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Fair Value Measurements - Narrative (Details)	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($) property	Dec. 31, 2020 USD ($) property
Fair Value Measurements (Additional Textual) [Abstract]
Number of retail properties impaired | property			1
Provision for asset impairment	$ 0	$ 0	$ 9,002,000
Unconsolidated Entities
Fair Value Measurements (Additional Textual) [Abstract]
Provision for asset impairment		$ 6,059,000
IAGM Retail Fund I, LLC
Fair Value Measurements (Additional Textual) [Abstract]
Number of retail properties impaired | property		1
Provision for asset impairment		$ 11,016,000
Fair Value, Measurements, Recurring | Level 1
Fair Value Measurements (Additional Textual) [Abstract]
Recurring fair value measurements	0	0
Fair Value, Measurements, Recurring | Level 3
Fair Value Measurements (Additional Textual) [Abstract]
Recurring fair value measurements	0	0
Fair Value, Measurements, Nonrecurring
Fair Value Measurements (Additional Textual) [Abstract]
Provision for asset impairment	0	$ 0	$ 9,002,000
Fair Value, Measurements, Nonrecurring | IAGM Retail Fund I, LLC | Real Estate | Unconsolidated Entities | Capitalization Rate
Fair Value Measurements (Additional Textual) [Abstract]
Investment property, measurement input		0.0850
Fair Value, Measurements, Nonrecurring | IAGM Retail Fund I, LLC | Real Estate | Unconsolidated Entities | Discount Rate
Fair Value Measurements (Additional Textual) [Abstract]
Investment property, measurement input		0.0950
Fair Value, Measurements, Nonrecurring | Level 3
Fair Value Measurements (Additional Textual) [Abstract]
Recurring fair value measurements	$ 0	$ 0

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Fair Value Measurements.

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Number Of Retail Properties Impaired

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- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=126905981&loc=d3e2420-110228

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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