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Supplemental Retirement Plan and Related Post Retirement Benefits (Tables)
 6 Months Ended
Jun. 27, 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. 
Six Months EndedThree Months Ended
(In thousands)June 27, 2020June 29, 2019June 27, 2020June 29, 2019
Service Cost$111  $91  $56  $46  
Interest Cost418  458  209  229  
Amortization of Prior Service Cost193  193  96  96  
Amortization of Net Actuarial Losses324  150  162  75  
Net Periodic Cost$1,046  $892  $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: 
Six Months Ended
Three Months Ended
(In thousands)June 27, 2020June 29, 2019June 27, 2020June 29, 2019
Service Cost$7  $7  $3  $4  
Interest Cost17  23  8  11  
Amortization of Prior Service Cost8  8  4  4  
Amortization of Net Actuarial Losses20  21  11  11  
Net Periodic Cost$52  $59  $26  $30