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Fair Value of Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2011
Fair Value Disclosures [Abstract] |
Schedule of financial instruments with fair values different from their carrying amount |
| December 31, 2011 |  | December 31, 2010
| Carrying Amount |  |  | Fair Value |  | Carrying Amount |  |  | Fair Value
Mortgage payable, net of premiums | $ | 512,391 |  |  |  | $ | 545,784 |  |  | $ | 712,246 |  |  |  | $ | 726,348 |
Unsecured notes payable, net of discounts | $ | 1,496,501 |  |  |  | $ | 1,555,633 |  |  | $ | 1,277,716 |  |  |  | $ | 1,338,743 |
Variable Rate Debt Instruments | $ | 391,610 |  |  |  | $ | 380,786 |  |  | $ | 444,610 |  |  |  | $ | 432,556 |
Notes Receivable | $ | 31,157 |  | (a) |  | $ | 32,756 |  |  | $ | 31,216 |  | (a) |  | $ | 28,921 |
(a) | 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 Schedule of financial instruments with fair values different from their carrying amount table. + References No definition available. + Details
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