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Net Periodic Pension (Benefit) Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 26, 2020
Sep. 28, 2019
Sep. 26, 2020
Sep. 28, 2019
Retirement Benefits [Abstract]        
Service cost $ 0 $ 29 $ 0 $ 190
Interest cost on projected benefit obligation 723 881 2,169 2,899
Expected return on plan assets (1,210) (1,339) (3,630) (3,828)
Amortization of unrecognized loss 263 278 789 857
Net periodic pension (benefit) cost $ (224) $ (151) $ (672) $ 118