Significant Accounting Policies - Narrative (Details)	3 Months Ended
	Mar. 31, 2021 USD ($) segment	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Significant Accounting Policies Statement
Amortization of above and below-market leases	$ 1,400,000	$ 1,400,000
Remaining weighted average lease term related to these intangible assets and liabilities	7 years 6 months
Straight-line rent and accounts receivables, net of allowances	$ 34,300,000		$ 32,500,000
Straight-line rent and accounts receivable, allowances	1,300,000		900,000
Deferred financing cost accumulated amortization	$ 9,700,000		$ 9,400,000
Number of reportable segments | segment	1
COVID-19
Significant Accounting Policies Statement
Decrease in straight-line rent and accounts receivable, net of allowances COVID-19	$ 100,000	500,000
Real estate investment
Significant Accounting Policies Statement
Property impairment charges	$ 0	$ 0