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PENSION AND OTHER POST-RETIREMENT BENEFIT PLANS (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Pension        
Employee benefits        
Service cost $ 969 $ 774 $ 1,815 $ 1,528
Interest cost 2,656 2,939 5,489 5,765
Expected return on plan assets (4,012) (3,485) (7,889) (6,935)
Amortization of prior service credit (90) (139) (271) (258)
Amortization of net loss 886 1,047 1,531 2,013
Net periodic cost 409 1,136 675 2,113
Other Postretirement Benefits Plan        
Employee benefits        
Net periodic cost $ 0 $ 0 $ 0 $ 0