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Fair Value of Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2011
Fair Value of Financial Instruments (Tables) [Abstract] |
Schedule of financial instruments with fair values different from their carrying amount |
|  | June 30, 2011 |  |  | December 31, 2010 |
|  | Carrying |  |  | Fair |  |  | Carrying |  |  | Fair |
|  | Amount |  |  | Value |  |  | Amount |  |  | Value |
Mortgage payable, net of discounts |  | $ | 588,823 |  |  | $ | 602,815 |  |  | $ | 711,789 |  |  | $ | 726,348 |
Unsecured notes payable, net of discounts |  | $ | 1,573,588 |  |  | $ | 1,702,493 |  |  | $ | 1,274,047 |  |  | $ | 1,338,743 |
Variable rate debt instruments |  | $ | 303,610 |  |  | $ | 295,131 |  |  | $ | 444,610 |  |  | $ | 432,556 |
Notes receivable |  | $ | 32,255 | (a) |  | $ | 29,995 |  |  | $ | 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 two properties in 2009 accounted for under the accounting standard for installment sales.

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