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Retirement and Benefit Plans | 3 Months Ended
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Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract] |
Retirement and Benefit Plans | Retirement and Benefit Plans The following table presents the pension benefit costs:
| Three Months Ended March 31
| 2017 |  | 2016
| (thousands)
Service cost | $ | 301 |  |  | $ | 285 |
Interest cost | 4,376 |  |  | 4,782 |
Expected return on plan assets | (4,740 | ) |  | (5,103 | )
Amortization of actuarial loss | 395 |  |  | 478 |
Plan settlement loss | — |  |  | 297 |
Net periodic benefit expense | $ | 332 |  |  | $ | 739 |
During the three months ended March 31, 2017, we contributed $0.6 million in cash to the pension plans. For the remainder of 2017, we expect to make approximately $1.6 million in additional cash contributions to the pension plans.

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