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Employee Benefits Plans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Amortization of: |  |  |
Postretirement benefit income | $ 56,833 | $ 61,215 | $ 41,704
Company-administered plans: |  |  |
Pension expense from continuing operations |  |  |
Service cost | 12,345 | 12,977 | 13,820
Interest cost | 86,431 | 94,476 | 88,013
Expected return on plan assets | (91,062) | (90,588) | (98,892)
Amortization of: |  |  |
Net actuarial gain | 32,987 | 31,777 | 30,741
Prior service cost (credit) | 579 | 2,976 | (306)
Postretirement benefit income | 41,280 | 51,618 | 33,376
Union-administered plans |  |  |
Amortization of: |  |  |
Postretirement benefit income | 15,553 | 9,597 | 8,328
United States | Company-administered plans: |  |  |
Amortization of: |  |  |
Postretirement benefit income | 43,717 | 53,319 | 34,986
Domestic Plan | Company-administered plans: |  |  |
Amortization of: |  |  |
Postretirement benefit income | $ (2,437) | $ (1,701) | $ (1,610)

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + 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)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + 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)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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