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Product Warranties - Current and Long Term Warranty (Details) - USD ($) $ in Thousands | Sep. 29, 2018 | Dec. 30, 2017 | Sep. 30, 2017 | Dec. 31, 2016
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Product Warranties Disclosures [Abstract] |  |  |  |
Current - in the next twelve months | $ 9,372 | $ 9,524 |  |
Long-term - beyond one year | 6,059 | 5,864 |  |
Total estimated settlements | $ 15,431 | $ 15,388 | $ 14,725 | $ 15,250

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