Condensed Consolidated Statements Of Operations And Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenues:
Rentals, net	$ 129,023	$ 116,103
Other	2,658	2,699
Total	131,681	118,802
Expenses:
Depreciation and amortization	39,719	33,231
Operating	25,356	22,419
Real estate taxes, net	15,202	13,810
Impairment loss	56	6,852
General and administrative	6,667	8,307
Total	87,000	84,619
Operating Income	44,681	34,183
Interest Expense, net	(17,952)	(31,297)
Interest and Other Income, net	1,826	2,386
Gain on Sale of Real Estate Joint Venture and Partnership Interests	11,509	5,562
Equity in Earnings of Real Estate Joint Ventures and Partnerships, net	4,613	4,075
Benefit for Income Taxes	153	22
Income from Continuing Operations	44,830	14,931
Operating (Loss) Income from Discontinued Operations	(155)	3,633
Gain on Sale of Property from Discontinued Operations	0	3,634
(Loss) Income from Discontinued Operations	(155)	7,267
Gain on Sale of Property	142	440
Net Income	44,817	22,638
Less: Net Income Attributable to Noncontrolling Interests	(1,467)	(1,441)
Net Income Adjusted for Noncontrolling Interests	43,350	21,197
Dividends on Preferred Shares	(7,440)	(8,869)
Redemption Costs of Preferred Shares	(2,242)	0
Net Income Attributable to Common Shareholders	33,668	12,328
Earnings Per Common Share - Basic:
Income from continuing operations attributable to common shareholders	$ 0.28	$ 0.04
(Loss) income from discontinued operations	$ 0.00	$ 0.06
Net income attributable to common shareholders	$ 0.28	$ 0.10
Earnings Per Common Share - Diluted:
Income from continuing operations attributable to common shareholders	$ 0.28	$ 0.04
(Loss) income from discontinued operations	$ 0.00	$ 0.06
Net income attributable to common shareholders	$ 0.28	$ 0.10
Comprehensive Income:
Net Income	44,817	22,638
Other Comprehensive Income (Loss):
Net unrealized (loss) gain on derivatives	(2,107)	16
Amortization of loss on derivatives	656	659
Retirement liability adjustment	365	0
Total	(1,086)	675
Comprehensive Income	43,731	23,313
Comprehensive Income Attributable to Noncontrolling Interests	(1,467)	(1,441)
Comprehensive Income Adjusted for Noncontrolling Interests	$ 42,264	$ 21,872