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Retirement and Benefit Plans | 6 Months Ended
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Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract] |
Retirement and Benefit Plans | Retirement and Benefit Plans The following table presents the pension benefit costs:
| Three Months Ended June 30 |  | Six Months Ended June 30
| 2016 |  | 2015 |  | 2016 |  | 2015
| (thousands)
Service cost | $ | 282 |  |  | $ | 239 |  |  | $ | 567 |  |  | $ | 714 |
Interest cost | 4,789 |  |  | 4,744 |  |  | 9,571 |  |  | 9,451 |
Expected return on plan assets | (5,076 | ) |  | (5,495 | ) |  | (10,179 | ) |  | (10,695 | )
Amortization of actuarial loss | 478 |  |  | 1,311 |  |  | 956 |  |  | 2,910 |
Plan settlement loss | — |  |  | — |  |  | 297 |  |  | 501 |
Net periodic benefit expense | $ | 473 |  |  | $ | 799 |  |  | $ | 1,212 |  |  | $ | 2,881 |
In the first six months of 2016, we contributed $2.8 million in cash to the pension plans. For the remainder of 2016, we expect to make approximately $1.0 million in additional cash contributions to the pension plans.

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