CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Rental income:
Triple-net leased	$ 210,424	$ 201,028	$ 635,030	$ 571,591
Office	158,273	142,755	446,496	420,287
Total rental income	368,697	343,783	1,081,526	991,878
Resident fees and services	461,974	454,825	1,390,387	1,356,384
Office building and other services revenue	4,317	10,000	17,006	29,951
Income from loans and investments	31,566	18,924	78,098	66,192
Interest and other income	562	74	792	719
Total revenues	867,116	827,606	2,567,809	2,445,124
Expenses:
Interest	105,063	97,135	312,001	263,422
Depreciation and amortization	208,387	226,332	666,735	657,262
Property-level operating expenses:
Senior living	312,145	304,540	932,675	902,154
Office	48,972	43,305	136,619	129,152
Total property-level operating expenses	361,117	347,845	1,069,294	1,031,306
Office building services costs	974	6,416	6,277	19,098
General, administrative and professional fees	31,567	32,114	95,387	100,399
Loss on extinguishment of debt, net	383	15,331	3,165	14,897
Merger-related expenses and deal costs	16,217	62,145	25,073	105,023
Other	2,430	4,795	8,901	13,948
Total expenses	726,138	792,113	2,186,833	2,205,355
Income before unconsolidated entities, income taxes, discontinued operations, real estate dispositions and noncontrolling interest	140,978	35,493	380,976	239,769
Income (loss) from unconsolidated entities	931	(955)	2,151	(1,197)
Income tax benefit	8,537	10,697	28,507	27,736
Income from continuing operations	150,446	45,235	411,634	266,308
Discontinued operations	(118)	(22,383)	(755)	13,434
Gain on real estate dispositions	(144)	265	31,779	14,420
Net income	150,184	23,117	442,658	294,162
Net income attributable to noncontrolling interest	732	265	1,064	1,047
Net income attributable to common stockholders	$ 149,452	$ 22,852	$ 441,594	$ 293,115
Basic:
Income from continuing operations attributable to common stockholders, including real estate dispositions (in usd per share)	$ 0.43	$ 0.14	$ 1.29	$ 0.85
Discontinued operations (in usd per share)	0.00	(0.07)	0.00	0.04
Net income attributable to common stockholders (in usd per share)	0.43	0.07	1.29	0.89
Diluted:
Income from continuing operations attributable to common stockholders, including real estate dispositions (in usd per share)	0.42	0.14	1.28	0.84
Discontinued operations (in usd per share)	0.00	(0.07)	0.00	0.04
Net income attributable to common stockholders (in usd per share)	$ 0.42	$ 0.07	$ 1.28	$ 0.88
Weighted average shares used in computing earnings per common share:
Basic (in shares)	350,274	332,491	341,610	329,440
Diluted (in shares)	354,186	336,338	345,352	333,210
Dividends declared per common share (in usd per share)	$ 0.73	$ 0.73	$ 2.19	$ 2.31