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Acquisition - Pro Forma Information Adjustments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 29, 2018 | Sep. 30, 2017 | Sep. 29, 2018 | Sep. 30, 2017
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |  |
Net income | $ 56,060 | $ 40,004 | $ 179,264 | $ 95,047
Amortization |  |  |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |  |
Net income | 3,104 | (6,304) | 8,289 | (18,905)
Depreciation |  |  |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |  |
Net income | 0 | 139 | 0 | 417
Transaction costs |  |  |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |  |
Net income | 0 | 0 | 9,976 | (9,976)
Amortization of inventory step-up |  |  |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |  |
Net income | 0 | 0 | 36,927 | (36,927)
Stock compensation |  |  |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |  |
Net income | 421 | (426) | 5,110 | (6,206)
Interest expense |  |  |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |  |
Net income | 0 | (2,582) | 0 | (7,746)
Income tax impact of above items |  |  |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |  |
Net income | $ (1,011) | $ 2,906 | $ (14,290) | $ 25,802

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