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Pension Plans and Other Postretirement Benefits | 3 Months Ended
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Mar. 31, 2020
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, 2020 and 2019 were as follows (in thousands):
| Three Months Ended March 31,
| 2020 |  | 2019
Pension Benefits Cost (Credit): |  |  |
Service cost | $ | 1,214 |  |  | $ | 1,130 |
Interest cost | 6,687 |  |  | 8,320 |
Expected return on assets | (10,063 | ) |  | (9,452 | )
Amortization of prior service benefit | (51 | ) |  | 6 |
Total net pension benefits (credit) cost | $ | (2,213 | ) |  | $ | 4 |
Postretirement Benefits Cost: |  |  |
Service cost | $ | 26 |  |  | $ | 24 |
Interest cost | 468 |  |  | 549 |
Total net postretirement benefits cost | $ | 494 |  |  | $ | 573 |
Total net pension and postretirement benefits (credit) cost | $ | (1,719 | ) |  | $ | 577 |
All components of net benefit cost (credit), other than service cost, are included in Other income, net on the consolidated statements of income. During the three-month periods ended March 31, 2020 and 2019, we made contributions of $5.4 million and $2.7 million respectively, to our qualified and nonqualified pension plans. We paid $0.7 million and $0.9 million in premiums to the U.S. postretirement benefit plan during the three-month periods ended March 31, 2020 and 2019, 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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