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 9 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
sqft
Sep. 30, 2012
Sep. 30, 2013
sqft
Sep. 30, 2012
Dec. 31, 2012
sqft
Sep. 30, 2013
Medical Office Porfolio [Member]
agreements
Sep. 30, 2013
Office Building [Member]
1700 Research Boulevard [Member]
Sep. 30, 2012
Office Building [Member]
1700 Research Boulevard [Member]
Sep. 30, 2013
Office Building [Member]
1700 Research Boulevard [Member]
Sep. 30, 2012
Office Building [Member]
1700 Research Boulevard [Member]
Sep. 30, 2013
Office Building [Member]
Atrium Building [Member]
Sep. 30, 2012
Office Building [Member]
Atrium Building [Member]
Sep. 30, 2013
Office Building [Member]
Atrium Building [Member]
Sep. 30, 2012
Office Building [Member]
Atrium Building [Member]
Dec. 31, 2012
Office [Member]
1700 Research Boulevard [Member]
sqft
Sep. 30, 2013
Office [Member]
Atrium Building [Member]
sqft
Sep. 30, 2013
Office [Member]
Medical Office Porfolio [Member]
buildings
Sep. 30, 2013
Medical Office / Office
Medical Office Porfolio [Member]
sqft
Sep. 30, 2012
Medical Office / Office
Medical Office Porfolio [Member]
Sep. 30, 2013
Medical Office / Office
Medical Office Porfolio [Member]
sqft
Sep. 30, 2012
Medical Office / Office
Medical Office Porfolio [Member]
Sep. 30, 2013
Medical Office
Plumtree Medical Center [Member]
Sep. 30, 2012
Medical Office
Plumtree Medical Center [Member]
Sep. 30, 2013
Medical Office
Plumtree Medical Center [Member]
Sep. 30, 2012
Medical Office
Plumtree Medical Center [Member]
Dec. 31, 2012
Medical Office
Plumtree Medical Center [Member]
sqft
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                                    
Number of Purchase and Sale Agreements           4                                        
Number of Buildings Sold                                 2                  
Rentable square feet 1,599,000   1,599,000   134,000                   101,000 79,000   1,520,000 [1]   1,520,000 [1]           33,000
Contract sale price $ 516,500   $ 516,500   $ 23,000                   $ 14,250 $ 15,750   $ 500,750 [1]   $ 500,750 [1]           $ 8,750
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]                                                    
Revenues 12,073 13,725 37,141 41,338                                            
Property expenses (4,398) (4,793) (12,856) (13,992)                                            
Depreciation and amortization (3,215) (4,536) (12,161) (14,210)                                            
Interest expense (329) (1,163) (985) (3,494)                                            
Income from operations of properties sold or held for sale $ 4,131 $ 3,233 $ 11,139 $ 9,642     $ 0 $ 106 $ 0 $ 225 $ 0 $ 320 $ 185 $ 833       $ 4,131 $ 2,719 $ 10,954 $ 8,467 $ 0 $ 88 $ 0 $ 117  
[1] The Medical Office Portfolio consists of every property in our medical office segment (including land held for development at 4661 Kenmore Avenue) and two office buildings (6565 Arlington Boulevard and Woodholme Center).