Segment Disclosures (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 item	Sep. 30, 2012
Segment reporting information, revenues
Number of reportable segments			5
Resident Fees and Services	$ 37,589	$ 36,076	$ 112,070	$ 107,824
Interest Income	42,078	10,278	68,611	12,313
Investment Management Fee Income	464	460	1,406	1,423
Total revenues	543,958	468,066	1,563,292	1,370,999
NOI	424,847	384,675	1,268,293	1,147,229
Adjusted NOI (Cash NOI)	391,969	349,149	1,168,007	1,041,877
Operating segment
Segment reporting information, revenues
Rental Revenues	463,827	421,252	1,381,205	1,249,439
Resident Fees and Services	37,589	36,076	112,070	107,824
Interest Income	42,078	10,278	68,611	12,313
Investment Management Fee Income	464	460	1,406	1,423
Total revenues	543,958	468,066	1,563,292	1,370,999
NOI	424,847	384,675	1,268,293	1,147,229
Adjusted NOI (Cash NOI)	391,969	349,149	1,168,007	1,041,877
Operating segment \| Senior housing
Segment reporting information, revenues
Rental Revenues	149,443	114,661	448,600	341,353
Resident Fees and Services	37,589	36,076	112,070	107,824
Interest Income	3,121	877	8,328	1,686
Total revenues	190,153	151,614	568,998	450,863
NOI	162,391	125,865	487,501	379,251
Adjusted NOI (Cash NOI)	148,997	113,401	440,395	341,794
Operating segment \| Post-acute/skilled
Segment reporting information, revenues
Rental Revenues	138,289	135,183	411,912	403,209
Interest Income	38,642	9,135	59,656	9,842
Total revenues	176,931	144,318	471,568	413,051
NOI	137,642	135,029	409,965	402,690
Adjusted NOI (Cash NOI)	120,258	116,573	356,544	345,936
Operating segment \| Life science
Segment reporting information, revenues
Rental Revenues	72,531	71,194	221,088	215,569
Investment Management Fee Income	1	1	3	3
Total revenues	72,532	71,195	221,091	215,572
NOI	58,440	59,403	179,775	177,339
Adjusted NOI (Cash NOI)	56,352	56,341	170,957	171,179
Operating segment \| Medical office
Segment reporting information, revenues
Rental Revenues	88,473	85,800	265,902	246,661
Investment Management Fee Income	463	459	1,403	1,420
Total revenues	88,936	86,259	267,305	248,081
NOI	52,255	50,852	160,170	148,030
Adjusted NOI (Cash NOI)	52,214	49,669	157,742	144,272
Operating segment \| Hospital
Segment reporting information, revenues
Rental Revenues	15,091	14,414	33,703	42,647
Interest Income	315	266	627	785
Total revenues	15,406	14,680	34,330	43,432
NOI	14,119	13,526	30,882	39,919
Adjusted NOI (Cash NOI)	$ 14,148	$ 13,165	$ 42,369	$ 38,696

- Definition

NOI is a non-GAAP supplemental financial measure used to evaluate the operating performance of real estate. The Company defines NOI as rental revenues, including tenant recoveries, resident fees and services, and income from direct financing leases, less property level operating expenses. NOI excludes interest income, investment management fee income, depreciation and amortization, interest expense, general and administrative expenses, impairments, impairment recoveries, other income, net, income taxes, equity income from and impairments of investments in unconsolidated joint ventures, and discontinued operations. The Company believes NOI provides relevant and useful information because it reflects only income and operating expense items that are incurred at the property level and presents them on an unleveraged basis. The Company uses NOI to make decisions about resource allocations and to assess and compare property level performance. The Company believes that net income is the most directly comparable GAAP measure to NOI. NOI should not be viewed as an alternative measure of operating performance to net income as defined by GAAP because it does not reflect the aforementioned excluded items. Further, the Company's definition of NOI may not be comparable to the definition used by other REITs, as those companies may use different methodologies for calculating NOI.

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