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RELATED PARTY TRANSACTIONS (UNITED DOMINION REALTY, L.P.) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Related party transactions      
Related party management fees $ 4,900 $ 4,000  
United Dominion Realty L.P.      
Related party transactions      
Debt Instrument, Interest Rate Period End 3.28%    
Notes payable due to the General Partner $ 635,738   $ 637,233
Interest expense, related party 6,722 7,181  
United Dominion Realty L.P. | UDR, Inc.      
Related party transactions      
General and administrative expenses allocated to the Operating Partnership by UDR $ 3,600 $ 3,600  
Note due August 2021 | United Dominion Realty L.P.      
Related party transactions      
Debt Instrument, Interest Rate Period End 5.34%    
Notes payable due to the General Partner $ 5,500   5,500
Note due December 2023 | United Dominion Realty L.P.      
Related party transactions      
Debt Instrument, Interest Rate Period End 5.18%    
Notes payable due to the General Partner $ 83,196   83,196
Note due April 2026 | United Dominion Realty L.P.      
Related party transactions      
Debt Instrument, Interest Rate Period End 4.12%    
Notes payable due to the General Partner $ 184,638   184,638
Note due November 2028 | United Dominion Realty L.P.      
Related party transactions      
Debt Instrument, Interest Rate Period End 4.69%    
Notes payable due to the General Partner $ 133,205   133,205
Note due December 2028 | United Dominion Realty L.P.      
Related party transactions      
Debt Instrument, Interest Rate Period End 3.28%    
Notes payable due to the General Partner $ 229,199   $ 230,694