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Benefit Plans | 3 Months Ended
--- | ---
Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract] |
Benefit Plans | Benefit Plans The components of our consolidated net pension costs are set forth in the following table:
| Predecessor |  | Successor
| For the Three Months Ended March 31, 2015 |  | For the Three Months Ended March 31, 2016
| (Dollars in thousands)
Service cost | $ | 827 |  |  | $ | 508 |
Interest cost | 1,526 |  |  | 1,498 |
Expected return on plan assets | (1,354 | ) |  | (1,310 | )
Amortization of prior service cost | 1 |  |  | — |
Net cost | $ | 1,000 |  |  | $ | 696 |
The components of our consolidated net postretirement costs are set forth in the following table:
| Predecessor |  | Successor
| For the Three Months Ended March 31, 2015 |  | For the Three Months Ended March 31, 2016
| (Dollars in thousands)
Service cost | $ | 4 |  |  | $ | 1 |
Interest cost | 315 |  |  | 272 |
Amortization of prior service benefit | (43 | ) |  | — |
Net cost | $ | 276 |  |  | $ | 273 |

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