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Retirement Benefit Plans | 3 Months Ended
--- | ---
Mar. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |
Retirement Benefit Plans |
| Retirement Benefit Plans
Our defined benefit pension plans and postretirement medical plan are described in Note 11 of our annual report on Form 10-K for the year ended December 31, 2014. We have contributed $126 and $380 during the first quarter of 2015 to our pension plans and to our postretirement medical plan, respectively. The components of the net periodic cost (benefit) for the three months ended March 31, 2015 and 2014 were as follows:
|  | Three Months Ended
|  | March 31
|  | Pension Benefits |  | Postretirement
|  | U.S. Plans |  | Non-U.S. Plans |  | Medical Benefits
|  | 2015 |  | 2014 |  | 2015 |  | 2014 |  | 2015 |  | 2014
Service cost |  | $ | 106 |  |  | $ | 124 |  |  | $ | 36 |  |  | $ | 38 |  |  | $ | 31 |  |  | $ | 32 |
Interest cost |  | 432 |  |  | 494 |  |  | 123 |  |  | 132 |  |  | 109 |  |  | 131 |
Expected return on plan assets |  | (652 | ) |  | (670 | ) |  | (144 | ) |  | (129 | ) |  | — |  |  | — |
Amortization of net actuarial loss |  | 226 |  |  | 44 |  |  | — |  |  | — |  |  | 35 |  |  | 11 |
Amortization of prior service cost (benefit) |  | 11 |  |  | 11 |  |  | 65 |  |  | 46 |  |  | — |  |  | (2 | )
Foreign currency |  | — |  |  | — |  |  | (83 | ) |  | 18 |  |  | — |  |  | — |
Net periodic cost (benefit) |  | $ | 123 |  |  | $ | 3 |  |  | $ | (3 | ) |  | $ | 105 |  |  | $ | 175 |  |  | $ | 172 |

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