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Restructuring and Impairment Charges - Restructuring Costs Expensed (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 28, 2019 | Sep. 29, 2018 | Sep. 28, 2019 | Sep. 29, 2018
Realignment of Office Furniture Facilities and Exit of Business Line | Restructuring and impairment charges |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | $ 284 | $ 128 | $ 1,214 | $ 2,303

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