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Post-Retirement Health Care (Tables)
 6 Months Ended
Jun. 27, 2020
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost
The following table sets forth the components of net periodic benefit costs included in the Condensed Consolidated Statements of Comprehensive Income (in thousands):
 Three Months EndedSix Months Ended
June 27,
2020		June 29,
2019		June 27,
2020		June 29,
2019
Service cost$194  $170  $389  $340  
Interest cost169  199  338  398  
Amortization of net loss9  —  9  —  
Net periodic post-retirement benefit cost$372  $369  $736  $738