| Components of Net Periodic Benefit Cost |
The following is a summary of the net periodic benefit cost for the third quarter and first nine months of 2018 and 2017 for the domestic pension plans (which include the defined benefit pension plan and the supplemental retirement plans) and the domestic retiree medical plan. | | | | | | | | | | | | | | | | | | |
| Pension Benefits |
| Other Benefits | |
| Third Quarter Ended |
| Third Quarter Ended |
|
| Sept. 28, |
| Sept. 29, |
| Sept. 28, |
| Sept. 29, | (Thousands) |
| 2018 |
| 2017 |
| 2018 |
| 2017 | Components of net periodic benefit cost (benefit) |
|
|
|
|
|
|
|
| Service cost |
| $ | 1,674 |
|
| $ | 1,813 |
|
| $ | 27 |
|
| $ | 23 |
| Interest cost |
| 2,397 |
|
| 2,372 |
|
| 99 |
|
| 99 |
| Expected return on plan assets |
| (3,697 | ) |
| (3,385 | ) |
| — |
|
| — |
| Amortization of prior service benefit |
| (31 | ) |
| (42 | ) |
| (374 | ) |
| (374 | ) | Amortization of net loss |
| 1,959 |
|
| 1,623 |
|
| — |
|
| — |
| Net periodic benefit cost (benefit) |
| $ | 2,302 |
|
| $ | 2,381 |
|
| $ | (248 | ) |
| $ | (252 | ) | Settlements | | 359 |
| | — |
| | — |
| | — |
| Total net benefit cost | | $ | 2,661 |
| | $ | 2,381 |
| | $ | (248 | ) | | $ | (252 | ) |
| | | | | | | | | | | | | | | | | | | | Pension Benefits | | Other Benefits | | | Nine Months Ended | | Nine Months Ended | | | Sept. 28, | | Sept. 29, | | Sept. 28, | | Sept. 29, | (Thousands) | | 2018 | | 2017 | | 2018 | | 2017 | Components of net periodic benefit cost (benefit) | | | | | | | | | Service cost | | $ | 5,022 |
| | $ | 5,309 |
| | $ | 83 |
| | $ | 69 |
| Interest cost | | 7,191 |
| | 7,098 |
| | 297 |
| | 297 |
| Expected return on plan assets | | (11,091 | ) | | (10,128 | ) | | — |
| | — |
| Amortization of prior service benefit | | (92 | ) | | (236 | ) | | (1,123 | ) | | (1,122 | ) | Amortization of net loss | | 5,878 |
| | 4,821 |
| | — |
| | — |
| Net periodic benefit cost (benefit) | | $ | 6,908 |
| | $ | 6,864 |
| | $ | (743 | ) | | $ | (756 | ) | Settlements | | 359 |
| | — |
| | — |
| | — |
| Total net benefit cost | | $ | 7,267 |
| | $ | 6,864 |
| | $ | (743 | ) | | $ | (756 | ) |
|