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Mortgages and Notes Payable (Details) (USD $) |  |  |  |  |  |  | 6 Months Ended |  | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2011 | Dec. 31, 2010 | Jun. 30, 2011 Secured indebtedness [Member] | Dec. 31, 2010 Secured indebtedness [Member] | Jun. 30, 2011 Unsecured indebtedness [Member] | Dec. 31, 2010 Unsecured indebtedness [Member] | Jun. 30, 2011 Bank term loan [Member] | Jun. 30, 2011 Unsecured revolving credit facility [Member] | Jul. 20, 2011 Unsecured revolving credit facility [Member] | Jun. 30, 2011 Secured construction facility [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total mortgages and notes payable | $ 1,615,068,000 | $ 1,522,945,000 | $ 748,563,000 | $ 754,399,000 | $ 866,505,000 | $ 768,546,000 |  |  |  |
Aggregate undepreciated book value of secured real estate assets | 1,200,000,000 |  |  |  |  |  |  |  |  |
Term of debt instrument (in years) |  |  |  |  |  |  | 3 |  |  |
Early repayment of debt |  |  |  |  |  |  | 10,000,000 |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  | 400,000,000 |  | 52,100,000
Maturity date |  |  |  |  |  |  |  | Feb. 21, 2013 |  | Dec. 20, 2011
Additional borrowing capacity |  |  |  |  |  |  |  | 50,000,000 |  |
Interest rate |  |  |  |  |  |  |  | LIBOR plus 290 basis points |  | LIBOR plus 85 basis points
Annual facility fee (in hundredths) |  |  |  |  |  |  |  | 0.60% |  |
Amount outstanding |  |  |  |  |  |  |  | 75,400,000 | 77,000,000 | 52,100,000
Outstanding letters of credit |  |  |  |  |  |  |  | 200,000 | 200,000 |
Unused borrowing capacity |  |  |  |  |  |  |  | $ 324,400,000 | $ 322,800,000 |
Term of optional extension (in years) |  |  |  |  |  |  |  |  |  | 1

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- Definition Amount of additional borrowing capacity that may be granted under an accordion feature of the credit facility, subject to additional lender commitments. + Details
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- Definition Reflects when the credit facility terminates, which is presented in a variety of ways (years, month and year, day, month, and year, quarter). + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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