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Employee Benefit Plans (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 USD ($) plan | Apr. 01, 2017 USD ($)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |
Amount Company expects to contribute to its pension plans | $ 5,000 |
Payment for pension benefits | $ 800 | $ 700
Multiemployer Plans [Abstract] |  |
Number Of Multiemployer Plans, Withdrawal Obligation Could Be Material | plan | 2 |
Number Of Multiemployer Plans Withdrawal Obligation Could Be Material Certified Red Zone | plan | 1 |
Number of Multiemployer Plans, Certified Red Zone | plan | 6 |
Number of Multiemployer Plans, Certified Yellow Zone | plan | 1 |
Number Of Multiemployer Plans, Withdrawal Obligation | plan | 2 |
Accrued liability representing the present value of scheduled withdrawal liability payments for under-funded multi-employer plan | $ 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 | $ 799 | 735
Interest cost | 1,625 | 1,669
Expected return on plan assets | (2,064) | (1,788)
Amortization of prior service cost | 9 | 9
Amortization of net loss | 888 | 1,203
Net pension cost | $ 1,257 | $ 1,828

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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