Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Revenues:
Rental income	$ 302,465		$ 263,704		$ 598,753		$ 512,662
Resident fees and services	370,995		165,654		698,319		323,828
Interest income	7,640		7,879		16,696		16,020
Other income	1,025		1,482		1,725		3,166
Total revenues	682,125		438,719		1,315,493		855,676
Expenses:
Interest expense	110,629		91,299		220,585		179,780
Property operating expenses	278,587		135,839		531,941		264,641
Depreciation and amortization	200,108		127,599		386,837		248,136
General and administrative	23,902		25,870		51,081		53,621
Transaction costs	28,136		28,691		94,116		34,270
Loss (gain) on derivatives, net	(2,716)		(2,676)		(407)		(2,121)
Loss (gain) on extinguishment of debt, net	0		576		(308)		576
Provision for loan losses					0		0
Total expenses	638,646		407,198		1,283,845		778,903
Income (loss) from continuing operations before income taxes and income from unconsolidated entities	43,479		31,521		31,648		76,773
Income tax (expense) benefit	(1,215)		(1,447)		(3,978)		(2,918)
Income from unconsolidated entities	(5,461)		1,456		(3,198)		2,989
Income (loss) from continuing operations	36,803		31,530		24,472		76,844
Discontinued operations:
Gain (loss) on sales of properties, net	(29,997)		32,450		52,495		33,219
Income (loss) from discontinued operations, net	375		12,895		2,013		24,266
Discontinued operations, net	(29,622)		45,345		54,508		57,485
Net income	7,181		76,875		78,980		134,329
Less: Preferred stock dividends	16,602		16,719		33,203		35,926
Less: Preferred stock redemption charge	0		6,242		0		6,242
Less: Net income (loss) attributable to noncontrolling interests	(913)	[1]	(821)	[1]	(774)	[1]	(1,876)	[1]
Net income (loss) attributable to common stockholders	$ (8,508)		$ 54,735		$ 46,551		$ 94,037
Average number of common shares outstanding:
Basic	273,091		213,498		266,602		206,612
Diluted	276,481		215,138		266,602		208,237
Basic:
Income (loss ) from continuing operations attributable to common stockholders	$ 0.08		$ 0.04		$ (0.03)		$ 0.18
Discontinued operations, net	$ (0.11)		$ 0.21		$ 0.20		$ 0.28
Net income (loss) attributable to common stockholders	$ (0.03)	[2]	$ 0.26	[2]	$ 0.17	[2]	$ 0.46	[2]
Diluted:
Income (loss) from continuing operations attributable to common stockholders	$ 0.08		$ 0.04		$ (0.03)		$ 0.18
Discontinued operations, net	$ (0.11)		$ 0.21		$ 0.20		$ 0.28
Net income (loss) attributable to common stockholders	$ (0.03)	[2]	$ 0.25	[2]	$ 0.17	[2]	$ 0.45	[2]
Dividends declared and paid per common share	$ 0.765		$ 0.74		$ 1.53		$ 1.48

[1] Includes amounts attributable to redeemable noncontrolling interests.

[2] Amounts may not sum due to rounding