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STOCK-BASED COMPENSATION PLANS (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 24, 2020
USD ($)
$ / shares
shares
Jan. 28, 2020
USD ($)
$ / shares
shares
Jun. 30, 2020
USD ($)
item
$ / shares
shares
Jun. 30, 2020
USD ($)
item
installment
$ / shares
shares
Jun. 30, 2019
USD ($)
$ / shares
shares
Mar. 31, 2020
$ / shares
Dec. 31, 2019
USD ($)
$ / shares
Oct. 09, 2019
shares
Mar. 31, 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)     $ 203 $ (65) $ (115)          
Stock appreciation rights plan liability recorded for the outstanding units     $ 0 $ 0            
Restricted Stock Units                    
STOCK-BASED COMPENSATION PLANS                    
Granted (in units) | shares     550 73,700            
Granted (in dollars per unit) | $ / shares     $ 12.71 $ 18.98            
Total stock-based compensation expense (benefit)     $ 96 $ 163            
Unrecognized compensation cost related to non-vested stock-based compensation agreements     $ 1,236 $ 1,236            
Outstanding (in dollars per unit) | $ / shares     $ 18.98 $ 18.98   $ 19.03        
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                  
Total stock-based compensation expense (benefit)     $ 107 $ (228) $ (115)          
Unrecognized compensation cost related to non-vested stock-based compensation agreements     51 $ 51            
Number of installments | installment       4            
Stock appreciation rights plan liability recorded for the outstanding units     181 $ 181     $ 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 $ 7.46 $ 16.32 $ 16.32   $ 5.73 $ 5.73
Omnibus Incentive Plan                    
STOCK-BASED COMPENSATION PLANS                    
Authorized number of shares | shares               1,820,000