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PENSION BENEFITS
3 Months Ended
Mar. 31, 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:

Three Months Ended
U.S. PlansNon-U.S. Plans
March 31, March 31,
2018201720182017
Service cost$35$43$7$9
Interest cost1431473735
Expected return on plan assets(357)(315) (115)(99)
Amortization of prior service (credit)(11)(11) --
$(190)$(136)$(71)$(55)

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.