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Fair Value of Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 2012
Fair Value Disclosures [Abstract] |
Schedule of financial instruments with fair values different from their carrying amount |
| September 30, 2012 |  | December 31, 2011
| Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
Mortgage notes payable | $ | 503,181 |  |  | $ | 548,413 |  |  | $ | 512,391 |  |  | $ | 545,784 |
Unsecured notes payable | $ | 1,330,198 |  |  | $ | 1,458,187 |  |  | $ | 1,496,501 |  |  | $ | 1,555,633 |
Variable rate debt | $ | 678,610 |  |  | $ | 676,693 |  |  | $ | 391,610 |  |  | $ | 380,786 |
Notes receivable | $ | 7,226 |  |  | $ | 9,790 |  |  | $ | 31,157 |  | (a) | $ | 32,756 |
(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 two properties in 2009 accounted for under the accounting standard for installment sales.

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