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Pension Plans and Other Postretirement Benefits | 9 Months Ended
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Sep. 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 nine-month periods ended September 30, 2019 and 2018 were as follows (in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Pension Benefits Cost (Credit): |  |  |  |  |  |  |
Service cost | $ | 1,118 |  |  | $ | 1,238 |  |  | $ | 3,371 |  |  | $ | 3,765 |
Interest cost | 8,314 |  |  | 7,967 |  |  | 24,854 |  |  | 24,010 |
Expected return on assets | (9,414 | ) |  | (10,703 | ) |  | (28,311 | ) |  | (32,227 | )
Amortization of prior service benefit | (5 | ) |  | 25 |  |  | 7 |  |  | 71 |
Total net pension benefits cost (credit) | $ | 13 |  |  | $ | (1,473 | ) |  | $ | (79 | ) |  | $ | (4,381 | )
Postretirement Benefits Cost (Credit): |  |  |  |  |  |  |
Service cost | $ | 24 |  |  | $ | 29 |  |  | $ | 73 |  |  | $ | 88 |
Interest cost | 549 |  |  | 542 |  |  | 1,647 |  |  | 1,626 |
Expected return on assets | — |  |  | (1 | ) |  | — |  |  | (5 | )
Amortization of prior service benefit | — |  |  | (12 | ) |  | — |  |  | (36 | )
Total net postretirement benefits cost | $ | 573 |  |  | $ | 558 |  |  | $ | 1,720 |  |  | $ | 1,673 |
Total net pension and postretirement benefits cost (credit) | $ | 586 |  |  | $ | (915 | ) |  | $ | 1,641 |  |  | $ | (2,708 | )
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 nine-month periods ended September 30, 2019, we made contributions of $2.1 million and $8.6 million, respectively, to our qualified and nonqualified pension plans. During the three-month and nine-month periods ended September 30, 2018, we made contributions of $3.1 million and $9.0 million, respectively, to our qualified and nonqualified pension plans. We paid $0.8 million and $2.1 million in premiums to the U.S. postretirement benefit plan during the three-month and nine-month periods ended September 30, 2019, respectively. During the three-month and nine-month periods ended September 30, 2018, we paid $0.8 million and $2.0 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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