Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2012

Fair Value Disclosures [Abstract]

Schedule of financial instruments with fair values different from their carrying amount

	March 31, 2012					December 31, 2011
	Carrying Amount			Fair Value		Carrying Amount			Fair Value
Mortgage notes payable, net of discounts	$	509,450		$	557,012	$	512,391		$	545,784
Unsecured notes payable, net of discounts	$	1,492,520		$	1,567,620	$	1,496,501		$	1,555,633
Variable rate debt	$	678,610		$	676,693	$	391,610		$	380,786
Notes receivable	$	30,962	(a)	$	32,406	$	31,157	(a)	$	32,756

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(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.