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Pension and Postretirement Benefits - Accumulated Benefit Obligation in Excess of Plan Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Domestic Plans | Funded Plans |  |
Accumulated benefit obligation in excess of plan assets |  |
Projected benefit obligation | $ 16,331 | $ 15,572
Accumulated benefit obligation | 16,331 | 15,572
Fair value of plan assets | 11,878 | 11,291
Domestic Plans | Unfunded Pension Plans |  |
Accumulated benefit obligation in excess of plan assets |  |
Projected benefit obligation | 9,776 | 9,462
Accumulated benefit obligation | 9,776 | 9,454
Foreign Pension Plans | Funded Plans |  |
Accumulated benefit obligation in excess of plan assets |  |
Projected benefit obligation | 10,916 | 9,990
Accumulated benefit obligation | 10,447 | 9,347
Fair value of plan assets | 10,798 | 10,013
Foreign Pension Plans | Unfunded Pension Plans |  |
Accumulated benefit obligation in excess of plan assets |  |
Projected benefit obligation | 2,449 | 2,331
Accumulated benefit obligation | $ 2,449 | $ 2,331

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- Definition Amount of plan asset for defined benefit plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920 + Details
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