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Benefit Plans | 6 Months Ended
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Jun. 30, 2020
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, |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
| (Dollars in thousands) |  |  |  |  |  |
Service cost | $ | 618 |  |  | $ | 575 |  |  | $ | 1,240 |  |  | $ | 1,150 |
Interest cost | 1,032 |  |  | 1,316 |  |  | 2,065 |  |  | 2,632 |
Expected return on plan assets | (1,282) |  |  | (1,338) |  |  | (2,566) |  |  | (2,676) |
Net cost | $ | 368 |  |  | $ | 553 |  |  | $ | 739 |  |  | $ | 1,106 |
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, |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
| (Dollars in thousands) |  |  |  |  |  |
Interest cost | $ | 174 |  |  | $ | 239 |  |  | 365 |  |  | 481 |
Net cost | $ | 174 |  |  | $ | 239 |  |  | $ | 365 |  |  | $ | 481 |

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