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COMPENSATION PLANS (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Apr. 30, 2007
Stock Incentive Plan 2007 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares reserved for future issuance         2,550,000
Share issued         2,181,000
Stock Incentive Plan 2017 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares reserved for future issuance 750,000   750,000    
Shares available for future grants 543,000   543,000    
Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     3 years    
Restricted stock units issued     184,200    
Total compensation costs     $ 8,800    
Compensation expense recognized $ 1,600 $ 1,000 $ 4,200 $ 2,600