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STOCKHOLDERS' EQUITY - Dividend Reinvestment Plan (Details) - shares
3 Months Ended 4 Months Ended 5 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Jun. 10, 2020
Sep. 30, 2021
Sep. 30, 2020
Dividend Reinvestment Plan          
Market price discount (as a percent)   3.00% 5.00%    
Common shares issued under Dividend Reinvestment Plan 31,000     31,000 77,000
Maximum          
Dividend Reinvestment Plan          
Market price discount (as a percent)   5.00%