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v3.19.2

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 |

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