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Retirement Plans (Tables) | 6 Months Ended
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Jun. 30, 2018
Retirement Benefits [Abstract] |
Defined Benefit Plan, Net Periodic Benefit Cost | 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 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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