Real Estate Transactions - Construction, Tenant, and Other Capital Improvements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Real estate acquisitions [Line Items]
Funding for construction, tenant and other capital improvements	$ 759,720	$ 788,895	$ 677,274
Life Science
Real estate acquisitions [Line Items]
Funding for construction, tenant and other capital improvements	472,301	573,999	499,956
Medical Office
Real estate acquisitions [Line Items]
Funding for construction, tenant and other capital improvements	230,227	173,672	146,466
CCRC
Real estate acquisitions [Line Items]
Funding for construction, tenant and other capital improvements	57,192	41,224	0
Other
Real estate acquisitions [Line Items]
Funding for construction, tenant and other capital improvements	$ 0	$ 0	$ 30,852