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Investments in Real Estate Partnerships - Schedule of Investments in Real Estate Partnerships (Parenthetical) (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 31, 2020
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Provision for impairment, net of tax |  |  |  |  | $ 54,174 |  | $ 38,437 | $ 0 |
Ownership Percentage |  | 0.00% |  |  | 0.00% |  | 0.00% |  |
Equity One JV Portfolio, LLC [Member] |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Provision for impairment, net of tax |  |  |  | $ (10,900) |  |  |  |  |
Ownership Percentage |  | 30.00% | [1] |  | 30.00% | [1] | 30.00% |  |
US Regency Retail 1, LLC [Member] |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Ownership Percentage | [2] | 20.01% |  |  | 20.01% |  | 20.01% |  |
US Regency Retail 1, LLC [Member] | Accounts Payable and Accrued Liabilities [Member] |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Negative Investment Balance |  |  |  | $ 3,900 |  |  |  |  |
Other Investments in Real Estate Partnerships [Member] |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Ownership Percentage |  | 35.00% |  |  | 35.00% |  | 9.38% |  |
Additional Ownership Percentage Acquired |  | 9.00% |  |  |  |  |  |  |
Other Investments in Real Estate Partnerships [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Ownership Percentage |  |  |  |  |  |  |  |  | 16.62%
[1] | During the third quarter of 2019, a $10.9 million impairment of real estate was recognized within the NYC partnership from changes in the expected hold periods of various properties.
[2] | The USAA partnership has distributed proceeds from debt refinancing and real estate sales in excess of Regency’s carrying value of its investment resulting in a negative investment balance of $3.9 million, which is recorded within Accounts Payable and other liabilities in the Consolidated Balance Sheets.

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