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Investment in Unconsolidated Ventures (Narrative) (Details) (USD $)
 12 Months Ended 12 Months Ended 0 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended
Dec. 31, 2013
Room
sqft
Real_Estate_Ventures
Buildings
acre
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
BDN Beacon Venture LLC [Member]
Mar. 26, 2013
BDN Beacon Venture LLC [Member]
Dec. 31, 2013
Austin Joint Venture [Member]
Dec. 31, 2013
Two Tower Bridge [Member]
Jun. 19, 2013
Two Tower Bridge [Member]
Jul. 31, 2013
4040 Wilson Venture [Member]
acre
Dec. 31, 2013
4040 Wilson Venture [Member]
Oct. 16, 2013
4040 Wilson Venture [Member]
sqft
Jun. 19, 2013
Six Tower Bridge [Member]
Dec. 31, 2013
Six Tower Bridge [Member]
Dec. 31, 2013
The Grove at Cira Centre South [Member]
Jan. 25, 2013
The Grove at Cira Centre South [Member]
Storey
acre
beds
Dec. 31, 2013
TB-BDN Plymouth Apartments [Member]
Dec. 31, 2013
PJP VII [Member]
Dec. 31, 2013
The Grove at Cira Centre South [Member]
Jul. 31, 2013
Ashton Park [Member]
4040 Wilson Venture [Member]
Dec. 31, 2013
Brandywine Realty Trust [Member]
Austin Joint Venture [Member]
Oct. 16, 2013
Brandywine Realty Trust [Member]
Austin Joint Venture [Member]
Properties
sqft
Jul. 31, 2013
Brandywine Realty Trust [Member]
4040 Wilson Venture [Member]
Dec. 31, 2013
Brandywine Realty Trust [Member]
4040 Wilson Venture [Member]
Oct. 16, 2013
Brandywine Realty Trust [Member]
4040 Wilson Venture [Member]
Oct. 16, 2013
DRA Advisors LLC [Member]
Austin Joint Venture [Member]
Jan. 25, 2013
Campus Crest Properties, LLC [Member]
The Grove at Cira Centre South [Member]
Jan. 25, 2013
HSRE, LLC [Member] [Member]
The Grove at Cira Centre South [Member]
Schedule of Equity Method Investments [Line Items]                                                      
Number of properties contributed to a joint venture                                         7            
Area of Real Estate Property                     426,900                   1,398,826            
Aggregate gross sales price of a joint venture                                         $ 330,000,000            
Equity method investment, agreement to pay future capital expenditures                                         5,200,000     800,000      
Equity Method Investment, Distribution, Net of Initial Funding Agreement                                                 266,300,000    
Potential future capital contributions under joint ventures which are not contractually binding                                         100,000,000            
Net gain (loss) on real estate venture transactions 29,604,000 (950,000) (222,000)                                 25,900,000              
Amount Of Participant Contribution                                                 49,700,000    
Equity method investments, Closing costs                                                 1,900,000    
Closing Prorations and Lender Holdbacks                                                 6,900,000    
Proceeds from Equity Method Investment, Dividends or Distributions 7,496,000 5,109,000 10,316,000                                           271,500,000    
Number of floors of a building                             33                        
Student housing bed capacity                             850                        
Equity Method Investment, Ownership Percentage       20.00% 20.00% 50.00% 35.00% [1]   50.00% 50.00%     63.00% [2]               50.00%       50.00% 30.00% 40.00%
Equity Method Investment, Additional Distribution Rights                                         10.00%            
Non-Recourse Debt                                                 230,600,000    
Equity Method Investment, Budgeted Total Project Cost                 194,100,000         158,500,000                          
Payments to Acquire Equity Method Investments 33,069,000 65,354,000 5,277,000           72,000,000         60,700,000                          
Payments to Acquire Interest in Joint Venture                                           36,000,000 13,500,000        
Construction Loan                 125,100,000         97,800,000                          
Equity Method Investment, Aggregate Cost                             4,000,000                        
Company's share of equity (Company's basis) 180,512,000 193,555,000 115,807,000 0 17,000,000 17,262,000 0 (100,000)   13,499,000     0                            
Net gain on real estate venture transactions 3,683,000 0 0       3,683,000                                        
Number of unconsolidated Real Estate Ventures 17                                                    
Number of real estate ventures that owns 51 office buildings 11                                                    
Number of office buildings owned by 15 Real Estate Ventures 55                                                    
Net rentable square feet of 51 office buildings owned the 15 Real Estate Ventures 5,700,000                                                    
Number of real estate ventures that owns undeveloped land 2                                                    
Area of undeveloped parcels of land (in acres) owned by a Real Estate Venture 3.8               1.3           1                        
Number of real estate ventures that owns land under development 3                                                    
Area Owned By Real Estate Venture in Parcels Of Land Under Development 22.5                                                    
Fair value of land, net of amount encumbered                                     36,000,000                
Equity Method Investment, Underlying Equity in Net Assets                             8,500,000                        
Number of real estate ventures developed hotel property 1                                                    
Number of rooms in a hotel property developed by one Real Estate Venture 137                                                    
Minimum ownership interest in unconsolidated Real Estate Ventures 20.00%                                                    
Maximum ownership interest in unconsolidated Real Estate Ventures 65.00%                                                    
Net gain from remeasurement of investments in real estate ventures 6,866,000 0 0                   7,800,000                            
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value                       24,500,000                              
Business Acquisition Purchase Price Allocation Building                       14,800,000                              
Business Acquisition Purchase Price Allocation, Land Portion                       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                                      
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity                             4,500,000                        
Guarantor Obligations, Current Carrying Value                               $ 3,200,000 $ 500,000 $ 24,700,000                  
[1] (i)The ownership interest in these properties was disposed of prior to December 31, 2013. For further information on BDN Beacon LLC, see the section entitled BDN Beacon Venture below. For further information on Two Tower Bridge, see the section entitled Two and Six Tower Bridge Exchange Transaction below.
[2] (g)On June 19, 2013, we acquired ownership of Six Tower Bridge. Real estate venture income reflects our previous partnership interest for the year to date period through June 18, 2013.