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Employee Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2018
Retirement Benefits [Abstract] |
Components of Net Periodic Benefit Costs | Components of net periodic benefit cost were as follows (in thousands):
| Three months ended |  | Nine months ended
| September 30, 2018 |  | September 24, 2017 |  | September 30, 2018 |  | September 24, 2017
Pension and SERPA Benefits |  |  |  |  |  |  |
Service cost | $ | 8,063 |  |  | $ | 7,896 |  |  | $ | 24,281 |  |  | $ | 23,688 |
Interest cost | 20,729 |  |  | 21,269 |  |  | 62,048 |  |  | 63,807 |
Expected return on plan assets | (36,925 | ) |  | (35,345 | ) |  | (110,742 | ) |  | (106,035 | )
Amortization of unrecognized: |  |  |  |  |  |  |
Prior service (credit) cost | (105 | ) |  | 256 |  |  | (316 | ) |  | 764 |
Net loss | 16,318 |  |  | 10,998 |  |  | 48,455 |  |  | 32,994 |
Curtailment loss | — |  |  | — |  |  | 1,018 |  |  | — |
Net periodic benefit cost | $ | 8,080 |  |  | $ | 5,074 |  |  | $ | 24,744 |  |  | $ | 15,218 |
Postretirement Healthcare Benefits |  |  |  |  |  |  |
Service cost | $ | 1,789 |  |  | $ | 1,875 |  |  | $ | 5,390 |  |  | $ | 5,625 |
Interest cost | 2,886 |  |  | 3,412 |  |  | 8,669 |  |  | 10,236 |
Expected return on plan assets | (3,541 | ) |  | (3,156 | ) |  | (10,623 | ) |  | (9,468 | )
Amortization of unrecognized: |  |  |  |  |  |  |
Prior service credit | (460 | ) |  | (543 | ) |  | (1,380 | ) |  | (1,629 | )
Net loss | 454 |  |  | 815 |  |  | 1,362 |  |  | 2,445 |
Net periodic benefit cost | $ | 1,128 |  |  | $ | 2,403 |  |  | $ | 3,418 |  |  | $ | 7,209 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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