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INVESTMENT IN UNCONSOLIDATED JOINT VENTURE PARTNERSHIPS (Narrative) (Details)
$ in Thousands
9 Months Ended
Feb. 15, 2022
USD ($)
property
Feb. 14, 2022
Jun. 15, 2021
USD ($)
item
property
building
Sep. 30, 2022
USD ($)
property
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Jul. 15, 2020
item
Schedule of Equity Method Investments [Line Items]              
Number of joint venture partnerships | item     2       2
Investment in Partnerships       $ 19,492   $ 101,769  
Incremental additional cash investment       259,526 $ 585,021    
BTC II B Partnership              
Schedule of Equity Method Investments [Line Items]              
Investment in Partnerships       19,500      
Outside basis difference       $ 5,300      
BTC II Partnership | BTC II Partnership Agreement              
Schedule of Equity Method Investments [Line Items]              
Ownership interest percentage in the portfolio   100.00%          
BTC II Partnership | BTC II Partnership Agreement | BTC II Partnership              
Schedule of Equity Method Investments [Line Items]              
Ownership Percentage   12.00%          
BTC II Partnership | BTC II B Partnership Agreement | BTC II B Partnership              
Schedule of Equity Method Investments [Line Items]              
Ownership Percentage 8.00%     8.00%      
QR Limited Partner | BTC II Partnership Agreement              
Schedule of Equity Method Investments [Line Items]              
Interest in unconsolidated joint venture properties 100.00%            
Number of properties | property 14            
QR Limited Partner | BTC II Partnership              
Schedule of Equity Method Investments [Line Items]              
Limited partner ownership percentage   78.50%          
QR Limited Partner | BTC II B Partnership | BTC II B Partnership Agreement              
Schedule of Equity Method Investments [Line Items]              
Limited partner ownership percentage 90.00%            
BCG Limited Partner | BTC II Partnership              
Schedule of Equity Method Investments [Line Items]              
Redemption value $ 24,900            
BCG Limited Partner | BTC II Partnership | BCG Limited Partner | BTC II Partnership Agreement              
Schedule of Equity Method Investments [Line Items]              
Limited partner ownership percentage   1.70%          
BCG Limited Partner | BTC II B Partnership | BTC II B Partnership Agreement | BTC II B Partnership              
Schedule of Equity Method Investments [Line Items]              
Ownership Percentage 2.00%            
BTC II SLP | BTC II Partnership Agreement              
Schedule of Equity Method Investments [Line Items]              
Interest in unconsolidated joint venture properties 100.00%            
Number of properties | property 7            
BTC II SLP | BTC II Partnership | BTC II Partnership | BTC II Partnership Agreement              
Schedule of Equity Method Investments [Line Items]              
Limited partner ownership percentage   7.80%          
BTC I Partnership | BTC II Partnership | BTC II Partnership Agreement              
Schedule of Equity Method Investments [Line Items]              
Ownership interest in half of portfolio     100.00%        
Number of properties | building     22        
Number of excluded properties | property     1        
Purchase price of properties     $ 876,700        
Incremental additional investment     $ 580,000        
BTC II Partnership | BTC II Partnership | BTC II Partnership Agreement              
Schedule of Equity Method Investments [Line Items]              
Interest in unconsolidated joint venture properties 100.00%            
Number of properties | property 11            
Purchase price of properties $ 359,200            
Incremental additional cash investment       $ 259,500      
BTC II B Partnership | BTC II Partnership | BTC II B Partnership Agreement              
Schedule of Equity Method Investments [Line Items]              
Number of properties | property 5     5