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SIERRA MERGER - Narrative (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Feb. 23, 2023
USD ($)
Feb. 25, 2022
USD ($)
$ / shares
shares
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Business Acquisition [Line Items]            
Share repurchase program term 12 months     12 months    
Purchases of shares in repurchase plan     $ 8,509,000 $ 10,854,000 $ 23,622,000  
Common Stock            
Business Acquisition [Line Items]            
Common stock aggregate amount $ 30,000,000 $ 30,000,000        
Common stock market price percent of NAV, threshold   90.00%        
Purchases of shares in repurchase plan     $ 1,000 $ 1,000 $ 2,000  
Sierra Income Corporation            
Business Acquisition [Line Items]            
Ownership percentage   58.70%        
Ownership percentage by noncontrolling owners   41.30%        
Sierra Merger            
Business Acquisition [Line Items]            
Share price (in dollars per share) | $ / shares   $ 0.9783641        
Conversion ratio   0.44973        
Equity interest issued number of shares (in shares) | shares   45,986,926        
Sierra Merger | Common Stock            
Business Acquisition [Line Items]            
Common stock aggregate amount   $ 30,000,000        
Common stock market price percent of NAV, threshold   90.00%        
Purchases of shares in repurchase plan           $ 30,000,000