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PENSION AND OTHER POST-RETIREMENT BENEFIT PLANS (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Pension        
Employee benefits        
Service cost $ 814 $ 749 $ 2,629 $ 2,277
Interest cost 2,752 2,663 8,241 8,428
Expected return on plan assets (3,801) (3,476) (11,690) (10,411)
Amortization of prior service credit (135) (134) (406) (392)
Amortization of net loss 736 1,017 2,267 3,030
Net periodic cost 366 819 1,041 2,932
Other Postretirement Benefits Plan        
Employee benefits        
Net periodic cost $ 0 $ 0 $ 0 $ 0