REAL ESTATE - Highest Tenant Industry Concentrations, Greater than 10% of Annual Base Rent (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($) tenant
Concentration Risk [Line Items]
Number of Tenants | tenant	80
Annualized Base Rent | $	$ 10,727
Percentage of Annualized Base Rent	50.00%
Legal Services
Concentration Risk [Line Items]
Number of Tenants | tenant	13
Annualized Base Rent | $	$ 4,547
Percentage of Annualized Base Rent	21.20%
Public Administration
Concentration Risk [Line Items]
Number of Tenants | tenant	6
Annualized Base Rent | $	$ 3,219
Percentage of Annualized Base Rent	15.00%
Professional, Scientific and Technical Services
Concentration Risk [Line Items]
Number of Tenants | tenant	11
Annualized Base Rent | $	$ 2,961
Percentage of Annualized Base Rent	13.80%