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PENSION AND OTHER POST-RETIREMENT BENEFIT PLANS (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 28, 2019
Sep. 29, 2018
Sep. 28, 2019
Sep. 29, 2018
Pension        
Employee benefits        
Service cost $ 701 $ 814 $ 2,088 $ 2,629
Interest cost 2,902 2,752 8,652 8,241
Expected return on plan assets (3,236) (3,801) (9,706) (11,690)
Amortization of prior service cost (credit) 92 (135) 274 (406)
Amortization of net loss 489 736 1,466 2,267
Net periodic cost 948 366 2,774 1,041
Other Postretirement Benefits Plan        
Employee benefits        
Net periodic cost $ 0 $ 0 $ 0 $ 0