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SUBSEQUENT EVENTS (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Jan. 02, 2020
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Feb. 19, 2020
$ / shares
Subsequent Event [Line Items]          
Distributions declared | $   $ 3,379 $ 5,007 $ 3,920  
Subsequent Event | POSOR I          
Subsequent Event [Line Items]          
Merger, share ratio conversion         0.9643
Merger, issue price per share for incentive fees (in dollars per share) | $ / shares         $ 10.63
Subsequent Event | Dividend Paid          
Subsequent Event [Line Items]          
Distributions declared | $ $ 200        
Distributions declared per common share (in dollars per share) | $ / shares $ 0.00799167