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Supplemental Retirement Plan and Related Post Retirement Benefits (Tables)
 3 Months Ended
Mar. 30, 2019
Retirement Benefits [Abstract]  
Summary of the Components of Net Periodic Cost The following table sets forth information regarding the net periodic pension cost for the plans. 
Three Months Ended
(In thousands)
March 30, 2019March 31, 2018
Service Cost
$45 $50 
Interest Cost
229 225 
Amortization of Prior Service Cost
97 97 
Amortization of Net Actuarial Losses
75 157 
Net Periodic Cost
$446 $529 
Participants in the SERP are entitled to paid medical, dental and long-term care insurance benefits upon retirement under the plan. The following table sets forth information regarding the net periodic cost recognized for those benefits: 
Three Months Ended
(In thousands)March 30, 2019March 31, 2018
Service Cost$3 $4 
Interest Cost12 11 
Amortization of Prior Service Cost4 4 
Amortization of Net Actuarial Losses10 15 
Net Periodic Cost$29 $34