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Mortgages and Notes Payable (Details) (USD $) |  |  |  |  |  |  | 9 Months Ended |  | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2011 | Dec. 31, 2010 | Sep. 30, 2011 Secured indebtedness [Member] | Dec. 31, 2010 Secured indebtedness [Member] | Sep. 30, 2011 Unsecured indebtedness [Member] | Dec. 31, 2010 Unsecured indebtedness [Member] | Sep. 30, 2011 Unsecured revolving credit facility [Member] | Oct. 20, 2011 Unsecured revolving credit facility [Member] | Sep. 30, 2011 Secured construction facility [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total mortgages and notes payable | $ 1,893,981,000 | $ 1,522,945,000 | $ 937,846,000 | $ 754,399,000 | $ 956,135,000 | $ 768,546,000 |  |  |
Aggregate undepreciated book value of secured real estate assets | 1,500,000,000 |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | 475,000,000 |  |
Maximum borrowing capacity for previous revolving credit facility |  |  |  |  |  |  | 400,000,000 |  |
Maturity date |  |  |  |  |  |  | Jul. 27, 2015 |  | Dec. 20, 2011
Additional borrowing capacity |  |  |  |  |  |  | 75,000,000 |  |
Interest rate |  |  |  |  |  |  | LIBOR plus 150 basis points |  | LIBOR plus 85 basis points
Annual facility fee (in hundredths) |  |  |  |  |  |  | 0.35% |  |
Amount outstanding |  |  |  |  |  |  | 165,000,000 | 347,000,000 | 52,100,000
Outstanding letters of credit |  |  |  |  |  |  | 200,000 | 200,000 |
Unused borrowing capacity |  |  |  |  |  |  | $ 309,800,000 | $ 127,800,000 |
Term of optional extension (in years) |  |  |  |  |  |  | 1 |  | 1

X
- 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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X
- 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 The maximum borrowing capacity for previously existing revolving credit facility. + Details
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- Definition The period for which there is an option to extend the maturity date of the facility, in years. + Details
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- Definition The undepreciated book value of real estate assets that are used to secure certain mortgages and notes payable. + 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 The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + 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 The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + Details
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- Definition Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions). + 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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- 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 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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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of all notes and loans payable (with maturities initially due after one year or beyond the operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 7 -Section 03 -Paragraph 16 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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