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v3.19.1

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 |

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