CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Rental income:
Triple-net leased	$ 779,801	$ 674,547	$ 586,016
Medical office buildings	566,245	463,910	450,340
Total rental income	1,346,046	1,138,457	1,036,356
Resident fees and services	1,811,255	1,552,951	1,406,005
Medical office building and other services revenue	41,492	29,364	17,809
Income from loans and investments	86,553	51,778	54,425
Interest and other income	1,052	4,263	2,022
Total revenues	3,286,398	2,776,813	2,516,617
Expenses:
Interest	367,114	292,065	249,009
Depreciation and amortization	894,057	725,216	629,908
Property-level operating expenses:
Senior living	1,209,415	1,036,556	956,684
Medical office buildings	174,225	158,832	153,241
Total property-level operating expenses	1,383,640	1,195,388	1,109,925
Medical office building services costs	26,565	17,092	8,315
General, administrative and professional fees	128,035	121,738	115,083
Loss on extinguishment of debt, net	14,411	5,564	1,201
Merger-related expenses and deal costs	102,944	43,304	21,634
Other	17,957	25,743	17,364
Total expenses	2,934,723	2,426,110	2,152,439
Income before loss from unconsolidated entities, income taxes, discontinued operations, real estate dispositions and noncontrolling interest	351,675	350,703	364,178
Loss from unconsolidated entities	(1,420)	(139)	(508)
Income tax benefit	39,284	8,732	11,828
Income from continuing operations	389,539	359,296	375,498
Discontinued operations	11,103	99,735	79,171
Gain on real estate dispositions	18,580	17,970	0
Net income	419,222	477,001	454,669
Net income attributable to noncontrolling interest	1,379	1,234	1,160
Net income attributable to common stockholders	$ 417,843	$ 475,767	$ 453,509
Basic:
Income from continuing operations attributable to common stockholders (in dollars per share)	$ 1.23	$ 1.28	$ 1.28
Discontinued operations (in dollars per share)	0.03	0.34	0.27
Net income attributable to common stockholders (in dollars per share)	1.26	1.62	1.55
Diluted:
Income from continuing operations attributable to common stockholders (in dollars per share)	1.22	1.26	1.27
Discontinued operations (in dollars per share)	0.03	0.34	0.27
Net income attributable to common stockholders (in dollars per share)	$ 1.25	$ 1.60	$ 1.54
Weighted average shares used in computing earnings per common share:
Basic (in shares)	330,311	294,175	292,654
Diluted (in shares)	334,007	296,677	295,110