Note 11. Pension Benefits Net periodic pension benefit income for our significant defined benefit plans include the following components: | | | U.S. Plans | | | | Three Months Ended | | | Six Months Ended | | | | June 30, | | | June 30, | | | | 2017 | | | 2016 | | | 2017 | | | 2016 | | | | | | | | | | | | | | | Service cost | | $ | 43 | | $ | 47 | | $ | 86 | | $ | 95 | | Interest cost | | | 146 | | | 150 | | | 293 | | | 300 | | Expected return on plan assets | | | (315) | | | (306) | | | (630) | | | (612) | | Amortization of prior service (credit) | | | (11) | | | (11) | | | (22) | | | (22) | | | $ | (137) | | $ | (120) | | $ | (273) | | $ | (239) | | | | | | | | | | | | | | | | | Non-U.S. Plans | | | | Three Months Ended | | | Six Months Ended | | | | June 30, | | | June 30, | | | | 2017 | | | 2016 | | | 2017 | | | 2016 | | | | | | | | | | | | | | | Service cost | | $ | 10 | | $ | 13 | | $ | 19 | | $ | 25 | | Interest cost | | | 37 | | | 47 | | | 72 | | | 94 | | Expected return on plan assets | | | (102) | | | (100) | | | (201) | | | (199) | | Amortization of prior service (credit) | | | - | | | (1) | | | - | | | (2) | | | $ | (55) | | $ | (41) | | $ | (110) | | $ | (82) | | | | | | | | | | | | | |
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