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Benefit Plans | 9 Months Ended
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Sep. 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 September 30, 2014 |  | For the Period July 1, 2015 Through August 14, 2015 |  | For the Period August 15, 2015 Through September 30, 2015 |  | For the Nine Months Ended September 30, 2014 |  | For the Period January 1, 2015 Through August 14, 2015 |  | For the Period August 15, 2015 Through September 30, 2015
| (Dollars in thousands) |  | (Dollars in thousands)
Service cost | $ | 473 |  |  | $ | 323 |  |  | $ | 227 |  |  | $ | 1,419 |  |  | $ | 1,656 |  |  | $ | 227 |
Interest cost | 2,169 |  |  | 762 |  |  | 776 |  |  | 6,507 |  |  | 3,814 |  |  | 776 |
Expected return on plan assets | (1,938 | ) |  | (676 | ) |  | (658 | ) |  | (5,814 | ) |  | (3,384 | ) |  | (658 | )
Amortization of prior service cost | 1 |  |  | 1 |  |  | — |  |  | 3 |  |  | 3 |  |  | — |
Net cost | $ | 705 |  |  | $ | 410 |  |  | $ | 345 |  |  | $ | 2,115 |  |  | $ | 2,089 |  |  | $ | 345 |
; The components of our consolidated net postretirement costs are set forth in the following table:
| For the Three Months Ended September 30, 2014 |  | For the Period July 1, 2015 Through August 14, 2015 |  | For the Period August 15, 2015 Through September 30, 2015 |  | For the Nine Months Ended September 30, 2014 |  | For the Period January 1, 2015 Through August 14, 2015 |  | For the Period August 15, 2015 Through September 30, 2015
| (Dollars in thousands) |  | (Dollars in thousands)
Service cost | $ | 19 |  |  | $ | 3 |  |  | $ | 2 |  |  | $ | 57 |  |  | $ | 11 |  |  | $ | 2 |
Interest cost | 352 |  |  | 156 |  |  | 152 |  |  | 1,056 |  |  | 786 |  |  | 152 |
Curtailment loss | — |  |  | — |  |  | — |  |  | 1,048 |  |  | — |  |  | — |
Amortization of prior service benefit | (47 | ) |  | (22 | ) |  | — |  |  | (141 | ) |  | (108 | ) |  | — |
Net cost | $ | 324 |  |  | $ | 137 |  |  | $ | 154 |  |  | $ | 2,020 |  |  | $ | 689 |  |  | $ | 154 |
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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