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PENSION AND OTHER POST-RETIREMENT BENEFIT PLANS (Tables)
3 Months Ended
Mar. 27, 2021
Retirement Benefits [Abstract]  
Schedule of Net Periodic Cost
The following table provides the components of net periodic cost for the Company’s pension, deferred compensation and executive supplemental life insurance retirement plans:
 Three Months Ended
March 27, 2021March 28, 2020
(in thousands)
Service cost$911 $797 
Interest cost1,344 2,355 
Expected return on plan assets(1,983)(2,981)
Amortization of prior service cost (credit)(128)(125)
Amortization of net loss1,110 1,586 
Other adjustments— 125 
Net periodic cost$1,254 $1,757