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Benefit Plans | 6 Months Ended
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Jun. 30, 2018
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,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (Dollars in thousands)
Service cost | $ | 498 |  |  | $ | 496 |  |  | $ | 996 |  |  | $ | 992 |
Interest cost | 1,241 |  |  | 1,385 |  |  | 2,482 |  |  | 2,769 |
Expected return on plan assets | (1,502 | ) |  | (1,389 | ) |  | (3,004 | ) |  | (2,777 | )
Net cost | $ | 237 |  |  | $ | 492 |  |  | $ | 474 |  |  | $ | 984 |
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,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (Dollars in thousands)
Service cost | $ | — |  |  | $ | 1 |  |  | $ | — |  |  | $ | 1 |
Interest cost | 251 |  |  | 241 |  |  | 502 |  |  | 483 |
Net cost | $ | 251 |  |  | $ | 242 |  |  | $ | 502 |  |  | $ | 484 |

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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