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Retirement Plans and Other Post-Retirement Benefits | 3 Months Ended
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Mar. 31, 2019
Compensation And Retirement Disclosure [Abstract] |
Retirement Plans and Other Post-Retirement Benefits |
11. | RETIREMENT PLANS AND OTHER POST-RETIREMENT BENEFITS
The following tables provide information with respect to the net periodic costs of our pension and post-retirement medical benefit plans included in continuing operations.
|  | Three months ended March 31 |
In thousands |  | 2019 |  |  |  | 2018 |
Pension Benefits |  |  |  |  |  |  |  |  |
Service cost |  | $ | 484 |  |  |  | $ | 594 |
Interest cost |  |  | 3,450 |  |  |  |  | 3,241 |
Expected return on plan assets |  |  | (3,696 | ) |  |  |  | (5,531 | )
Amortization of prior service cost |  |  | 34 |  |  |  |  | 5 |
Amortization of unrecognized loss |  |  | 775 |  |  |  |  | 2,060 |
Total net periodic benefit cost |  | $ | 1,047 |  |  |  | $ | 369 |
Other Benefits |  |  |  |  |  |  |  |  |
Service cost |  | $ | 9 |  |  |  | $ | 15 |
Interest cost |  |  | 84 |  |  |  |  | 80 |
Amortization of prior service credit |  |  | (2 | ) |  |  |  | — |
Amortization of actuarial gain |  |  | (173 | ) |  |  |  | (16 | )
Total net periodic benefit cost |  | $ | (82 | ) |  |  | $ | 79 |
In April 2019, we informed participants our qualified pension plan benefits would be frozen as of May 31, 2019 and the plan would be terminated June 30, 2019. We intend to replace this benefit for active employees with an enhanced defined contribution 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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