Consolidated Statements of Comprehensive Income (Unaudited) (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:
Rental income	$ 278,067		$ 228,246		$ 541,208		$ 384,009
Resident fees and services	165,654		123,149		323,828		194,435
Interest income	7,879		12,866		16,020		24,575
Other income	1,482		5,341		3,166		8,165
Total revenues	453,082		369,602		884,222		611,184
Expenses:
Interest expense	94,968		81,484		186,941		137,613
Property operating expenses	136,303		99,808		265,572		163,371
Depreciation and amortization	131,917		107,255		256,821		176,939
General and administrative	25,870		19,562		53,621		37,276
Transaction costs	28,691		13,738		34,270		49,803
Loss (gain) on derivatives	2,676		0		2,121		0
Loss (gain) on extinguishment of debt	576		0		576		0
Provision for loan losses	0		168		0		416
Total expenses	415,649		322,015		795,680		565,418
Income (loss) from continuing operations before income taxes and income from unconsolidated entities	37,433		47,587		88,542		45,766
Income tax (expense) benefit	(1,447)		(211)		(2,918)		(340)
Income from unconsolidated entities	1,456		971		2,989		2,514
Income (loss) from continuing operations	37,442		48,347		88,613		47,940
Discontinued operations:
Gain (loss) on sales of properties	32,450		30,224		33,219		56,380
Impairment of assets	0		0		0		(202)
Income (loss) from discontinued operations, net	6,983		7,637		12,497		13,900
Discontinued operations, net	39,433		37,861		45,716		70,078
Net income	76,875		86,208		134,329		118,018
Less: Preferred stock dividends	16,719		17,353		35,926		26,033
Less: Preferred stock redemption charge	6,242		0		6,242		0
Less: Net income (loss) attributable to noncontrolling interests	(821)	[1]	(992)	[1]	(1,876)	[1]	(1,234)	[1]
Net income (loss) attributable to common stockholders	54,735		69,847		94,037		93,219
Average number of common shares outstanding:
Basic	213,498		176,445		206,612		165,755
Diluted	215,138		177,488		208,237		166,458
Basic:
Income (loss ) from continuing operations attributable to common stockholders	$ 0.07		$ 0.18		$ 0.23		$ 0.14
Discontinued operations, net	$ 0.18		$ 0.21		$ 0.22		$ 0.42
Net income (loss) attributable to common stockholders	$ 0.26	[2]	$ 0.40	[2]	$ 0.46	[2]	$ 0.56	[2]
Diluted:
Income (loss) from continuing operations attributable to common stockholders	$ 0.07		$ 0.18		$ 0.23		$ 0.14
Discontinued operations, net	$ 0.18		$ 0.21		$ 0.22		$ 0.42
Net income (loss) attributable to common stockholders	$ 0.25	[2]	$ 0.39	[2]	$ 0.45	[2]	$ 0.56	[2]
Dividends declared and paid per common share	$ 0.74		$ 0.715		$ 1.48		$ 1.405
Total comprehensive income (loss) attributable to stockholders	$ 74,927		$ 86,358		$ 132,667		$ 118,972

[1] Includes amounts attributable to redeemable noncontrolling interests.

[2] Amounts may not sum due to rounding