Acquired Properties - Summary of Retail Properties Acquired (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) ft²	Jun. 30, 2019 USD ($) ft²	Jun. 30, 2020 USD ($) ft²	Jun. 30, 2019 USD ($) ft²
Real Estate Properties [Line Items]
Capitalized acquisition costs	$ 63	$ 310	$ 63	$ 918
Wholly-Owned Retail Properties
Real Estate Properties [Line Items]
Gross Acquisition Price			$ 33,204	$ 142,642
Square Feet | ft²	173,100	379,500	173,100	379,500
Trowbridge Crossing | Wholly-Owned Retail Properties
Real Estate Properties [Line Items]
Gross Acquisition Price			$ 10,950
Square Feet | ft²	62,600		62,600
Antoine Town Center | Wholly-Owned Retail Properties
Real Estate Properties [Line Items]
Gross Acquisition Price			$ 22,254
Square Feet | ft²	110,500		110,500
Commons at University Place | Wholly-Owned Retail Properties
Real Estate Properties [Line Items]
Gross Acquisition Price				$ 23,250
Square Feet | ft²		92,000		92,000
Lakeside Winter Park and Lakeside Crossings | Wholly-Owned Retail Properties
Real Estate Properties [Line Items]
Gross Acquisition Price				$ 63,500
Square Feet | ft²		76,000		76,000
Scofield Crossing | Wholly-Owned Retail Properties
Real Estate Properties [Line Items]
Gross Acquisition Price				$ 3,000
Square Feet | ft²		64,000		64,000
Tomball Town Center Kroger | Wholly-Owned Retail Properties
Real Estate Properties [Line Items]
Gross Acquisition Price				$ 13,992
Square Feet | ft²		74,000		74,000
Sandy Plains Outparcel | Wholly-Owned Retail Properties
Real Estate Properties [Line Items]
Gross Acquisition Price				$ 2,900
Square Feet | ft²		6,000		6,000
Shops at Fairview Town Center | Wholly-Owned Retail Properties
Real Estate Properties [Line Items]
Gross Acquisition Price				$ 36,000
Square Feet | ft²		67,500		67,500