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STOCK-BASED COMPENSATION (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jan. 02, 2020
Jan. 04, 2019
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
May 31, 2020
May 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Excess tax benefit related to share-based payment awards         $ 93 $ 266      
Director                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares of stock awarded for services performed (in shares)         66,855 37,544 36,462    
RSUs                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Equity instruments other than options, granted (in shares)     114,944 90,073          
Share-based compensation, award vesting periods           3 years      
Number of shares of stock awarded for services performed (in shares)         232,586 162,465 123,711    
Share-based compensation costs         $ 7,200 $ 5,800 $ 4,400    
Performance-based RSUs                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Equity instruments other than options, granted (in shares)     50,787 34,848          
Share-based compensation, award vesting periods     3 years   3 years        
Share-based compensation, vesting percentage after change in control         100.00%        
Share-based compensation, period before change in control         6 months        
Share-based compensation, vesting period after change in control         24 months        
Long-Term Incentive Plan 2012                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Maximum number of shares issuable (in shares)               1,460,000  
Shares available for issuance (in shares)         1,409,320        
Long-Term Incentive Plan 2012 | RSUs                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share-based unrecognized compensation costs         $ 5,800        
ESPP                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Maximum number of shares issuable (in shares)                 500,000
Shares available for issuance (in shares)         380,342        
Share-based compensation costs         $ 186 $ 222 $ 91    
Stocks purchased under the plan (in shares) 32,179 32,331