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Employee Benefit Plans (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 29, 2018 USD ($) plan | Sep. 30, 2017 USD ($) | Sep. 29, 2018 USD ($) plan | Sep. 30, 2017 USD ($)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Amount Company expects to contribute to its pension plans | $ 4,800 |  | $ 4,800 |
Payment for pension benefits |  |  | $ 2,800 | $ 2,600
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 | 6 |  | 6 |
Number of Multiemployer Plans, Certified Yellow Zone | plan | 1 |  | 1 |
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 | $ 1,700 |  | $ 1,700 |
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 | 762 | $ 759 | $ 2,340 | 2,244
Interest cost | 1,603 | 1,672 | 4,844 | 5,020
Expected return on plan assets | (2,053) | (1,799) | (6,176) | (5,377)
Amortization of prior service cost | 9 | 9 | 26 | 27
Amortization of net loss | 888 | 1,204 | 2,664 | 3,610
Net pension cost | $ 1,209 | $ 1,845 | $ 3,698 | $ 5,524

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