Investment In Real Estate Joint Ventures And Partnerships (Combined Condensed Statements Of Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Investment In Real Estate Joint Ventures And Partnerships [Line Items]
Revenues, net	$ 122,471	$ 118,107
Depreciation and amortization	34,377	32,951
Interest, net	31,429	36,694
Operating	23,014	21,526
Real estate taxes, net	14,164	14,285
General and administrative	8,307	6,536
Provision for income taxes	(22)	(316)
Impairment loss	6,852	770
Total	16,373	11,113
Loss on sale of property	440	1,060
Net income	22,638	17,188
Unconsolidated Real Estate Joint Ventures [Member]
Investment In Real Estate Joint Ventures And Partnerships [Line Items]
Revenues, net	49,847	51,326
Depreciation and amortization	16,136	17,631
Interest, net	9,086	9,264
Operating	8,625	8,894
Real estate taxes, net	6,238	6,478
General and administrative	361	1,092
Provision for income taxes	73	85
Impairment loss		2,058
Total	40,519	45,502
Loss on sale of property		(21)
Net income	$ 9,328	$ 5,803