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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 01, 2017
Jul. 02, 2016
Jul. 01, 2017
Jul. 02, 2016
Pension Plans [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Interest cost on accumulated post-retirement benefit obligation $ 611 $ 629 $ 1,222 $ 1,258
Expected return on plan assets (650) (676) (1,300) (1,352)
Amortization of net actuarial loss (gain) 170 145 340 290
Net periodic pension cost 131 98 262 196
Post-retirement Benefit [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost – benefits attributed to service during the period 7 31 14 62
Interest cost on accumulated post-retirement benefit obligation 34 44 68 88
Amortization of net actuarial loss (gain) (76) (49) (152) (98)
Net periodic pension cost $ (35) $ 26 $ (70) $ 52