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Fair Value Measurements - Narrative (Details) | 12 Months Ended
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Dec. 31, 2019 USD ($) property | Dec. 31, 2018 USD ($) property | Dec. 31, 2017 USD ($)
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Number of retail properties impaired | property | 1 | 3 |
Provision for asset impairment | $ 2,359,000 | $ 3,510,000 | $ 27,754,000
Impairment of investment in unconsolidated entities | 0 | 29,933,000 | 0
Downtown Railyard Venture, LLC | Unconsolidated Entities |  |  |
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Impairment of investment in unconsolidated entities |  | 29,933,000 |
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 | 2,359,000 | 3,510,000 | 27,754,000
Impairment of investment in unconsolidated entities | $ 0 | $ 29,933,000 | $ 0
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 | Measurement Input, 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 | Measurement Input, Discount Rate | Real Estate | Downtown Railyard Venture, LLC | Unconsolidated Entities |  |  |
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Investment property, measurement input |  | 0.3500 |
Fair Value, Measurements, Nonrecurring | Real Estate |  |  |
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Discounted cash flow method, term |  | 10 years |
Fair Value, Measurements, Nonrecurring | Real Estate | Minimum | Capitalization Rate |  |  |
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Investment property, measurement input |  | 0.0700 |
Fair Value, Measurements, Nonrecurring | Real Estate | Minimum | Measurement Input, Discount Rate |  |  |
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Investment property, measurement input |  | 0.0800 |
Fair Value, Measurements, Nonrecurring | Real Estate | Maximum | Capitalization Rate |  |  |
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Investment property, measurement input |  | 0.0800 |
Fair Value, Measurements, Nonrecurring | Real Estate | Maximum | Measurement Input, Discount Rate |  |  |
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Investment property, measurement input |  | 0.0900 |
Mortgages | Weighted Average Effective Market rate |  |  |
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Weighted average effective market interest rate | 0.0371 | 0.0438 |
Line of Credit and Term Loan | Measurement Input, Discount Rate |  |  |
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Weighted average effective market interest rate | 0.0277 | 0.0363 |
Retail |  |  |
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Provision for asset impairment |  | $ 27,754,000 |
Retail | Fair Value, Measurements, Nonrecurring | Real Estate |  |  |
Fair Value Measurements (Additional Textual) [Abstract] |  |  |
Provision for asset impairment, properties affected | property |  | 6 |

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