CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Rental income:
Triple-net leased	$ 970,377	$ 877,276	$ 819,882
Medical office buildings	463,618	450,107	360,849
Total rental income	1,433,995	1,327,383	1,180,731
Resident fees and services	1,552,951	1,406,005	1,227,124
Medical office building and other services revenue	29,364	17,809	20,741
Income from loans and investments	55,169	58,208	39,913
Interest and other income	4,267	2,047	1,106
Total revenues	3,075,746	2,811,452	2,469,615
Expenses:
Interest	376,842	334,909	288,717
Depreciation and amortization	826,911	722,075	714,967
Property-level operating expenses:
Senior living	1,036,556	956,684	841,022
Medical office buildings	158,542	152,948	125,400
Total property-level operating expenses	1,195,098	1,109,632	966,422
Medical office building services costs	17,092	8,315	9,883
General, administrative and professional fees	121,746	115,106	98,510
Loss on extinguishment of debt, net	5,564	1,201	37,640
Merger-related expenses and deal costs	45,051	21,634	63,183
Other	38,925	18,732	6,940
Total expenses	2,627,229	2,331,604	2,186,262
Income before (loss) income from unconsolidated entities, income taxes, discontinued operations, real estate dispositions and noncontrolling interest	448,517	479,848	283,353
(Loss) income from unconsolidated entities	(139)	(508)	18,154
Income tax benefit	8,732	11,828	6,282
Income from continuing operations	457,110	491,168	307,789
Discontinued operations	2,106	(36,279)	53,986
Gain on real estate dispositions	17,970	0	0
Net income	477,186	454,889	361,775
Net income (loss) attributable to noncontrolling interest	1,419	1,380	(1,025)
Net income attributable to common stockholders	$ 475,767	$ 453,509	$ 362,800
Basic:
Income from continuing operations attributable to common stockholders (in dollars per share)	$ 1.61	$ 1.67	$ 1.06
Discontinued operations (in dollars per share)	$ 0.01	$ (0.12)	$ 0.18
Net income attributable to common stockholders (in dollars per share)	$ 1.62	$ 1.55	$ 1.24
Diluted:
Income from continuing operations attributable to common stockholders (in dollars per share)	$ 1.59	$ 1.66	$ 1.05
Discontinued operations (in dollars per share)	$ 0.01	$ (0.12)	$ 0.18
Net income attributable to common stockholders (in dollars per share)	$ 1.60	$ 1.54	$ 1.23
Weighted average shares used in computing earnings per common share:
Basic (in shares)	294,175	292,654	292,064
Diluted (in shares)	296,677	295,110	294,488