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Subsequent Events (Details) (USD $) | 3 Months Ended |  | 0 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Apr. 03, 2014 Four Points Centre [Member] Properties Storey sqft | Apr. 03, 2014 Austin Joint Venture [Member] Four Points Centre [Member] | Apr. 03, 2014 Austin Joint Venture [Member] Brandywine Realty Trust [Member] Four Points Centre [Member] | Apr. 03, 2014 Austin Joint Venture [Member] DRA Advisors LLC [Member] Four Points Centre [Member]
Subsequent Event [Line Items] |  |  |  |  |  |
Number of Real Estate Properties |  |  | 2 |  |  |
Number of floors of a building |  |  | 3 |  |  |
Net Rentable Space |  |  | 192,396 |  |  |
Aggregate gross sales price of a joint venture |  |  |  |  | $ 41,500,000 |
Non-Recourse Debt |  |  |  | 29,000,000 |  |
Amount Of Participant Contribution |  |  |  |  |  | 5,900,000
Proceeds from Equity Method Investment, Dividends or Distributions | 2,828,000 | 1,357,000 |  |  | 34,400,000 |
Payments to Acquire Equity Method Investments |  |  |  |  | 5,900,000 |
Loss On Real Estate Venture Transactions, including real estate venture formation | $ (135,000) | $ 0 |  |  | $ (200,000) |

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- Definition This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Article 5 + Details
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