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Investment in Unconsolidated Ventures Company's Investment in Real Estate Ventures and the Company's Share of the Real Estate Ventures' Income (Loss) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
A
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Broadmoor Austin Associates [Member]
Rate
Dec. 31, 2012
Brandywine - Al Venture [Member]
Rate
Dec. 31, 2011
Brandywine - Al Venture [Member]
Dec. 20, 2011
Brandywine - Al Venture [Member]
Dec. 31, 2012
BDN Beacon Venture LLC [Member]
Rate
Dec. 31, 2012
TB-BDN Plymouth Apartments [Member]
Rate
A
Dec. 31, 2012
Six Tower Bridge [Member]
Rate
Dec. 31, 2012
One Commerce Square [Member]
Rate
Dec. 31, 2012
Two Commerce Square [Member]
Rate
Dec. 31, 2012
Brandywine Nineteen Nineteen Ventures [Member]
Rate
Dec. 31, 2012
One Thousand Chesterbrook Blvd. [Member]
Rate
Dec. 31, 2012
Four Tower Bridge [Member]
Rate
Dec. 31, 2012
Residence Inn Tower Bridge [Member]
Rate
Dec. 31, 2012
PJP VII [Member]
Rate
Dec. 31, 2012
PJP Two [Member]
Rate
Dec. 31, 2012
G&I Interchange Office LLC (DRA — N. PA) [Member]
Rate
Dec. 31, 2012
Seven Tower Bridge [Member]
Rate
Dec. 31, 2012
PJP Five [Member]
Rate
Dec. 31, 2012
Two Tower Bridge [Member]
Rate
Dec. 31, 2012
PJP Six [Member]
Rate
Dec. 31, 2012
Coppell Associates [Member]
Rate
Dec. 31, 2012
Eight Tower Bridge [Member]
Dec. 31, 2012
Invesco, L.P. [Member]
Dec. 31, 2012
Mortgage Maturing May 2013 [Member]
Two Tower Bridge [Member]
Dec. 31, 2012
Partner Loan [Member]
Six Tower Bridge [Member]
Dec. 31, 2012
Priority Loan [Member]
Six Tower Bridge [Member]
Dec. 31, 2012
Senior Mortgage [Member]
Coppell Associates [Member]
Dec. 31, 2012
Secured Debt [Member]
Mortgage Maturing February 2015 [Domain]
Seven Tower Bridge [Member]
Fixed_Rate_Mortgages
Dec. 31, 2012
Secured Debt [Member]
Fixed Rate Loan Maturing September 2025 [Member]
Seven Tower Bridge [Member]
Dec. 31, 2012
Secured Debt [Member]
Fixed Rate Loan Maturing February 2014 [Member]
Seven Tower Bridge [Member]
Dec. 31, 2012
Municipal and state borrowings [Member]
Two Tower Bridge [Member]
Dec. 31, 2012
Junior Mortgage [Member]
Coppell Associates [Member]
Dec. 31, 2012
Newtown Square/Berwyn Park/Libertyview [Member]
Secured Debt [Member]
Schedule of Equity Method Investments [Line Items]                                                                        
Area Owned By Real Estate Venture Of Undeveloped Parcels Of Land 24               20 [1]                                                      
Ownership Percentage Footnote Ownership Percentage (a) [2]                                                                      
Equity Method Investment, Ownership Percentage       50.00% 50.00%   50.00% 20.00% 50.00% [1] 63.00% [3] 25.00% 25.00% [4] 50.00% 50.00% 65.00% 50.00% 25.00% 30.00% 20.00% [5] 20.00% 25.00% 35.00% 25.00% 50.00%                        
Real estate venture mortgage repayment                   $ 12,200                                                    
Equity Method Investments 193,555 115,807   65,919 49,169 24,700   17,294 15,222 13,330 13,056 9,171 5,632 1,981 1,297 716 593 417 260 242 192 113 42 (1,091) 0 0                    
Income (Loss) from Equity Method Investments 2,741 3,775 5,305 (231) (648)     1,546 0 (135) 657 455 0 455 400 434 221 117 (626) 0 (81) (21) 12 (84) 12 258                    
Equity Method Investment Summarized Financial Information Debt $ 724,780     $ 60,656 $ 134,500     $ 0 $ 0 $ 0 $ 126,869 $ 106,612 $ 0 $ 25,444 $ 10,707 $ 13,990 $ 6,678 $ 4,022 $ 179,671 $ 11,107 $ 5,619 $ 13,213 $ 8,626 $ 17,066     $ 9,900 [6] $ 8,400 [3]   $ 16,200 [7] $ 8,000 $ 1,100 [8] $ 2,000 [8] $ 3,300 [6] $ 900 [7]  
Debt Instrument, Interest Rate During Period, Footnote                                       (g) [8]   (h) [6]   (i) [7]                        
Debt Instrument, Interest Rate During Period       7.04% 3.87%           5.67% 6.30%   4.75% 5.20% 5.63%   6.12% 5.78%   6.47%   6.08%                          
Debt Instrument Interest Rates Effective Percentage                               L+1.55%                                        
Debt Instrument Maturity Dates       Apr-23 (b) [9]           Dec-15 May-13   Dec-21 Feb-21 Feb-16 Nov-13 Nov-23 Jan-15 (g) [8] Aug-19 (h) [6] Apr-23 (i) [7]                       May-13
Sale of ownership in properties                                     80.00%                                  
Debt Instrument, Number of Fixed Rate Mortgages                                                             2 [8]          
Debt Instrument, Interest Rate, Stated Percentage                                                     5.72% [6] 9.00% [3] 9.00% [3] 5.75% [7] 5.00% [8] 3.00% [8] 4.00% [8]   6.89% [7]  
Debt Instrument, Interest Rate Increase                                                             0.01 [8]          
Debt Instrument, Blended Rate                                                                     5.81% [7]  
[1] (c)On September 5, 2012, the Company contributed a 20-acre parcel of land into a newly formed real estate venture and retained a 50% ownership interest. The land parcel contributed to the Venture was deconsolidated by the Company from land inventory.
[2] (a)Ownership percentage represents the Company's entitlement to residual distributions after payments of priority returns, where applicable.
[3] (d)On November 1, 2012, Six Tower Bridge Associates paid off its $12.2 million loan using funds contributed by the Company in the form of a $8.4 million partner loan which pays current interest expense at 9.0%, and a $4.9 million priority loan which accrues interest at 9.0%, compounding annually (the additional funds contributed from the partner and priority loans were used for operations of the venture).
[4] (e)In accordance with the accounting guidance for joint ventures, the Company is currently recognizing its preferred return from the real estate ventures as income on its invested capital. After the other partner has recognized the losses equal to its invested capital, the Company will begin to recognize its share from the results of operations of the real estate ventures in proportion to its 25% ownership interests.
[5] (f)Proceeds received by the Company from the sale of an 80% ownership stake in the properties exceeded the historical cost of those properties. No investment in the real estate venture was reflected on the balance sheet at formation, and the current balance reflects interim capital contributions.
[6] (h)Consists of a $9.9 million fixed rate mortgage with a 5.72% interest rate and May 2013 maturity date and $3.3 million municipal and state borrowings with nominal interest rates (0 — 1%) and maturity dates from 1 to 5 years
[7] (i)Comprised of a senior fixed rate note of $16.2 million at 5.75% that matures in March 2016 and a junior fixed rate note of $0.9 million at 6.89% that matures in December 2013; 5.81% is the blended rate.
[8] (g)Comprised of two fixed rate mortgages totaling $8.0 million that mature in February 2015 and accrue interest at a current rate of 5% (increasing by 1% annually through maturity), a $1.1 million 3% fixed rate loan with interest only through its September 2025 maturity, and a $2.0 million 4% fixed rate loan with interest only through its February 2014 maturity.
[9] (b)See Note 3 for related discussion about the Brandywine-AI Venture, LLC formation.