Organization (Details) $ in Thousands	3 Months Ended
Mar. 31, 2021 USD ($) ft² property joint_venture	Mar. 31, 2020 ft² property joint_venture	Dec. 31, 2020 USD ($)
Entity Information [Line Items]
Number of joint ventures \| joint_venture	1	1
Deferred rental payments	$ 2,899
Proceeds from rents received	2,655
Deferred rental payments receivable	$ 129		$ 6,460
Unconsolidated Retail Properties at 100%
Entity Information [Line Items]
Number of managed retail properties \| property	10	10
Gross Leasable Area (square feet) \| ft²	2,470,193	2,470,134
Wholly-Owned Retail Properties
Entity Information [Line Items]
Number of retail properties \| property	55	56
Gross Leasable Area (square feet) \| ft²	8,394,757	8,488,479

The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property, by the lessor or lessee, respectively. Such receivable is reduced by allowances attributable to, for instance, credit risk associated with a lessee.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 35
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121598990&loc=d3e40879-112712

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121549951&loc=d3e39896-112707

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 25
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121549951&loc=d3e39927-112707

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.8)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant