Significant Accounting Policies - Narrative (Details)	3 Months Ended
	Mar. 31, 2020 USD ($) property	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Significant Accounting Policies Statement [Line Items]
Amortization of above and below-market leases	$ 1,400,000	$ 900,000
Remaining average lease term related to intangible assets and liabilities	8 years 3 months 18 days
Straight-line rent and accounts receivables, net of allowances	$ 27,300,000		$ 27,400,000
Straight-line rent and accounts receivable, allowances	500,000		200,000
Deferred financing cost accumulated amortization	$ 8,600,000		$ 8,300,000
Performance measurement period	3 years
Number of reportable segments | property	1
COVID-19
Significant Accounting Policies Statement [Line Items]
Straight line rent and accounts receivable, provision for losses	$ 500,000
Real estate investment
Significant Accounting Policies Statement [Line Items]
Property impairment charges	0	0
Senior Secured Loan Receivable
Significant Accounting Policies Statement [Line Items]
Impairment charges	$ 0	$ 0