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SHARE-BASED COMPENSATION - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 19, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jun. 20, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted average period over which compensation costs are expected to be recognized   1 year 6 months      
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation expense   $ 3.5 $ 2.0 $ 2.1  
Income tax benefit recognized in earnings for benefit compensation   0.9 0.5 0.5  
2016 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized for issuance (in shares) 1,000,000       500,000
Increase in number of shares authorized for grant (in shares) 500,000        
Unrecognized compensation expense   $ 2.2 $ 3.0 $ 3.6  
2016 Plan | Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentages of vesting for one year   100.00%      
Percentages of vesting for two years   50.00%      
Percentages of vesting for three years   33.30%      
Percentages of vesting for five years   20.00%      
Percentages of vesting for ten years   10.00%      
Number of shares available for future grant (in shares)   612,692      
2016 Plan | Restricted Stock | Non-Employee Directors          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period   1 year      
2016 Plan | Common Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized for issuance (in shares) 1,000,000