Significant Accounting Policies - Narrative (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) property	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Significant Accounting Policies Statement [Line Items]
Amortization of above and below-market leases	$ 1,300,000	$ 1,000,000.0	$ 2,700,000	$ 1,900,000
Remaining weighted average lease term related to these intangible assets and liabilities			8 years 1 month 6 days
Straight-line rent and accounts receivables, net of allowances	29,000,000.0		$ 29,000,000.0		$ 27,400,000
Straight-line rent and accounts receivable, allowances	1,100,000		1,100,000		200,000
Deferred financing cost accumulated amortization	(8,800,000)		$ (8,800,000)		$ (8,300,000)
Performance measurement period			3 years
Number of reportable segments | property			1
COVID-19
Significant Accounting Policies Statement [Line Items]
Decrease in straight-line rent and accounts receivable, net of allowances COVID-19	(400,000)		$ (900,000)
Senior Secured Loan Receivable
Significant Accounting Policies Statement [Line Items]
Impairment charges	0	0	0	0
Real estate investment
Significant Accounting Policies Statement [Line Items]
Property impairment charges	$ 0	$ 0	$ 0	$ 0