Segment Information Segment Income or Loss Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 28, 2019	Jun. 29, 2018	Jun. 28, 2019	Jun. 29, 2018
Segment Reporting Information [Line Items]
Operating Income (Loss)	$ (7,764)	$ 642	$ (16,172)	$ (8,685)
Unallocated Corporate Expenses	(51,692)	(50,961)	(101,949)	(107,471)
Stock-based compensation	(2,510)	(3,012)	(4,623)	(8,769)
Amortization of intangibles	(2,079)	(2,095)	(4,162)	(4,194)
Nonoperating Income (Expense)	(3,384)	(2,664)	(6,601)	(5,953)
Loss before income taxes	(11,148)	(2,022)	(22,773)	(14,638)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	(2,807)	6,495	(6,661)	6,866
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Unallocated Corporate Expenses	$ (368)	$ (746)	$ (726)	$ (2,588)

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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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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The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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