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ACQUISITIONS AND DISPOSITIONS - Acquisitions (Details) - Acquisitions
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
apartmentUnit
Mar. 31, 2020
USD ($)
apartmentUnit
Acquisitions and development projects placed in service [Abstract]    
Acquisition costs $ 76,900 $ 46,300
Union Pointe Apartment Homes - Longmont, CO    
Acquisitions and development projects placed in service [Abstract]    
Number of homes | apartmentUnit 256  
Acquisition costs $ 76,900  
Form of consideration, Cash 76,900  
Investment allocation, Land 5,727  
Investment allocation, Building 69,966  
Investment allocation, Intangible Assets $ 1,207  
Ironwood Apartments - New Hope, MN    
Acquisitions and development projects placed in service [Abstract]    
Number of homes | apartmentUnit   182
Acquisition costs   $ 46,263
Form of consideration, Cash   28,600
Form of consideration, Other   17,663
Investment allocation, Land   2,165
Investment allocation, Building   36,869
Investment allocation, Intangible Assets   824
Investment allocation, Other   $ 6,405