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Retirement Plans | 6 Months Ended
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Jun. 30, 2018
Retirement Benefits [Abstract] |
Retirement Plans | 11 Retirement Plans The Company sponsors various retirement plans. The Company adopted new accounting guidance which requires that an employer disaggregate the service cost component from other components of net benefit cost. As a result of the adoption of this standard, the components of net periodic benefit cost other than the service cost component are included in other income in the consolidated statements of operations and all previous periods have been adjusted accordingly. The summary of the components of net periodic pension costs for the plans for the three and six months ended June 30, 2018 and July 1, 2017 is as follows (in thousands):
|  | Three Months Ended |
|  | June 30, 2018 |  |  | July 1, 2017 |
|  | U.S. Pension Plans |  |  | U.S. Retiree Healthcare Plan |  |  | Non-U.S. Pension Plans |  |  | U.S. Pension Plans |  |  | U.S. Retiree Healthcare Plan |  |  | Non-U.S. Pension Plans |
Service cost |  | $ | 142 |  |  | $ | 151 |  |  | $ | 1,339 |  |  | $ | 124 |  |  | $ | 170 |  |  | $ | 1,240 |
Interest cost |  |  | 1,627 |  |  |  | 162 |  |  |  | 416 |  |  |  | 1,696 |  |  |  | 159 |  |  |  | 368 |
Expected return on plan assets |  |  | (630 | ) |  |  | (175 | ) |  |  | (481 | ) |  |  | (2,487 | ) |  |  | (147 | ) |  |  | (414 | )
Net amortization: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service credit |  |  | — |  |  |  | (2 | ) |  |  | (32 | ) |  |  | — |  |  |  | — |  |  |  | (47 | )
Net actuarial loss |  |  | 772 |  |  |  | — |  |  |  | 171 |  |  |  | 734 |  |  |  | — |  |  |  | 235 |
Net periodic pension cost |  | $ | 1,911 |  |  | $ | 136 |  |  | $ | 1,413 |  |  | $ | 67 |  |  | $ | 182 |  |  | $ | 1,382 |
|  | Six Months Ended |
|  | June 30, 2018 |  |  | July 1, 2017 |
|  | U.S. Pension Plans |  |  | U.S. Retiree Healthcare Plan |  |  | Non-U.S. Pension Plans |  |  | U.S. Pension Plans |  |  | U.S. Retiree Healthcare Plan |  |  | Non-U.S. Pension Plans |
Service cost |  | $ | 284 |  |  | $ | 283 |  |  | $ | 2,713 |  |  | $ | 225 |  |  | $ | 273 |  |  | $ | 2,491 |
Interest cost |  |  | 3,246 |  |  |  | 318 |  |  |  | 844 |  |  |  | 3,415 |  |  |  | 309 |  |  |  | 726 |
Expected return on plan assets |  |  | (3,415 | ) |  |  | (353 | ) |  |  | (974 | ) |  |  | (5,150 | ) |  |  | (294 | ) |  |  | (816 | )
Net amortization: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service credit |  |  | — |  |  |  | (10 | ) |  |  | (63 | ) |  |  | — |  |  |  | — |  |  |  | (93 | )
Net actuarial loss |  |  | 1,541 |  |  |  | — |  |  |  | 348 |  |  |  | 1,385 |  |  |  | — |  |  |  | 466 |
Net periodic pension cost (benefit) |  | $ | 1,656 |  |  | $ | 238 |  |  | $ | 2,868 |  |  | $ | (125 | ) |  | $ | 288 |  |  | $ | 2,774 |
In 2018, the Company’s board of directors approved the termination of the frozen U.S. defined benefit pension plans. The Company anticipates that it will take six months to a year to settle all of these plans’ obligations and, during this timeframe, the Company may incur pension accounting charges in connection with the termination of these plans. During fiscal year 2018, the Company expects to contribute a total of approximately $4 million to $10 million to the Company’s defined benefit plans for all plans, excluding the U.S. defined benefit pension plans.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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