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Real Estate Investments Acquisitions and Dispositions (Details) (USD $) | 3 Months Ended | 9 Months Ended |  | 3 Months Ended |  | 0 Months Ended | 12 Months Ended |  |  | 0 Months Ended |  | 0 Months Ended |  | 9 Months Ended |  |  |  | 0 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Sep. 30, 2014 Campus Pointe [Member] sqft | Sep. 30, 2014 Valleybrooke Office Park [Member] sqft Properties | Apr. 16, 2014 West Point II Land [Member] acre | Apr. 07, 2014 Princeton Pike Corporate Center [Member] | Feb. 25, 2014 Princeton Pike Corporate Center [Member] | Feb. 25, 2013 Princeton Pike Corporate Center [Member] Properties sqft | Apr. 03, 2014 Four Points Centre [Member] Properties Storey sqft | Mar. 27, 2014 Rob Roy - Land [Member] acre | Apr. 03, 2014 Austin Joint Venture [Member] Four Points Centre [Member] | Feb. 19, 2014 Encino Trace - Land [Member] sqft Properties acre Storey | Sep. 30, 2014 Encino Trace - Building I [Member] | Sep. 30, 2014 One and Two Commerce Square [Member] | Dec. 31, 2013 One and Two Commerce Square [Member] | Dec. 19, 2013 One and Two Commerce Square [Member] Storey | Apr. 03, 2014 DRA Advisors LLC [Member] Austin Joint Venture [Member] Four Points Centre [Member] | Apr. 03, 2014 Brandywine Realty Trust [Member] Austin Joint Venture [Member] Four Points Centre [Member]
Significant Acquisitions and Disposals [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate gross sales price of a joint venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 41,500,000
Net gain from remeasurement of investment in RE ventures | 0 | 0 | 458,000 | 7,847,000 |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 99.00% |  |
Area Owned by Company of Undeveloped Parcels Of Land |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 54.1 |  |  |  |  |  |
Total potential development capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 320,000 |  |  |  |  |  |
Number of Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Number of floors of a building |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  | 4 |  |  |  | 41 |  |
Business Acquisition, Transaction Costs |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |
Net Rentable Space |  |  |  |  |  |  |  |  |  |  |  | 192,396 |  |  |  |  |  |  |  |  |
Accounts receivable, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,100,000 | 1,600,000 |  |  |
Area of Land |  |  |  |  |  |  |  | 5.3 |  |  |  |  | 16.8 |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,000,000 |  |  |  |  |  |
Construction in Progress, Gross |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,400,000 | 28,700,000 |  |  |  |  |
Land | 675,109,000 |  | 675,109,000 |  | 680,513,000 |  |  |  |  |  |  |  |  |  | 4,600,000 |  |  |  |  |  |
Number of real estate properties sold |  |  |  |  |  |  |  |  |  |  | 8 |  |  |  |  |  |  |  |  |  |
Net Rentable Space Sold |  |  |  |  |  | 172,943 | 279,934 |  |  |  | 800,546 |  |  |  |  |  |  |  |  |  |
Escrow Deposit |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |
Sale Consideration Of Sold Property |  |  |  |  |  | 42,500,000 | 37,900,000 | 1,600,000 |  |  | 121,000,000 |  | 3,500,000 |  |  |  |  |  |  |  |
Provision for impairment on assets held for sale | 1,765,000 | 0 | 1,765,000 | 0 |  |  | 1,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net gain on disposition of real estate | 4,698,000 | 0 | 4,698,000 | 0 |  | 4,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal group, number of properties held for sale |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net gain (loss) on disposition of discontinued operations | (3,000) | (16,000) | 900,000 | 3,029,000 |  |  |  |  | 900,000 | 5,300,000 |  |  |  |  |  |  |  |  |  |  |
Number of Real Estate Properties |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Gain (Loss) on sale of undepreciated real estate | 0 | (129,000) | 1,184,000 | (129,000) |  |  |  |  |  |  |  |  | 1,200,000 |  |  |  |  |  |  |  |
Non-Recourse Debt |  |  |  |  |  |  |  |  |  |  |  |  |  | 29,000,000 |  |  |  |  |  |  |
Amount Of Participant Contribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,900,000 |
Proceeds from Equity Method Investment, Dividends or Distributions |  |  | 7,341,000 | 3,661,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 34,400,000
Equity method investment, credit to capital contribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,900,000
Net gain (loss) on real estate venture transactions | $ 0 | $ 0 | $ (417,000) | $ 3,683,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (200,000)

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- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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