Real Property Acquisitions and Development (Details 1) (USD $)	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Triple Net [Member]
Estimated Fair Value of Allocated Purchase Price of Asset and Liabilities
Land and land improvements	$ 70,002,000	[1]	$ 2,750,000
Buildings and improvements	537,014,000	[1]	30,693,000
Acquired lease intangibles	799,000
Receivables and other assets	7,000
Total assets acquired	607,822,000	[1]	33,443,000
Accrued expenses and other liabilities	(732,000)
Total liabilities assumed	(732,000)
Noncontrolling interests	0
Non-cash acquisition related activity	(357,000)	[1]	(657,000)
Cash disbursed for acquisitions	606,733,000	[1]	32,786,000
Construction in progress additions	45,360,000	[1]	24,657,000
Less: Capitalized Interest	(1,756,000)	[1]	(1,170,000)
Less: Foreign currency translation	(642,000)	[1]	(14,000)
Cash disbursed for construction in progress	42,962,000	[1]	23,473,000
Capital improvements to existing properties	11,557,000	[1]	5,877,000
Total cash invested in real property	661,252,000	[1]	62,136,000
Senior housing - operating [Member]
Estimated Fair Value of Allocated Purchase Price of Asset and Liabilities
Land and land improvements	86,184,000	[2]	2,100,000
Buildings and improvements	1,016,426,000	[2]	19,069,000
Acquired lease intangibles	62,838,000	[2]	1,331,000
Acquired Construction in Progress	0	[2]
Restricted cash	3,820,000	[2]	0
Receivables and other assets	23,014,000	[2]	0
Total assets acquired	1,192,282,000	[2],[3]	22,500,000	[3]
Secured debt	(208,960,000)	[2]	0
Accrued expenses and other liabilities	(16,164,000)	[2]	(245,000)
Total liabilities assumed	(225,124,000)	[2]	(245,000)
Noncontrolling interests	(83,194,000)	[2]	0
Non-cash acquisition related activity	0	[2]	0
Cash disbursed for acquisitions	883,964,000	[2]	22,255,000
Construction in progress additions	4,193,000	[2]	1,026,000
Less: Capitalized Interest	(394,000)	[2]	(50,000)
Less: Foreign currency translation	(1,472,000)	[2]
Cash disbursed for construction in progress	2,327,000	[2]	976,000
Capital improvements to existing properties	11,632,000	[2]	13,998,000
Total cash invested in real property	897,923,000	[2]	37,229,000
Cash Acquired from Acquisition	1,677,000,000		8,476,000
Senior housing - operating [Member] | Preliminary [Member]
Estimated Fair Value of Allocated Purchase Price of Asset and Liabilities
Total cash invested in real property	885,642,000,000
Outpatient Medical [Member]
Estimated Fair Value of Allocated Purchase Price of Asset and Liabilities
Land and land improvements	0	[4]	0
Buildings and improvements	9,786,000	[4]	0
Acquired lease intangibles	511,000	[4]	0
Restricted cash			0
Receivables and other assets			0
Total assets acquired	10,297,000	[4]	0
Secured debt			0
Accrued expenses and other liabilities			0
Total liabilities assumed			0
Non-cash acquisition related activity			0
Cash disbursed for acquisitions	10,297,000	[4]	0
Construction in progress additions	16,421,000	[4]	38,237,000
Less: Capitalized Interest	(237,000)	[4]	(385,000)
Less: Accruals	(1,921,000)	[4],[5]	(9,584,000)	[5]
Cash disbursed for construction in progress	14,263,000	[4]	28,268,000
Capital improvements to existing properties	6,639,000	[4]	7,531,000
Total cash invested in real property	31,199,000	[4]	35,799,000
Outpatient Medical [Member] | Preliminary [Member]
Estimated Fair Value of Allocated Purchase Price of Asset and Liabilities
Total cash invested in real property	$ 10,297,000

[1] (1) Includes acquisitions with an aggregate purchase price of $571,586,000 for which the allocation of the purchase price consideration is preliminary and subject to change.

[2] (1) Includes acquisitions with an aggregate purchase price of $885,642,000 for which the allocation of the purchase price consideration is preliminary and subject to change.

[3] (2) Excludes $1,677,000 and $245,000 of cash acquired during the three months ended March 31, 2015 and 2014, respectively.

[4] (1) Includes acquisitions with an aggregate purchase price of $10,297,000 for which the allocation of the purchase price consideration is preliminary and subject to change.

[5] (2) Represents non-cash consideration accruals for amounts to be paid in future periods relating to properties that converted in the periods noted above.