Consolidated Statements of Income (Unaudited) (USD $) Share data in Thousands, except Per Share data	3 Months Ended				6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010		Jun. 30, 2011		Jun. 30, 2010
Revenues:
Rental income	$ 239,703,000		$ 141,764,000		$ 406,848,000		$ 274,761,000
Resident fees and services	123,149,000				194,435,000
Interest income	12,866,000		9,335,000		24,575,000		18,383,000
Other income	5,341,000		2,650,000		8,165,000		3,646,000
Total revenues	381,059,000		153,749,000		634,023,000		296,790,000
Expenses:
Interest expense	83,961,000		35,478,000		142,347,000		63,403,000
Property operating expenses	100,197,000		11,970,000		164,126,000		23,761,000
Depreciation and amortization	110,382,000		44,037,000		183,186,000		84,042,000
Transaction costs	13,738,000		752,000		49,803,000		8,466,000
General and administrative	19,562,000		11,878,000		37,276,000		28,700,000
Loss (gain) on extinguishment of debt			7,035,000				25,072,000
Provision for loan losses	168,000				416,000
Total expenses	328,008,000		111,150,000		577,154,000		233,444,000
Income from continuing operations before income taxes and income from unconsolidated joint ventures	53,051,000		42,599,000		56,869,000		63,346,000
Income tax (expense) benefit	(211,000)		(188,000)		(340,000)		(273,000)
Income from unconsolidated joint ventures	971,000		1,828,000		2,514,000		2,596,000
Income from continuing operations	53,811,000		44,239,000		59,043,000		65,669,000
Discontinued operations:
Gain (loss) on sales of properties	30,224,000		3,314,000		56,380,000		10,033,000
Impairment of assets					(202,000)
Income (loss) from discontinued operations, net	2,173,000		3,511,000		2,797,000		7,056,000
Discontinued operations, net	32,397,000		6,825,000		58,975,000		17,089,000
Net income	86,208,000		51,064,000		118,018,000		82,758,000
Less: Preferred stock dividends	17,353,000		5,484,000		26,033,000		10,993,000
Less: Net income (loss) attributable to noncontrolling interests(1)	(992,000)	[1]	(66,000)	[1]	(1,234,000)	[1]	307,000	[1]
Net income attributable to common stockholders	$ 69,847,000		$ 45,646,000		$ 93,219,000		$ 71,458,000
Average number of common shares outstanding:
Basic	176,445		123,808		165,755		123,541
Diluted	177,488		124,324		166,458		124,059
Basic:
Income from continuing operations attributable to common stockholders	$ 0.21		$ 0.31		$ 0.20		$ 0.44
Discontinued operations, net	$ 0.18		$ 0.06		$ 0.36		$ 0.14
Net income attributable to common stockholders	$ 0.40	[2]	$ 0.37	[2]	$ 0.56	[2]	$ 0.58	[2]
Diluted:
Income from continuing operations attributable to common stockholders	$ 0.21		$ 0.31		$ 0.20		$ 0.44
Discontinued operations, net	$ 0.18		$ 0.05		$ 0.35		$ 0.14
Net income attributable to common stockholders	$ 0.39	[2]	$ 0.37	[2]	$ 0.56	[2]	$ 0.58	[2]
Dividends declared and paid per common share	$ 0.715		$ 0.68		$ 1.405		$ 1.36

[1] Includes amounts attributable to redeemable noncontrolling interests.

[2] Amounts may not sum due to rounding