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Pensions and Other Postretirement Benefit Plans (Schedule of Plan Benefit Obligations) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
United States [Member] |  |  |
Weighted average assumptions used to determine benefit obligations, end of year: |  |  |
Discount rate | 3.70% | 4.20% |
Compensation increase |  |  |
Non-U.S. Pension Plans [Member] |  |  |
Weighted average assumptions used to determine benefit obligations, end of year: |  |  |
Discount rate | 2.83% | 2.98% |
Compensation increase | 3.02% | 3.29% |
United States Postretirement Benefits Plan [Member] |  |  |
Weighted average assumptions used to determine benefit obligations, end of year: |  |  |
Discount rate | 3.59% | 4.00% |
Compensation increase |  |  |
Non-U.S. Postretirement Benefits Plan [Member] |  |  |
Weighted average assumptions used to determine benefit obligations, end of year: |  |  |
Discount rate | 3.40% | 3.70% |
Compensation increase | 3.00% | 3.00% |
Pension Plans [Member] |  |  |
Change in benefit obligation: |  |  |
Benefit obligation, beginning of year | $ 210,856 | $ 199,856 |
Service cost | 2,720 | 2,656 | $ 2,959
Interest cost | 7,476 | 7,885 | 7,787
Plan participants' contributions | 211 | 249 |
Actuarial (gain)/loss | 6,626 | 17,676 |
Benefits paid | (7,697) | (7,057) |
Settlements and curtailments | (8) | (2,436) |
Plan amendments and other | (3) | 36 |
Foreign currency changes | 10,730 | (8,009) |
Benefit obligation, end of year | 230,911 | 210,856 | 199,856
Accumulated benefit obligation | 220,622 | 200,790 |
Other postretirement benefits [Member] |  |  |
Change in benefit obligation: |  |  |
Benefit obligation, beginning of year | 57,488 | 59,970 |
Service cost | 244 | 254 | 330
Interest cost | 2,214 | 2,443 | 2,437
Plan participants' contributions |  | 72 |
Actuarial (gain)/loss | 2,743 | (395) |
Benefits paid | (4,230) | (4,884) |
Settlements and curtailments |  |  |
Plan amendments and other |  |  |
Foreign currency changes |  | 28 |
Benefit obligation, end of year | 58,531 | 57,488 | $ 59,970
Accumulated benefit obligation |  |  |

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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 (e) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive 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 (a)(4) -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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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 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)(6) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of contributions received by defined benefit plan from participant which increase benefit obligation. + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of foreign currency translation gain (loss) which (increases) decreases 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 (a)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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