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Real Estate Investments (Acquisitions and Dispositions) (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2012 A | Sep. 30, 2012 TB-BDN Plymouth Apartments [Member] | Sep. 05, 2012 TB-BDN Plymouth Apartments [Member] A | Jan. 06, 2012 Plymouth Meeting, Pennsylvania [Member] sqft | Jul. 18, 2012 Oaklands Corporate Center [Member] | Jun. 22, 2012 Pacific Ridge Corporate Center [Member] sqft | Mar. 22, 2012 South Lake at Dulles Corner [Member] sqft | Jan. 17, 2012 304 Harper Drive [Member] sqft
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Significant Acquisitions and Disposals [Line Items] |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 50.00% |  |  |  |  |
Area Owned By Real Estate Venture Of Undeveloped Parcels Of Land | 24 |  | 20 |  |  |  |  |
Other Ownership Interests, Contributed Capital |  |  | $ 15.5 |  |  |  |  |
Number of Units in Real Estate Property |  |  | 398 |  |  |  |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures |  | 15.2 |  |  |  |  |  |
Permanent Basis Adjustment Between Carrying Value And Fair Value |  | 0.3 |  |  |  |  |  |
Net rentable space of property acquired |  |  |  | 154,392 |  |  |  |
Acquired real estate, cost of property |  |  |  | 9.1 |  |  |  |
Acquisition related costs |  |  |  | 0.1 |  |  |  |
Number of real estate properties sold |  |  |  |  | 11 |  |  |
Net rentable square feet of properties sold |  |  |  |  | 466,719 | 121,381 | 268,240 | 32,978
Sales price of properties sold |  |  |  |  | $ 52.7 | $ 29.0 | $ 91.1 | $ 3.0
Lease percentage of sold property |  |  |  |  | 81.60% | 83.70% | 100.00% | 90.10%

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- Definition The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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