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Pension Benefits and Other Postretirement Benefit Plans (Tables) | 3 Months Ended
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Mar. 31, 2019
Defined Benefit Plan [Abstract] |
Components of Net Periodic Benefit Cost | The components of net periodic (benefit) cost for the periods indicated were:
| Pension Benefits |  | Retirement Health and Life Insurance Benefits
(Dollars in thousands) | Three Months Ended |  | Three Months Ended
March 31, |  | March 31,
| 2019 |  | 2018 |  | 2019 |  | 2018
Service cost | $ | — |  |  | $ | — |  |  | $ | 18 |  |  | $ | 20 |
Interest cost | 1,784 |  |  | 1,680 |  |  | 15 |  |  | 15 |
Expected return of plan assets | (2,192 | ) |  | (2,169 | ) |  | — |  |  | — |
Amortization of prior service credit | — |  |  | — |  |  | (253 | ) |  | (400 | )
Amortization of net loss | 454 |  |  | 456 |  |  | — |  |  | — |
Net periodic cost (benefit) | $ | 46 |  |  | $ | (33 | ) |  | $ | (220 | ) |  | $ | (365 | )

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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