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Pension Plans and Other Postretirement Benefits | 3 Months Ended
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Mar. 31, 2019
Retirement Benefits [Abstract] |
Pension Plans and Other Postretirement Benefits | Pension Plans and Other Postretirement Benefits: The components of pension and postretirement benefits cost (credit) for the three-month periods ended March 31, 2019 and 2018 were as follows (in thousands):
| Three Months Ended March 31,
| 2019 |  | 2018
Pension Benefits Cost (Credit): |  |  |
Service cost | $ | 1,130 |  |  | $ | 1,268 |
Interest cost | 8,320 |  |  | 8,027 |
Expected return on assets | (9,452 | ) |  | (10,764 | )
Amortization of prior service benefit | 6 |  |  | 22 |
Total net pension benefits cost (credit) | $ | 4 |  |  | $ | (1,447 | )
Postretirement Benefits Cost (Credit): |  |  |
Service cost | $ | 24 |  |  | $ | 29 |
Interest cost | 549 |  |  | 542 |
Expected return on assets | — |  |  | (2 | )
Amortization of prior service benefit | — |  |  | (12 | )
Total net postretirement benefits cost | $ | 573 |  |  | $ | 557 |
Total net pension and postretirement benefits cost (credit) | $ | 577 |  |  | $ | (890 | )
All components of net benefit cost (credit), other than service cost, are included in Other income (expenses), net on the consolidated statements of income. During the three-month periods ended March 31, 2019 and 2018, we made contributions of $2.7 million and $3.1 million, respectively, to our qualified and nonqualified pension plans. We paid $0.9 million and $0.5 million in premiums to the U.S. postretirement benefit plan during the three-month periods ended March 31, 2019 and 2018, respectively.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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