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Real Estate Transactions - Construction, Tenant, and Other Capital Improvements (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
property
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Real estate acquisitions [Line Items]      
Funding for construction, tenant and other capital improvements $ 743,958 $ 607,186 $ 471,778
Senior housing triple-net      
Real estate acquisitions [Line Items]      
Funding for construction, tenant and other capital improvements 6,662 11,311 32,343
SHOP      
Real estate acquisitions [Line Items]      
Funding for construction, tenant and other capital improvements 90,874 53,389 49,473
Life science      
Real estate acquisitions [Line Items]      
Funding for construction, tenant and other capital improvements 499,956 396,431 240,901
Medical office      
Real estate acquisitions [Line Items]      
Funding for construction, tenant and other capital improvements $ 146,016 144,694 148,926
Number of properties to be developed | property 7    
Other non-reportable segments      
Real estate acquisitions [Line Items]      
Funding for construction, tenant and other capital improvements $ 450 $ 1,361 $ 135
On-campus      
Real estate acquisitions [Line Items]      
Number of properties to be developed | property 6