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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
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Nov. 30, 2010 | Dec. 31, 2011 Broadmoor Austin Associates [Member] | Dec. 31, 2011 Brandywine - Al Venture [Member] | Dec. 20, 2011 Brandywine - Al Venture [Member] | Dec. 31, 2011 Macquarie BDN Christina LLC [Member] | Dec. 31, 2011 One Commerce Square [Member] | Dec. 31, 2011 Brandywine 1919 Ventures [Member] | Dec. 31, 2011 Two Commerce Square [Member] | Dec. 31, 2011 1000 Chesterbrook Blvd. [Member] | Dec. 31, 2011 Four Tower Bridge [Member] | Dec. 31, 2011 G&I Interchange Office LLC (DRA — N. PA) [Member] | Dec. 31, 2011 Residence Inn Tower Bridge [Member] | Dec. 31, 2011 PJP VII [Member] | Dec. 31, 2011 PJP V [Member] | Dec. 31, 2011 PJP II [Member] | Dec. 31, 2011 Six Tower Bridge [Member] | Dec. 31, 2011 Two Tower Bridge [Member] | Dec. 31, 2011 Seven Tower Bridge [Member] | Dec. 31, 2011 PJP VI [Member] | Dec. 31, 2011 Eight Tower Bridge [Member] | Dec. 31, 2011 Coppell Associates [Member] | Dec. 31, 2011 Five Tower Bridge [Member] | Dec. 31, 2011 Invesco, L.P. [Member]
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company's ownership percentage in the Real Estate Venture |  |  |  | 25.00% | 50.00% | [1] | 50.00% | [1],[2] | 50.00% | 20.00% | [1] | 25.00% | [1],[3] | 50.00% | [1],[4] | 25.00% | [1],[3] | 50.00% | [1] | 65.00% | [1],[5] | 20.00% | [1],[6] | 50.00% | [1] | 25.00% | [1] | 25.00% | [1] | 30.00% | [1] | 63.00% | [1],[5] | 35.00% | [1],[7] | 20.00% | [1],[8] | 25.00% | [1] | 3.40% | [1] | 50.00% | [1],[5],[9] |  |
Company's share of equity (Company's basis) | $ 115,807 | $ 84,372 |  |  | $ 66,150 |  | $ 24,670 | [2] |  | $ 6,168 |  | $ 5,100 | [3] | $ 4,882 | [4] | $ 3,415 | [3] | $ 1,745 |  | $ 1,360 | [5] | $ 1,239 | [6] | $ 481 |  | $ 472 |  | $ 361 |  | $ 300 |  | $ 201 | [5] | $ 134 | [7] | $ 105 | [8] | $ 31 |  | $ 0 |  | $ (1,007) | [5],[9] | $ 0 | $ 0
Company's share of income (Company's basis) | 3,775 | 5,305 | 4,069 |  | 197 |  | (278) | [2] |  | 875 |  | 242 | [3] | 0 | [4] | 224 | [3] | 245 |  | 702 | [5] | 76 | [6] | 433 |  | 190 |  | 116 |  | 138 |  | 126 | [5] | (364) | [7] | 0 | [8] | 67 |  | 583 |  | (139) | [5],[9] | 60 | 282
Real Estate Venture Debt at 100% | $ 745,830 |  |  |  | $ 66,810 |  | $ 68,000 | [2] |  | $ 60,000 |  | $ 128,529 | [3] | $ 0 | [4] | $ 107,112 | [3] | $ 26,000 |  | $ 10,870 | [5] | $ 181,967 | [6] | $ 14,261 |  | $ 8,072 |  | $ 5,789 |  | $ 4,263 |  | $ 12,599 | [5] | $ 13,482 | [7] | $ 11,182 | [8] | $ 8,834 |  | $ 0 |  | $ 18,060 | [5],[9] |  |
Debt Instrument Interest Rates Effective Percentage | LIBOR plus 0.725 | LIBOR plus 0.725 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | L+1.55% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current Interest Rate |  |  |  |  | 7.04% |  |  |  |  | 4.50% |  | 5.67% | [3] |  |  | 6.30% | [3] | 4.75% |  | 5.20% | [5] | 5.78% | [6] | 5.63% |  |  |  | 6.47% |  | 6.12% |  | 7.79% | [5] |  |  |  |  | 6.08% |  |  |  |  |  |  |
[1] | Ownership percentage represents the Company’s entitlement to residual distributions after payments of priority returns, where applicable.
[2] | See Note 3 for related discussion about the Brandywine-AI Venture, LLC formation.
[3] |
[4] | See Note 3 for related discussion about the Brandywine 1919 Market Ventures formation.
[5] | As a result of the adoption of the new accounting standard for the consolidation of variable interest entities, the Company deconsolidated these three real estate ventures as of January 1, 2010.
[6] | Proceeds received by the Company from the sale of an 80% ownership stake in the properties exceeded the historical cost of those properties. Accordingly, no investment in the real estate venture was reflected on the balance sheet at period end.
[7] | Consists of a $10.1 million fixed rate mortgage with a 5.72% interest rate and May 2013 maturity date; also includes $3.4 million municipal and state borrowings with nominal interest rates (0 — 1%) and maturity dates from 3 to 10 years.
[8] | Comprised of two fixed rate mortgages: $7.0 million and $1.0 million. Both mature in February 2013 and accrue interest at a fixed rate of 4% through February 2012, and 5% through February 2013. The total loan amount of $11.2 million as presented above also includes a 3% fixed rate loan (interest only through maturity) with a balance of $1.2 million as of December 31, 2011. This loan can be increased up to $1.3 million through its maturity date of September 2025. The remaining $2.0 million of the total amount features a 4% fixed rate with interest only through its maturity date of February 2014.
[9] | Comprised of two fixed rate mortgages: a senior fixed rate note of $16.4 million at 5.75% that matures in March 2016 and a junior fixed rate note of $1.6 million at 6.89% that matures in December 2013; 5.89% is the blended rate.

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