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Pension Plans and Other Postretirement Benefits (Tables) | 6 Months Ended
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Jun. 30, 2018
Retirement Benefits [Abstract] |
Domestic and Foreign Pension and Postretirement Defined Benefit Plans | The components of pension and postretirement benefits cost (credit) for the three-month and six-month periods ended June 30, 2018 and 2017 were as follows (in thousands):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Pension Benefits Cost (Credit): |  |  |  |  |  |  |
Service cost | $ | 1,259 |  |  | $ | 1,020 |  |  | $ | 2,527 |  |  | $ | 2,023 |
Interest cost | 8,016 |  |  | 8,320 |  |  | 16,043 |  |  | 16,608 |
Expected return on assets | (10,760 | ) |  | (9,931 | ) |  | (21,524 | ) |  | (19,839 | )
Amortization of prior service benefit | 24 |  |  | 46 |  |  | 46 |  |  | 73 |
Total net pension benefits credit | $ | (1,461 | ) |  | $ | (545 | ) |  | $ | (2,908 | ) |  | $ | (1,135 | )
Postretirement Benefits Cost (Credit): |  |  |  |  |  |  |
Service cost | $ | 30 |  |  | $ | 30 |  |  | $ | 59 |  |  | $ | 61 |
Interest cost | 542 |  |  | 585 |  |  | 1,084 |  |  | 1,170 |
Expected return on assets | (2 | ) |  | (27 | ) |  | (4 | ) |  | (55 | )
Amortization of prior service benefit | (12 | ) |  | (24 | ) |  | (24 | ) |  | (48 | )
Total net postretirement benefits cost | $ | 558 |  |  | $ | 564 |  |  | $ | 1,115 |  |  | $ | 1,128 |
Total net pension and postretirement benefits (credit) cost | $ | (903 | ) |  | $ | 19 |  |  | $ | (1,793 | ) |  | $ | (7 | )

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2439-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2410-114920 Reference 4: 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 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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