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Benefit Plans | 6 Months Ended
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Jun. 30, 2019
Retirement Benefits [Abstract] |
Benefit Plans | Retirement Plans and Postretirement Benefits The components of our consolidated net pension costs are set forth in the following table:
| For the Three Months Ended June 30, |  | For the Six Months Ended June 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
| (Dollars in thousands)
Service cost | $ | 575 |  |  | $ | 498 |  |  | $ | 1,150 |  |  | $ | 996 |
Interest cost | 1,316 |  |  | 1,241 |  |  | 2,632 |  |  | 2,482 |
Expected return on plan assets | (1,338 | ) |  | (1,502 | ) |  | (2,676 | ) |  | (3,004 | )
Net cost | $ | 553 |  |  | $ | 237 |  |  | $ | 1,106 |  |  | $ | 474 |
The components of our consolidated net postretirement costs are set forth in the following table:
| For the Three Months Ended June 30, |  | For the Six Months Ended June 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
| (Dollars in thousands)
Interest cost | 239 |  |  | 251 |  |  | 481 |  |  | 502 |
Net cost | $ | 239 |  |  | $ | 251 |  |  | $ | 481 |  |  | $ | 502 |

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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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