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Fair Value Measurements - Narrative (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) property	Dec. 31, 2019 USD ($) property	Dec. 31, 2018 USD ($) property
Fair Value Measurements (Additional Textual) [Abstract]
Number of retail properties impaired | property	1	1	3
Provision for asset impairment	$ 9,002,000	$ 2,359,000	$ 3,510,000
Equity in (losses) earnings and (impairment), net, of unconsolidated entities	(3,141,000)	957,000	(31,393,000)
Unconsolidated Entities
Fair Value Measurements (Additional Textual) [Abstract]
Provision for asset impairment	$ 6,059,000
Downtown Railyard Venture, LLC | Unconsolidated Entities
Fair Value Measurements (Additional Textual) [Abstract]
Impairment of investment in unconsolidated entities		29,933,000
IAGM Retail Fund I, LLC
Fair Value Measurements (Additional Textual) [Abstract]
Number of retail properties impaired | property	1
Provision for asset impairment	$ 11,015,000
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	9,002,000	2,359,000	3,510,000
Impairment of investment in unconsolidated entities	$ 0	$ 0	$ 29,933,000
Fair Value, Measurements, Nonrecurring | Capitalization Rate | Real Estate | IAGM Retail Fund I, LLC | Unconsolidated Entities
Fair Value Measurements (Additional Textual) [Abstract]
Investment property, measurement input	0.0850
Fair Value, Measurements, Nonrecurring | Discount Rate | Real Estate | IAGM Retail Fund I, LLC | Unconsolidated Entities
Fair Value Measurements (Additional Textual) [Abstract]
Investment property, measurement input	0.0950
Fair Value, Measurements, Nonrecurring | Minimum | Capitalization Rate | Real Estate | Downtown Railyard Venture, LLC | Unconsolidated Entities
Fair Value Measurements (Additional Textual) [Abstract]
Investment property, measurement input		0.0500
Fair Value, Measurements, Nonrecurring | Minimum | Discount Rate | Real Estate | Downtown Railyard Venture, LLC | Unconsolidated Entities
Fair Value Measurements (Additional Textual) [Abstract]
Investment property, measurement input		0.1000
Fair Value, Measurements, Nonrecurring | Maximum | Capitalization Rate | Real Estate | Downtown Railyard Venture, LLC | Unconsolidated Entities
Fair Value Measurements (Additional Textual) [Abstract]
Investment property, measurement input		0.0800
Fair Value, Measurements, Nonrecurring | Maximum | Discount Rate | Real Estate | Downtown Railyard Venture, LLC | Unconsolidated Entities
Fair Value Measurements (Additional Textual) [Abstract]
Investment property, measurement input		0.3500
Mortgages | Weighted Average Effective Market rate
Fair Value Measurements (Additional Textual) [Abstract]
Weighted average effective market interest rate	0.0425	0.0371
Line of Credit | Discount Rate
Fair Value Measurements (Additional Textual) [Abstract]
Weighted average effective market interest rate	0.0136	0.0277

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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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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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