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Employee Benefit Plans - Pension Expense From Continuing Operations (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Union-administered plans |  |  |
Amortization of: |  |  |
Postretirement benefit income | $ 10,582 | $ 9,326 | $ 15,553
Pension Plans |  |  |
Pension expense from continuing operations |  |  |
Interest cost | 84,960 | 78,234 |
Amortization of: |  |  |
Postretirement benefit income | 81,908 | 29,892 | 56,833
Pension Plans | Company-administered plans |  |  |
Pension expense from continuing operations |  |  |
Service cost | 11,007 | 12,108 | 12,345
Interest cost | 84,960 | 78,234 | 86,431
Expected return on plan assets | (91,034) | (101,980) | (91,062)
Pension settlement expense | 34,974 | 3,061 | 0
Amortization of: |  |  |
Net actuarial loss | 30,708 | 28,593 | 32,987
Prior service cost | 711 | 550 | 579
Postretirement benefit income | 71,326 | 20,566 | 41,280
Pension Plans | Union-administered plans |  |  |
Amortization of: |  |  |
Postretirement benefit income | 10,582 | 9,326 | 15,553
Pension Plans | United States | Company-administered plans |  |  |
Amortization of: |  |  |
Postretirement benefit income | 75,936 | 28,043 | 43,717
Pension Plans | Foreign Plan | Company-administered plans |  |  |
Amortization of: |  |  |
Postretirement benefit income | $ (4,610) | $ (7,477) | $ (2,437)

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 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 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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