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NONCONTROLLING INTERESTS (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Redeemable noncontrolling interests in the Operating Partnership        
Minimum holding period prior to redemption (in years)     1 year  
Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership, at beginning of year     $ 1,299,442  
Mark-to-market adjustment to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership $ (90,252) $ 97,026 (376,515) $ 351,707
Conversion of OP Units/DownREIT Units to Common Stock or Cash     (30,743)  
Net income/(loss) attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership 1,533 1,260 2,684 2,221
Distributions to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership     (25,561)  
Redeemable Long-Term and Short-Term Incentive Plan Units     50,084  
Allocation of other comprehensive income/(loss)     920  
Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership, at end of year 920,311   920,311  
Net income/(loss) attributable to noncontrolling interests   41   57
Maximum        
Redeemable noncontrolling interests in the Operating Partnership        
Net income/(loss) attributable to noncontrolling interests $ (100) $ (100) $ (100) $ (100)