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Pension and Postretirement Benefits - Accumulated Benefit Obligation in Excess of Plan Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Domestic Plans | Funded Plans |  |
Accumulated benefit obligation in excess of plan assets |  |
Projected benefit obligation | $ 15,440 | $ 15,027
Accumulated benefit obligation | 15,440 | 15,027
Fair value of plan assets | 11,590 | 10,416
Domestic Plans | Unfunded Pension Plans |  |
Accumulated benefit obligation in excess of plan assets |  |
Projected benefit obligation | 9,857 | 9,825
Accumulated benefit obligation | 9,826 | 9,737
Foreign Pension Plans | Funded Plans |  |
Accumulated benefit obligation in excess of plan assets |  |
Projected benefit obligation | 9,521 | 10,488
Accumulated benefit obligation | 8,819 | 9,906
Fair value of plan assets | 9,493 | 10,576
Foreign Pension Plans | Unfunded Pension Plans |  |
Accumulated benefit obligation in excess of plan assets |  |
Projected benefit obligation | 2,582 | 2,486
Accumulated benefit obligation | $ 2,582 | $ 2,486

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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 projected benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=77993564&loc=d3e4179-114921 + Details
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