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STOCK-BASED COMPENSATION PLANS (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jun. 24, 2020
USD ($)
$ / shares
shares
Jan. 28, 2020
USD ($)
$ / shares
shares
Sep. 30, 2020
USD ($)
item
$ / shares
shares
Sep. 30, 2019
USD ($)
$ / shares
shares
Sep. 30, 2020
USD ($)
item
installment
$ / shares
shares
Sep. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2020
$ / shares
Dec. 31, 2019
USD ($)
$ / shares
Oct. 09, 2019
shares
Jun. 30, 2019
$ / shares
Dec. 31, 2018
$ / shares
STOCK-BASED COMPENSATION PLANS                      
Number of shares participant is entitled to receive | item     1   1            
Total stock-based compensation expense (benefit)     $ 25 $ 64 $ (40) $ (51)          
Stock appreciation rights plan liability recorded for the outstanding units     $ 0   $ 0            
Restricted Stock Units                      
STOCK-BASED COMPENSATION PLANS                      
Granted (in units) | shares       73,700            
Granted (in dollars per unit) | $ / shares         $ 18.98            
Total stock-based compensation expense (benefit)     $ 100   $ 263            
Unrecognized compensation cost related to non-vested stock-based compensation agreements     $ 1,136   $ 1,136            
Outstanding (in dollars per unit) | $ / shares     $ 18.98   $ 18.98   $ 18.98        
Restricted Stock Units | Key employees                      
STOCK-BASED COMPENSATION PLANS                      
Shares granted | shares   70,400                  
Vesting period   4 years                  
Restricted Stock Units | Non employee directors                      
STOCK-BASED COMPENSATION PLANS                      
Shares granted | shares 550 2,750                  
Granted (in dollars per unit) | $ / shares $ 12.71 $ 19.03                  
Fair value of units granted $ 7 $ 1,392                  
Stock Appreciation Rights                      
STOCK-BASED COMPENSATION PLANS                      
Granted (in units) | shares     110,160 110,160          
Granted (in dollars per unit) | $ / shares       $ 16.32   $ 16.32          
Total stock-based compensation expense (benefit)     $ (75) $ 64 $ (303) $ (51)          
Unrecognized compensation cost related to non-vested stock-based compensation agreements     27   $ 27            
Number of installments | installment         4            
Stock appreciation rights plan liability recorded for the outstanding units     106   $ 106     $ 409      
Stock appreciation rights plan liability recorded for the previously exercised units     $ 1,206   $ 1,206     $ 1,512      
Number of equal annual instalments in which the liability recorded for previously exercised units will be paid | installment         4            
Outstanding (in dollars per unit) | $ / shares     $ 16.32 $ 16.32 $ 16.32 $ 16.32 $ 16.32 $ 16.32   $ 7.46 $ 5.73
Omnibus Incentive Plan                      
STOCK-BASED COMPENSATION PLANS                      
Authorized number of shares | shares                 1,820,000