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NONCONTROLLING INTERESTS (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
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, beginning of year     $ 856,294  
Mark-to-market adjustment to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership $ 122,981 $ 22,723 254,681 $ (182,990)
Conversion of OP Units/DownREIT Units to Common Stock     (5,339)  
Net income/(loss) attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership 807 4,291 961 4,604
Distributions to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership     (16,961)  
Vesting of Long-Term Incentive Plan Units     14,576  
Allocation of other comprehensive income/(loss)     64  
Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership, end of year 1,104,276   1,104,276  
Net income/(loss) attributable to noncontrolling interests 8 19 16 9
Maximum        
Redeemable noncontrolling interests in the Operating Partnership        
Net income/(loss) attributable to noncontrolling interests $ (100) $ (100) $ (100) $ (100)
LTIP Units | Minimum        
Redeemable noncontrolling interests in the Operating Partnership        
Vesting period     1 year  
LTIP Units | Maximum        
Redeemable noncontrolling interests in the Operating Partnership        
Vesting period     3 years