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Supplemental Retirement Plan and Related Post Retirement Benefits (Tables)
 3 Months Ended
Mar. 28, 2020
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 28, 2020March 30, 2019
Service Cost$55  $45  
Interest Cost209  229  
Amortization of Prior Service Cost97  97  
Amortization of Net Actuarial Losses162  75  
Net Periodic Cost$523  $446  
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 28, 2020March 30, 2019
Service Cost$4  $3  
Interest Cost9  12  
Amortization of Prior Service Cost4  4  
Amortization of Net Actuarial Losses9  10  
Net Periodic Cost$26  $29