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PENSION AND OTHER POST-RETIREMENT BENEFIT PLANS (Tables)
9 Months Ended
Sep. 26, 2020
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 EndedNine Months Ended
September 26, 2020September 28, 2019September 26, 2020September 28, 2019
(in thousands)
Service cost$797 $701 $2,392 $2,088 
Interest cost2,355 2,902 7,064 8,652 
Expected return on plan assets(2,981)(3,236)(8,944)(9,706)
Amortization of prior service cost (credit)(125)92 (376)274 
Amortization of net loss1,586 489 4,758 1,466 
Other adjustments125 — 375 — 
Net periodic cost$1,757 $948 $5,269 $2,774