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Pensions and Other Postretirement Benefits (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jul. 01, 2017 | Jun. 30, 2018 | Jul. 01, 2017
Defined Benefit Pension Plan [Member] | Domestic Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net service cost | $ 0 | $ 0 | $ 0 | $ 0
Interest cost | 371 | 411 | 742 | 821
Expected return on plan assets | 0 | 0 | 0 | 0
Amortization of prior service cost (credit) | 36 | 36 | 72 | 72
Amortization of losses (gains) | 159 | 83 | 318 | 165
Curtailments and settlements | 0 | 0 | 0 | 0
Net periodic benefit cost | 566 | 530 | 1,132 | 1,058
Defined Benefit Pension Plan [Member] | Foreign Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net service cost | 927 | 925 | 1,875 | 1,828
Interest cost | 1,211 | 1,199 | 2,453 | 2,366
Expected return on plan assets | (479) | (518) | (967) | (1,024)
Amortization of prior service cost (credit) | 54 | 18 | 109 | 36
Amortization of losses (gains) | 1,566 | 1,523 | 3,170 | 3,001
Curtailments and settlements | 455 | 330 | 917 | 652
Net periodic benefit cost | 3,734 | 3,477 | 7,557 | 6,859
Other Postretirement Benefits [Member] | Domestic Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net service cost | 34 | 33 | 68 | 66
Interest cost | 68 | 78 | 136 | 155
Amortization of prior service cost (credit) | (37) | (209) | (74) | (418)
Amortization of losses (gains) | (9) | (23) | (19) | (46)
Net periodic benefit cost | 56 | (121) | 111 | (243)
Other Postretirement Benefits [Member] | Foreign Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net service cost | 73 | 67 | 148 | 131
Interest cost | 28 | 26 | 58 | 50
Amortization of prior service cost (credit) | 0 | 0 | 0 | 0
Amortization of losses (gains) | 27 | 15 | 54 | 29
Net periodic benefit cost | $ 128 | $ 108 | $ 260 | $ 210

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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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- Definition Amount of prior service cost (credit) 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)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost recognized for passage of time related to 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)(2) -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 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit from settlement and curtailment. + 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)(7) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for 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)(1) -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 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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