,900,000 
Effective interest rate of assumed secured debt from the acquisition5.45% 5.45% 
Maturity date of assumed debt from the acquisitionJan. 01, 2014 Jan. 01, 2014 
Acquisition-related costs  300,000 
Pittsburgh, PA Office Property Acquisition [Member]
    
Acquisitions [Abstract]    
Acquisition rentable square feet1,540,000   
Acquisition purchase price188,500,000 188,500,000 
Fair value of assumed debt from the acquisition124,500,000 124,500,000 
Effective interest rate of assumed secured debt from the acquisition4.27% 4.27% 
Maturity date of assumed debt from the acquisitionNov. 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 estate15,000,000   
Gain on disposition of discontinued operations2,600,000   
Gains on disposition of property$ 300,000