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Fair Value of Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2012
Fair Value Disclosures [Abstract] |
Schedule of financial instruments with fair values different from their carrying amount |
| June 30, 2012 |  | December 31, 2011
| Carrying Amount |  |  | Fair Value |  | Carrying Amount |  |  | Fair Value
Mortgage notes payable, net of discounts | $ | 506,363 |  |  |  | $ | 553,976 |  |  | $ | 512,391 |  |  |  | $ | 545,784 |
Unsecured notes payable, net of discounts | $ | 1,330,618 |  |  |  | $ | 1,411,533 |  |  | $ | 1,496,501 |  |  |  | $ | 1,555,633 |
Variable rate debt | $ | 678,610 |  |  |  | $ | 676,693 |  |  | $ | 391,610 |  |  |  | $ | 380,786 |
Notes receivable | $ | 7,226 |  |  |  | $ | 8,785 |  |  | $ | 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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- Definition Schedule of financial instruments with fair values different from their carrying amount table. + References No definition available. + Details
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