Consolidated Statements of Income (Unaudited) (USD $)	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Revenues:
Rental income	$ 347,847,000		$ 298,873,000		$ 684,303,000		$ 591,516,000
Resident fees and services	467,639,000		370,995,000		923,904,000		698,319,000
Interest income	8,933,000		7,640,000		17,527,000		16,696,000
Other income	2,027,000		1,025,000		2,520,000		1,725,000
Total revenues	826,446,000		678,533,000		1,628,254,000		1,308,256,000
Expenses:
Interest expense	121,065,000		109,465,000		241,898,000		218,303,000
Property operating expenses	343,754,000		277,958,000		685,185,000		530,780,000
Depreciation and amortization	214,449,000		198,062,000		447,766,000		382,750,000
General and administrative	51,660,000		23,902,000		84,524,000		51,081,000
Transaction costs	7,040,000		28,136,000		7,993,000		94,116,000
Loss (gain) on derivatives, net	351,000		(2,716,000)		351,000		(407,000)
Loss (gain) on extinguishment of debt, net	531,000		0		383,000		(308,000)
Total expenses	738,850,000		634,807,000		1,468,100,000		1,276,315,000
Income (loss) from continuing operations before income taxes and income from unconsolidated entities, total	87,596,000		43,726,000		160,154,000		31,941,000
Income tax (expense) benefit	(1,569,000)		(1,215,000)		(3,830,000)		(3,978,000)
Income (loss) from unconsolidated entities	(11,516,000)		(5,461,000)		(17,073,000)		(3,198,000)
Income (loss) from continuing operations	74,511,000		37,050,000		139,251,000		24,765,000
Discontinued operations:
Gain (loss) on sales of discontinued properties, net	6,411,000		(29,997,000)		6,411,000		52,495,000
Income (loss) from discontinued operations, net	264,000		128,000		724,000		1,720,000
Discontinued operations, net	6,675,000		(29,869,000)		7,135,000		54,215,000
Gain (loss) on real estate dispositions, net	6,668,000		0		6,668,000		0
Net income	87,854,000		7,181,000		153,054,000		78,980,000
Less: Preferred stock dividends	16,352,000		16,602,000		32,705,000		33,203,000
Less: Net income (loss) attributable to noncontrolling interests	(327,000)	[1]	(913,000)	[1]	(1,502,000)	[1]	(774,000)	[1]
Net income (loss) attributable to common stockholders	$ 71,829,000		$ (8,508,000)		$ 121,851,000		$ 46,551,000
Average number of common shares outstanding:
Basic	296,256,000		273,091,000		293,046,000		266,602,000
Diluted	297,995,000		276,481,000		294,590,000		266,602,000
Basic:
Income (loss) from continuing operations attributable to common stockholders, including real estate dispositions	$ 0.22		$ 0.08		$ 0.39		$ (0.03)
Discontinued operations, net	$ 0.02		$ (0.11)		$ 0.02		$ 0.2
Net income (loss) attributable to common stockholders, total	$ 0.24		$ (0.03)		$ 0.42		$ 0.17
Diluted:
Income (loss) from continuing operations attributable to common stockholders, including real estate dispositions	$ 0.22		$ 0.08		$ 0.39		$ (0.03)
Discontinued operations, net	$ 0.02		$ (0.11)		$ 0.02		$ 0.2
Net income (loss) attributable to common stockholders, total	$ 0.24		$ (0.03)		$ 0.41		$ 0.17
Dividends declared and paid per common share	$ 0.795		$ 0.765		$ 1.59		$ 1.53

[1] (1) Includes amounts attributable to redeemable noncontrolling interests.