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Pension Plans and Other Postretirement Benefits (Tables) | 3 Months Ended
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Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract] |
Domestic and Foreign Pension and Postretirement Defined Benefit Plans | The components of pension and postretirement benefits cost (credit) for the three-month periods ended March 31, 2016 and 2015 are as follows (in thousands):
| Three Months Ended March 31,
| 2016 |  | 2015
Pension Benefits Cost (Credit): |  |  |
Service cost | $ | 1,540 |  |  | $ | 1,979 |
Interest cost | 10,601 |  |  | 9,564 |
Expected return on assets | (11,309 | ) |  | (11,082 | )
Actuarial gain | (50 | ) |  | — |
Amortization of prior service benefit | 28 |  |  | 30 |
Total net pension benefits cost | $ | 810 |  |  | $ | 491 |
Postretirement Benefits Cost (Credit): |  |  |
Service cost | $ | 29 |  |  | $ | 66 |
Interest cost | 621 |  |  | 668 |
Expected return on assets | (47 | ) |  | (65 | )
Amortization of prior service benefit | (24 | ) |  | (24 | )
Settlements/curtailments(a) | — |  |  | (2,594 | )
Total net postretirement benefits cost (credit) | $ | 579 |  |  | $ | (1,949 | )
Total net pension and postretirement benefits cost (credit) | $ | 1,389 |  |  | $ | (1,458 | )
(a) | We assumed responsibility for one domestic OPEB plan in connection with the acquisition of Rockwood which covered a small number of active employees and retirees. This plan was terminated in the first quarter of 2015 and provisions were made for the affected employees and retirees to receive benefits under an existing plan. A gain of $2.6 million was recognized in the first quarter of 2015 related to the termination of this plan.

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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=58740216&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=58740216&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=58740216&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=58242635&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=58740216&loc=d3e1928-114920 + Details
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