Segment Information Segment Income or Loss Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 27, 2020	Mar. 29, 2019
Segment Reporting Information [Line Items]
Operating income (loss)	$ (18,049)	$ (8,408)
Unallocated Corporate Expenses	(54,787)	(50,257)
Stock-based compensation	(6,259)	(2,113)
Amortization of intangibles	(1,655)	(2,083)
Nonoperating Income (Expense)	(3,176)	(3,217)
Loss before income taxes	(21,225)	(11,625)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	(9,532)	(3,854)
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Unallocated Corporate Expenses	$ (603)	$ (358)

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

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