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Description of Business and Significant Accounting Policies (Details) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2011 | Jun. 30, 2010 | Jun. 30, 2011 | Jun. 30, 2010 | Dec. 31, 2010
Description of Business and Significant Accounting Policies [Abstract] |  |  |  |  |
In-service office, industrial and retail properties (in units) | 296 |  | 296 |  |
Square footage of commercial property (in sq feet) | 27,300,000 |  | 27,300,000 |  |
Rental residential units (in units) | 96 |  | 96 |  |
Residential condominiums for sale (in units) | 19 |  | 19 |  |
Undeveloped land suitable for future development (in acres) | 603 |  | 603 |  |
Undeveloped land considered core holdings (in acres) | 523 |  | 523 |  |
Percentage of ownership of Common Units | 95.00% |  | 95.00% |  |
Common Units of partnership owned by The Company | 72,000,000 |  | 72,000,000 |  |
Common Units of partnership not owned by the Company | 3,800,000 |  | 3,800,000 |  |
Common Stock par value | $ 0.01 |  | $ 0.01 |  | $ 0.01
Number of officers of the Company who are also limited partners | 1 |  | 1 |  |
Number of directors of the Company who are also limited partners | 2 |  | 2 |  |
Common units redeemed for a like number of common shares of stock (in shares) |  |  | 18,737 |  |
Number of trading days preceeding Redemption Notice Date | 10 |  | 10 |  |
Maximum Aggregate Offering Price of Common Stock Issuances |  |  | $ 150,000,000 |  |
Number of Common Stock Sold During Period (in shares) | 236,000 |  |  |  |
Average Price of Common Stock Sold During Period | $ 35.62 |  |  |  |
Net Proceeds of Common Stock Sold During Period | 8,300,000 |  |  |  |
Number of Preferred Stock Redeemed During Period (in shares) | 2,100,000 |  |  |  |
Redemption Price of Preferred Stock Redeemed During Period | 52,500,000 |  |  |  |
Excess of Preferred Stock redemption/repurchase cost over carrying value | $ 1,895,000 | $ 0 | $ 1,895,000 | $ 0 |
Number of common units required to convert to one share of common stock (in shares) | 1 |  | 1 |  |

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- Definition The maximum aggregate offering price of Common Stock issuances "at the market" during the period. + Details
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- Definition The number of directors who are also limited partners of the Operating Partnership + Details
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- Definition Face amount or stated value of common stock per share; generally not indicative of the fair market value per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 -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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The excess of (1) fair value of the consideration transferred to the holders of the preferred stock over (2) the carrying amount of the preferred stock in the registrant's balance sheet, during the accounting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number D-42 -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section S99 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6802175&loc=d3e42851-122695 + Details
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