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SUBSEQUENT EVENTS (Details) - $ / shares
3 Months Ended 12 Months Ended
Feb. 09, 2021
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Feb. 11, 2021
Subsequent Event [Line Items]            
Dividends declared, per common share (in usd per share)   $ 0.13 $ 0.24 $ 0.31 $ 0.52  
Subsequent Event            
Subsequent Event [Line Items]            
Dividends declared, per common share (in usd per share) $ 0.06          
Subsequent Event | Series D Preferred Stock            
Subsequent Event [Line Items]            
Stock redemption price (usd per share)           $ 1,000
Subsequent Event | Series D Depository shares            
Subsequent Event [Line Items]            
Stock redemption price (usd per share)           $ 25