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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
United States [Member] |  |  |
Weighted average assumptions used to determine net cost: |  |  |
Discount rate | 4.20% | 4.54% | 4.18%
Expected return on plan assets | 4.40% | 4.74% | 4.43%
Rate of compensation increase |  |  |
Non-U.S. Pension Plans [Member] |  |  |
Weighted average assumptions used to determine net cost: |  |  |
Discount rate | 2.98% | 3.67% | 3.58%
Expected return on plan assets | 4.46% | 5.39% | 5.52%
Rate of compensation increase | 3.29% | 3.24% | 3.23%
United States Postretirement Benefits Plan [Member] |  |  |
Weighted average assumptions used to determine net cost: |  |  |
Discount rate | 4.00% | 4.24% | 3.90%
Expected return on plan assets |  |  |
Rate of compensation increase |  |  |
Non-U.S. Postretirement Benefits Plan [Member] |  |  |
Weighted average assumptions used to determine net cost: |  |  |
Discount rate | 3.70% | 4.00% | 3.85%
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 | $ 2,720 | $ 2,656 | $ 2,959
Interest cost | 7,476 | 7,885 | 7,787
Expected return on assets | (8,152) | (8,675) | (8,630)
Amortization of prior service cost/(credit) | 36 | 38 | 48
Amortization of net actuarial loss | 2,628 | 2,283 | 2,594
Settlement |  | 162 | 103
Curtailment (gain)/loss |  | (111) |
Special/contractual termination benefits |  |  | 44
Net periodic benefit cost | 4,708 | 4,238 | 4,905
Other postretirement benefits [Member] |  |  |
Components of net periodic benefit cost: |  |  |
Service cost | 244 | 254 | 330
Interest cost | 2,214 | 2,443 | 2,437
Expected return on assets |  |  |
Amortization of prior service cost/(credit) | (4,488) | (4,488) | (4,488)
Amortization of net actuarial loss | 2,811 | 2,819 | 3,338
Settlement |  |  |
Curtailment (gain)/loss |  |  |
Special/contractual termination benefits |  |  |
Net periodic benefit cost | $ 781 | $ 1,028 | $ 1,617

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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 Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost 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 Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost 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)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related 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)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost of providing special or contractual termination benefits payable from 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 (q) -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 gain (loss) recognized in net periodic benefit (cost) credit from event reducing expected years of future service of present employees or eliminating accrual of defined benefits for some or all future services of present employees. + 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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