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DERIVATIVES AND HEDGING ACTIVITY (UNITED DOMINION REALTY, L.P.) - Gains and Losses (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Gains (losses) |  |  |
Gain/(Loss) recognized in Interest Income and Other Income/(Expense), net |  |  | $ (1)
United Dominion Realty L.P. |  |  |
Gains (losses) |  |  |
Gain/(Loss) recognized in Interest Income and Other Income/(Expense), net |  |  | (100)
United Dominion Realty L.P. | Interest expense | Cash Flow Hedging |  |  |
Gains (losses) |  |  |
Gain/(Loss) recognized in Interest Income and Other Income/(Expense), net | $ 0 |  |
Interest rate contracts | Other income/(expense) |  |  |
Gains (losses) |  |  |
Gain/(Loss) recognized in Interest Income and Other Income/(Expense), net | 0 | $ 0 |
Interest rate contracts | United Dominion Realty L.P. |  |  |
Gains (losses) |  |  |
Gain/(Loss) recognized in Interest Income and Other Income/(Expense), net | 0 | 0 |
Interest rate contracts | United Dominion Realty L.P. | Other income/(expense) |  |  |
Gains (losses) |  |  |
Gain/(Loss) recognized in Interest Income and Other Income/(Expense), net | $ 0 | $ 0 | (1)
Interest rate contracts | United Dominion Realty L.P. | Interest expense | Cash Flow Hedging |  |  |
Gains (losses) |  |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net |  |  | $ (106)

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- Definition The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=109977999&loc=d3e76258-113986 + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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