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Retirement and Benefit Plans | 6 Months Ended
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Jun. 30, 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 June 30 |  | Six Months Ended June 30
| 2017 |  | 2016 |  | 2017 |  | 2016
| (thousands)
Service cost | $ | 301 |  |  | $ | 282 |  |  | $ | 602 |  |  | $ | 567 |
Interest cost | 4,382 |  |  | 4,789 |  |  | 8,758 |  |  | 9,571 |
Expected return on plan assets | (4,742 | ) |  | (5,076 | ) |  | (9,482 | ) |  | (10,179 | )
Amortization of actuarial loss | 410 |  |  | 478 |  |  | 805 |  |  | 956 |
Plan settlement loss | — |  |  | — |  |  | — |  |  | 297 |
Net periodic benefit expense | $ | 351 |  |  | $ | 473 |  |  | $ | 683 |  |  | $ | 1,212 |
During the six months ended June 30, 2017, we contributed $1.1 million in cash to the pension plans. For the remainder of 2017, we expect to make approximately $1.0 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 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2410-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39675-114964 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66047640&loc=d3e39622-114963 + Details
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