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STOCK-BASED COMPENSATION PLANS - Executive Equity Arrangements (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 2 Months Ended 3 Months Ended
Mar. 16, 2020
Mar. 31, 2020
May 31, 2018
Apr. 30, 2019
Mar. 31, 2020
Dec. 31, 2019
RSUs            
Stock-based compensation            
Eligible to vest (in shares) 462,963 5,748,331     5,748,331 2,790,060
Fair market value on date of grant $ 1.0          
Maximum number of shares to be settled (in shares) 4,750,000          
Granted (in shares)         4,123,151  
Vested (in shares)         927,062  
Grant date fair value (in dollars per share)   $ 3.10     $ 3.10 $ 5.11
PSUs            
Stock-based compensation            
Eligible to vest (in shares)   5,238,930     5,238,930 1,067,073
Granted (in shares)       872,073 4,847,500  
Vested (in shares)         315,866  
Grant date fair value (in dollars per share)   $ 2.52     $ 2.52 $ 5.94
PSUs | Market PSUs            
Stock-based compensation            
Granted (in shares)       348,829    
Percent of performance metrics achieved         200.00%  
Performance period (in years)         3 years  
PSUs | Performance PSUs            
Stock-based compensation            
Granted (in shares)       523,244    
Achievement level (as a percentage)   30.493%        
Percent of performance metrics achieved         200.00%  
PSUs | 2018 Performance Share Units            
Stock-based compensation            
Grant date fair value (in dollars per share)   $ 2.16     $ 2.16  
PSUs | Executives | 2018 Performance Share Units            
Stock-based compensation            
Granted (in shares)     195,000      
Percent of performance metrics achieved     150.00%      
Vested (in shares)     292,500