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STOCKHOLDERS' EQUITY - Preferred Stock (Details) - Preferred Stock - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Aug. 23, 2019
Sep. 30, 2020
Sep. 30, 2020
Class of Stock [Line Items]      
Preferred stock, authorized (in shares)   50,000,000 50,000,000
Preferred stock, par value (in dollars per share)   $ 0.01 $ 0.01
Preferred stock, liquidation preference per share (in dollars per share)   $ 1,000 $ 1,000
Series D Depository Shares      
Class of Stock [Line Items]      
Interest in shares (percent)   2.50%  
Shares redeemed (in shares) 734,823 100 134,410
Payment for redemption of shares   $ 2 $ 2,700
Series D Preferred Stock      
Class of Stock [Line Items]      
Preferred stock, liquidation preference per share (in dollars per share)   $ 1,000 $ 1,000
Shares redeemed (in shares) 18,371 3 3,360
Payment for redemption of shares $ 19,400    
Deferred issuance costs reclassified to retained earnings $ 1,700 $ 0 $ 541
Series E Depository Shares      
Class of Stock [Line Items]      
Interest in shares (percent)   2.50%  
Shares redeemed (in shares) 980,928 6,502 70,967
Payment for redemption of shares   $ 163 $ 1,700
Series E Preferred Stock      
Class of Stock [Line Items]      
Preferred stock, liquidation preference per share (in dollars per share)   $ 1,000 $ 1,000
Shares redeemed (in shares) 24,523 163 1,774
Payment for redemption of shares $ 26,600    
Deferred issuance costs reclassified to retained earnings $ 3,400 $ (6) $ 27