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REDEEMABLE PREFERRED STOCK - Dividends (Details) - USD ($)
$ in Thousands
1 Months Ended 11 Months Ended 12 Months Ended
Dec. 03, 2019
Aug. 08, 2019
Jun. 04, 2019
Feb. 20, 2019
Dec. 04, 2018
Aug. 22, 2018
Jun. 04, 2018
Mar. 06, 2018
Dec. 31, 2017
Nov. 20, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Class of Stock [Line Items]                          
Cash Dividends                         $ 490
Series A Preferred Stock                          
Class of Stock [Line Items]                          
Number of Shares (in shares) 4,468,315 4,091,980 3,601,721 3,149,924 2,847,150 2,457,119 2,149,863 1,674,841          
Cash Dividends $ 1,467 $ 1,318 $ 1,150 $ 1,010 $ 890 $ 769 $ 662 $ 493     $ 4,945 $ 2,814  
Series L Preferred Stock                          
Class of Stock [Line Items]                          
Number of Shares (in shares) 5,387,160       8,080,740                
Cash Dividends $ 8,406       $ 14,045           $ 12,150 $ 14,045  
Redeemable preferred stock prorated cash dividend                 $ 1,436        
Redeemable preferred stock dividends accumulated                         $ 1,436
Tender Offer | Series L Preferred Stock                          
Class of Stock [Line Items]                          
Dividends, preferred stock, aggregate value                   $ 3,744      
Authorized shares for repurchase (in shares)                   2,693,580