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RELATED PARTY TRANSACTIONS (UNITED DOMINION REALTY, L.P.) (Details) - United Dominion Realty L.P. - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Related party transactions |  |  |  |  |
Related party management fees | $ 4,000 | $ 4,000 | $ 8,900 | $ 8,100 |
Debt Instrument, Interest Rate Period End | 3.24% |  | 3.24% |  |
Notes payable due to the General Partner | $ 655,619 |  | $ 655,619 |  | $ 637,233
Interest expense, related party | 6,462 | 7,194 | 13,184 | 14,375 |
UDR, Inc. |  |  |  |  |
Related party transactions |  |  |  |  |
General and administrative expenses allocated to the Operating Partnership by UDR | $ 2,900 | $ 3,400 | $ 6,600 | $ 7,000 |
Note due August 2021 |  |  |  |  |
Related party transactions |  |  |  |  |
Debt Instrument, Interest Rate Period End | 5.34% |  | 5.34% |  |
Notes payable due to the General Partner | $ 5,500 |  | $ 5,500 |  | 5,500
Note due December 2023 |  |  |  |  |
Related party transactions |  |  |  |  |
Debt Instrument, Interest Rate Period End | 5.18% |  | 5.18% |  |
Notes payable due to the General Partner | $ 83,196 |  | $ 83,196 |  | 83,196
Note due April 2026 |  |  |  |  |
Related party transactions |  |  |  |  |
Debt Instrument, Interest Rate Period End | 4.12% |  | 4.12% |  |
Notes payable due to the General Partner | $ 184,638 |  | $ 184,638 |  | 184,638
Note due November 2028 |  |  |  |  |
Related party transactions |  |  |  |  |
Debt Instrument, Interest Rate Period End | 4.69% |  | 4.69% |  |
Notes payable due to the General Partner | $ 133,205 |  | $ 133,205 |  | 133,205
Note due December 2028 |  |  |  |  |
Related party transactions |  |  |  |  |
Debt Instrument, Interest Rate Period End | 3.24% |  | 3.24% |  |
Notes payable due to the General Partner | $ 249,080 |  | $ 249,080 |  | $ 230,694

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