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EMPLOYEE BENEFIT PLANS (Benefit Obligation and Plan Assets) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Change in plan assets:      
Contribution $ 300 $ 300 $ 400
Pension Plans      
Change in projected benefit obligation:      
Benefit obligation at beginning of period 66,747 62,427  
Interest cost 2,287 2,446 2,515
Actuarial (gain) loss (4,371) 4,269  
Benefits paid (2,366) (2,395)  
Benefit obligation at end of period 62,297 66,747 62,427
Change in plan assets:      
Fair value of plan assets at beginning of year 54,437 51,213  
Actual return on plan assets (2,507) 5,619  
Fair value of plan assets at end of year 55,564 54,437 51,213
Contribution 6,000 0  
Defined Benefit Plan, Benefit Obligation, Benefits Paid 2,366 2,395  
Postretirement Benefit      
Change in projected benefit obligation:      
Benefit obligation at beginning of period 3,969 4,125  
Service cost 32 30 123
Interest cost 123 137 177
Actuarial (gain) loss (573) 26  
Plan participants' contribution 1 6  
Benefit obligation at end of period 3,228 3,969 $ 4,125
Change in plan assets:      
Defined Benefit Plan, Benefit Obligation, Benefits Paid 324 355  
Postretirement Benefit | Other Long Term Liabilities      
Change in projected benefit obligation:      
Benefit obligation at beginning of period 3,600    
Benefit obligation at end of period $ 2,900 $ 3,600