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Pension and Postretirement Benefits (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 01, 2018 | Jul. 02, 2017 | Jul. 01, 2018 | Jul. 02, 2017 | Dec. 31, 2017
Defined Benefit Plan Plan Amendment [Abstract] |  |  |  |  |
Defined Benefit Plan Accumulated Benefit Obligation Increase For Plan Amendment | $ 35,192 |  |  |  |
Date of resolution approval plan termination | February 2018 |  |  |  |
Pension [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Service cost | $ 667 | $ 921 | $ 1,352 | $ 1,873 |
Interest cost | 3,980 | 4,430 | 7,996 | 9,155 |
Expected return on assets | (5,174) | (5,880) | (10,379) | (12,161) |
Net amortization and deferrals | 2,965 | 2,519 | 5,942 | 5,213 |
Net periodic benefit cost | $ 2,438 | 1,990 | 4,911 | 4,080 |
Contributions to defined benefit pension plans |  |  | 540 |  |
Expected fiscal year defined benefit pension plan contributions |  |  | $ 1,300 |  |
Weighted average discount rate | 3.20% |  | 3.20% |  | 3.70%
Postretirement [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Service cost | $ 189 | 173 | $ 377 | 345 |
Interest cost | 293 | 295 | 585 | 590 |
Expected return on assets | 0 | 0 | 0 | 0 |
Net amortization and deferrals | 43 | 0 | 85 | 0 |
Net periodic benefit cost | $ 525 | $ 468 | $ 1,047 | $ 935 |

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- Definition Date Compensation Committee of the Company Board of Directors approved a resolution to terminate the Company U.S. defined benefit pension plan. + References No definition available. + Details
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- Definition The aggregate amount of net amortization and deferral that could be related to gains (losses), transition obligation or prior service cost or credit. + References No definition available. + Details
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- Definition Amount of increase (decrease) in accumulated benefit obligation from change in existing term of defined benefit plan or initiation of new 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 (r) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation 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 (k)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + 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 (d)(5)(ii) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(01) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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