Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Revenues:
Rental income	$ 267,358		$ 159,937
Resident fees and services	158,174		71,286
Interest income	8,141		11,709
Other income	1,686		2,824
Total revenues	435,359		245,756
Expenses:
Interest expense	92,712		56,902
Property operating expenses	129,268		63,563
Depreciation and amortization	125,955		70,743
Transaction costs	5,579		36,065
General and administrative	27,751		17,714
Unrealized loss on derivatives	(555)		0
Loss (gain) on extinguishment of debt	0		0
Provision for loan losses	0		248
Total expenses	381,820		245,235
Income (loss) from continuing operations before income taxes and income from unconsolidated entities	53,539		521
Income tax (expense) benefit	(1,470)		(129)
Income from unconsolidated entities	1,532		1,543
Income (loss) from continuing operations	53,601		1,935
Discontinued operations:
Gain (loss) on sales of properties	769		26,156
Impairment of assets	0		(202)
Income (loss) from discontinued operations, net	3,088		3,921
Discontinued operations, net	3,857		29,875
Net income	57,458		31,810
Less: Preferred stock dividends	19,207		8,680
Less: Net income (loss) attributable to noncontrolling interests	(1,056)	[1]	(242)	[1]
Net income (loss) attributable to common stockholders	39,307		23,372
Average number of common shares outstanding:
Basic	199,661		154,945
Diluted	201,658		155,485
Basic:
Income (loss ) from continuing operations attributable to common stockholders	$ 0.18		$ (0.04)
Discontinued operations, net	$ 0.02		$ 0.19
Net income (loss) attributable to common stockholders	$ 0.20	[2]	$ 0.15	[2]
Diluted:
Income (loss) from continuing operations attributable to common stockholders	$ 0.18		$ (0.04)
Discontinued operations, net	$ 0.02		$ 0.19
Net income (loss) attributable to common stockholders	$ 0.19	[2]	$ 0.15	[2]
Dividends declared and paid per common share	$ 0.74		$ 0.69
Total comprehensive income (loss) attributable to common stockholders	$ 57,744		$ 32,614

[1] Includes amounts attributable to redeemable noncontrolling interests.

[2] Amounts may not sum due to rounding