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EMPLOYEE BENEFIT PLANS - Narrative (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
plan
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Cost recognized $ 1,733 $ 1,603 $ 1,488  
Common Stock, authorized (in shares) | shares 40,000,000 40,000,000    
Treasury Stock (in shares) | shares 1,200,103 1,087,840    
Number of active plans | plan 2      
Share-based compensation expense $ 2,723 $ 2,424 $ 2,612  
Grants in period (in shares) | shares 109,220      
Stock shares repurchased (in shares) | shares 10,437 77,481 27,214  
Stock shares repurchased $ 358 $ 5,489 $ 2,324  
EDC plan investments 2,007 1,185    
EDC plan liabilities $ 3,140 $ 1,337    
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grants in period (in shares) | shares 38,700 45,993 42,136  
Number of nonvested shares (in shares) | shares 118,855 116,855 329,205 368,492
RSUs vested in period (in shares) | shares 31,422 235,409 80,343  
Options, vested in period, fair value $ 1,384 $ 2,951 $ 1,239  
Unrecognized compensation costs, other than options $ 1,570      
Period for recognition of unrecognized compensation cost 1 year 7 months 6 days      
Short-term Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Targeted bonus award expense $ 9,732 461 5,581  
Short-term Incentive Plan | Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 2,566 123 $ 821  
Award vesting period 48 months      
Short-term Incentive Plan | Restricted Stock Units (RSUs) | Award vesting period, tranche one        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period 12 months      
Short-term Incentive Plan | Restricted Stock Units (RSUs) | Remaining award vesting period        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period 36 months      
The 2014 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock authorized but not granted (in shares) | shares 1,500,000      
The 2014 Plan | Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period 3 years      
Grants in period (in shares) | shares 421,748      
The Director's Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock authorized but not granted (in shares) | shares 300,000      
Post-employment benefits        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Liability, defined benefit plan, current $ 266 441    
Liability, defined benefit plan, noncurrent $ 1,476 $ 2,509