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Pension Plans and Other Postretirement Benefits | 6 Months Ended
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Jun. 30, 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 and six-month periods ended June 30, 2019 and 2018 were as follows (in thousands):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Pension Benefits Cost (Credit): |  |  |  |  |  |  |
Service cost | $ | 1,123 |  |  | $ | 1,259 |  |  | $ | 2,253 |  |  | $ | 2,527 |
Interest cost | 8,220 |  |  | 8,016 |  |  | 16,540 |  |  | 16,043 |
Expected return on assets | (9,445 | ) |  | (10,760 | ) |  | (18,897 | ) |  | (21,524 | )
Amortization of prior service benefit | 6 |  |  | 24 |  |  | 12 |  |  | 46 |
Total net pension benefits credit | $ | (96 | ) |  | $ | (1,461 | ) |  | $ | (92 | ) |  | $ | (2,908 | )
Postretirement Benefits Cost (Credit): |  |  |  |  |  |  |
Service cost | $ | 25 |  |  | $ | 30 |  |  | $ | 49 |  |  | $ | 59 |
Interest cost | 549 |  |  | 542 |  |  | 1,098 |  |  | 1,084 |
Expected return on assets | — |  |  | (2 | ) |  | — |  |  | (4 | )
Amortization of prior service benefit | — |  |  | (12 | ) |  | — |  |  | (24 | )
Total net postretirement benefits cost | $ | 574 |  |  | $ | 558 |  |  | $ | 1,147 |  |  | $ | 1,115 |
Total net pension and postretirement benefits cost (credit) | $ | 478 |  |  | $ | (903 | ) |  | $ | 1,055 |  |  | $ | (1,793 | )
All components of net benefit cost (credit), other than service cost, are included in Other (expenses) income, net on the consolidated statements of income. During the three-month and six-month periods ended June 30, 2019, we made contributions of $3.8 million and $6.5 million, respectively, to our qualified and nonqualified pension plans. During the three-month and six-month periods ended June 30, 2018, we made contributions of $2.8 million and $5.9 million, respectively, to our qualified and nonqualified pension plans. We paid $0.4 million and $1.3 million in premiums to the U.S. postretirement benefit plan during the three-month and six-month periods ended June 30, 2019, respectively. During the three-month and six-month periods ended June 30, 2018, we paid $0.7 million and $1.2 million, respectively, in premiums to the U.S. postretirement benefit plan.

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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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