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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
Allowance for doubtful accounts |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount | $ 2,206 | $ 1,535 | $ 2,116 | $ 1,698
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense | (1,021) | (486) | (251) |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction | 350 | 95 | 167 |
Allowance for sales returns and allowances |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount | 700 | 432 | 424 | $ 605
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense | (1,696) | (1,416) | (1,646) |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction | $ 1,428 | $ 1,408 | $ 1,827 |

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