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REDEEMABLE PREFERRED STOCK - Series D Preferred Stock Narrative (Details) - $ / shares
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 15, 2021
Dec. 15, 2020
Nov. 16, 2020
Sep. 02, 2020
Feb. 29, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2020
Jun. 29, 2020
Jun. 28, 2020
Dec. 31, 2019
Class of Stock [Line Items]                        
Preferred stock redemption, trading days prior to redemption         20 days       20 days      
Series D Preferred Stock                        
Class of Stock [Line Items]                        
Preferred stock, par value (in usd per share)         $ 25.00 $ 0.001     $ 0.001     $ 0.001
Cumulative dividend rate         5.65%              
Preferred dividend per share per quarter (in usd per share)         $ 0.35313              
Preferred dividends declared (in usd per share)       $ 0.353125                
Preferred dividends paid, per share amount (in usd per share)           $ 0.35313 $ 0.35313 $ 0.588542        
Series D Preferred Stock | Continuous Public Offering                        
Class of Stock [Line Items]                        
Purchase price (in usd per share)                   $ 24.50 $ 25.00  
Series D Preferred Stock | Forecast                        
Class of Stock [Line Items]                        
Preferred dividends paid, per share amount (in usd per share) $ 0.117708 $ 0.117708 $ 0.117708