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Subsequent Events Subsequent Events (Details) (USD $)
 0 Months Ended 9 Months Ended 0 Months Ended
Apr. 10, 2013
Sep. 30, 2013
Sep. 30, 2012
Oct. 16, 2013
Austin Joint Venture [Member]
Properties
sqft
Oct. 16, 2013
Brandywine Realty Trust [Member]
Austin Joint Venture [Member]
Oct. 16, 2013
DRA Advisors LLC [Member]
Austin Joint Venture [Member]
Oct. 31, 2013
Residential Real Estate [Member]
Cira Walnut Tower [Member]
sqft
Oct. 31, 2013
Lesee Tenant 2 [Member]
Office Real Estate [Member]
Cira Walnut Tower [Member]
sqft
Subsequent Event [Line Items]                
Number of properties contributed to a joint venture       7        
Net rentable square feet       1,398,826     245,000 100,000
Equity Method Investment, Total Value Contributed         $ 330,000,000      
Net proceeds from issuance of common shares 181,700,000 181,527,000 0          
Equity Method Investment, Ownership Percentage         50.00% 50.00%    
Equity Method Investment, Additional Distribution Rights         10.00%      
Potential future capital contributions under joint ventures which are not contractually binding         100,000,000      
Proceeds from Equity Method Investment, Dividends or Distributions   3,661,000 2,779,000     271,500,000    
Non-Recourse Debt           230,600,000    
Amount Of Participant Contribution           49,700,000    
Equity Method Investments, Closing Costs           1,900,000    
Closing Proprations and Lender Holdbacks           6,900,000    
Equity method investment, agreement to pay future capital expenditures         5,200,000      
Equity Method Investment, Distribution, Net of Initial Funding Agreement           $ 266,300,000