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DERIVATIVES AND HEDGING ACTIVITY - Undesignated Interest Rate Derivatives (UNITED DOMINION REALTY, L.P.) (Details) $ in Thousands | Jun. 30, 2020 USD ($)
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United Dominion Realty L.P. | Interest rate contracts | Other assets | Not Designated as Hedging Instrument |
Fair value of Company's derivative financial instruments and their classification on Consolidated Balance Sheet |
Derivative Asset Not Designated as Hedging Instrument, Fair Value | $ 8

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