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Pensions and Other Postretirement Benefit Plans (Schedule of Net Periodic Benefit Plan Cost) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Components of net periodic benefit cost: |  |  |
Curtailment (gain)/loss | $ (500) | $ (700) |
United States [Member] |  |  |
Weighted average assumptions used to determine net cost: |  |  |
Discount rate | 4.41% | 3.70% | 4.20%
Expected return on plan assets | 4.57% | 3.87% | 4.40%
Rate of compensation increase |  |  |
Non-U.S. Pension Plans [Member] |  |  |
Weighted average assumptions used to determine net cost: |  |  |
Discount rate | 2.98% | 2.83% | 2.98%
Expected return on plan assets | 4.45% | 4.83% | 4.46%
Rate of compensation increase | 3.02% | 3.04% | 3.29%
United States Postretirement Benefits Plan [Member] |  |  |
Weighted average assumptions used to determine net cost: |  |  |
Discount rate | 4.31% | 3.59% | 4.00%
Expected return on plan assets |  |  |
Rate of compensation increase | 3.00% |  |
Non-U.S. Postretirement Benefits Plan [Member] |  |  |
Weighted average assumptions used to determine net cost: |  |  |
Discount rate | 3.65% | 3.40% | 3.70%
Expected return on plan assets |  |  |
Rate of compensation increase | 3.00% | 3.00% | 3.00%
Pension Plans [Member] |  |  |
Components of net periodic benefit cost: |  |  |
Service cost | $ 2,543 | $ 2,723 | $ 2,720
Interest cost | 7,216 | 7,217 | 7,476
Expected return on assets | (8,285) | (8,873) | (8,152)
Amortization of prior service cost/(credit) | 68 | 34 | 36
Amortization of net actuarial loss | 2,253 | 2,219 | 2,628
Settlement | (16) | 2,246 |
Curtailment (gain)/loss | 466 | (752) |
Net periodic benefit cost | 4,245 | 4,814 | 4,708
Other postretirement benefits [Member] |  |  |
Components of net periodic benefit cost: |  |  |
Service cost | 189 | 232 | 244
Interest cost | 2,114 | 2,024 | 2,214
Expected return on assets |  |  |
Amortization of prior service cost/(credit) | (4,488) | (4,488) | (4,488)
Amortization of net actuarial loss | 2,227 | 2,956 | 2,811
Settlement |  |  |
Curtailment (gain)/loss |  |  |
Net periodic benefit cost | $ 42 | $ 724 | $ 781

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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/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)(5) -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)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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