CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Rental income:
Triple-net leased	$ 212,370	$ 210,424	$ 634,955	$ 635,030
Office	189,506	158,273	561,641	446,496
Total rental income	401,876	368,697	1,196,596	1,081,526
Resident fees and services	461,700	461,974	1,386,131	1,390,387
Office building and other services revenue	3,196	4,317	9,781	17,006
Income from loans and investments	32,985	31,566	85,499	78,098
Interest and other income	171	562	854	792
Total revenues	899,928	867,116	2,678,861	2,567,809
Expenses
Interest	113,869	105,063	336,245	312,001
Depreciation and amortization	213,407	208,387	655,298	666,735
Property-level operating expenses:
Senior living	315,598	312,145	936,296	932,675
Office	60,609	48,972	174,728	136,619
Total property-level operating expenses	376,207	361,117	1,111,024	1,069,294
Office building services costs	418	974	1,708	6,277
General, administrative and professional fees	33,317	31,567	100,560	95,387
Loss on extinguishment of debt, net	511	383	856	3,165
Merger-related expenses and deal costs	804	16,217	8,903	25,073
Other	13,030	2,430	16,066	8,901
Total expenses	751,563	726,138	2,230,660	2,186,833
Income before unconsolidated entities, income taxes, discontinued operations, real estate dispositions and noncontrolling interests	148,365	140,978	448,201	380,976
Income (loss) from unconsolidated entities	750	931	3,794	2,151
Income tax benefit	7,815	8,537	13,119	28,507
Income from continuing operations	156,930	150,446	465,114	411,634
Discontinued operations	(19)	(118)	(95)	(755)
Gain (loss) on real estate dispositions	458,280	(144)	502,288	31,779
Net income	615,191	150,184	967,307	442,658
Net income attributable to noncontrolling interests	1,233	732	3,391	1,064
Net income attributable to common stockholders	$ 613,958	$ 149,452	$ 963,916	$ 441,594
Basic:
Income from continuing operations (in usd per share)	$ 0.44	$ 0.43	$ 1.31	$ 1.20
Net income attributable to common stockholders (in usd per share)	1.72	0.43	2.71	1.29
Diluted:
Income from continuing operations (in usd per share)	0.44	0.42	1.30	1.19
Net income attributable to common stockholders (in usd per share)	$ 1.71	$ 0.42	$ 2.69	$ 1.28
Weighted average shares used in computing earnings per common share:
Basic (in shares)	355,929	350,274	355,110	341,610
Diluted (in shares)	359,333	354,186	358,365	345,352
Dividends declared per common share (in usd per share)	$ 0.775	$ 0.73	$ 2.325	$ 2.19