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Significant Accounting Policies - Narrative (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) segment	Jun. 30, 2018 USD ($)	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)
Significant Accounting Policies Statement [Line Items]
Property impairment charges	$ 0	$ 0	$ 0	$ 0
Amortization of above and below-market leases	1,000,000.0	900,000	$ 1,900,000	1,800,000
Remaining weighted average lease term related to these intangible assets and liabilities			8 years 4 months 24 days
Straight-line rent and accounts receivables, net of allowances	25,800,000		$ 25,800,000			$ 25,700,000
Straight-line rent and accounts receivable, allowances	300,000		300,000			200,000
Deferred financing cost accumulated amortization	7,500,000		$ 7,500,000			$ 6,900,000
Performance measurement period			3 years
Lease liability	800,000		$ 800,000		$ 900,000
Right-of-use asset	700,000		$ 700,000		$ 800,000
Weighted average remaining lease term					3 years 6 months
Incremental borrowing rate					2.70%
Real estate investment
Significant Accounting Policies Statement [Line Items]
Number of reportable segments | segment			1
Senior Secured Loan Receivable
Significant Accounting Policies Statement [Line Items]
Impairment charges	$ 0	$ 0	$ 0	$ 0

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