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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Income Taxes (Details)
8 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Apr. 30, 2018
Accounting Policies [Abstract]          
Minimum dividend distribution percentage   90.00%      
Dividend distribution percentage 90.00% 90.00% 90.00%   90.00%
Capital gain   13.62% 38.53% 100.00%  
Ordinary income   7.91% 23.43% 0.00%  
Return of capital   78.47% 38.04% 0.00%