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Income Taxes - Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Provision for Income Taxes at Statutory Rate (21% in 2018 and 35% in 2017 and 2016) | $ 16,701 | $ 20,179 | $ 15,592
Increases (Decreases) Resulting From: |  |  |
State income taxes, net of federal tax | 164 | 151 | 189
U.S. tax cost of foreign earnings | 1,215 | 761 | 192
Foreign tax rate differential | 3,158 | (3,747) | (3,921)
(Reversal of) provision for tax benefit reserves, net | (1,785) | 1,517 | (76)
Change in valuation allowance | 141 | (341) | (131)
Nondeductible expenses | 781 | 1,177 | 1,090
Research and development tax credits | (445) | (297) | (229)
Excess tax benefit related to stock-based compensation | (967) | (581) | (553)
Impact of the U.S. Tax Cuts and Jobs Act | (106) | 7,093 | 0
Other | (375) | 158 | (70)
Continuing Operations | $ 18,482 | $ 26,070 | $ 12,083

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