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PENSION AND OTHER POST-RETIREMENT BENEFIT PLANS (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 28, 2020
Mar. 30, 2019
Employee benefits    
Service cost $ 797 $ 630
Interest cost 2,355 2,875
Expected return on plan assets (2,981) (3,235)
Amortization of prior service cost (credit) (125) 91
Amortization of net loss 1,586 489
Other adjustments 125 0
Net periodic cost 1,757 850
Other Postretirement Benefits Plan    
Employee benefits    
Net periodic cost $ 0 $ 0