Mortgage Notes Payable, Net (Mortgage Notes) (Details) $ in Thousands	Mar. 31, 2020 USD ($) property	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Outstanding loan amount	$ 1,256,145
Effective Interest Rate	3.80%	4.14%
Mortgages
Debt Instrument [Line Items]
Encumbered Properties \| property	62
Outstanding loan amount	$ 551,205	$ 537,533
Effective Interest Rate	3.91%	3.90%
Deferred financing costs	$ (7,612)	$ (7,718)
Mortgage premiums and discounts, net	(1,516)	(1,531)
Mortgage notes payable, net	$ 542,077	528,284
Mortgages \| Capital One MOB Loan
Debt Instrument [Line Items]
Encumbered Properties \| property	35
Outstanding loan amount	$ 378,500	$ 378,500
Effective Interest Rate	3.66%	3.66%
Mortgages \| Multi-Property CMBS Loan
Debt Instrument [Line Items]
Encumbered Properties \| property	21
Outstanding loan amount	$ 118,700	$ 118,700
Effective Interest Rate	4.60%	4.60%
Mortgages \| Shiloh - Illinois (4)
Debt Instrument [Line Items]
Encumbered Properties \| property	1
Outstanding loan amount	$ 13,883	$ 0
Effective Interest Rate	4.34%	0.00%
Mortgages \| Palm Valley Medical Plaza - Goodyear, AZ
Debt Instrument [Line Items]
Encumbered Properties \| property	1
Outstanding loan amount	$ 3,084	$ 3,112
Effective Interest Rate	4.15%	4.15%
Mortgages \| Medical Center V - Peoria, AZ
Debt Instrument [Line Items]
Encumbered Properties \| property	1
Outstanding loan amount	$ 2,860	$ 2,884
Effective Interest Rate	4.75%	4.75%
Mortgages \| Fox Ridge Senior Living at Bryant - Bryant
Debt Instrument [Line Items]
Encumbered Properties \| property	1
Outstanding loan amount	$ 7,246	$ 7,283
Effective Interest Rate	3.98%	3.98%
Mortgages \| Fox Ridge Senior Living at Chenal - Little Rock
Debt Instrument [Line Items]
Encumbered Properties \| property	1
Outstanding loan amount	$ 16,620	$ 16,695
Effective Interest Rate	3.98%	3.98%
Mortgages \| Fox Ridge Senior Living at Parkstone - North Little Rock
Debt Instrument [Line Items]
Encumbered Properties \| property	1
Outstanding loan amount	$ 10,312	$ 10,359
Effective Interest Rate	3.98%	3.98%

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