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Pension and Postretirement Benefits | 3 Months Ended
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Mar. 31, 2019
Compensation And Retirement Disclosure [Abstract] |
Pension and Postretirement Benefits |
7. | Pension and Postretirement Benefits
The estimated components of the recorded net periodic benefit cost (credit) for pension and postretirement benefits are as follows:
|  | Pension |  |  | Postretirement Benefits |
|  | Three Months Ended March 31, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
|  | (Dollars in Thousands) |
Service cost |  | $ | 7,872 |  |  | $ | 8,148 |  |  | $ | 15 |  |  | $ | 22 |
Interest cost |  |  | 9,395 |  |  |  | 8,361 |  |  |  | 131 |  |  |  | 125 |
Expected return on assets |  |  | (11,966 | ) |  |  | (10,629 | ) |  |  | — |  |  |  | — |
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost (credit) |  |  | 2 |  |  |  | 26 |  |  |  | (190 | ) |  |  | (611 | )
Actuarial loss (gain) |  |  | 3,932 |  |  |  | 3,296 |  |  |  | (118 | ) |  |  | (57 | )
Net periodic benefit cost (credit) |  | $ | 9,235 |  |  | $ | 9,202 |  |  | $ | (162 | ) |  | $ | (521 | )
The service cost component of net periodic benefit cost (credit) is included in cost of revenues – products and services and selling, general and administrative expenses. All other components are included in other nonoperating income, net, in the consolidated statements of earnings and comprehensive earnings.

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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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