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Mortgages and Notes Payable (Details) (USD $) |  |  | 3 Months Ended |  | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2012 | Dec. 31, 2011 | Mar. 31, 2012 Revolving Credit Facility due 2015 [Member] | Apr. 26, 2012 Revolving Credit Facility due 2015 [Member] | Mar. 31, 2012 Variable Rate Term Loan due 2016 [Member] | Mar. 31, 2012 Secured indebtedness [Member] | Dec. 31, 2011 Secured indebtedness [Member] | Mar. 31, 2012 Unsecured indebtedness [Member] | Dec. 31, 2011 Unsecured indebtedness [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgages and notes payable | $ 1,903,978,000 | $ 1,903,213,000 |  |  |  | $ 746,784,000 | $ 750,049,000 | $ 1,157,194,000 | $ 1,153,164,000
Aggregate undepreciated book value of secured real estate assets |  |  |  |  |  | 1,200,000,000 |  |  |
Maximum borrowing capacity on revolving credit facility |  |  | 475,000,000 |  |  |  |  |  |
Maturity date on revolving credit facility |  |  | Jul. 27, 2015 |  |  |  |  |  |
Additional borrowing capacity on revolving credit facility |  |  | 75,000,000 |  |  |  |  |  |
Interest rate |  |  | LIBOR plus 150 basis points |  |  |  |  |  |
Annual facility fee (in hundredths) |  |  | 0.35% |  |  |  |  |  |
Amount outstanding on revolving credit facility |  |  | 141,000,000 | 112,000,000 |  |  |  |  |
Outstanding letters of credit on revolving credit facility |  |  | 200,000 | 200,000 |  |  |  |  |
Unused borrowing capacity on revolving credit facility |  |  | 333,800,000 | 362,800,000 |  |  |  |  |
Principal amount of debt |  |  |  |  | $ 225,000,000 |  |  |  |
Term of debt instrument (in years) |  |  |  |  | 7 |  |  |  |
Interest rate basis |  |  |  |  | LIBOR plus 190 basis points |  |  |  |

X
- Definition Amount of additional borrowing capacity that may be granted under an accordion feature of the credit facility, subject to additional lender commitments. + References No definition available. + 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). + References No definition available. + Details
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- Definition The undepreciated book value of real estate assets that are used to secure certain mortgages and notes payable. + References No definition available. + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -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 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + 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 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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