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Pension and Postretirement Benefits (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Apr. 01, 2018 | 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 |
U.S. pension plan [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Weighted average discount rate |  | 3.20% | 3.70%
Unrecognized losses, U.S. pension plan, remaining in accumulated other comprehensive loss | $ (141,578) |  |
Pension [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Service cost | 1,037 | $ 685 |
Interest cost | 2,205 | 4,016 |
Expected return on assets | (2,038) | (5,205) |
Net amortization and deferrals | 1,698 | 2,977 |
Net periodic benefit cost | 2,902 | 2,473 |
Contributions to defined benefit pension plans | 230 |  |
Expected fiscal year defined benefit pension plan contributions | 1,600 |  |
Postretirement [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Service cost | 178 | 188 |
Interest cost | 316 | 292 |
Expected return on assets | 0 | 0 |
Net amortization and deferrals | 5 | 42 |
Net periodic benefit cost | $ 499 | $ 522 |

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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, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + 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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