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Post-Retirement Health Care (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 29, 2018 | Sep. 30, 2017 | Sep. 29, 2018 | Sep. 30, 2017
Retirement Benefits [Abstract] |  |  |  |
Service cost | $ 213 | $ 185 | $ 639 | $ 556
Interest cost | 197 | 206 | 591 | 619
Amortization of net (gain) loss | 32 | 6 | 95 | 19
Net periodic post-retirement benefit cost | $ 442 | $ 397 | $ 1,325 | $ 1,194

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