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Employee Benefit Plans (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 29, 2019 USD ($) plan | Jun. 30, 2018 USD ($) | Jun. 29, 2019 USD ($) plan | Jun. 30, 2018 USD ($)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Amount Company expects to contribute to its pension plans | $ 4,300 |  | $ 4,300 |
Payment for pension benefits |  |  | $ 1,500 | $ 1,500
Multiemployer Plans [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 | 2 |  | 2 |
Accrued liability representing the present value of scheduled withdrawal liability payments for under-funded multi-employer plan | $ 1,600 |  | $ 1,600 |
Maximum [Member] |  |  |  |
Multiemployer Plans [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 | 683 | $ 779 | $ 1,361 | 1,578
Interest cost | 1,714 | 1,616 | 3,424 | 3,241
Expected return on plan assets | (1,817) | (2,059) | (3,636) | (4,123)
Amortization of prior service cost | 9 | 8 | 18 | 17
Amortization of net loss | 1,147 | 888 | 2,293 | 1,776
Net pension cost | $ 1,736 | $ 1,232 | $ 3,460 | $ 2,489

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