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Investment in Unconsolidated Ventures (Narrative) (Details) (USD $) | 12 Months Ended |
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Dec. 31, 2011 A Room sqft Real_Estate_Investments Real_Estate_Ventures Buildings | Nov. 30, 2010 Buildings
Investment in Unconsolidated Ventures (Textuals) [Abstract] |  |  |
Number of unconsolidated Real Estate Ventures | 18 |  |
Number of real estate ventures that owns 52 office buildings | 15 |  |
Number of office buildings owned by 15 Real Estate Ventures | 52 |  |
Net rentable square feet of 52 office buildings owned the 15 Real Estate Ventures | 6,700,000 |  |
Number of real estate ventures that owns undeveloped land | 2 |  |
Area of undeveloped parcels of land (in acres) owned by a Real Estate Venture | 4 |  |
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% |  |
Company's ownership percentage in the Real Estate Venture |  |  | 25.00%
Percentage of interest acquired in partnerships by other partner |  |  | 75.00%
Interest acquired in partnerships, Number |  |  | 2
Number of office buildings owned |  |  | 2
Real estate venture debt | $ 745,830,000 |  |
G&I Interchange Office LLC (DRA — N. PA) [Member] |  |  |
Investment in Unconsolidated Ventures (Textuals) [Abstract] |  |  |
Company's ownership percentage in the Real Estate Venture | 20.00% | [1],[2] |
Sale of ownership in properties | 80.00% |  |
Real estate venture debt | 181,967,000 | [2] |
Two Tower Bridge [Member] |  |  |
Investment in Unconsolidated Ventures (Textuals) [Abstract] |  |  |
Company's ownership percentage in the Real Estate Venture | 35.00% | [1],[3] |
Real estate venture debt | 13,482,000 | [3] |
Two Tower Bridge [Member] | Mortgage Maturing May 2013 [Member] |  |  |
Investment in Unconsolidated Ventures (Textuals) [Abstract] |  |  |
Debt instrument stated interest rate | 5.72% |  |
Real estate venture debt | 10,100,000 |  |
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Minimum | 0.00% |  |
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Maximum | 1.00% |  |
Two Tower Bridge [Member] | Mortgage Maturing May 2013 [Member] | Minimum [Member] |  |  |
Investment in Unconsolidated Ventures (Textuals) [Abstract] |  |  |
Debt Instrument, Term | 3 years |  |
Two Tower Bridge [Member] | Mortgage Maturing May 2013 [Member] | Maximum [Member] |  |  |
Investment in Unconsolidated Ventures (Textuals) [Abstract] |  |  |
Debt Instrument, Term | 10 years |  |
Two Tower Bridge [Member] | Municipal and state borrowings [Member] |  |  |
Investment in Unconsolidated Ventures (Textuals) [Abstract] |  |  |
Real estate venture debt | 3,400,000 |  |
Seven Tower Bridge [Member] |  |  |
Investment in Unconsolidated Ventures (Textuals) [Abstract] |  |  |
Company's ownership percentage in the Real Estate Venture | 20.00% | [1],[4] |
Debt instrument stated interest rate | 3.00% |  |
Real estate venture debt | 11,182,000 | [4] |
Debt Instrument, Number of Fixed Rate Mortgages | 2 |  |
Seven Tower Bridge [Member] | Mortgage One and Two [Member] | Fixed Interest Rate Through February 2012 [Member] |  |  |
Investment in Unconsolidated Ventures (Textuals) [Abstract] |  |  |
Debt instrument stated interest rate | 4.00% |  |
Seven Tower Bridge [Member] | Mortgage One and Two [Member] | Fixed Interest Rate Through February 2013 [Member] |  |  |
Investment in Unconsolidated Ventures (Textuals) [Abstract] |  |  |
Debt instrument stated interest rate | 5.00% |  |
Seven Tower Bridge [Member] | Mortgage Maturing February 2014 [Member] |  |  |
Investment in Unconsolidated Ventures (Textuals) [Abstract] |  |  |
Debt instrument stated interest rate | 4.00% |  |
Seven Tower Bridge [Member] | Secured Debt [Member] | Mortgage One Maturing February 2013 [Member] |  |  |
Investment in Unconsolidated Ventures (Textuals) [Abstract] |  |  |
Real estate venture debt | 7,000,000 |  |
Seven Tower Bridge [Member] | Secured Debt [Member] | Mortgage Two Maturing February 2013 [Member] |  |  |
Investment in Unconsolidated Ventures (Textuals) [Abstract] |  |  |
Real estate venture debt | 1,000,000 |  |
Seven Tower Bridge [Member] | Secured Debt [Member] | Mortgage Maturing February 2014 [Member] |  |  |
Investment in Unconsolidated Ventures (Textuals) [Abstract] |  |  |
Real estate venture debt | 2,000,000 |  |
Seven Tower Bridge [Member] | Line of Credit [Member] |  |  |
Investment in Unconsolidated Ventures (Textuals) [Abstract] |  |  |
Real estate venture debt | 1,200,000 |  |
Equity Method Investment Summarized Financial Information Debt, Maximum Borrowings | 1,300,000 |  |
Coppell Associates [Member] |  |  |
Investment in Unconsolidated Ventures (Textuals) [Abstract] |  |  |
Company's ownership percentage in the Real Estate Venture | 50.00% | [1],[5],[6] |
Real estate venture debt | 18,060,000 | [5],[6] |
Debt Instrument, Number of Fixed Rate Mortgages | 2 |  |
Debt Instrument, Blended Rate | 5.89% |  |
Coppell Associates [Member] | Senior Mortgage [Member] |  |  |
Investment in Unconsolidated Ventures (Textuals) [Abstract] |  |  |
Debt instrument stated interest rate | 5.75% |  |
Real estate venture debt | 16,400,000 |  |
Coppell Associates [Member] | Junior Mortgage [Member] |  |  |
Investment in Unconsolidated Ventures (Textuals) [Abstract] |  |  |
Debt instrument stated interest rate | 6.89% |  |
Real estate venture debt | $ 1,600,000 |  |
[1] | Ownership percentage represents the Company’s entitlement to residual distributions after payments of priority returns, where applicable.
[2] | 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.
[3] | 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.
[4] | 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.
[5] | 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.
[6] | 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.

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