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Retirement and Benefit Plans | 9 Months Ended
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Sep. 30, 2017
Retirement Benefits [Abstract] |
Retirement and Benefit Plans | Retirement and Benefit Plans The following table presents the pension benefit costs:
| Three Months Ended September 30 |  | Nine Months Ended September 30
| 2017 |  | 2016 |  | 2017 |  | 2016
| (thousands)
Service cost | $ | 301 |  |  | $ | 279 |  |  | $ | 903 |  |  | $ | 846 |
Interest cost | 4,392 |  |  | 4,805 |  |  | 13,150 |  |  | 14,376 |
Expected return on plan assets | (4,743 | ) |  | (5,131 | ) |  | (14,224 | ) |  | (15,310 | )
Amortization of actuarial loss | 441 |  |  | 584 |  |  | 1,245 |  |  | 1,540 |
Plan settlement loss | — |  |  | — |  |  | — |  |  | 297 |
Net periodic benefit expense | $ | 391 |  |  | $ | 537 |  |  | $ | 1,074 |  |  | $ | 1,749 |
During the nine months ended September 30, 2017, we contributed $1.7 million in cash to the pension plans. For the remainder of 2017, we expect to make approximately $0.5 million in additional cash contributions to the pension plans.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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