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PENSION BENEFITS
6 Months Ended
Jun. 30, 2018
Pension Disclosure Paragraph Details [Abstract]  
Pension Benefits

Note 13. Pension Benefits

Net periodic pension benefit costs for our significant defined benefit plans include the following components:

U.S. Plans
Three Months EndedSix Months Ended
June 30, June 30,
2018201720182017
Service cost$35$43$70$86
Interest cost144146287293
Expected return on plan assets(357)(315) (714)(630)
Amortization of prior service (credit)(11)(11) (22)(22)
$(189)$(137)$(379)$(273)
Non-U.S. Plans
Three Months EndedSix Months Ended
June 30, June 30,
2018201720182017
Service cost$7$10$14$19
Interest cost36377372
Expected return on plan assets(114)(102) (228)(201)
Amortization of prior service (credit)-- (1)-
$(71)$(55)$(142)$(110)

In the first quarter of 2018, the asset mix of our U.S. Qualified Pension Plan (the “Plan”) was changed. Fixed income assets were increased to approximately 50% of the Plan’s total assets and matched with the liability profile of the Plan. The Plan’s remaining assets are comprised of return-seeking assets including, equity securities, private equity investments and real estate investments. We review our asset allocations on a regular basis in order to achieve our long-term investment objectives on a risk adjusted basis.