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STOCK-BASED COMPENSATION PLANS - Executive Equity Arrangements (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 2 Months Ended 12 Months Ended
Mar. 15, 2019
shares
Mar. 31, 2017
executive
shares
Apr. 30, 2019
shares
Feb. 28, 2019
executive
shares
May 31, 2018
shares
Mar. 31, 2018
executive
shares
Apr. 30, 2019
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
participant
Dec. 31, 2017
USD ($)
Mar. 08, 2019
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share Price | $ / shares                     $ 4.97
Stock-based compensation | $               $ 12,601 $ 11,072 $ 25,657  
Vested (in shares)     292,500                
Performance Shares                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Granted (in shares)             872,073        
PSAs                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Granted (in shares)         195,000     872,073      
Stock-based compensation | $                 $ 300    
Percent of performance metrics achieved         150.00%            
Percent of performance metrics achieved, level one       106.49%              
Percent of performance metrics achieved, level two       150.00%              
Vested (in shares)       250,075       9,466      
Stock Bonus Election Program | 2018 Bonus Shares                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Uplift percentage                 20.00%    
Stock Bonus Election Program | Share-based Payment Arrangement                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Participants | participant                 23    
Granted (in shares) 198,949                    
Stock Bonus Election Program | Uplift Shares and 2018 Bonus Shares                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock-based compensation | $                 $ 1,100    
Performance PSUs | Performance Shares                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Granted (in shares)             523,244        
Percent of performance metrics achieved               200.00%      
Market PSUs | Performance Shares                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Granted (in shares)             348,829        
Percent of performance metrics achieved               200.00%      
2017 Performance Share Units | PSAs                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Granted (in shares)   165,000                  
Percent of performance metrics achieved       61.40%   130.00%          
Vested (in shares)       9,464   33,584          
Executive granted shares | executive   5                  
Number of remaining executives holding grants | executive       3   3          
March 31, 2017 | 2017 Performance Share Units | PSAs                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Percent of performance metrics achieved           100.00%          
Vested (in shares)           25,834          
March 31, 2018 | 2017 Performance Share Units | PSAs                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Vested (in shares)           7,750          
Percent achievement over target           30.00%          
Minimum | Stock Bonus Election Program | 2018 Bonus Shares                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Percentage of bonus available for program                 10.00%    
Maximum | Stock Bonus Election Program | 2018 Bonus Shares                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Percentage of bonus available for program                 50.00%    
Executive Officer | 2018 Performance Share Units | Performance Shares                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Percent of performance metrics achieved     150.00%                
Executive Officer | March 16, 2018 | 2018 Performance Share Units | Performance Shares                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Vested (in shares)       5,950