Stockholders' Equity - Reclassified from AOCI (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jul. 04, 2020	Jun. 29, 2019	Jul. 04, 2020	Jun. 29, 2019
Amounts Reclassified from AOCI
Operating expenses	$ (119,242)	$ (112,493)	$ (244,461)	$ (223,275)
Income (loss) before income taxes	(1,442)	13,247	215	16,165
Income tax expense	381	29,276	(206)	26,796
Net income (loss)	(1,823)	(16,029)	421	(10,631)
Reclassifications From Accumulated Other Comprehensive Income (Loss)
Amounts Reclassified from AOCI
Income (loss) before income taxes	(161)	(194)	(201)	(431)
Income tax expense	(34)	(41)	(40)	(91)
Net income (loss)	(127)	(153)	(161)	(340)
Reclassifications From Accumulated Other Comprehensive Income (Loss) \| Gains on available-for-sales securities
Amounts Reclassified from AOCI
Interest income and other, net	121		222
Reclassifications From Accumulated Other Comprehensive Income (Loss) \| Losses on cash flow hedges
Amounts Reclassified from AOCI
Operating expenses	$ (282)	$ (194)	$ (423)	$ (431)

Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount after accretion (amortization) of discount (premium), and investment expense, of interest income and dividend income on nonoperating securities.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.

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