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Investment in Unconsolidated Ventures Investment in Unconsolidated Ventures (Narrative) (Details) (USD $)
 3 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 0 Months Ended
Sep. 30, 2013
acre
Real_Estate_Ventures
Buildings
Room
sqft
Sep. 30, 2012
Sep. 30, 2013
acre
Real_Estate_Ventures
Buildings
Room
sqft
Sep. 30, 2012
Dec. 31, 2012
Jul. 31, 2013
4040 Wilson Venture [Member]
acre
Storey
Jun. 19, 2013
Two Tower Bridge [Member]
Sep. 30, 2013
The Grove at Cira Centre South [Member]
Jan. 25, 2013
The Grove at Cira Centre South [Member]
Storey
beds
acre
Jun. 19, 2013
Six Tower Bridge [Member]
Sep. 30, 2013
Six Tower Bridge [Member]
Mar. 26, 2013
BDN Beacon Venture LLC [Member]
Jan. 25, 2013
HSRE, LLC [Member] [Member]
The Grove at Cira Centre South [Member]
Jul. 31, 2013
Ashton Park [Member]
4040 Wilson Venture [Member]
Jul. 31, 2013
Brandywine Realty Trust [Member]
4040 Wilson Venture [Member]
Jan. 25, 2013
Campus Crest Properties, LLC [Member]
The Grove at Cira Centre South [Member]
Schedule of Equity Method Investments [Line Items]                                
Gain from remeasurement of investment in a real estate venture $ 0 $ 0 $ 7,847,000 $ 0             $ 7,800,000          
Number of floors of a building           20     33              
Student housing bed capacity                 850              
Company's share of equity (Company's Basis) 194,572,000   194,572,000   193,555,000   (100,000)         17,000,000        
Net gain on real estate venture transactions 0 0 3,683,000 0                        
Number of unconsolidated investments in Real Estate Ventures 18   18                          
Number of real estate ventures that owns buildings 12   12                          
Number of office buildings in Real Estate Ventures 50   50                          
Aggregate Approximate Area Of Office Buildings 6,200,000   6,200,000                          
Number of real estate ventures that owns undeveloped land 4   4                          
Area Owned By Real Estate Venture Of Undeveloped Parcels Of Land 25.3   25.3     1.3     1              
Fair value of land, net of amount encumbered                           36,000,000    
Equity Method Investment, Underlying Equity in Net Assets                 8,500,000              
Equity Method Investment, Budgeted Total Project Cost           194,300,000   158,500,000                
Payments to Acquire Equity Method Investments     30,142,000 49,763,000   72,000,000   60,700,000                
Payments to Acquire Interest in Joint Venture                             36,000,000  
Construction Loan           122,300,000   97,800,000                
Equity Method Investment, Aggregate Cost                 6,000,000              
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity                 2,500,000              
Number of real estate ventures that owns land under development 1   1                          
Area Owned By Real Estate Venture in Parcels Of Land Under Development 1.0   1.0                          
Number of real estate ventures developed hotel property 1   1                          
Number Of Rooms Contain In One Real Estate Venture Developed As Hotel Property 137   137                          
Minimum Percentage Of Unconsolidated Equity Method Investment Ownership     20.00%                          
Maximum Percentage Of Unconsolidated Equity Method Investment Ownership     65.00%                          
Guarantor Obligations, Current Carrying Value 600,000   600,000                          
Guarantor Obligations, Maximum Exposure, Undiscounted               23,000,000                
Equity Method Investment, Ownership Percentage           50.00%           20.00% 40.00%     30.00%
Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net                   24,500,000            
Business Acquisition Purchase Price Allocation Building                   14,800,000            
Business Acquisition Purchase Price Allocation, Land                   6,900,000            
Business Acquisition Purchase Price Allocation Intangible Assets                   3,300,000            
Business Acquisition Purchase Price Allocated To Market Lease Liabilities                   500,000            
Investments, Fair Value Disclosure             $ 3,600,000