Investment In Real Estate Joint Ventures And Partnerships (Combined Condensed Statements Of Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Investment In Real Estate Joint Ventures And Partnerships [Line Items]
Revenues, net	$ 129,545	$ 122,869	$ 372,214	$ 359,005
Expenses:
Depreciation and amortization	36,623	33,487	103,909	98,489
Interest, net	28,109	35,475	88,587	108,268
Operating	26,583	22,494	73,088	66,777
Real estate taxes, net	15,259	14,658	43,557	42,054
General and administrative	6,421	5,762	21,105	18,898
Provision for income taxes	733	471	462	(67)
Impairment loss	159	31,658	9,908	51,319
Total	85,045	108,059	251,567	277,537
Gain (loss) on sale of property	335	392	859	1,588
Net Income (Loss)	42,047	(35,958)	97,446	(15,831)
Unconsolidated Real Estate Joint Ventures [Member]
Investment In Real Estate Joint Ventures And Partnerships [Line Items]
Revenues, net	49,726	52,501	149,599	154,693
Expenses:
Depreciation and amortization	15,071	16,507	46,688	51,051
Interest, net	8,956	9,557	27,003	28,394
Operating	9,069	8,961	26,265	26,791
Real estate taxes, net	6,322	6,001	18,719	18,607
General and administrative	420	865	1,006	2,834
Provision for income taxes	81	85	249	286
Impairment loss	283	26,718	96,781	28,776
Total	40,202	68,694	216,711	156,739
Gain (loss) on sale of property	2,177	0	2,423	(21)
Net Income (Loss)	$ 11,701	$ (16,193)	$ (64,689)	$ (2,067)