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Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined Benefit Plan, Service Cost | $ 4,193 | $ 4,129
Defined Benefit Plan, Interest Cost | 3,300 | 3,164
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | 9,719 | 9,006
Defined Benefits Plan Net amortization and deferral | 1,887 | 2,074
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | (6,698) | (7,113)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | 2,585 | 3,326
Pension Plan [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year | 25,900 |
Pension Plan [Member] | Domestic Plan [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined Benefit Plan, Service Cost | 272 | 141
Defined Benefit Plan, Interest Cost | 1,061 | 1,094
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | 1,732 | 1,684
Defined Benefits Plan Net amortization and deferral | 0 | 0
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | (1,451) | (1,639)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | 1,052 | 1,190
Pension Plan [Member] | Foreign Plan [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined Benefit Plan, Service Cost | 3,921 | 3,988
Defined Benefit Plan, Interest Cost | 2,223 | 2,052
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | 7,987 | 7,322
Defined Benefits Plan Net amortization and deferral | 1,794 | 1,879
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | (5,560) | (5,947)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | 1,923 | 2,786
Other Postretirement Benefits Plan [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined Benefit Plan, Service Cost | 0 | 0
Defined Benefit Plan, Interest Cost | 16 | 18
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | 0 | 0
Defined Benefits Plan Net amortization and deferral | 93 | 195
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | 313 | 473
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | (390) | $ (650)
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year | $ 400 |

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- Definition Total amount of prior service cost/benefit and plan transition obligation recognized in the income statement in the current period. + References No definition available. + 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 Amount of contributions expected to be received by defined benefit plan from employer in fiscal year. Excludes contributions paid by employer in current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920 + 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 cost recognized for passage of time related to 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)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 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)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of net periodic benefit cost (credit) for 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) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for 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)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 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)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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