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Net Periodic Pension Cost (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 29, 2019
USD ($)
employee
Jun. 30, 2018
USD ($)
Jun. 29, 2019
USD ($)
employee
Jun. 30, 2018
USD ($)
Retirement Benefits [Abstract]        
Service cost $ 48 $ 133 $ 161 $ 266
Interest cost on projected benefit obligation 973 963 2,018 1,926
Expected return on plan assets (1,295) (1,327) (2,489) (2,654)
Amortization of unrecognized loss 279 271 580 542
Net periodic pension cost $ 5 $ 40 $ 270 $ 80
Number of participants not accruing future years of service | employee 38   38  
Decrease in pension benefit obligation $ 300      
Decrease to AOCI, plan asset valuation $ 200   $ 200