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RELATED-PARTY TRANSACTIONS AND ARRANGEMENTS (Incentive Compensation) (Details) - Advisors - USD ($)
3 Months Ended 9 Months Ended
Aug. 20, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Related Party Transaction [Line Items]          
Incentive compensation. in excess of product, quarterly percentage 20.00%        
Incentive compensation. in excess of product, annualized percentage 7.00%        
Incentive compensation fees   $ 0 $ 0 $ 0 $ 0