Real Estate Investments and Equity Method Investments - Summary of the Purchase Price Allocation (Details) - USD ($) $ in Thousands		12 Months Ended
	Jul. 25, 2017	Dec. 31, 2019	Dec. 31, 2018
Wendover Village
Business Acquisition [Line Items]
Land		$ 1,633
Below-market leases		0
Finance lease liabilities		0
Finance lease right-of-use assets		0
Net assets acquired		2,783
One City Center
Business Acquisition [Line Items]
Land		2,678
Below-market leases		0
Finance lease liabilities		0
Finance lease right-of-use assets		0
Net assets acquired		46,020
1405 Point
Business Acquisition [Line Items]
Land		0
Below-market leases		0
Finance lease liabilities		(8,671)
Finance lease right-of-use assets		11,730
Net assets acquired		101,896
Red Mill Commons
Business Acquisition [Line Items]
Land		44,252
Below-market leases		(6,221)
Finance lease liabilities		0
Finance lease right-of-use assets		0
Net assets acquired		79,815
Marketplace at Hilltop
Business Acquisition [Line Items]
Land		2,023
Below-market leases		(1,136)
Finance lease liabilities		(9,200)
Finance lease right-of-use assets		12,770
Net assets acquired		29,507
Thames Street Wharf
Business Acquisition [Line Items]
Land		15,861
Below-market leases		(3,636)
Finance lease liabilities		0
Finance lease right-of-use assets		0
Net assets acquired		101,299
Indian Lakes Crossing
Business Acquisition [Line Items]
Land			$ 10,926
Below-market leases			(175)
Net assets acquired			14,854
Parkway Centre
Business Acquisition [Line Items]
Land			1,372
Below-market leases			(10)
Net assets acquired			11,572
Lexington Square
Business Acquisition [Line Items]
Land			3,036
Below-market leases			(447)
Net assets acquired			24,574
Wendover Village Ourparcel Phase
Business Acquisition [Line Items]
Land	$ 5,550
Below-market leases	(50)
Net assets acquired	14,418
Site improvements | Wendover Village
Business Acquisition [Line Items]
Property, plant, and equipment		50
Site improvements | One City Center
Business Acquisition [Line Items]
Property, plant, and equipment		163
Site improvements | 1405 Point
Business Acquisition [Line Items]
Property, plant, and equipment		298
Site improvements | Red Mill Commons
Business Acquisition [Line Items]
Property, plant, and equipment		2,558
Site improvements | Marketplace at Hilltop
Business Acquisition [Line Items]
Property, plant, and equipment		691
Site improvements | Thames Street Wharf
Business Acquisition [Line Items]
Property, plant, and equipment		150
Site improvements | Indian Lakes Crossing
Business Acquisition [Line Items]
Property, plant, and equipment			531
Site improvements | Parkway Centre
Business Acquisition [Line Items]
Property, plant, and equipment			696
Site improvements | Lexington Square
Business Acquisition [Line Items]
Property, plant, and equipment			7,396
Site improvements | Wendover Village Ourparcel Phase
Business Acquisition [Line Items]
Property, plant, and equipment	232
Building and improvements | Wendover Village
Business Acquisition [Line Items]
Property, plant, and equipment		888
Building and improvements | One City Center
Business Acquisition [Line Items]
Property, plant, and equipment		28,039
Building and improvements | 1405 Point
Business Acquisition [Line Items]
Property, plant, and equipment		92,866
Building and improvements | Red Mill Commons
Business Acquisition [Line Items]
Property, plant, and equipment		27,790
Building and improvements | Marketplace at Hilltop
Business Acquisition [Line Items]
Property, plant, and equipment		19,195
Building and improvements | Thames Street Wharf
Business Acquisition [Line Items]
Property, plant, and equipment		64,539
Building and improvements | Indian Lakes Crossing
Business Acquisition [Line Items]
Property, plant, and equipment			1,913
Building and improvements | Parkway Centre
Business Acquisition [Line Items]
Property, plant, and equipment			7,168
Building and improvements | Lexington Square
Business Acquisition [Line Items]
Property, plant, and equipment			10,387
Building and improvements | Wendover Village Ourparcel Phase
Business Acquisition [Line Items]
Property, plant, and equipment	6,977
Furniture and Fixtures | Wendover Village
Business Acquisition [Line Items]
Property, plant, and equipment		0
Furniture and Fixtures | One City Center
Business Acquisition [Line Items]
Property, plant, and equipment		0
Furniture and Fixtures | 1405 Point
Business Acquisition [Line Items]
Property, plant, and equipment		2,302
Furniture and Fixtures | Red Mill Commons
Business Acquisition [Line Items]
Property, plant, and equipment		0
Furniture and Fixtures | Marketplace at Hilltop
Business Acquisition [Line Items]
Property, plant, and equipment		0
Furniture and Fixtures | Thames Street Wharf
Business Acquisition [Line Items]
Property, plant, and equipment		0
In-place lease assets | Wendover Village
Business Acquisition [Line Items]
Finite-lived intangibles		101
In-place lease assets | One City Center
Business Acquisition [Line Items]
Finite-lived intangibles		15,140
In-place lease assets | 1405 Point
Business Acquisition [Line Items]
Finite-lived intangibles		3,371
In-place lease assets | Red Mill Commons
Business Acquisition [Line Items]
Finite-lived intangibles		9,973
In-place lease assets | Marketplace at Hilltop
Business Acquisition [Line Items]
Finite-lived intangibles		4,565
In-place lease assets | Thames Street Wharf
Business Acquisition [Line Items]
Finite-lived intangibles		24,385
In-place lease assets | Indian Lakes Crossing
Business Acquisition [Line Items]
Finite-lived intangibles			1,648
In-place lease assets | Parkway Centre
Business Acquisition [Line Items]
Finite-lived intangibles			2,346
In-place lease assets | Lexington Square
Business Acquisition [Line Items]
Finite-lived intangibles			4,113
In-place lease assets | Wendover Village Ourparcel Phase
Business Acquisition [Line Items]
Finite-lived intangibles	1,382
Above-market leases | Wendover Village
Business Acquisition [Line Items]
Finite-lived intangibles		111
Above-market leases | One City Center
Business Acquisition [Line Items]
Finite-lived intangibles		0
Above-market leases | 1405 Point
Business Acquisition [Line Items]
Finite-lived intangibles		0
Above-market leases | Red Mill Commons
Business Acquisition [Line Items]
Finite-lived intangibles		1,463
Above-market leases | Marketplace at Hilltop
Business Acquisition [Line Items]
Finite-lived intangibles		599
Above-market leases | Thames Street Wharf
Business Acquisition [Line Items]
Finite-lived intangibles		$ 0
Above-market leases | Indian Lakes Crossing
Business Acquisition [Line Items]
Finite-lived intangibles			11
Above-market leases | Parkway Centre
Business Acquisition [Line Items]
Finite-lived intangibles			0
Above-market leases | Lexington Square
Business Acquisition [Line Items]
Finite-lived intangibles			$ 89
Above-market leases | Wendover Village Ourparcel Phase
Business Acquisition [Line Items]
Finite-lived intangibles	$ 327