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RELATED PARTY TRANSACTIONS (UNITED DOMINION REALTY, L.P.) (Details) - United Dominion Realty L.P. - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Related party transactions      
Related party management fees $ 16,900 $ 15,200 $ 15,400
Debt Instrument, Interest Rate Period End 3.43%    
Notes payable due to the General Partner $ 637,233 700,115  
Interest expense, related party 28,028 14,102 12,210
UDR, Inc.      
Related party transactions      
General and administrative expenses allocated to the Operating Partnership by UDR $ 13,800 13,500 $ 14,000
Note due August 2021      
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      
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      
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      
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      
Related party transactions      
Debt Instrument, Interest Rate Period End 3.43%    
Notes payable due to the General Partner $ 230,694 $ 293,576