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Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
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Company's estimates of fair value differ from the carrying amounts |  |  |  |
Mortgage payable, net of premiums, Carrying Amount | $ 512,391 |  | $ 712,246 |
Mortgage payable, net of premiums, Fair Value | 545,784 |  | 726,348 |
Unsecured notes payable, net of discounts, Carrying Amount | 1,496,501 |  | 1,277,716 |
Unsecured notes payable, net of discounts, Fair Value | 1,555,633 |  | 1,338,743 |
Variable rate debt instruments, Carrying Amount | 391,610 |  | 444,610 |
Variable rate debt instruments, Fair Value | 380,786 |  | 432,556 |
Notes receivable, Carrying Amount | 31,157 | [1] | 31,216 | [1]
Notes receivable, Fair Value | $ 32,756 |  | $ 28,921 |
[1] | For purposes of this disclosure, one of the notes is presented gross of the deferred gain of $12.9 million arising from the sale of the two Trenton properties in 2009 accounted for under the accounting standard for installment sales.

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- Definition Secured Debt Principal Balance Outstanding. + References No definition available. + Details
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- Definition Secured Debt Principal Balance Outstanding Fair Value Disclosure. + References No definition available. + Details
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- Definition Unsecured notes payable, net of discounts, Carrying Amount. + References No definition available. + Details
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- Definition Unsecured notes payable, net of discounts, Fair Value. + References No definition available. + Details
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- Definition Variable Rate Debt Instruments, Carrying Amount. + References No definition available. + Details
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- Definition Variable Rate Debt Instruments, Fair Value. + References No definition available. + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. An amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money at a future date(s). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph b -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition For an unclassified balance sheet, an amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money at a future date(s). Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(3)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 9 -Section 03 -Paragraph 10 -Subparagraph 3 + Details
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