Dispositions of Real Estate and Discontinued Operations (Details) $ in Thousands		6 Months Ended
	Jul. 16, 2015 USD ($)	Jun. 30, 2015 USD ($) property	Jun. 30, 2014 USD ($) item
Operating income from discontinued operations
Rental and related revenues			$ 1,810
Operating expenses			54
Other expenses, net			20
Income before gain on sales of real estate, net of income taxes			1,736
Gain on sales of real estate, net of income taxes			$ 28,010
Number of properties included in discontinued operations | item			2
Senior housing
Dispositions of Real Estate and Land
Number of properties disposed | property		9
Total consideration for disposition of real estate		$ 60,000
Post-acute/skilled
Dispositions of Real Estate and Land
Number of properties disposed | item			2
Total consideration for disposition of real estate			$ 22,000
Life science | Subsequent event
Dispositions of Real Estate and Land
Total consideration for disposition of real estate	$ 11,000
Hospital
Dispositions of Real Estate and Land
Total consideration for disposition of real estate			17,000
Medical office
Dispositions of Real Estate and Land
Total consideration for disposition of real estate			$ 145