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Investment in Unconsolidated Ventures (Details Textuals 1) (USD $) In Millions, unless otherwise specified | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2011 sqft | Dec. 31, 2012 | Jul. 29, 2011 sqft | Nov. 30, 2010
Investment in Unconsolidated Ventures (Textuals) [Abstract] |  |  |  |
Number of unconsolidated Real Estate Ventures | 16 |  |  |
Number of office buildings owned by 14 Real Estate Ventures | 49 |  |  |
Number of real estate ventures that owns 49 office buildings | 14 |  |  |
Net rentable square feet of 49 office buildings owned the 14 Real Estate Ventures | 6,100,000 |  |  |
Number of rooms in a hotel property developed by one Real Estate Venture | 137 |  |  |
Minimum ownership interest in unconsolidated Real Estate Ventures | 10.00% |  |  |
Maximum ownership interest in unconsolidated Real Estate Ventures | 65.00% |  |  |
Percentage of interest acquired in partnerships |  |  |  | 25.00%
Interest acquired in partnerships, Number |  |  |  | 2
Number of office buildings owned |  |  |  | 2
Percentage of interest acquired in partnerships by other partner |  |  |  | 75.00%
Initial contribution for acquisition of partnerships |  |  |  | $ 5.0
Contribution for acquisition of partnerships |  |  |  | 25.0
Remaining portion of contribution |  | 20.0 |  |
Company's ownership percentage in the Real Estate Venture |  |  | 3.00% |
Net rentable square feet of properties sold |  |  | 347,620 |
Sales price of properties sold |  |  | 86.7 |
Gain on sale of ownership interest | $ 2.8 |  |  |
Property occupied as of date of sale | 87.00% |  |  |

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 18 -Subparagraph f Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 20 -Subparagraph a (1) + Details
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