CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Rental income	$ 222,181	$ 195,817	$ 436,697	$ 390,896
Expenses:
Operating expenses	90,161	81,352	180,568	162,822
Depreciation and amortization	51,973	45,233	105,814	90,673
General and administrative	11,618	9,554	22,569	18,804
Loss on asset impairment		21,491		21,491
Acquisition related costs	2,415	1,103	5,060	1,413
Total expenses	156,167	158,733	314,011	295,203
Operating income	66,014	37,084	122,686	95,693
Interest and other income	392	447	1,062	1,565
Interest expense (including net amortization of debt discounts, premiums and deferred financing fees of $1,920, $1,710, $3,952 and $3,476, respectively)	(48,200)	(44,659)	(95,614)	(89,524)
Equity in earnings of investees	2,910	2,305	5,622	4,644
Gain on issuance of shares by an equity investee				16,418
Income (loss) from continuing operations before income tax expense	21,116	(4,823)	33,756	28,796
Income tax expense	(90)	(181)	(436)	(363)
Income (loss) from continuing operations	21,026	(5,004)	33,320	28,433
Discontinued operations:
(Loss) income from discontinued operations	(1,062)	3,498	(1,316)	7,358
Gain on sale of properties from discontinued operations			34,572
Income (loss) before gain on sale of properties	19,964	(1,506)	66,576	35,791
Gain on sale of properties		11,504		11,504
Net income	19,964	9,998	66,576	47,295
Preferred distributions	(10,500)	(12,667)	(19,339)	(25,334)
Net income (loss) available for common shareholders	$ 9,464	$ (2,669)	$ 47,237	$ 21,961
Weighted average common shares outstanding - basic (in shares)	72,144	64,595	72,142	60,685
Weighted average common shares outstanding - diluted (in shares)	79,442	71,893	79,440	67,983
Basic and diluted earnings per common share:
Income (loss) from continuing operations available for common shareholders (in dollars per share)	$ 0.15	$ (0.10)	$ 0.19	$ 0.24
(Loss) income from discontinued operations (in dollars per share)	$ (0.01)	$ 0.05	$ 0.46	$ 0.12
Net income (loss) available for common shareholders (in dollars per share)	$ 0.13	$ (0.04)	$ 0.65	$ 0.36