Quarterly report pursuant to Section 13 or 15(d)

Real Estate - Discontinued Operations (Details)

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Real Estate - Discontinued Operations (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
sqft
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Rentable square feet     134,000
Contract sale price     $ 23,000
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]      
Revenues 347 1,285  
Property expenses (162) (462)  
Depreciation and amortization 0 (412)  
Interest expense 0 (64)  
Income from operations of properties sold or held for sale 185 347  
1700 Research Boulevard [Member]
     
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Property type Office Office  
Rentable square feet     101,000
Contract sale price     14,250
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]      
Income from operations of properties sold or held for sale 0 44  
Atrium Building [Member]
     
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Property type Office    
Rentable square feet 79,000    
Contract sale price 15,750    
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]      
Income from operations of properties sold or held for sale 185 289  
Plumtree Medical Center [Member]
     
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Property type Medical Office Medical Office  
Rentable square feet     33,000
Contract sale price     8,750
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]      
Income from operations of properties sold or held for sale $ 0 $ 14