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Pension Plans and Other Postretirement Benefits | 3 Months Ended
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Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract] |
Pension Plans and Other Postretirement Benefits | Pension Plans and Other Postretirement Benefits: The components of pension and postretirement benefits cost (credit) from continuing operations for the three-month periods ended March 31, 2017 and 2016 were as follows (in thousands):
| Three Months Ended March 31,
| 2017 |  | 2016
Pension Benefits Cost (Credit): |  |  |
Service cost | $ | 1,003 |  |  | $ | 1,048 |
Interest cost | 8,288 |  |  | 9,366 |
Expected return on assets | (9,908 | ) |  | (10,173 | )
Actuarial gain | — |  |  | (50 | )
Amortization of prior service benefit | 27 |  |  | 28 |
Total net pension benefits (credit) cost | $ | (590 | ) |  | $ | 219 |
Postretirement Benefits Cost (Credit): |  |  |
Service cost | $ | 31 |  |  | $ | 29 |
Interest cost | 585 |  |  | 621 |
Expected return on assets | (28 | ) |  | (47 | )
Amortization of prior service benefit | (24 | ) |  | (24 | )
Total net postretirement benefits cost | $ | 564 |  |  | $ | 579 |
Total net pension and postretirement benefits (credit) cost(a) | $ | (26 | ) |  | $ | 798 |
(a) | For the three-month period ended March 31, 2016, $0.6 million of net pension and postretirement benefits cost are included in Income from discontinued operations (net of tax) in the consolidated statements of income. See Note 3, “Divestitures,” for additional information.
During the three-month periods ended March 31, 2017 and 2016, we made contributions of $2.4 million to our qualified and nonqualified pension plans for continuing operations. Contributions to discontinued operations qualified and nonqualified pension plans were $1.0 million for the three-month period ended March 31, 2016. We paid $0.5 million and $0.8 million in premiums to the U.S. postretirement benefit plan during the three-month periods ended March 31, 2017 and 2016, respectively. Multiemployer Plan Our contributions to the Pensionskasse Dynamit Nobel Versicherungsverein auf Gegenseitigkeit, Troisdorf (“DN Pensionskasse”) multiemployer plan for continuing operations were €0.2 million (approximately $0.2 million and $0.3 million) during the three-month periods ended March 31, 2017 and 2016, respectively. Contributions for discontinued operations were €0.2 million (approximately $0.2 million) during the three-month period ended March 31, 2016.

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