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DERIVATIVES AND HEDGING ACTIVITY (UNITED DOMINION REALTY, L.P.) (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 USD ($) instrument | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) instrument | Jun. 30, 2019 USD ($) | Dec. 31, 2019 instrument
Derivatives |  |  |  |  |
Estimated additional accumulated other comprehensive Income/(Loss) transferred to interest expense | $ 3,900 |  | $ 3,900 |  |
Not Designated as Hedging Instrument |  |  |  |  |
Outstanding interest rate derivatives not designated as hedging instrument |  |  |  |  |
Notional | 0 |  | 0 |  |
United Dominion Realty L.P. | Maximum |  |  |  |  |
Derivatives |  |  |  |  |
Estimated additional accumulated other comprehensive Income/(Loss) transferred to interest expense | $ 100 |  | $ 100 |  |
United Dominion Realty L.P. | Cash Flow Hedging |  |  |  |  |
Outstanding interest rate derivatives not designated as hedging instrument |  |  |  |  |
Number instruments | instrument | 1 |  | 1 |  | 0
United Dominion Realty L.P. | Not Designated as Hedging Instrument |  |  |  |  |
Outstanding interest rate derivatives not designated as hedging instrument |  |  |  |  |
Number instruments | instrument | 0 |  | 0 |  |
United Dominion Realty L.P. | Interest rate contracts |  |  |  |  |
Derivatives |  |  |  |  |
Gain/(Loss) recognized in Interest Income and Other Income/(Expense), net | $ 0 | $ 0 | $ 0 | $ 0 |
United Dominion Realty L.P. | Interest rate caps | Cash Flow Hedging |  |  |  |  |
Outstanding interest rate derivatives not designated as hedging instrument |  |  |  |  |
Number instruments | instrument | 1 |  | 1 |  |
Notional | $ 19,880 |  | $ 19,880 |  |
Other income/(expense) | Interest rate contracts |  |  |  |  |
Derivatives |  |  |  |  |
Gain/(Loss) recognized in Interest Income and Other Income/(Expense), net | $ 0 | $ 0 | $ 0 | $ 0 |

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