Real Estate Investments - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details) $ in Thousands	Sep. 30, 2016 USD ($)
Real Estate Properties
Land	$ 76,920
Site improvements	6,500
Building and improvements	118,649
In-place leases	27,760
Above-market leases	2,180
Below-market leases	(12,630)
Net assets acquired	219,379
Retail Portfolio
Real Estate Properties
Land	66,260
Site improvements	3,870
Building and improvements	88,820
In-place leases	20,630
Above-market leases	1,960
Below-market leases	(11,040)
Net assets acquired	170,500
Southgate Square
Real Estate Properties
Land	8,890
Site improvements	2,140
Building and improvements	23,810
In-place leases	5,990
Above-market leases	100
Below-market leases	(1,400)
Net assets acquired	39,530
Southshore Shops
Real Estate Properties
Land	1,770
Site improvements	490
Building and improvements	6,019
In-place leases	1,140
Above-market leases	120
Below-market leases	(190)
Net assets acquired	$ 9,349