Segment Information Segment Income or Loss Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended
Apr. 02, 2021	Mar. 27, 2020
Segment Reporting Information [Line Items]
Operating income (loss)	$ (3,844)	$ (18,049)
Unallocated Corporate Expenses	(58,989)	(54,787)
Stock-based compensation	(8,398)	(6,259)
Amortization of intangibles	(507)	(1,655)
Nonoperating Income (Expense)	(1,584)	(3,176)
Loss before income taxes	(5,428)	(21,225)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	5,068	(9,532)
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Unallocated Corporate Expenses	$ (7)	$ (603)

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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