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Benefit Plans | 6 Months Ended
--- | ---
Jun. 30, 2015
Compensation and Retirement Disclosure [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 |  | For the Six Months Ended
| June 30, |  | June 30,
| 2014 |  | 2015 |  | 2014 |  | 2015
| (Dollars in thousands) |  | (Dollars in thousands)
Service cost | $ | 473 |  |  | $ | 506 |  |  | $ | 946 |  |  | $ | 1,333 |
Interest cost | 2,169 |  |  | 1,526 |  |  | 4,338 |  |  | 3,052 |
Expected return on plan assets | (1,938 | ) |  | (1,354 | ) |  | (3,876 | ) |  | (2,708 | )
Amortization of prior service cost | 1 |  |  | 1 |  |  | 2 |  |  | 2 |
Net cost | $ | 705 |  |  | $ | 679 |  |  | $ | 1,410 |  |  | $ | 1,679 |
The components of our consolidated net postretirement costs are set forth in the following table:
| For the Three Months Ended |  | For the Six Months Ended
| June 30, |  | June 30,
| 2014 |  | 2015 |  | 2014 |  | 2015
| (Dollars in thousands) |  | (Dollars in thousands)
Service cost | $ | 19 |  |  | $ | 4 |  |  | $ | 38 |  |  | $ | 8 |
Interest cost | 352 |  |  | 315 |  |  | 704 |  |  | 630 |
Curtailment loss | 1,048 |  |  | — |  |  | 1,048 |  |  | — |
Amortization of prior service benefit | (47 | ) |  | (43 | ) |  | (94 | ) |  | (86 | )
Net cost | $ | 1,372 |  |  | $ | 276 |  |  | $ | 1,696 |  |  | $ | 552 |
On March 27, 2015, we settled $59.0 million of projected benefit obligations in the United Kingdom through the purchase of a group annuity contract. The purchase was fully funded with pension assets. The obligation associated with this transaction will require no additional cash contributions by the company. The results of this settlement were not material to our operations.

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