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UNCONSOLIDATED AFFILIATES AND COST METHOD INVESTMENT - Repayments (Details) - USD ($) $ in Thousands | 1 Months Ended | 2 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2018 | Jul. 31, 2017 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Principal Balance Repaid |  |  |  | $ 17,278 | $ 427,247 |
Mortgage loan |  |  | $ 102,446 | $ 0 | $ 1,802 | $ 0
CoolSprings Galleria |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Interest rate (as a percent) | 6.98% |  |  |  |  |
Principal Balance Repaid | $ 97,732 |  |  |  |  |
Mortgage loan | $ 155,000 |  |  |  |  |
Gulf Coast Town Center - Phase III |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Interest rate (as a percent) |  | 3.13% |  |  |  |
Principal Balance Repaid |  | $ 4,118 |  |  |  |
Ownership interest in joint venture (as a percent) |  |  |  |  | 50.00% |

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