Investment In Real Estate Joint Ventures And Partnerships (Combined Condensed Statements Of Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Investment In Real Estate Joint Ventures And Partnerships [Line Items]
Revenues, net	$ 125,620	$ 123,325	$ 247,054	$ 240,531
Expenses:
Depreciation and amortization	34,332	33,457	68,431	66,154
Interest, net	29,311	37,036	60,740	73,649
Operating	24,315	23,646	47,103	44,925
Real estate taxes, net	14,744	13,736	28,801	27,914
General and administrative	6,378	6,600	14,684	13,136
Provision for income taxes	(220)	(190)	(242)	(506)
Impairment loss	4,293	18,891	11,145	19,661
Total	84,062	96,330	170,164	171,790
Gain (loss) on sale of property	84	136	524	1,196
Net Income	32,761	2,939	55,399	20,127
Unconsolidated Real Estate Joint Ventures [Member]
Investment In Real Estate Joint Ventures And Partnerships [Line Items]
Revenues, net	50,026	50,866	99,873	102,192
Expenses:
Depreciation and amortization	15,481	16,913	31,617	34,544
Interest, net	8,961	9,573	18,047	18,837
Operating	8,571	8,936	17,196	17,830
Real estate taxes, net	6,159	6,128	12,397	12,606
General and administrative	225	877	586	1,969
Provision for income taxes	95	116	168	201
Impairment loss	96,498	0	96,498	2,058
Total	135,990	42,543	176,509	88,045
Gain (loss) on sale of property	246	0	246	(21)
Net Income	$ (85,718)	$ 8,323	$ (76,390)	$ 14,126