Condensed Consolidated Statements Of Operations And Comprehensive Income (Loss) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenues:
Rentals, net	$ 126,406	$ 119,746	$ 363,770	$ 347,882
Other	3,139	3,123	8,444	11,123
Total	129,545	122,869	372,214	359,005
Expenses:
Depreciation and amortization	36,623	33,487	103,909	98,489
Operating	26,583	22,494	73,088	66,777
Real estate taxes, net	15,259	14,658	43,557	42,054
Impairment loss	159	31,658	9,908	51,319
General and administrative	6,421	5,762	21,105	18,898
Total	85,045	108,059	251,567	277,537
Operating Income	44,500	14,810	120,647	81,468
Interest Expense, net	(28,109)	(35,475)	(88,587)	(108,268)
Interest and Other Income (Loss), net	1,818	(494)	4,786	2,984
Gain on Sale of Real Estate Joint Venture and Partnership Interests	0	0	5,562	0
Equity in Earnings (Losses) of Real Estate Joint Ventures and Partnerships, net	4,905	(3,034)	(6,715)	3,942
Gain on Acquisition	1,869	0	1,869	0
(Provision) Benefit for Income Taxes	(733)	(471)	(462)	67
Income (Loss) from Continuing Operations	24,250	(24,664)	37,100	(19,807)
Operating Income (Loss) from Discontinued Operations	2,636	(12,272)	9,763	1,802
Gain on Sale of Property from Discontinued Operations	14,826	586	49,724	586
Income (Loss) from Discontinued Operations	17,462	(11,686)	59,487	2,388
Gain on Sale of Property	335	392	859	1,588
Net Income (Loss)	42,047	(35,958)	97,446	(15,831)
Less: Net (Income) Loss Attributable to Noncontrolling Interests	(1,774)	2,738	(4,557)	410
Net Income (Loss) Adjusted for Noncontrolling Interests	40,273	(33,220)	92,889	(15,421)
Dividends on Preferred Shares	(8,869)	(8,869)	(26,607)	(26,607)
Net Income (Loss) Attributable to Common Shareholders	31,404	(42,089)	66,282	(42,028)
Earnings Per Common Share - Basic:
Income (loss) from continuing operations attributable to common shareholders	$ 0.12	$ (0.25)	$ 0.06	$ (0.37)
Income (loss) from discontinued operations	$ 0.14	$ (0.10)	$ 0.49	$ 0.02
Net income (loss) attributable to common shareholders	$ 0.26	$ (0.35)	$ 0.55	$ (0.35)
Earnings Per Common Share - Diluted:
Income (loss) from continuing operations attributable to common shareholders	$ 0.12	$ (0.25)	$ 0.05	$ (0.37)
Income (loss) from discontinued operations	$ 0.14	$ (0.10)	$ 0.49	$ 0.02
Net income (loss) attributable to common shareholders	$ 0.26	$ (0.35)	$ 0.54	$ (0.35)
Comprehensive Income (Loss):
Net Income (Loss)	42,047	(35,958)	97,446	(15,831)
Net unrealized loss on derivatives	(49)	(542)	(181)	(832)
Amortization of loss on derivatives	664	654	1,985	1,892
Comprehensive Income (Loss)	42,662	(35,846)	99,250	(14,771)
Comprehensive (Income) Loss Attributable to Noncontrolling Interests	(1,774)	2,738	(4,557)	410
Comprehensive Income (Loss) Adjusted for Noncontrolling Interests	$ 40,888	$ (33,108)	$ 94,693	$ (14,361)