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Post-Retirement Health Care (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 27, 2020
Jun. 29, 2019
Jun. 27, 2020
Jun. 29, 2019
Retirement Benefits [Abstract]        
Service cost $ 194 $ 170 $ 389 $ 340
Interest cost 169 199 338 398
Amortization of net loss 9 0 9 0
Net periodic post-retirement benefit cost $ 372 $ 369 $ 736 $ 738