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Product Warranties - Current and Long Term Warranty (Details) - USD ($) $ in Thousands | Mar. 30, 2019 | Dec. 29, 2018 | Mar. 31, 2018 | Dec. 30, 2017
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Product Warranties Disclosures [Abstract] |  |  |  |
Current - in the next twelve months | $ 9,355 | $ 9,455 |  |
Long-term - beyond one year | 6,156 | 5,995 |  |
Total estimated settlements | $ 15,511 | $ 15,450 | $ 15,438 | $ 15,388

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