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Employee Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2017
Retirement Benefits [Abstract] |
Net pension cost | Net pension cost for the three and nine months months ended September 30, 2017 and October 1, 2016 includes the following components (in thousands):
| Pension Benefits |  | Pension Benefits
| Three Months Ended |  | Nine Months Ended
| September 30, 2017 | October 1, 2016 |  | September 30, 2017 | October 1, 2016
Service cost | $ | 759 |  | $ | 599 |  |  | $ | 2,244 |  | $ | 1,921 |
Interest cost | 1,672 |  | 1,702 |  |  | 5,020 |  | 5,217 |
Expected return on plan assets | (1,799 | ) | (1,886 | ) |  | (5,377 | ) | (5,661 | )
Amortization of prior service cost | 9 |  | 8 |  |  | 27 |  | 22 |
Amortization of net loss | 1,204 |  | 1,168 |  |  | 3,610 |  | 3,502 |
Curtailment gain | — |  | (62 | ) |  | — |  | (1,285 | )
Settlement gain | — |  | — |  |  | — |  | (123 | )
Net pension cost | $ | 1,845 |  | $ | 1,529 |  |  | $ | 5,524 |  | $ | 3,593 |

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2439-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2410-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=77993564&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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