Annual report pursuant to Section 13 and 15(d)

INCOME TAXES - Schedule of Taxable Common Stock Distributions (Details)

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INCOME TAXES - Schedule of Taxable Common Stock Distributions (Details) - $ / shares
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 16, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dividends per share (in dollars per share)                         $ 1.87 $ 1.60 $ 1.94
Ordinary Income                         77.53% 78.03% 66.64%
Long-term Capital Gain                         15.82% 1.03% 7.83%
Return of Capital                         6.65% 20.94% 25.53%
Dividends declared per share of common stock (in dollars per share) $ 0.50 $ 0.50 $ 0.50 $ 0.50 $ 0.50 $ 0.50 $ 0.50 $ 0.50 $ 0.50 $ 0.50 $ 0.50 $ 0.50 $ 2.00 $ 2.00 $ 1.98
Series A Preferred Stock                              
Dividends per share (in dollars per share)                         $ 0.69    
Ordinary Income                         84.18%    
Long-term Capital Gain                         15.82%    
Return of Capital                         0.00%    
Series B Preferred Stock                              
Dividends per share (in dollars per share)                         $ 0.45    
Ordinary Income                         84.18%    
Long-term Capital Gain                         15.82%    
Return of Capital                         0.00%