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Fair Value Measurements - Narrative (Details) | 12 Months Ended
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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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- 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 http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Value of input used to measure debt instrument, including, but not limited to, convertible and non-convertible debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=121548190&loc=d3e32787-111569 + Details
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