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Benefit Plans | 6 Months Ended
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Jun. 30, 2017
Retirement Benefits [Abstract] |
Benefit Plans | Benefit Plans 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,
| 2016 |  | 2017 |  | 2016 |  | 2017
| (Dollars in thousands)
Service cost | $ | 508 |  |  | $ | 496 |  |  | $ | 1,016 |  |  | $ | 992 |
Interest cost | 1,498 |  |  | 1,385 |  |  | 2,996 |  |  | 2,769 |
Expected return on plan assets | (1,310 | ) |  | (1,389 | ) |  | (2,620 | ) |  | (2,777 | )
Net cost | $ | 696 |  |  | $ | 492 |  |  | $ | 1,392 |  |  | $ | 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,
| 2016 |  | 2017 |  | 2016 |  | 2017
| (Dollars in thousands)
Service cost | $ | 1 |  |  | $ | 1 |  |  | $ | 2 |  |  | $ | 1 |
Interest cost | 272 |  |  | 241 |  |  | 543 |  |  | 483 |
Net cost | $ | 273 |  |  | $ | 242 |  |  | $ | 545 |  |  | $ | 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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