Segment Information (Schedule Of Segment's Contribution To Consolidated Revenues And Net Operating Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Segment Reporting Information [Line Items]
Revenues	$ 80,276	$ 73,531
Consolidated property net operating income	45,417	40,698
Interest income	51	92
Other revenues	222	216
Depreciation	(19,341)	(18,752)
Interest expense	(11,645)	(14,475)
Amortization of deferred financing costs	(661)	(647)
General and administrative	(4,285)	(4,116)
Investment and development	(480)	(478)
Other investment costs	(306)	(494)
Gains on condominium sales activities, net	6,904	744
Equity in income of unconsolidated real estate entities, net	6,446	209
Other income (expense), net	(156)	16
Net loss on extinguishment of indebtedness	(301)
Net income	21,865	3,013
Fully Stabilized Communities [Member]
Segment Reporting Information [Line Items]
Revenues	73,320	68,017
Consolidated property net operating income	45,066	40,626
Acquired Communities [Member]
Segment Reporting Information [Line Items]
Revenues	1,058
Consolidated property net operating income	584
Other Property Segments [Member]
Segment Reporting Information [Line Items]
Revenues	5,676	5,298
Consolidated property net operating income	(233)	72
Other [Member]
Segment Reporting Information [Line Items]
Revenues	$ 222	$ 216