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Net Periodic Benefit Cost (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2016 USD ($) | Mar. 31, 2015 USD ($)
Components of Net periodic pension cost for the Company's defined benefit pension plans and U.S. post-retirement medical plan |  |
Service cost, net | $ 4,262 | $ 4,954
Interest cost on projected benefit obligations | 3,958 | 5,197
Expected return on plan assets | (10,346) | (11,693)
Net amortization and deferral | (1,730) | (1,442)
Recognition of actuarial losses/(gains) | 5,690 | 4,883
Net periodic pension cost/(credit) | $ 1,834 | 1,899
Net Periodic Benefit Cost (Textuals) [Abstract] |  |
Number of Employees offered Lump Sum Settlement of US Pension Plan | 700 |
Defined Benefit Plan, Settlements, Benefit Obligation | $ 14,600 |
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments | 8,300 |
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 | 117 | 209
Interest cost on projected benefit obligations | 1,292 | 1,608
Expected return on plan assets | (2,099) | (2,394)
Net amortization and deferral | 0 | 0
Recognition of actuarial losses/(gains) | 1,890 | 1,907
Net periodic pension cost/(credit) | 1,200 | 1,330
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 | 4,145 | 4,745
Interest cost on projected benefit obligations | 2,647 | 3,554
Expected return on plan assets | (8,247) | (9,299)
Net amortization and deferral | (1,261) | (973)
Recognition of actuarial losses/(gains) | 4,473 | 3,819
Net periodic pension cost/(credit) | 1,757 | 1,846
Net Periodic Benefit Cost (Textuals) [Abstract] |  |
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year | 19,400 |
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 | 19 | 35
Expected return on plan assets | 0 | 0
Net amortization and deferral | (469) | (469)
Recognition of actuarial losses/(gains) | (673) | (843)
Net periodic pension cost/(credit) | (1,123) | $ (1,277)
Net Periodic Benefit Cost (Textuals) [Abstract] |  |
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year | $ 500 |

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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=58740216&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=58740216&loc=d3e1928-114920 + Details
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- Definition Amount of net gain (loss) recognized in net periodic benefit cost due to settlements and curtailments. Curtailments result from an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services. Settlements result from an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits. + 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=58740216&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=58740216&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=58740216&loc=d3e1928-114920 + Details
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