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PENSION AND OTHER POST-RETIREMENT BENEFIT PLANS (Tables)
6 Months Ended
Jun. 27, 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 EndedSix Months Ended
June 27, 2020June 29, 2019June 27, 2020June 29, 2019
(in thousands)
Service cost$798  $757  $1,595  $1,387  
Interest cost2,354  2,875  4,709  5,750  
Expected return on plan assets(2,982) (3,235) (5,963) (6,470) 
Amortization of prior service cost (credit)(126) 91  (251) 182  
Amortization of net loss1,586  488  3,172  977  
Other adjustments125  —  250  —  
Net periodic cost$1,755  $976  $3,512  $1,826