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Post-Retirement Health Care (Tables)
 9 Months Ended
Sep. 26, 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 EndedNine Months Ended
September 26,
2020		September 28,
2019		September 26,
2020		September 28,
2019
Service cost$194 $170 $583 $510 
Interest cost169 199 507 596 
Amortization of net loss5 — 14 — 
Net periodic post-retirement benefit cost$368 $369 $1,104 $1,106