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Pension Plans and Other Postretirement Benefits - Domestic and Foreign Pension and Postretirement Defined Benefit Plans (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total net pension and postretirement benefits (credit) cost | $ (915) | $ 74 | $ (2,708) | $ 67
Pension Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 1,238 | 1,067 | 3,765 | 3,090
Interest cost | 7,967 | 8,375 | 24,010 | 24,983
Expected return on assets | (10,703) | (9,960) | (32,227) | (29,799)
Amortization of prior service benefit | 25 | 29 | 71 | 102
Total net pension and postretirement benefits (credit) cost | (1,473) | (489) | (4,381) | (1,624)
Postretirement Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 29 | 30 | 88 | 91
Interest cost | 542 | 585 | 1,626 | 1,755
Expected return on assets | (1) | (28) | (5) | (83)
Amortization of prior service benefit | (12) | (24) | (36) | (72)
Total net pension and postretirement benefits (credit) cost | $ 558 | $ 563 | $ 1,673 | $ 1,691

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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/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 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)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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