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Employee Benefit Plans (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 03, 2021 USD ($) plan | Jun. 27, 2020 USD ($) | Jul. 03, 2021 USD ($) plan | Jun. 27, 2020 USD ($)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Amount Company expects to contribute to its pension plans | $ 3,800 |  | $ 3,800 |
Payment for pension benefits |  |  | $ 1,800 | $ 2,400
Defined Benefit Plan, Additional Information [Abstract] |  |  |  |
Number Of Multiemployer Plans, Withdrawal Obligation Could Be Material | plan | 2 |  | 2 |
Number Of Multiemployer Plans Withdrawal Obligation Could Be Material Certified Red Zone | plan | 1 |  | 1 |
Number of Multiemployer Plans, Certified Red Zone | plan | 5 |  | 5 |
Number of Multiemployer Plans, Certified Yellow Zone | plan | 2 |  | 2 |
Number Of Multiemployer Plans, Withdrawal Obligation | plan | 4 |  | 4 |
Additional Liability, Defined Benefit Pension Plan | $ 1,300 |  | $ 1,300 |
Accrued liability representing the present value of scheduled withdrawal liability payments for under-funded multi-employer plan | 3,900 |  | $ 3,900 |
Maximum [Member] |  |  |  |
Defined Benefit Plan, Additional Information [Abstract] |  |  |  |
Multiemployer Plan, Contributions To Individual Plan, Percent |  |  | 5.00% |
Pension Plan, Defined Benefit [Member] |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 796 | $ 749 | $ 1,581 | 1,504
Interest cost | 1,209 | 1,430 | 2,413 | 2,858
Expected return on plan assets | (2,328) | (2,032) | (4,649) | (4,071)
Amortization of prior service cost | 6 | 8 | 11 | 16
Amortization of actuarial loss | 1,053 | 854 | 2,105 | 1,708
Net pension cost | $ 736 | $ 1,009 | $ 1,461 | $ 2,015

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