Related Party Transactions - Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($) property	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) property	Jun. 30, 2018 USD ($)
Related Party Transaction [Line Items]
Related party expense	$ 333	$ 317	$ 666	$ 634
Related party - general and administrative	155	160	297	306
Real Property Management Real Estate Brokerage And Construction Supervision Services | Majestic Property Management Corporation
Related Party Transaction [Line Items]
Related party expense	8	6	16	16
Shared Services Agreement | Gould Investors Limited Partnership
Related Party Transaction [Line Items]
Related party - general and administrative	155	160	297	307
Affiliated Entity
Related Party Transaction [Line Items]
Related party expense	$ 1,090	926	$ 2,113	1,834
Number of investments | property	3		3
Affiliated Entity | Payment of Acquisition Fee
Related Party Transaction [Line Items]
Related party expense	$ 430	$ 513	$ 851	$ 1,813