Acquired Properties - Summary of Retail Properties Acquired (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) ft²	Sep. 30, 2018 USD ($) ft²	Sep. 30, 2019 USD ($) ft²	Sep. 30, 2018 USD ($) ft²
Real Estate Properties [Line Items]
Capitalized acquisition costs	$ 1,416	$ 60	$ 2,334	$ 260
Retail
Real Estate Properties [Line Items]
Gross Acquisition Price			$ 365,764	$ 159,800
Square Feet | ft²	977,400	250,000	977,400	250,000
Commons at University Place | Retail
Real Estate Properties [Line Items]
Gross Acquisition Price			$ 23,250
Square Feet | ft²	92,000		92,000
Lakeside Winter Park and Lakeside Crossings | Retail
Real Estate Properties [Line Items]
Gross Acquisition Price			$ 63,500
Square Feet | ft²	76,000		76,000
Scofield Crossing | Retail
Real Estate Properties [Line Items]
Gross Acquisition Price			$ 3,000
Square Feet | ft²	64,000		64,000
Tomball Town Center Kroger | Retail
Real Estate Properties [Line Items]
Gross Acquisition Price			$ 13,992
Square Feet | ft²	74,000		74,000
Sandy Plains Outparcel | Retail
Real Estate Properties [Line Items]
Gross Acquisition Price			$ 2,900
Square Feet | ft²	6,000		6,000
Shoppes at Fairview | Retail
Real Estate Properties [Line Items]
Gross Acquisition Price			$ 36,000
Square Feet | ft²	67,500		67,500
Southern Palm Crossing | Retail
Real Estate Properties [Line Items]
Gross Acquisition Price			$ 96,750
Square Feet | ft²	346,200		346,200
Travilah Square | Retail
Real Estate Properties [Line Items]
Gross Acquisition Price			$ 52,272
Square Feet | ft²	58,300		58,300
Eldorado Marketplace | Retail
Real Estate Properties [Line Items]
Gross Acquisition Price			$ 70,850
Square Feet | ft²	189,500		189,500
Garden Village Outparcel | Retail
Real Estate Properties [Line Items]
Gross Acquisition Price			$ 3,250
Square Feet | ft²	3,900		3,900
PGA Plaza, Miami-Fort Lauderdale-West Palm Beach, FL | Retail
Real Estate Properties [Line Items]
Gross Acquisition Price				$ 88,000
Square Feet | ft²		120,000		120,000
Kennesaw Marketplace, Atlanta-Sandy Springs-Roswell, GA | Retail
Real Estate Properties [Line Items]
Gross Acquisition Price				$ 64,300
Square Feet | ft²		117,000		117,000
Kennesaw Marketplace, Phase 3 | Retail
Real Estate Properties [Line Items]
Gross Acquisition Price				$ 7,500
Square Feet | ft²		13,000		13,000