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SHAREHOLDERS' EQUITY Stock-Based Employee Compensation, Additional Information (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Oct. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock granted, options (in shares)   1,458,680   1,458,680  
Share-based compensation expense (benefit)   $ 1.3 $ 0.3 $ 0.1 $ 2.1
CEO          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense (benefit)       $ (2.4)  
Restricted stock units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock granted (in shares)   597,888   844,522  
Restricted stock units | CEO          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period 1 year        
Stock granted (in shares) 400,000        
Restricted stock units | Tranche 1          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period       3 years  
Vesting percentage       33.33%  
Restricted stock units | Tranche 2          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period       1 year  
Vesting percentage       33.33%  
Restricted stock units | Tranche 3          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period       3 years  
Vesting percentage       33.33%  
Restricted stock units | Tranche 4          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period       5 years  
Performance-based restricted stock units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period       3 years  
Stock granted (in shares)   0   62,290  
Threshold trading days       50 days  
Performance-based restricted stock units | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage       200.00%  
Stock Options | CEO          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period       4 years  
Service-based vesting       4 years  
Matching Stock Options | CEO          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period       4 years  
Stock granted, options (in shares)       400,000