Condensed Consolidated Statements Of Operations And Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Revenues:
Rentals, net	$ 123,005	$ 117,843	$ 241,724	$ 232,511
Other	2,615	5,482	5,330	8,020
Total	125,620	123,325	247,054	240,531
Expenses:
Depreciation and amortization	34,332	33,457	68,431	66,154
Operating	24,315	23,646	47,103	44,925
Real estate taxes, net	14,744	13,736	28,801	27,914
Impairment loss	4,293	18,891	11,145	19,661
General and administrative	6,378	6,600	14,684	13,136
Total	84,062	96,330	170,164	171,790
Operating Income	41,558	26,995	76,890	68,741
Interest Expense, net	(29,311)	(37,036)	(60,740)	(73,649)
Interest and Other Income, net	582	1,423	2,968	3,478
Gain on Sale of Real Estate Joint Venture and Partnership Interests	0	0	5,562	0
Equity in (Losses) Earnings of Real Estate Joint Ventures and Partnerships, net	(15,695)	3,579	(11,620)	6,976
Benefit for Income Taxes	220	190	242	506
(Loss) Income from Continuing Operations	(2,646)	(4,849)	13,302	6,052
Operating Income from Discontinued Operations	4,059	7,652	6,675	12,879
Gain on Sale of Property from Discontinued Operations	31,264	0	34,898	0
Income from Discontinued Operations	35,323	7,652	41,573	12,879
Gain on Sale of Property	84	136	524	1,196
Net Income	32,761	2,939	55,399	20,127
Less: Net Income Attributable to Noncontrolling Interests	(1,342)	(1,236)	(2,783)	(2,328)
Net Income Adjusted for Noncontrolling Interests	31,419	1,703	52,616	17,799
Dividends on Preferred Shares	(8,869)	(8,869)	(17,738)	(17,738)
Net Income (Loss) Attributable to Common Shareholders	22,550	(7,166)	34,878	61
Earnings Per Common Share - Basic:
Loss from continuing operations attributable to common shareholders	$ (0.10)	$ (0.12)	$ (0.05)	$ (0.11)
Income from discontinued operations	$ 0.29	$ 0.06	$ 0.34	$ 0.11
Net income (loss) attributable to common shareholders	$ 0.19	$ (0.06)	$ 0.29	$ 0.00
Earnings Per Common Share - Diluted:
Loss from continuing operations attributable to common shareholders	$ (0.10)	$ (0.12)	$ (0.05)	$ (0.11)
Income from discontinued operations	$ 0.29	$ 0.06	$ 0.34	$ 0.11
Net income (loss) attributable to common shareholders	$ 0.19	$ (0.06)	$ 0.29	$ 0.00
Comprehensive Income:
Net Income	32,761	2,939	55,399	20,127
Net unrealized loss on derivatives	(148)	(401)	(132)	(290)
Amortization of loss on derivatives	662	619	1,321	1,238
Comprehensive Income	33,275	3,157	56,588	21,075
Comprehensive Income Attributable to Noncontrolling Interests	(1,342)	(1,236)	(2,783)	(2,328)
Comprehensive Income Adjusted for Noncontrolling Interests	$ 31,933	$ 1,921	$ 53,805	$ 18,747