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Description of Business and Significant Accounting Policies (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2012 executives D property sqft acre properties | Dec. 31, 2011
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
In-service office, industrial and retail properties (in units) | 303 |
Square footage of commercial property (in sq feet) | 29,296,000 |
Residential condominiums for sale (in units) | 14 |
Undeveloped land suitable for future development (in acres) | 581 |
Undeveloped land considered core holdings (in acres) | 518 |
Office properties planned for development (in units) | 1 |
Office properties completed but not yet stabilized (in units) | 1 |
Common Units of partnership owned (in shares) | 73,200,000 |
Percentage of ownership of Common Units | 95.20% | 95.10%
Number of officers of the Company who are also limited partners | 1 |
Number of directors of the Company who are also limited partners | 2 |
Common Units of partnership not owned by the Company (in shares) | 3,700,000 |
Number of common units required to convert to one share of common stock (in shares) | 1 |
Common Stock par value | $ 0.01 | $ 0.01
Number of trading days preceeding Redemption Notice Date (in days) | 10 |
Common units redeemed for a like number of common shares of stock (in shares) | 2,000 |
Number of Common Stock sold at the market during period (in shares) | 785,500 |
Average price of Common Stock sold at the market during period (in dollars per share) | $ 32.82 |
Net proceeds of Common Stock sold at the market during period | $ 25.4 |

X
- Definition Area of undeveloped land parcels owned in acres. + References No definition available. + Details
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- Definition Area of undeveloped land parcels owned in acres, considered core holdings. + References No definition available. + Details
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- Definition The average price of Common Stock sold "at the market" during the period. + References No definition available. + Details
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- Definition The number of units held by the Company. + References No definition available. + Details
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- Definition The percentage of units held by the Company. + References No definition available. + Details
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- Definition The net proceeds of Common Stock sold "at the market" during the period. + References No definition available. + Details
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- Definition The number of real estate properties, completed but not yet stabilized as of the balance sheet date. We consider a development project to be stabilized upon the earlier of the original projected stabilization date or the date such project is at least 95% occupied. + References No definition available. + Details
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- Definition The number of directors who are also limited partners of the Operating Partnership + References No definition available. + Details
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- Definition The number of officers who are also limited partners of the Operating Partnership. + References No definition available. + Details
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- Definition The number of properties which were acquired directly or through foreclosure for which a committed plan to sell exists and an active program to market such properties has been initiated. + References No definition available. + 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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