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Defined Benefit Plans | 3 Months Ended
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Mar. 31, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract] |
Defined Benefit Plans | Defined Benefit Plans Net periodic pension and postretirement benefit costs for the Company's defined benefit pension plans and postretirement benefit plans cover certain foreign employees, union hourly employees and salaried employees. The components of net periodic pension and postretirement benefit costs for the three months ended March 31, 2015 and 2014 are as follows:
|  | Pension Plans |  | Other Postretirement Benefits
|  | Three months ended March 31, |  | Three months ended March 31,
|  | 2015 |  | 2014 |  | 2015 |  | 2014
|  | (dollars in thousands)
Service costs |  | $ | 240 |  |  | $ | 190 |  |  | $ | — |  |  | $ | — |
Interest costs |  | 420 |  |  | 440 |  |  | 10 |  |  | 10 |
Expected return on plan assets |  | (520 | ) |  | (520 | ) |  | — |  |  | — |
Amortization of net (gain)/loss |  | 380 |  |  | 280 |  |  | (10 | ) |  | (20 | )
Net periodic benefit cost |  | $ | 520 |  |  | $ | 390 |  |  | $ | — |  |  | $ | (10 | )
The Company contributed approximately $0.7 million to its defined benefit pension plans during the three months ended March 31, 2015. The Company expects to contribute approximately $3.5 million to its defined benefit pension plans for the full year 2015.

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