Segment Information Segment Income or Loss Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 29, 2019	Mar. 30, 2018
Segment Reporting Information [Line Items]
Operating Income (Loss)	$ (8,408)	$ (9,327)
Unallocated Corporate Expenses	(50,257)	(56,510)
Stock-based compensation	(2,113)	(5,757)
Amortization of intangibles	(2,083)	(2,099)
Nonoperating Income (Expense)	(3,217)	(3,289)
Loss before income taxes	(11,625)	(12,616)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	(3,854)	371
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Unallocated Corporate Expenses	$ (358)	$ (1,842)

The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives.

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