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Employee Benefit Plans (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 01, 2017 USD ($) plan | Jul. 02, 2016 USD ($) | Jul. 01, 2017 USD ($) plan | Jul. 02, 2016 USD ($)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Amount Company expects to contribute to its pension plans | $ 4,500 |  | $ 4,500 |
Payment for pension benefits |  |  | $ 1,600 | $ 2,100
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 | $ 1,800 |  | $ 1,800 |
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 | 750 | $ 685 | $ 1,485 | 1,322
Interest cost | 1,679 | 1,770 | 3,348 | 3,515
Expected return on plan assets | (1,790) | (1,890) | (3,578) | (3,775)
Amortization of prior service cost/(benefit) | 9 | 7 | 18 | 14
Amortization of net loss | 1,203 | 1,166 | 2,406 | 2,334
Curtailment gain | 0 | 0 | 0 | (1,223)
Settlement gain | 0 | (123) | 0 | (123)
Net pension cost | $ 1,851 | $ 1,615 | $ 3,679 | $ 2,064

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