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Net Periodic Pension (Benefit) Cost (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 $ 0 $ 48 $ 0 $ 161
Interest cost on projected benefit obligation 723 973 1,446 2,018
Expected return on plan assets (1,210) (1,295) (2,420) (2,489)
Amortization of unrecognized loss 263 279 526 580
Net periodic pension (benefit) cost $ (224) $ 5 $ (448) $ 270