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DERIVATIVES AND HEDGING ACTIVITY (UNITED DOMINION REALTY, L.P.) - Other Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Derivatives |  |  |
Losses in the fair value of derivatives not designated in hedging relationships |  |  | $ 1
Estimated additional accumulated other comprehensive Income/(Loss) transferred to interest expense | $ 1,700 |  |
Total amount of Interest expense presented on the Consolidated Statements of Operations | 170,917 | $ 134,168 | 128,711
United Dominion Realty L.P. |  |  |
Derivatives |  |  |
Losses in the fair value of derivatives not designated in hedging relationships |  |  | 100
Estimated additional accumulated other comprehensive Income/(Loss) transferred to interest expense | 0 |  |
Fair value of operating partnerships derivative financial instruments | 0 | 0 |
Total amount of Interest expense presented on the Consolidated Statements of Operations | 1,639 | 8,733 | 18,156
Cash Flow Hedging | Interest expense | United Dominion Realty L.P. |  |  |
Derivatives |  |  |
Losses in the fair value of derivatives not designated in hedging relationships | 0 |  |
Interest rate contracts | United Dominion Realty L.P. |  |  |
Derivatives |  |  |
Losses in the fair value of derivatives not designated in hedging relationships | 0 | 0 |
Interest rate contracts | United Dominion Realty L.P. | Maximum |  |  |
Derivatives |  |  |
Losses in the fair value of derivatives not designated in hedging relationships |  |  | (100)
Interest rate contracts | Other income/(expense) |  |  |
Derivatives |  |  |
Losses in the fair value of derivatives not designated in hedging relationships | 0 | 0 |
Interest rate contracts | Other income/(expense) | Maximum |  |  |
Derivatives |  |  |
Losses in the fair value of derivatives not designated in hedging relationships |  |  | (100)
Interest rate contracts | Other income/(expense) | United Dominion Realty L.P. |  |  |
Derivatives |  |  |
Losses in the fair value of derivatives not designated in hedging relationships | $ 0 | $ 0 | $ 1

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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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