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Revenue Recognition - Disaggregation of Lease Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Minimum base rent	$ 32,390	$ 31,692	$ 94,997	$ 96,610
Lease income, net	53,965	51,489	154,869	143,491
Provision for uncollectible straight-line rent	(372)	(929)	(594)	(2,979)
Provision for uncollectible billed rent and recoveries	(51)	(1,220)	(1,633)	(8,178)
Real estate tax recoveries
Disaggregation of Revenue [Line Items]
Lease income, net	7,538	8,148	21,813	22,159
Common area maintenance, insurance, and other recoveries
Disaggregation of Revenue [Line Items]
Lease income, net	5,937	5,457	17,705	15,762
Ground rent income
Disaggregation of Revenue [Line Items]
Lease income, net	3,315	3,259	9,829	9,721
Above and below-market rent and lease inducement amortization, net
Disaggregation of Revenue [Line Items]
Lease income, net	1,019	2,915	3,404	5,763
Short-term and other lease income
Disaggregation of Revenue [Line Items]
Lease income, net	758	418	2,479	1,762
Termination fee income
Disaggregation of Revenue [Line Items]
Lease income, net	173	304	368	544
Straight-line rent adjustment, net
Disaggregation of Revenue [Line Items]
Lease income, net	1,005	1,258	2,496	1,940
Reversal of uncollectible billed rent and recoveries
Disaggregation of Revenue [Line Items]
Lease income, net	$ 2,253	$ 187	$ 4,005	$ 387

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Provision For Uncollectible Billed Rent And Recoveries

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Provision For Uncollectible Straight-line Rent

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Amount of lease income from operating, direct financing, and sales-type leases. Includes, but is not limited to, variable lease payments, interest income, profit (loss) recognized at commencement, and lease payments paid and payable to lessor.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=124258985&loc=SL77919372-209981

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Amount of operating lease income from lease payments paid and payable to lessor. Excludes variable lease payments not included in measurement of lease receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 50
-Paragraph 6A
-URI http://asc.fasb.org/extlink&oid=124502072&loc=SL77927221-108306

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=124258985&loc=SL77919372-209981

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