Consolidated Statements of Comprehensive Income (Unaudited) (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:
Rental income	$ 290,225		$ 235,938		$ 826,627		$ 615,219
Resident fees and services	174,464		125,125		498,295		319,559
Interest income	8,111		7,858		24,131		32,433
Other income	1,339		1,809		4,505		9,974
Total revenues	474,139		370,730		1,353,558		977,185
Expenses:
Interest expense	94,580		84,429		280,058		220,527
Property operating expenses	144,479		103,127		409,606		266,081
Depreciation and amortization	132,150		111,582		387,053		286,623
General and administrative	23,679		19,735		77,302		57,009
Transaction costs	8,264		6,739		42,535		56,542
Loss (gain) on derivatives, net	409		0		(1,712)		0
Loss (gain) on extinguishment of debt, net	215		0		791		0
Provision for loan losses	27,008		132		27,008		547
Total expenses	430,784		325,744		1,222,641		887,329
Income (loss) from continuing operations before income taxes and income from unconsolidated entities	43,355		44,986		130,917		89,856
Income tax (expense) benefit	(836)		(223)		(3,754)		(563)
Income from unconsolidated entities	(739)		1,642		2,250		4,156
Income (loss) from continuing operations	41,780		46,405		129,413		93,449
Discontinued operations:
Gain (loss) on sales of properties, net	12,827		185		46,046		56,565
Impairment of assets	(6,952)		0		(6,952)		(202)
Income (loss) from discontinued operations, net	5,851		5,763		19,329		20,561
Discontinued operations, net	11,726		5,948		58,423		76,924
Net income	53,506		52,353		187,836		170,373
Less: Preferred stock dividends	16,602		17,234		52,527		43,268
Less: Preferred stock redemption charge	0		0		6,242		0
Less: Net income (loss) attributable to noncontrolling interests	(365)	[1]	(1,488)	[1]	(2,241)	[1]	(2,721)	[1]
Net income (loss) attributable to common stockholders	37,269		36,607		131,308		129,826
Average number of common shares outstanding:
Basic	224,391		177,272		212,592		169,636
Diluted	226,258		177,849		214,075		170,301
Basic:
Income (loss ) from continuing operations attributable to common stockholders	$ 0.11		$ 0.17		$ 0.34		$ 0.31
Discontinued operations, net	$ 0.05		$ 0.03		$ 0.27		$ 0.45
Net income (loss) attributable to common stockholders	$ 0.17	[2]	$ 0.21	[2]	$ 0.62	[2]	$ 0.77	[2]
Diluted:
Income (loss) from continuing operations attributable to common stockholders	$ 0.11		$ 0.17		$ 0.34		$ 0.31
Discontinued operations, net	$ 0.05		$ 0.03		$ 0.27		$ 0.45
Net income (loss) attributable to common stockholders	$ 0.16	[2]	$ 0.21	[2]	$ 0.61	[2]	$ 0.76	[2]
Dividends declared and paid per common share	$ 0.74		$ 0.715		$ 2.22		$ 2.12
Total comprehensive income (loss) attributable to stockholders	$ 56,664		$ 52,144		$ 189,332		$ 171,118

[1] Includes amounts attributable to redeemable noncontrolling interests.

[2] Amounts may not sum due to rounding