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Defined Benefit Plans | 6 Months Ended
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Jun. 30, 2017
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract] |
Defined Benefit Plans | Defined Benefit Plans Net periodic pension benefit costs for the Company's defined benefit pension plans cover certain foreign employees, union hourly employees and salaried employees. The components of net periodic pension cost for the three and six months ended June 30, 2017 and 2016 are as follows (dollars in thousands):
|  | Pension Plans
|  | Three months ended June 30, |  | Six months ended June 30,
|  | 2017 |  | 2016 |  | 2017 |  | 2016
Service costs |  | $ | 270 |  |  | $ | 240 |  |  | $ | 550 |  |  | $ | 490 |
Interest costs |  | 320 |  |  | 390 |  |  | 640 |  |  | 790 |
Expected return on plan assets |  | (360 | ) |  | (420 | ) |  | (730 | ) |  | (840 | )
Amortization of net loss |  | 250 |  |  | 250 |  |  | 500 |  |  | 480 |
Net periodic benefit cost |  | $ | 480 |  |  | $ | 460 |  |  | $ | 960 |  |  | $ | 920 |
The Company contributed approximately $0.8 million and $1.1 million to its defined benefit pension plans during the three and six months ended June 30, 2017, respectively. The Company expects to contribute approximately $3.1 million to its defined benefit pension plans for the full year 2017.

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