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REDEEMABLE SERIES A PREFERRED STOCK - Dividends (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jul. 19, 2018
Jun. 18, 2018
Class of Stock [Line Items]              
Dividend rate (percentage)             13.00%
Dividends payable in cash     $ 6,366 $ 0 $ 0    
Dividends payable PIK     1,902 $ 0 $ 0    
Liability for unpaid dividends $ 89,582   89,582        
Cash Dividend              
Class of Stock [Line Items]              
Dividend rate (percentage)           10.00%  
Liability for unpaid dividends 68,909   68,909        
Payment In Kind Dividend              
Class of Stock [Line Items]              
Dividend rate (percentage)           3.00%  
Liability for unpaid dividends 20,673   20,673        
Series A Preferred Stock              
Class of Stock [Line Items]              
Dividend rate (percentage)           13.00%  
Dividends payable in cash 3,521 $ 2,839          
Dividends payable PIK 1,056 846          
Total dividends accrued in 2018     $ 8,268        
Total dividends accrued in 2018 (in usd per share)     $ 58.86        
Less dividends paid in 2018     $ (3,691)        
Dividends paid per share (usd per share)     $ (26.36)        
Liability for unpaid dividends $ 4,577   $ 4,577        
Dividends per share (in usd per share) $ 32.5   $ 32.5        
Series A Preferred Stock | Cash Dividend              
Class of Stock [Line Items]              
Total dividends $ 3,521 $ 2,839          
Total dividends accrued in 2018     $ 6,366        
Less dividends paid in 2018     (2,845)        
Liability for unpaid dividends $ 3,521   $ 3,521        
Dividends per share (in usd per share) $ 25 $ 20.28 $ 25        
Series A Preferred Stock | Payment In Kind Dividend              
Class of Stock [Line Items]              
Total dividends $ 1,056 $ 846          
Total dividends accrued in 2018     $ 1,902        
Less dividends paid in 2018     (846)        
Liability for unpaid dividends $ 1,056   $ 1,056        
Dividends per share (in usd per share) $ 7.5 $ 6.04 $ 7.5        
Series A Preferred Stock | Fractional Shares              
Class of Stock [Line Items]              
Dividends payable in cash     $ 6        
Total dividends     $ 6        
Dividends per share (in usd per share) $ 0.04   $ 0.04