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Real Estate Investments (Brandy-Al Venture) (Details) (USD $) | 12 Months Ended |  |  |  | 0 Months Ended | 12 Months Ended |  | 0 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Aug. 12, 2011 sqft | Mar. 31, 2011 | Nov. 30, 2010 | Dec. 20, 2011 Brandywine - Al Venture [Member] Years Properties | Dec. 31, 2011 Brandywine - Al Venture [Member] Properties sqft | Dec. 20, 2011 Brandywine - Al Venture [Member] Current Creek [Member] | Dec. 20, 2011 Brandywine - Al Venture [Member] Mortgages [Member]
Joint venture |  |  |  |  |  |  |  |  |  |  |
Company's ownership percentage in the Real Estate Venture |  |  |  |  |  | 25.00% | 50.00% | 50.00% | [1],[2] | 50.00% |
Total mortgage indebtedness | $ 511,061,000 | $ 711,789,000 |  |  |  |  |  | $ 22,000,000 |  |  |
Number of office buildings in Real Estate Venture |  |  |  |  | 3 |  | 3 | 2 |  |  |
Net rentable space |  |  |  | 192,707 |  |  |  | 587,317 |  |  |
Amount contributed (net of closing costs and customary propations) to the capital of the Venture |  |  |  |  |  |  | 32,200,000 |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  | 90,000,000
Debt intstrument weighted average debt securities, years |  |  |  |  |  |  | 7.4 |  |  |  |
Weighted average interest rate of debt |  |  |  |  |  |  |  |  |  |  | 4.40%
Payments from Joint Venture to acquire properties | 40,674,000 | 50,681,000 | 0 |  |  |  | 156,000,000 |  |  |  |
Sales of properties, net |  |  |  |  |  |  | 120,100,000 |  |  |  |
Transaction and joint Venture costs |  |  |  |  |  |  | 2,900,000 |  |  |  |
Sourcing additional acquisitions over investment period | 3 years |  |  |  |  |  |  |  |  |  |
Net loss on partial sale of properties | (2,791,000) | 0 | 3,000 |  |  |  |  | 100,000 |  |  |
Basis adjustment in equity method investment |  |  |  |  |  |  |  | 100,000 |  |  |
Company's share of equity (Company's basis) | 115,807,000 | 84,372,000 |  |  |  |  |  | 24,670,000 | [2] |  |
Proceeds from financing obligation |  |  |  |  |  |  |  | 7,500,000 |  |  |
Balance of the financing obligation | $ 45,528,000 | $ 36,515,000 |  |  |  |  |  | $ 7,500,000 |  |  |
[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.

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- Definition The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Chapter V -Section 563c.102 -Paragraph 13 -Subparagraph g -Subsection II -LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 14 -Subparagraph d -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14(d)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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