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Pensions and Other Postretirement Benefits (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 29, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Settlement loss | [1] | $ 673 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 |  |  |
Estimated actuarial items that will be amortized from AOCI loss |  | $ 400 |  |  |  |  |  |  |  | $ 400 |  |
Ultimate health care cost trend rate |  | 4.00% |  |  |  |  |  |  |  | 4.00% |  |
Defined benefit plan, employer contribution in 2019 |  | $ 1,300 |  |  |  |  |  |  |  | $ 1,300 |  |
Defined contribution plan matching expense |  |  |  |  |  |  |  |  |  | 700 | $ 700 | $ 700
Accrued pension and other postretirement costs |  | 14,982 |  |  |  | 16,424 |  |  |  | 14,982 | 16,424 |
Pension Plans |  |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accrued pension and other postretirement costs |  | 9,421 |  |  |  | 11,163 |  |  |  | 9,421 | 11,163 |
Other Retirement Obligations |  |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other retirement obligations |  | 1,300 |  |  |  | 1,200 |  |  |  | 1,300 | 1,200 |
Accrued pension and other postretirement costs |  | 4,645 |  |  |  | 4,726 |  |  |  | 4,645 | 4,726 |
Non-US | Pension Plans |  |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Settlement loss |  |  |  |  |  |  |  |  |  | 700 |  |
Nonqualified Plan | Deferred Compensation, Excluding Share-based Payments and Retirement Benefits |  |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Assets held-in-trust |  | 3,100 |  |  |  | 3,300 |  |  |  | 3,100 | 3,300 |
Accrued pension and other postretirement costs |  | 4,200 |  |  |  | 4,400 |  |  |  | 4,200 | 4,400 |
Unfunded Plan | Nonqualified Plan | Pension Plans |  |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Assets held-in-trust |  | 1,600 |  |  |  | 1,700 |  |  |  | 1,600 | 1,700 |
Non qualified pension plan liabilities |  |  |  |  |  | $ 2,300 |  |  |  |  | $ 2,300 |
Unfunded Plan | Nonqualified Plan | United States |  |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Non qualified pension plan liabilities |  | $ 2,200 |  |  |  |  |  |  |  | $ 2,200 |  |
[1] | The Company reports interim financial information for the 13-week periods beginning on a Sunday and ending on a Saturday, except for the first fiscal quarter, which always begins on January 1, and the fourth fiscal quarter, which always ends on December 31. The first, second, third, and fourth quarters of 2018 ended on March 31, June 30, September 29, and December 31, respectively. The first, second, third, and fourth quarters of 2017 ended on April 1, July 1, September 30, and December 31, respectively.

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- Definition The amount of cash, securities, or other assets held by a third-party trustee pursuant to the terms of an agreement which assets are available to be used by beneficiaries to that agreement only within the specific terms thereof and which agreement is expected to terminate more than one year from the balance sheet date (or operating cycle, if longer) at which time the assets held-in-trust will be released or forfeited. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(b)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(7) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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