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Pensions and Other Postretirement Benefits (Schedule of Net Pension and Other Retirement Plan Costs) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 28, 2020 | Mar. 30, 2019
Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net service cost | $ 99 | $ 83
Interest cost | 129 | 157
Expected return on plan assets | (111) | (133)
Amortization of actuarial losses | 77 | 50
Net periodic benefit cost | 194 | 157
Other Postretirement Benefit Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net service cost | 31 | 31
Interest cost | 33 | 45
Expected return on plan assets | 0 | 0
Amortization of actuarial losses | 34 | 39
Net periodic benefit cost | $ 98 | $ 115

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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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