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RELATED-PARTY TRANSACTIONS AND ARRANGEMENTS (Operating Expenses) (Details) - Advisors
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
quarter
Sep. 30, 2019
USD ($)
Minimum        
Related Party Transaction [Line Items]        
Reimbursement assumptions used, number of quarters | quarter     4  
Operating expense reimbursement percentage of average invested assets 2.00%   2.00%  
Operating expense reimbursement percentage of net income 25.00%   25.00%  
Operating expenses        
Related Party Transaction [Line Items]        
Related party transaction reimbursement of expenses deferred | $ $ 61 $ 109 $ 289 $ 457
Operating expenses | Minimum        
Related Party Transaction [Line Items]        
Reimbursement of expense threshold, percent of average invested assets 2.00%   2.00%  
Reimbursement of expense threshold, percent of net income 25.00%   25.00%