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Description of Business and Significant Accounting Policies (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 acre sqft | Dec. 31, 2010 | Dec. 31, 2009
Description of Business [Abstract] |  |  |
In-service office, industrial and retail properties (in units) | 303 |  |
Square footage of commercial property (in sq feet) | 29,300,000 |  |
Rental residential units (in units) | 96 |  |
Residential condominiums for sale (in units) | 17 |  |
Undeveloped land suitable for future development (in acres) | 586.0 |  |
Undeveloped land considered core holdings (in acres) | 524 |  |
Office properties completed but not yet stabilized (in units) | 1 |  |
Percentage of equity interest in joint ventures maximum | 50.00% |  |
Number of real estate properties not wholly owned (in units) | 35 |  |
Number of rental residential properties under development not wholly owned (in units) | 1 |  |
Area of undeveloped land not wholly owned (in acres) | 11 |  |
Ownership interest in unconsolidated property directly owned by the Company | 12.50% |  |
Square footage of unconsolidated property directly owned by the Company (in sq feet) | 261,000 |  |
Consolidated in-service office properties not wholly owned (in units) | 5 |  |
Common Units of partnership owned (in shares) | 72,200,000 |  |
Percentage of ownership of Common Units | 95.10% | 95.00% |
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) | 64,469 |  |
Real estate assets, depreciation expense | $ 120,812 | $ 117,639 | $ 115,603
Maturity of highly liquid investments (in months) | 3 |  |
Percent of annual REIT taxable income required to pay to the Company's stockholders | 90.00% |  |
Customers with leases on wholly owned properties | 1,722 |  |
Percent of annualized cash rental revenue derived from geographic locations | 10.00% |  |
Limit of consolidated revenue generated by any single customer | 10.00% |  |
Adjustment interval of variable debt interest rates, mimimum (in months) | 1 |  |
Adjustment interval of variable debt interest rates, maximum (in months) | 3 |  |
Building [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life, Average | 40 |  |
Building Improvements [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life, Average | 15 |  |
Furniture and Fixtures [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life, Minimum | 5 |  |
Property, Plant and Equipment, Useful Life, Maximum | 7 |  |
Leaseholds and Leasehold Improvements [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life, Minimum | 3 |  |
Property, Plant and Equipment, Useful Life, Maximum | 10 |  |

X
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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 Area of undeveloped land parcels owned by unconsolidated affiliates in acres + References No definition available. + Details
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- Definition Minimum percent of annual REIT taxable income, excluding net capital gains, that is required to pay to stockholders to maintain qualification as a REIT. + 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 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 Number of trading days immediately preceeding the redemption notice date used to calculate value. + References No definition available. + Details
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- Definition Ownership interest in an unconsolidated property directly owned by the Company. + References No definition available. + Details
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