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Post-Retirement Health Care (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Oct. 01, 2016 | Sep. 30, 2017 | Oct. 01, 2016
Retirement Benefits [Abstract] |  |  |  |
Service cost | $ 185 | $ 184 | $ 556 | $ 552
Interest cost | 206 | 212 | 619 | 634
Amortization of (gain)/loss | 6 | 16 | 19 | 46
Net periodic benefit cost | $ 397 | $ 412 | $ 1,194 | $ 1,232

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + 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)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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