Investment In Real Estate Joint Ventures And Partnerships (Combined Condensed Statements Of Income) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenues, net	$ 141,225	$ 137,791	$ 275,320	$ 273,883
Depreciation and amortization	39,609	37,685	78,040	73,542
Interest, net	37,324	37,280	74,170	74,719
Operating	26,839	25,581	51,122	51,373
Real estate taxes, net	16,327	16,218	33,072	32,973
General and administrative	6,612	6,069	13,168	12,660
Provision for income taxes	119	(320)	(197)	156
Impairment loss	18,892	15,825	19,662	16,061
Income from Continuing Operations	5,065	2,920	22,259	21,965
Loss on sale of property	(135)	6	(233)	(842)
Net Income	2,939	3,670	20,127	23,792
Equity Method Investments [Member]
Revenues, net	50,866	47,080	102,192	94,607
Depreciation and amortization	16,913	15,298	34,544	30,643
Interest, net	9,573	8,742	18,837	18,141
Operating	8,936	7,915	17,830	16,145
Real estate taxes, net	6,128	6,450	12,606	12,479
General and administrative	877	1,001	1,969	1,897
Provision for income taxes	116	85	201	145
Impairment loss		231	2,058	231
Income from Continuing Operations	42,543	39,722	88,045	79,681
Loss on sale of property			(21)	(3)
Net Income	$ 8,323	$ 7,358	$ 14,126	$ 14,923