Organization and Basis of Presentation (Details)	Jun. 30, 2020 property subsidiary
Real Estate Properties [Line Items]
Number of real estate properties owned	105
Number of wholly-owned subsidiaries jointly elected to be treated as a TRS | subsidiary	1
Retail | Operating properties
Real Estate Properties [Line Items]
Number of real estate properties owned	102
COVID-19
Real Estate Properties [Line Items]
Tenants open for business (as a percent)	90.00%
Circle East | Redevelopment properties
Real Estate Properties [Line Items]
Number of real estate properties owned	1
One Loudoun Downtown - Pads G & H | Redevelopment properties
Real Estate Properties [Line Items]
Number of real estate properties owned	0
Carillon | Redevelopment properties
Real Estate Properties [Line Items]
Number of real estate properties owned	1
The Shoppes at Quarterfield | Redevelopment properties
Real Estate Properties [Line Items]
Number of real estate properties owned	1