Real Estate Property Investments - Schedule of Real Estate Acquisitions (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Real estate acquisitions
Consideration, Cash Paid/Debt Settled	$ 135,816	$ 257,242
Consideration, Liabilities assumed	3,678	78,131
Assets Acquired, Real Estate	135,609	313,422
Assets Acquired, Net Intangibles	3,885	21,951
Senior housing triple-net
Real estate acquisitions
Consideration, Cash Paid/Debt Settled		76,362
Consideration, Liabilities assumed		1,200
Assets Acquired, Real Estate		71,875
Assets Acquired, Net Intangibles		5,687
SHOP
Real estate acquisitions
Consideration, Cash Paid/Debt Settled		113,971
Consideration, Liabilities assumed		76,931
Assets Acquired, Real Estate		177,551
Assets Acquired, Net Intangibles		13,351
Life science
Real estate acquisitions
Consideration, Cash Paid/Debt Settled	87,467	49,000
Consideration, Liabilities assumed	2,841	0
Assets Acquired, Real Estate	91,208	47,400
Assets Acquired, Net Intangibles	(900)	1,600
Medical office
Real estate acquisitions
Consideration, Cash Paid/Debt Settled	48,349
Consideration, Liabilities assumed	837
Assets Acquired, Real Estate	44,401
Assets Acquired, Net Intangibles	$ 4,785
Other non-reportable segments
Real estate acquisitions
Consideration, Cash Paid/Debt Settled		17,909
Consideration, Liabilities assumed		0
Assets Acquired, Real Estate		16,596
Assets Acquired, Net Intangibles		$ 1,313