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Net Periodic Pension Cost (Details)
$ in Thousands
 3 Months Ended
Mar. 30, 2019
USD ($)
employee
Mar. 31, 2018
USD ($)
Retirement Benefits [Abstract]    
Service cost $ 113 $ 133
Interest cost on projected benefit obligation 1,045 963
Expected return on plan assets (1,194) (1,327)
Amortization of unrecognized loss 300 271
Net periodic pension cost (benefit) $ 264 $ 40
Number of participants not accruing future years of service | employee 29  
Decrease in pension benefit obligation $ 200  
Increase to AOCI, plan asset valuation $ 1,500