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Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Components of Net periodic pension cost for the Company's defined benefit pension plans and U.S. post-retirement medical plan |  |
Service cost, net | $ 4,129 | $ 4,262
Interest cost on projected benefit obligations | 3,164 | 3,958
Expected return on plan assets | (9,006) | (10,346)
Net amortization and deferral | (2,074) | (1,730)
Recognition of actuarial losses/(gains) | 7,113 | 5,690
Net periodic pension cost/(credit) | 3,326 | 1,834
United States Pension Plans of US Entity, Defined Benefit [Member] |  |
Components of Net periodic pension cost for the Company's defined benefit pension plans and U.S. post-retirement medical plan |  |
Service cost, net | 141 | 117
Interest cost on projected benefit obligations | 1,094 | 1,292
Expected return on plan assets | (1,684) | (2,099)
Net amortization and deferral | 0 | 0
Recognition of actuarial losses/(gains) | 1,639 | 1,890
Net periodic pension cost/(credit) | 1,190 | 1,200
Foreign Pension Plans, Defined Benefit [Member] |  |
Components of Net periodic pension cost for the Company's defined benefit pension plans and U.S. post-retirement medical plan |  |
Service cost, net | 3,988 | 4,145
Interest cost on projected benefit obligations | 2,052 | 2,647
Expected return on plan assets | (7,322) | (8,247)
Net amortization and deferral | (1,879) | (1,261)
Recognition of actuarial losses/(gains) | 5,947 | 4,473
Net periodic pension cost/(credit) | 2,786 | 1,757
Net Periodic Benefit Cost (Textuals) [Abstract] |  |
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year | 18,900 |
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member] |  |
Components of Net periodic pension cost for the Company's defined benefit pension plans and U.S. post-retirement medical plan |  |
Service cost, net | 0 | 0
Interest cost on projected benefit obligations | 18 | 19
Expected return on plan assets | 0 | 0
Net amortization and deferral | (195) | (469)
Recognition of actuarial losses/(gains) | (473) | (673)
Net periodic pension cost/(credit) | (650) | $ (1,123)
Net Periodic Benefit Cost (Textuals) [Abstract] |  |
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year | $ 500 |

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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) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Gain or Loss -URI http://asc.fasb.org/extlink&oid=49168827 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)(4) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512171 Reference 2: 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=65897934&loc=d3e1928-114920 + Details
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- Definition The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time. + 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=65897934&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=65897934&loc=d3e1928-114920 + Details
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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + 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=65897934&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 (j) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Service Cost (Component of Net Periodic Pension Cost) -URI http://asc.fasb.org/extlink&oid=6525008 Reference 2: 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=65897934&loc=d3e1928-114920 Reference 3: 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=65897934&loc=d3e1928-114920 + Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period. + References No definition available. + Details
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